200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
1 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
00 TOP Sterun Boilers, Engines , Nozzles and Tur bines M echanical Engineering Multiple Choice Questions and Answers
List
Steam Boilers, Engines, Nozzles and Turbines Questions and Answers pdf
1.
For w a t e r ~ at pressures below atmospheric,
(a)
(b)
(c)
(d)
(e)
Ans:
melting
m elt ing
m elting
m elting
none of
a
point r ises slightly and boiling point drops markedly
point rises m arkedly and boiling point drops markedly
point drops slightly and boiling point drops markedly
pomt drops slightly and boiling poin t drops slightly
the above.
oo
k
s
2.
At very tow temperature, the melting and bolllno temperatures become equal. This temperature is
(a) 373°K
( b) 273.!6°1(
(c) 303•K
{d) o•K.
( e) 300•K.
Ans: b
The critical pressure at which Jatent heat of vaporisat1on is zero is
225 .65 kgf/cm 2
273 kgf/cm2
100 kgf/cm2
1 kgf/cm2
• 1 kgf/cm2.
a
4.
The latent heat of steam at pressures greater than at mospheric In comparison to latent heat at atmospheric pressure is
less
om
.c
fo
in
mo·re
le
equal
may be less or more depending on temperature
(e) unpredictable.
Ans: a
rs
(a)
( b)
(c)
/b
3.
(a)
{b)
(c)
(d)
(e)
Ans:
s:
//b
oi
(d)
The saturation temperat ure of steam with in crease In pressure lncreaS&s
linearly
r apidly ·first and t hen slowly
slowly first and then rapidly
inversely
non e of the abov e.
b
6.
Carbonlsatlon of coal is t he process of
pulverising coal in inert atmosphere
heating wood in a llmit4Mt supply of air at te m perat ures below 300°C
str ongly heating coal continuou sly for about 48 hours In the absence of air in a cl osed vessel
bincling the pulverised coal into brick-ettes
enriching carbon In the coal.
(a)
( b)
(c)
(d)
(e)
Ans:
7.
(a)
( b)
(c)
(d)
(e)
Ans:
ht
tp
5.
(a)
( b)
(c)
(d)
(e)
Ans:
c
Coke is produced by
pulverising coal in Inert atmosphere
hea ting wood in a limited supply of air at te mperatures below 300GC
strongly heating coa1 continuously for about 48 hours In the absence of air in a closed vessel
bincling the pulverised coal into brick- etts
enriching carbon in the coal.
c
09-Oct-15 2:35 AM3
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
2 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
8.
Heat ing of dry steam above saturation temperature is known as
(a) enthalpy
(b) superheating
(c) supersaturation
(d) latent heat
(e) super tempering .
Ans: b
9.
(a)
( b)
(c)
(d)
(e)
Ans:
Superheating of steam is done at
constant volume
constant temperatu re
constant pressure
constant entropy
constant enthaply.
c
10. 1 kg.m is equal to
(a) 9 .81 Joules
( b) All Joules
(c) 427 Joules
(d) 102 Joules
(e) 539 Joules.
Ans: a
11. If partial pressure of air and steam be pa andps respectively in a condenser, then according to Dalton's law, the
pressure in condenser is equal to
(a) Ps-Pa
(b) pa-ps
(C) Pa +P,
Ans: c
(b)
Equiva lent evaporation is the amount of water evaporated in a boiler from and at
o•c
1oo•c
(c) sat urat ion temperature at given pressure
(d) room temperature
(e) 2o•c.
Ans: b
The spedfic volume of steam w ith increase in pressure decreases
linearly
slow ly first and then rapidly
(c) rapidly first and then slowly
(d) inversely
(e) none of the above.
Ans: c
in
fo
.c
om
/b
13.
(a)
( b)
oo
ks
12.
(a)
The equivalent evaporation of a boiler is a measure to compare
the given boiler with the model
the two different boilers of t he same ma ke
two different makes of boi lers operat-,ing under the same operating conditions
two boilers of same make but opera ing under different conditions
any type of boilers operating under any conditions.
e
15.
The coal requirement per kW hour generation in the thermal power plant is of the order of
ht
(a) 0 . 1 to 0.2 kg
(b) 0 .2 to 0.4 kg
(c) 0.6 to 0 .8 kg
tp
s:
//b
oi
le
rs
14.
(a)
(b)
(c)
(d)
(e)
Ans:
(d) 1.0 to 1.5 kg
(e) 1.5 to 2 kg.
Ans: c
16.
(a)
( b)
(c)
(d)
(e)
Ans:
Sublimation region is the region where
solid and vapour phases are in equ i ~ librium
solid and liqu id phases are in equilibrium
liquid and vapour phases are i n equilibrium
solid, liquid and vapou r phases are in equili brium
none of the above.
a
17.
(a)
( b)
(c)
(d)
(e)
Ans:
Stoichiometric quantity of a ir is the
air present in atmosphere at NTP conditions
air required for complete combustion of fuel with no excess air
air r equired for optimum com bustion so as to have reasonable excess air
air r equired to convert CO into C02
air required to form an explosive mixture.
b
One kg of steam sample conta ins 0 .8 kg dry steam; it's dryness fraction is
0 .2
0.8
1.0
0.6
0 .5.
Ans: b
18.
(a)
( b)
(c)
(d)
(e)
19.
(a)
( b)
(c)
(d)
(e)
Ans:
If a steam sample is nearly in dry condition, t hen its dryness fraction can be most accurately determined by
throttling calorimeter
separat ing calorimeter
combined separating and throttl ing calorimeter
bucket calorimeter
none of the above.
a
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
3 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
20. If xx and x2 be the dryess fraction s obtained in separat ing calorimet er and t hrottling calorimeter respectively, t hen the
actual dryness fraction of steam will be
(a) xxx2
(b)x, + x2
Ans: a
21. The spedfic heat of superheated steam in kcal/kg i s generally of the order of
(a) 0.1
(b) 0.3
(c) 0.5
(d) 0.8
(e) 1.0.
Ans: c
22.
(a)
(b)
{c)
(d)
{e)
Ans:
On Mollier chart, flow th rough t urbine is represented by'
horizontal straight line
vertical straight line
straight inclined line
curved line
none of the above.
b
A wet vapour can be com pletely specified by
pressure only
tem perature only
dryness fraction only
specific volume only
pressure and dryn ess fraction .
e
24.
(a)
(b)
(c)
(d)
{e)
Ans:
On Mill ier chart1 the constant pressure lines
diverge from left to right
diver ge from right to left
are equally spaced t hroughout
first rise up and t hen fall
none of the above.
a
25.
{a)
{b)
(c)
(d)
(e)
Ans:
On Mollier chart, free expansion, or t hrottling process from high pressure to atmosphere is represen ted by
horizontal straight line
vertical straight line
straight inclined line
curved line
none of the above.
a
fo
26. The bitum inous coal is non-cak ing if its carbon content is
(a) 78-81%
(b) 8 1-85%
.c
om
/b
oo
ks
23.
(a)
{b)
(c)
(d)
{e)
Ans:
oi
le
rs
in
(C) 85- 90%
(d) 90- 95%
(e) 95-100%.
Ans: a
ht
tp
s:
//b
27. The dry saturated steam at very low pressure, (5- 10 kg/cm 2) w hen t hrottl ed to atmosphere w ill become
(a)
wet
(b)
superheated
(c) remain dry satruated
(d) dry
{e)
none of the above.
Ans: b
28. Water at pressure of 4 k g/cm2 and 1600C t emperat ure when exposed to atmosphere w ill
(a)
{b)
(c)
(d)
{e)
Ans:
boil
flash i.e. get converted into steam
remain as it was
cool down
none of the above.
b
29.
(a)
(b)
(c)
(d)
(e)
Ans:
The dry saturated steam at very high press.ure (150-200 kg/cm2) when throttled to atmosphere will become
wet
superheated
remain dry saturated
dry
none of the above.
a
30.
{a)
(b)
(c)
{d)
(e)
Ans:
In a throttling process
steam temperature r emaisn constant
steam pressure remains constant
steam enthalpy remains constant
steam entropy rema ins constant
steam volume remains constant.
c
3 1.
{a)
(b)
{c)
(d)
(e)
Ans:
In a throttling process
heat transfer takes place
work is done by t he expanding steam
internal energy of steam changes
all of the above
none of the above.
e
32 .
{a)
The pressure at which latent heat of vaporisation of water is zero, is
below atmospheric pr essure
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
4 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
(b) 1 kg/cm2
(c)
100 kg/cm2
(d) 170 k g/cm2
(e)
225 .6 kg/cm2.
Ans: e
33.
(a)
(b)
(c)
(d)
(e)
Ans:
latent heat of dry steam at atmospneric pr~ssure is equal to
539 kcal/kg
539 BTU/Ib
427 kcal/kg
100 kcal/kg
471 kcal/kg.
a
34. The latent heat of steam with ino-ease of pressure
(a) remains same
(b)
{c)
increases
decreases
(d)
(e)
behaves unpredictably
none of the above.
Ans: c
35.
(a)
(b)
(c)
(d)
{e)
Ans:
At critical point, i.e. p=225.65 kg/cm2, t he latent enthalpy o f vaporisation is
maximum
min imum
zero
depends on temperature also
none of the above.
c
ks
36. At w hich pressure the properties of water and steam become identical
(a) 0 . 1 kg/cm2
(b) 1 kg/cm2
(c) 100 kg/cm2
(d) 225.6 kg/cm2
(e) it is never possible.
Ans: d
le
rs
While steam expands in t urbines, theoretically t he entropy
remains constant
increases
decreases
behaves unpredictably
none of the above.
a
//b
oi
38.
(a)
(b)
(c)
(d)
(e)
Ans:
in
fo
.c
o
m
/b
oo
37. In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the
mass of steam passed out in same t ime was 4.8 kg. Dryness fraction is
(a)40%
(b) 25%
(c) SO%
(d) SO%
(e)90%.
Ans: d
ht
tp
s:
39 . Heating wet steam at constant temperat ure is heating it at constant
(a) volume
(b) pressure
(c) entropy
(d) enthalpy
(e) none of t he above.
Ans: b
40.
(a)
(b)
(c)
(d)
(e)
Ans:
Adiabatic process is
essentially an isentropic process
non-heat transfer process
reversi ble process
constant temperatu re process
constant enthalpy process.
b
41.
(a)
(b)
(c)
(d)
(e)
Ans:
The state of vapour under saturation condition is described by
pressure alone
temperature alone
pressure and temperatu re
pressure and dryness fraction
dryness fraction alone.
d
42.
(a)
(b)
(c)
(d)
(e)
Ans:
Pick up the wrong statement about critical condi tion of steam
latent heat is zero
liquid directly becomes steam
specific volume of steam and liquid is same
this i s the ma:ximum pressure li mit
all properties of liquid and steam are same.
d
43.
(a)
(b)
(c)
(d)
(e)
Ans:
Water boils when its vapour pressure
equals that of the surroundings
equals 760 mm of mercury
equals to atmospheric pressure
equals the pressure of water in t he conta iner
boiling has "nothing to do with vapour pressure.
a
45. Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
5 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
(a) 421 kgm
( b) 421 kgm
(c) 539 kgm
(d) 102 kgm
(e) 75 kgm .
Ans: a
46.
(a)
(b)
(c)
{d)
{e)
Ans:
Equiva lent evaporation of water is the evaporation "for a feed water supply at 100°C
and its corresponding conversion i nto dry sat urated steam at toooc and 1.033 kg/cm2
and its corresponding conversion i nto dry steam at desired boiler pressure
conversion i nto steam at atmospheric condition
conversion i nto steam at t he same pres-sure at which feed water is supplied
none of the above.
a
47.
(a)
{b)
(c)
(d)
(e)
Ans:
The evaporation of 15.653 kg of water per hour from and at toooc is called
equivalent evaporation
one boiler h.p .
boiler efficiency.
d
48.
(a)
(b)
(c)
(d)
(e)
Ans:
The increase in pressure
lowers the boiling point of a liqu id
raises the boiling point of a liquid
.does not affect the boiling point of a liquid
reduces its volume
none of the above.
b
49.
(a)
(b)
(c)
(d)
(e)
Ans:
During polytropic process
heat transfer takes place across cylinder walls
work is done
steam may be wet, dry or superheated after expansion
all of the above
none of the above.
d
50.
(a)
(b)
(c)
(d)
(e)
Ans:
Hygrometery deals with the
Hygroscopic substances
water vapour in air
temperature of air
pressure of air
density measurement.
b
51.
(a)
(b)
(c)
(d)
(e)
Ans:
Orsat meter is used for
gravimetric analysis of the flue gases
volumetr ic analysis of the flue gases
mass flow of t he flue gases
measuring smoke density of flue gases
none of the above.
b
52.
Alkaline pyrogaflate is used in Orsat's apparatus for absorption of
evaporative capacity
://
bo
ile
rs
in
fo
.c
o
m
/b
oo
ks
factor of evaporation
tp
s
(a) C02
ht
(b) CO
(c) 02
(d) N2
(e) none of t he above.
Ans: c
53.
(a)
(b)
(c)
(d)
(e)
Ans:
An ideal regenerative cycle is
equal to camot cycle
less than camot cycle
more than c.arnot cyde
could be anything
none of the above.
b
54.
(a)
(b)
(c)
(d)
(e)
Ans:
Efficiency of rankine cycle can be increased by
decreasing initial steam pressure and temperature
increasing exhaust pressure
decreasing exhaust pressure
increasing the expansion ratio
increasing number of regenerative heaters.
a
55.
(a)
(b)
(c)
(d)
(e)
Ans:
Cochran boiler is a
horizontal fire-tu be boiler
horizontal water-tube boiler
veritcal water -tube boiler
vertical fire tube boiler
forced circulating boiler.
d
56.
(a)
(b)
(c)
(d)
(e)
Ans:
Lancashire 'boiler is a
stationary fire t ube boiler
stationary water t ube boiler
water t ube boiler with natural/forced circulation
mobile fire t ube boiler
none of the above.
a
57.
Efficiency of a thermal cyde i ncreases by
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
6 of 18
(a)
( b)
(c)
(d)
( e)
Ans:
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
regeneration
reheating of steam
bot h (a) and (b)
cooling of steam
none of the above.
c
58. One kilowatt-hour energy is equiva lent to
(a) 1000 J
( b) 360 kl
(c) 3600 kl
(d) 3600 kW/sec
( e ) 1000 kl.
Ans: c
59. Which of t he following gases has t he highest calorific value
(a) producer gas
( b) coal gas.
(c) water gas
(d) blast furnace gas
(e) coke oven gas.
Ans: b
60. 100% efficiency of a t hermal cycle ca nnot be: achieved because of
(a) frtctionallosses
(b) it is not possible to achieve ooK temperature
(c) leakage
(d) non-availability of ideal substance
(e) none of the above.
Ans: b
6 1.
For burning 1 kg of carbon to CO as per che mically correct combusiton, amount of air required is
(a) 1 kg
(b) 4/ 3kg
(c) 8/3kg
(d) 2 kg
(e) 16/3 kg.
ok
62 .
s
Ans: b
The diameter of Cornish boiler is of t he order of
/b
o
(a) 1·2 m
(b) 1.5-2.5 m
(e) 0 .5 to 1 m .
Ans: a
s:
//b
oi
le
rs
in
63 . The lenght of Cornish boiler is of th e ord er of
(a) 2-4m
( b) 3·5 m
(c) 5-7.5 m
(d) 7-9 m
(e)9-11 m .
Ans: c
fo
.
co
m
(c) 2·3 m
(d) 2.5-3.5 m
ht
tp
64. The diameter of fire tube of Cornish boiler compared to its shell is
(a) one half
(b) one third
(c) one-fifth
(d) two-fifth
(e) t hree-fifth .
Ans: a
65. Stea m engine operates on
(a) camot cycle
(b) joule cycle
(c) Stirling cycle
(d) brayton cycle
(e) none of t he above.
Ans: d
66.
(a)
(b)
(c)
(d)
(e)
Ans:
The change in interna l energy in stea m engines equals to
wort< done duri ng the rankine cycle
work done duri ng compression.
wort< done duri ng adiabatic expansion
change in enthalpy
none of the above.
a
6 7.
(a)
(b)
(c)
(d)
( e)
Ans:
Water t ube boilers are those in which
flue gases pass t hrough t ubes and water around it
water passes through t he tubes and flue gases around it
wort< is done du ring adiabatic expansion
change in enthalpy
none of the above.
c
68.
(a)
( b)
(c)
(d)
( e)
Ans:
Locomotive type' boiler is
hortzontal multitubular water t ube boiler
water wa ll enclosed furnace type
vertical tubular fire tube type
hortzontal multi-tu bu lar fire t ube type
none of the above types.
d
69 .
Lancashire boiler is of
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
7 of 18
(a)
( b)
(c)
(d)
( e)
Ans:
stationary< fire tube -typ~
horizontal type
natural cirulation type
internally fired type
all of the above.
e
70.
(a)
( b)
(c)
(d)
( e)
Ans:
Fire tube boilers a re t hose in which
flue gases pass t hrough tub~ s and water a.round it
water passes t hrough t he t ubes and Rue gases around it
forced circulation ta kes place
tubes are laid vertica lly
none of the above.
a
7 1. Which of t he following substance will have
(a) ash
( b) volati le matter
(c) moisture
(d) hydrogen
(e) none of t he above.
Ans: a
sam~
percentage in both proximate and
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
ultimat~
analysis
72. The number of flue tu bes in Lancashire boiler is
(a) zero
(b) one
(c) two
(d) four
(e) many.
Ans: c
boil~r
bo i le ~r
/b
Which of t he following is a water tube
locomotive boiler
Cochran boiler
Cornish boiler
Babcock and Wilcox boiler
Lancashire boiler.
d
oo
ks
a
m
74.
(a)
(b)
(c)
(d)
(e)
Ans:
Which of t he following is a fire tube
locomotive boiler
Babcock and Wilcox boiler
Stirling boiler.
all of the above
none of the above.
o.
co
73.
(a)
(b)
(c)
(d)
(e)
Ans:
76.
s:
//b
oi
le
rs
in
f
75. The diameter of cylindrical shell of t he Lancashire boiler is of the order of
(a) 1 tp !.25m
( b) 1 to 1.75 m
(c)2to4m
(d) 1.75 to 2 .75 m
(e) 2.25 to 4.5 m .
Ans: d
A packaged boiler is one in which various parts li ke firing equipment, fans, feed pumps and automatic controls are
supplied by sa me man ufacturer loose and assembled at site
supplied m ounted on a single base
purchased from several parties and pa cked together at sit~
pack aged boiler does not exist
none of the above.
b
77.
The biggest size of therma l power unit operating in India is
(a)
(b)
(c)
(d)
(e)
ht
tp
(a)
(b)
(c)
(d)
(e)
Ans:
30 MW
60 MW
100 MW
210 MW
500 MW.
Ans: e
78.
Which of t he following coa ls has t he highest calorific v alue
anthracite coal
bituminous coal
lignite
peat
(e) wood .
Ans: a
(a)
(b)
(c)
(d)
79.
(a)
(b)
(c)
(d)
( e)
Ans:
The high pressure boiler is oiie producing steam at a pressure more than
atmospheric pressure
5 kg/cm2
10 kg/cm2
40 kg/cm2
75-80 kg/cm2 .
e
80.
(a)
( b)
(c)
(d)
( e)
Ans:
The crown of t he fire box is mad e hemispherical in ord er to
give maximum space
give max imum strength
withstand pressure inside boiler ,
resist intense heat in fire box
ena ble easy, ma nufactu re.
d
81.
Which of t he following is steam dbal
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
8 of 18
(a)
( b)
(c)
(d)
( e)
A ns:
non-coking bituminou s coal
brown coal
pulverised coal
coking bituminous coal
none of the above.
a
82.
(a)
( b)
(c)
(d)
( e)
A ns:
The fire tubes in, a Coarran and Scotish marine boiler are
horizontal
vertical
inclined
both horizontal and vertical
horizontal and inclined .
a
83.
The diameter of internal
(a) one-half
( b) one-third
(c) one-fourth
(d) one-fifth
(e) two-fifth.
flu~ t ub~s
in a
La ncashir~
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
boiler compared to its shell is
A ns: e
(a)
(b)
(c)
(d)
(e)
Ans:
on the
principl~
of
ks
Th~se operat ~
The best suited coa l for chain or travelling grate stoker boiler is
coking coa l
non coking or free burning coal
pulverised coal
high sulphur coal
least ash content coal.
b
oo
86.
O upl~x feed pumps are used in small steam boilers.
centrifugal pu mp
axial flow pump
gear pump
ejector pu mp
reciprocating pump.
e
/b
(a)
(b)
(c)
(d)
(e)
Ans:
om
85.
The basic purpose of drum in boiler is to
serve as storage of steam
serve as storage of feed water for water wall
remove salts from water
separate steam from water
control lev~ l.
d
.c
(a)
(b)
(c)
(d)
(e)
Ans:
fo
84.
87.
s:
//b
oi
le
rs
in
I n natura l circulat ion type boiler,
(a) heat ing takes place at bottom and the watE!!r supplied at bottom gets converted into the mixtur~ of steam bubbles and
hot water which rise to drum
(b) water is supplied in durm and through down-comers located in atmospheric conditon it passes to th~ water wall and
rises to drum in the form of mixture of water and steam
(c) feed pump is employed to supp l ~ ment natural drculation in wat er wall typ~ furnac~
(d) water is converted into steam in one . pass without any recirculation
( e) water is fed at atmospheric pressure.
A ns: a
88.
(d) 950-llOO•c
ht
( b) 5oo-6oo•c
(c) 700-850°C
tp
Hard coke is produced by carborisation of coal at
(a) atmospheric temperature
(e) 1200-1500°C.
A ns: d
89 .. Hard coke is used in
(a) cement industry
( b) therma l power plant
(c) blast fumace
(d) domestic use
(e) locomotives
Ans: c
90.
(a)
(b)
(c)
(d)
(e)
Ans:
Pick: up the correct statem~ nt a s regards Cornish boiler and
cornish is fire tube and lancashire is water tube
cornish i s water t ube and lanca sh ire is fire tube
cornish has two fire tubes and la ncashire has on~
lancashire has two fire t ubes and corni sh has one
both have two fire t ubes.
d
Lancashir~
boiler
9 1. I n locomotive boiler, maximum steam pressure is limited to
(a) 1 kg/cm2
(b) 5 kg/cm2
(c) 10 kg/cm2
(d) 18 kg/cm2
(e) 31 k g/cm2.
Ans: d
92 . Locomotive boiler is of the following type
(a) multitu bu lar
(b) horizontal
(c) internally fired
(d) mobi le
( e) all of t he above.
Ans: e
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
9 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
93. The shell diameter and length of locomotive boiler are
(a) 1.5 m, 4m
(b) 1.5 m, 6 m
(c) 1m, 4 m
(d)2m,4m
(e) 1.5 m, 8 m.
Ans: a
94.
(a)
( b)
(c)
(d)
Ans:
The diameters of fire tubes and su perheaer tubes in locomotive boiler are
47.5 m m, 130 mm
32.5 mm, 180 mm
65.5 mm, 210 mm
24.5 m m, 65 mm
a
95.
(a)
(b)
(c)
(d)
(e)
Ans:
The water tubes in a babcock and wilcox boiler are
horizontal
vertical
inclined
horizontal and inclined
vertical and inclined.
c
96.
(a)
(b)
(c)
(d)
(e)
Ans:
Which of t he following varieties of coals is mostly used in steam boilers
non-coking bituminou s coal
brown coal
peat
coking bituminous coal
none of the above.
e
97.
The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is
more
( b)
less
(c) same
(d) could be more or less depending on other factors
(e) none of the above.
Ans: a
98.
/b
oo
ks
(a)
A boi ler in India should conform to safety regulations of
(a) DIN
m
( b) BS
co
(c) ASTM
in
f
o.
(d) IBR
(e) GOST.
Ans: d
The function of injector used in small steam plants is to
create vacuum in Furnace
create vacuum at tu rbine exhaust
pump feed water
dose chemicals in feed water
contr ol steam temperature by injecting water.
c
100.
(a)
(b)
(c)
(d)
(e)
Ans:
Which of t he following boilers is best suited to meet fluctuating demands
babcock and wilcox
locomotive
lancashire
cochran
cornish.
b
101.
(a)
( b)
(c)
(e)
Ans:
The difference between cornish boiler and lancashi re boiler is that
former is fire t ube type and latter is water tube type boiler
former is water tube type and latter is fire tube type
former contains one fire tu be and latter contains two fire tubes
none/of the above.
c
ht
tp
s:
//b
oi
le
rs
99.
(a)
(b)
(c)
(d)
(e)
Ans:
102. I n accelerated circulation type boiler
(a) heating takes place at bottom and t he water supplied at bottom gets converted into the mixture of stdam bubbles and
hot water which rise to durm
( b) water is supplied in drum and through downcomers" located in atmospheric conditon it passes to the water wall and
rises to dunn in the from of mixture of water and steam
(c) feed pump is employed to su pplement natural drculat ion i n wat er wall type furnace
(e)
water is converted into steam in one pass without any recirculation
(e)
water is fed under high pressure and high velocity .
Ans: b
103.
(a)
(b)
(c)
(d)
(e)
Ans:
Pick up the wrong statement about water t u be boiler in comparison to fire tube boilers
former generates steam at high pressure
former occupies less space for same power
r ate of steam flow is more in former case
former is used for high installed capacity
chances of explosion are less in former case.
e
104. The number of drums in Benson steam generator is
(a)
one
(b)
(c)
(d)
(e)
Ans:
two
one steam drum and one water drum
no drum
none of the above.
d
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
10 of 18
105.
(a)
(b)
(c)
(d)
( e)
Ans:
c
106.
(a)
( b)
(c)
(d)
( e)
Ans:
The fusible plug in sm all boilers is located
in the drum
in the fire tubes
above steam dome
over the combustion chamber
at the inlet of chimney.
d
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
A fusible plug is fitted in small boilers in ord er to
avoid excessive build up of pressure
avoid explosion
extinguish fire if water level in th e boiler falls below alarming li mit
control steam dom e
remove molten aslj.
107. Fusible plug for boilers is made of fu sible meta l containing tin, lead, and
(a) bismuth
( b) copper
(c) alumi nium
(d) nickel
( e) iron .
Ans: a
108.
(a)
( b)
(c)
(d)
( e)
Ans:
Boiler H.P. is defined as t he
steam evaporation rate per kg of fuel fired
wort< done in evaporat ing 1 kg of steam per hour from and at 100°C into dry saturated steam
the evaporation of 15.65 kg of water per hour from and at 100oc into dry saturated steam
wort< done by 1 kg of steam at saturation condition
heat consumed in evaporating 1 kg water .at 0°C to steam at 100°C and 1.033 kg/em pressu re.
c
/b
oo
k
s
109. I n forced recircu lation type boiler,
(a) heat ing takes place at bottom and t he water supplied at bottom g ets converted into the mixture of steam bubbles and
h ot water which rise to drum
(b) water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and
rises to drum in the form of mixture of water and steam
(c) feed pump is employed to su pplement natural circulation i n water wall t ype furnace
(d) water is converted into steam in one pass without any recirculation
( e) heat ing of water takes place in stages.
Ans: c
The ratio of heat utilised to produce steam and t he heat liberated in furnace is known as
boiler effectiveness
boiler evaporative capacity
factor of evaporation
equivalent evaporation
boiler efficiency.
111 .
(a)
(b)
(c)
(d)
( e)
Ans:
Steam in water t ube boiler as compared to fire tube boiler
can be ra ised ra pidly
is raisd at slower r ate
is raised at same rate
could be r aised at fast/slow rate depending on d esign
none of the above is true.
a
nf
o.
co
m
110.
(a)
( b)
(c)
(d)
(e)
tp
s:
//b
oi
le
rs
i
Ans: e
ht
112 . Thermal efficiency of well mainta ined boiler will be of the order
(a) 20%
( b) 40%
(c) SO%
(d) 75%
( e) 90% .
Ans: e
113 . Thermal efficiency of a t hermal power plant is of the order of
(a) 15%
( b ) 20%
(c) 30%
(d) 45%
( e ) 60% .
Ans: c
114.
(a)
( b)
(c)
(d)
(e)
Ans:
It is required to produce large amount of steam at low pressure. Wh ich boiler should be used?
pulve rised fuel fired boiler
cochran boiler
lancashire boiler
babcock and wi lcox boiler
stoker fired boiler.
c
115.
(a)
(b)
(c)
(d)
(e)
Ans:
The overall efficiency of t herma l power plant is
boiler efficiency, t urhine efficiecny, generat-or efficiency
all t he t hree above plus gas cycle efficiency
carnot cyde efficiency
regenerative cycle efficiency
r ankine cycle efficiency.
a
116.
(a)
( b)
(c)
(d)
Which type of boiler c.an m eet r apid changes of load
vertical fire tube type
horizontal fire t ube type
horizontal water tube type
vertical water t ube type
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
11 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
(e) forced circulation type.
Ans: e
117. I n forced ci rculation type boiler
(a) heat ing takes place at bottom and t he water supplied at bottom g ets converted into the mixture of steam bubbles and
h ot water which rise to drum
( b) water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and
rises t o drum in the form of mixture of water and steam
(c) feed pump is employed to su pplement natural circulation i n wat er wall type furnace
(d) water is converted into steam in one pass without any recirculation
( e) water is heated in a large n umber of t ubes.
Ans: d
118.
(a)
( b)
(c)
(d)
( e)
Ans:
Boiler stays are used to
prevent flat su rfaces under pres.sure from tearing apart
take care of failure in shear
take care of failure in compression
provide support for boiler
provide foundation of boiler.
a
119. The radius of a dish ed head is taken approximately as
(a) one -fourth
( b) half
(c) one
(d) two
( e) t hree.
Ans: c
Size of boiler tubes is specified by
mean diameter and t hicknes.s
inside diameter and thickness
outside dia meter and thickness
outside dia meter and inside diameter
outside dia meter alone.
c
121.
(a)
( b)
(c)
(d)
( e)
Ans:
The heat loss in a boiler takes place in t he form of
heat carried away by Hue gases
heat car ried away by ash
moisture present in fuel and steam formed by combustion of hydrogen in fuel
radiation
all of the above.
e
om
/b
oo
ks
120.
(a)
( b)
(c)
(d)
( e)
Ans:
oi
le
rs
in
fo
.c
122. The major axis of elliptical manholes on t he shell should be provided
(a) longitudinally
( b) circumferentially
(c) on di shed end
(d) anywhere
( e) vertically.
Ans: b
I n w hich of the following boilers, t he draught in furnace is increased by utilising exhaust steam from engine
lancashire boiler
locomotive boiler
babcock and wi lcox boiler
cochran boiler
benson boiler.
b
124.
(a)
( b)
(c)
(d)
( e)
Ans:
With increase in load, radia nt superheater has
drooping characterist ic
lihear characterisstic
rising characteristic
flat characteristic
none of the above.
a
125.
(a)
( b)
(c)
(d)
(c)
Ans:
With increase in load, convection superheater has
drooping characterist ic
linear characterisstic
rising characteristic
flat characteristic
none of the above.
c
ht
tp
s
://
b
123.
(a)
( b)
(c)
(d)
( e)
Ans:
126. The diameter of fire tubes in Cochran boiler is of the ord er of
(a) 2 em
( b) 6Cm,
(C) 8 em
(d) 12 em
( e ) 15 em.
Ans: b
127.
(a)
( b)
(c)
(d)
( e)
Ans:
I n a r ecuperative air preheater, t he heat is tra nsferred
from a meta l wall from one mediu m to another
from heating an itermediate material a nd t h en heating the air from this material
by direct mixing
heat is t ra nsferred by bleeding some gases from furnace
none of the above.
a
128. A safety valve in a locomotive starts lea king. The leak ing medium will be
(a) water
( b) dry stea m
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
12 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
(c) wet steam
( d) super heated steam
(e) su persaturated stea m .
Ans: d
129. The temperature of flue gases at air heater outlet should be
(a)
1oo•c
above dew-point temperature of flue gases
below d ew-point temperature of flue gases
less tha n wet bulb temperature of flue gases
above wet bulb temperature of flue gases.
b
130.
(a)
(b)
(c)
(d)
(e)
Ans:
I n r egene rative air preheater, the heat is transferred
from a meta l wall from one mediu m to another
from heating an intermediatea naterial a nd then heating t he air from this material
by direct mixing
heat is t ra nsferred by bleeding some gas frQm furnace
none of the above.
b
131.
(a)
(b)
(c)
(d)
(e)
Ans:
I n designing air preheater, t he importa nt design consideration is that
approach temperature should be as low as possible
handling and maintenance should be easier
heat transfer a rea should be optimum
stack gases should not be cooled to t he dew point
none of the above.
d
132.
(a)
(b)
(c)
(d)
( e)
Ans:
The pressure of reheat steam after passing through reheater compared to inlet condition is
more
less
equa l
may be more or less depending on capacity of reheater
none of the above.
b
133.
(a)
( b)
(c)
(d)
( e)
Ans:
The function of injector used in small capacity boilers is to
create vacuum
inject chemic.al solution in feed pump
pump w ate r~ similar to boiler feed pump
add m ake up water in t he system
none of the above.
c
.c
om
/b
oo
ks
( b)
(c)
(d)
(e)
Ans:
tp
s:
//
The height of chimney in a power plant is governed by
the draft to be created
limitation of construction facilities
contr ol of pollution
quantity of flue gases to be ha ndled
all of the above.
c
ht
135.
(a)
(b)
(c)
(d)
(e)
Ans:
bo
i
le
rs
in
fo
134. The safety valve at superheater as compared to drum safety valve setting is set at
(a) higher value
( b) lower value
(c) same value
(d) a ny value
(e) none of t he above.
Ans: b
136. Steam exhaust from high pressure turbine is reheated in
(a) boiler drum
(b) superheater tubes
(c) economiser
(d) a separate coil
( e) a separate coil located in convection path.
Ans: e
137.
(a)
( b)
(c)
(d)
( e)
Ans:
Vacuum for reciprocating steam engines co mpared to steam turbines is
more
equal
less
could be more or less depending on t he size of plant
none of the above.
c
138. Expa nding steam to a very low prseeure (high vacuum) in steam engines is
(a) desirable
( b) economical
(c) essential
(d) optiona l
( e) uneconomical .
Ans: e
139.
(a)
( b)
(c)
(d)
( e)
Ans:
I n locomotives, the draught is produced by
chimney
induced draft fan
both combined (a) and (b)
steam j et draught
none of the above.
d
140. Reheating of steam under ideal conditions ta kes place at constant
(a) entropy
( b) enthaply
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
13 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
(c) pressure
( d) temperat ure
(e) all of the above.
Ans: d
141.
(a)
( b)
(c)
(d)
(e)
Ans:
The m aximum discha rg ~ t hrough a chimn~y occurs when th~ height of
infinitely long
around 200 meters
equa l to t he height of t he hot gas column producing draught
outside temperat ure is very low
more than the tallest building nea rby.
c
142.
(a)
(b)
(c)
(d)
(e)
Ans:
Proximate analysis of fue l is determination o f percentage of
carbon, hydrogen, nitrogen, sul ph ur, moisture
fixed carbon, ash, volatile matter, moisture
higher calorific value
lower calorific value
rough analysis.
b
143.
(a)
(b)
(c)
(d)
(e)
Ans:
Which device is used in t hennal power plants to reduce level of pollution
induced draft fan
smoke meter
chimney
precipitator
pulveriser.
d
144.
(a)
(b)
(c)
(d)
( e)
Ans:
Bomb calori meter is used to d etermine
Higher calorific value at constant v olume
Lower calorific value at constant volum~,
Higher calorific value at constant pressure
Lower calorific valu~ at constant pr~ssure
None of the above.
a
145.
(a)
( b)
(c)
(b)
( e)
Ans:
Ultimate ana lysis of fuel is d etermination of percentage of
carbon, hydrogen, n itrog~n, sul ph ur, moisture
fixed carbon, ash, volat ile matter, moisture
higher calorific value
lower calorific value
best a nalysis.
a
146.
(a)
( b)
(c)
(d)
(e)
Ans:
For combut:sion of a fuel, following is es.sential
correct fuel air ratio
proper ignition temperature
02 to support combustion
all t he t hree above
none of the above.
d
is
oi
le
rs
in
fo
.c
o
m
/b
o
ok
s
chimn~y
ht
tp
s:
//b
147. Spontaneous combustion is a phenomenon i n which
(a) all t he fuel burns instantaneously producing high energy release
(b) fuel burns with less air
(c) coa l bursts into flame without any external ignition source but by itself d ue to gradual increase in temperature as a
r esult of heat r eleased by combination of oxygen w ith coal
(d) explosion in furnace
( e) none of the above.
Ans: c
148.
(a)
( b)
(c)
(d)
( e)
Ans:
The economiser is used in boilers to
increase t hermal efficiency of boil~r
economise on fuel
extract heat from th~ exhaust flue gases
increase flue gas temperature
to heat feed water by bled steam.
a
149.
(a)
( b)
(c)
(d)
(e)
Ans:
An economiser in a boiler
increases steam pressure
increases steam flow
decr eases fuel consumption
decr eases steam pressure
increases l ife of boiler.
c
150. 02 content in atmospheric air on
volum~
basis is
(a) 21%
(b) 23%
(d) 30%
(d) 40%
(e) 70%.
Ans: a
151. 02 content in atmospheric air on weight basis is
(a) 21%
(b) 23%
(c) 30%
(d) 40%
(e) 70%.
Ans: b
152. Primary air is t he a ir used to
(a) provide a ir around burners for obtaining optimum combustion
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
14 of 18
(b)
{c)
(d)
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
transport and dry the coal
convert CO (formed in lower zone of furnace) into C02 at higher zone
air-delivered by forced draft fan
(e) none ot t he above.
Ans: b
153.
{a)
(b)
(c)
(d)
{ e)
Ans:
Sulphur content of fuels is very im portant t-o t he plant operators because it
has high heating value
retards electr ic precipitation
promotes complete combustion
has highly corrosive effect
facilitates ash removal.
d
154.
(a)
(b)
{c)
(d)
( e)
Ans:
Presence of moisture in fuel oi l would
keep t he burner ti ps cool
aid in proper combustion
cause sputtering, possibly extinguish-,ing flame
clean the nozzl es
reduce flame length .
c
155.
(a)
( b)
(c)
(d)
{ e)
A ns:
Gusset stays in a boiler are provided to
prevent the bulging of flat surfaces
avoid explosion in furnace
prevent lea kage of hot flue gases
support furnace freely from top
prevent atmospheric a ir lea king into furnac~ .
a
156. Water and sediment in fuel oil can be removed by
heat ing the oil in t he settling tanks
cooling t he oil in the settling tanks
burning the oil
suspension
filtering .
a
ks
{a)
{ b)
{c)
{d)
( e)
A ns:
fo
158. Secondary air i s the used to
le
rs
in
provide a ir around burners for obta ining optimum combustion
transport and dry the coal
convert CO (formed in lower zone of furnat>!) into C02 at higher zone
air d elive red by induced draft fan
air fed to pulverisers .
a
oi
{a)
(b)
(c)
{d)
{ e)
A ns:
/b
.c
om
lowest temperature at which oil will flow under set condition
storage temperatu re
temperature at w hich fuel is pumped through burners
temperature at w hich oil is transported
none of the above.
a
oo
157. Pour point of fuel oil is t he
{a)
{ b)
{c)
{d)
{e)
A ns:
//b
159 . The behaviou r of coal in a furnace is determained by
tp
s:
the content of sulphur
the content of ash and heating v alue
the pro>cimate a nalysis
the e>cact analysis
itstype .
c
ht
{a)
{ b)
{c)
{d)
( e)
A ns:
160. Pick up wrong statement about desired properties of a good fuel
{a)
{ b)
{c)
(d)
{ e)
A ns:
high calorific value
produce m inimum smoke and gases
ease in storing
high ignition point
ecomomica l
d
161. Sulphur in coal results in
{a)
{ b)
{c)
{d)
(e)
A ns:
causing cli nkering and stagging
corroding air heaters
spontaneous combustion during coal storage
facilitating ash predpitation
all of t he above.
e
162. Cak ing coals are those w hich
{a)
(b)
{c)
(d)
(e)
Ans:
form l umps or masses of coke
burn freely
show little or no fusing action
burn completely
do not form ash.
a
163. Green coal, in order to be
(a)
(b)
{c)
(d)
{e)
Ans:
burn t~
must be
heated sufficiently
burnt in excess air
heated to its ignition point
burnt as powder
burnt as lumps.
c
164. The ultimate analysis of fuel lists
{a) various chemic.al constituents, carbon,
hydrogen~
oxygen etc, plus ash as per-cents by volume
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
15 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
(b)
{c)
{d)
{e)
Ans:
various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
fuel constituents as percents by v olume of moisture, volatile, fixed carbon and ash
fuel constituents a s percents by weight of m oisture, volatile, fixed carbon and ash
moisture and ash free heating val ue.
b
165.
{a)
(b)
{c)
{d)
{ e)
Ans:
The proximate analysis of fuel lists
various chemic.al constituents, carbon, hydrogen, oxygen etc, plus ash as per- cents by volume
va rious chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
fuel constituents as percents by v olume of moisture, volatile, fixed carbon and ash
fuel constituents a s percents by weight of m oisture, volatile, fixed carbon and ash
m oisture and ash free heat ing val ue.
d
166.
{a)
(b)
{c)
{d)
{ e)
Ans:
Tertiary air is the air used to
provide a ir around burners for obta ining optimum combustion
transport and dry the coal
cool the sc.anners
supply air for ignitors
convert CO {formed in lower zone of furnace) into C02 at higher zone.
e
167. The safety valve on boiler drum com pared to safety v alve on superheater i s set at
{a) same value
( b) higher value
{c) lower value
{d) lower/higher depending on steam flow
( e) unpredicatble.
Ans: b
Which is not correct statement about pul ve ~rised fuel firing
high burning rate is possible
heat release can be easily controlled
fuel burns economically
it is the best technique for burning high ash content fuel having low fusion ash
separate mills are required to powder t he ooal.
d
169.
{a)
{ b)
{c)
{d)
{e)
Ans:
The t hree "Ts"' for good combust ion are
temperature, t ime, a nd turbulance
total air, t rue fuel, and t urbulance
thorough mixing, total air, and temperature
total air, t ime, a nd temperature
none of the above.
a
170.
{a)
(b)
(c)
{d)
{ e)
Ans:
Which is not correct statement about t he funct ion of furnace
to provide proper conditions for con-tinuous complete combustion
mix fuel with ai r and ignite
separate ash from coal
maintain heat supply to prepare and ignite the incoming fuel
to minimise radiation losses.
c
171.
{a)
{ b)
{c)
{d)
{ e)
Ans:
Which is not correct statement about effect of sulphur in f uel
it has heating value
it helps in elect rostatic precipitation of ash i n flue-gases
it leads to corrosion of air heaters, ducting, etc. if flue gas exit tem perature is low
it erodes furnace walls
none of the above.
d
ht
tp
s:
//b
oi
le
rs
in
fo
.c
om
/b
oo
ks
168.
{a)
{ b)
{c)
{d)
{ e)
Ans:
172. Heating va lue of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be
multiplied by the follow ing factor to correct for as fired val ue
(a) ( 1- m oist ure content)
(b) ( 1 +moisture content)
{c)
1 + moist ure content
{d)
1 - moisture content
Ans: a
173.
{a)
{ b)
{c)
{d)
(e)
Ans:
Ga rdually increasi ng temperat ure of flue gases at inlet to chimney for given steam outputs is an indication of
higher effectiveness of boiler
high calorific value coal being burnt
fouling of heat t ransfer surfaces
raising of steam temperature
lea kage of air.
c
174.
{a)
(b)
{c)
{d)
{e)
Ans:
I ncomplete combustion c.an be best j udged by
smoky chimney exit
excess air in flue gases
measuring carbon mono-oxide in flue gases
measuring temperat ure of flue gases at exit of furnace
measuring oxygen in fl ue gases.
c
175. The capacity of induced draft fan compared to forced draft fan in a boiler is
(a) same
(b) more
(c) less
{d) less or more depending on size of boiler
(e) unpredictable.
Ans: b
176. Pu lverised fuel is used for
{a) better burning
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
16 of 18
(b)
{c)
{d)
{e)
Ans:
more calorific value
less radiation loss
medium sized units
stoker fired boilers.
a
177.
(a)
(b)
(c)
(d)
(e)
Ans:
Calorific value of coal is of the order of
200-400 kcal/kg
800-1200 kcal/kg
2000-4000 kcal/kg
5000-8000 kcal/ kg
8000-10,000 kcal/kg.
c
178.
(a)
(b)
(c)
(d)
{e)
Ans:
Eva porat ive c.apacity of boiler is expres.sed as
kg of steam produced
steam pressure produced
kg of fuel fired
kg of steam produced per kg of fuel fifed
kg of water evaporated.
d
179.
{a)
{b)
{c)
Boiler parameters are expressed by
tonnesjhr. of steam
pressure of steam i n kg/cm2
temperature of steam in oc
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
(d) all of the above
{e) none of the above.
Ans: d
180. The condition of steam in boiler drum is always
(a) dry
ok
s
(b) wet
{c) saturated
{d) supersat urated
(e) su perheated .
Ans: b
.c
om
/b
o
181. The balanced draft furnace is one using
{a) induced draft fan and chimney
(b) induced draft fan and forced draft fan
{c) forced draft fan and chimney
(d) any one of the above
{e) none of the above.
Ans: b
In ordetjo obtain superheated steam, a superheater i s added in an existing boiler. As as result, furnace vacuum will
remain unaffected
improve
(c) worsen
may improve/worsen depending on size
unpredictable.
c
183.
{a)
(b)
{c)
(d)
{e)
Ans:
Maximum energy loss in a boiler occurs due to
unburnt c.arbon in ash
incomplete combustion
ash content
Hue gases
radiation losses.
d
184.
{a)
(b)
{c)
(d)
{e)
Ans:
Overfire burning is t he phenomenon of
supply of excess, air
supply of excess coal
burning CO and unbumts in upper zone of f urnace by supplying more air
fuel bed firing
none of the above.
c
185.
{a)
{b)
{c)
{d)
{e)
Ans:
Which is not the correct statement about moisture in coal
inherent moisture and surface mois-,ture are different things
in some coals moisture may be present upto 40%
some m oisture i n coal helps in better burning which is not possible with completely dry coal
it increases t hermal efficiency
moisture i n coal is removed before firing by heating it with hot air.
d
186.
{a)
{b)
{c)
(d)
(e)
Ans:
Oeaeration of feed water is carried out because it reduces
cavitation of .boiler feed pu mps
corrosion caused by oxygen
heat transfer coefficient
pH value of water
weight of water to be handled.
b
187.
(a)
(b)
(c)
(d)
(e)
Ans:
A supercritical boiler is one t hat operates above t he pressure and temperature o f following values
100 k g/cm2 and 540°C
1 kg/cm2 and 1oo•c
218 k g/cm2 abs and 373°C
218 kg/cm2 abs and 540°C
ht
tp
s:
//b
oi
le
rs
in
fo
182.
{a)
(b)
(d)
(e)
Ans:
c
100 kg/cm2 abs and 373°C
188. Natural water circulation, by convect ion i n water tube boilers, w ith increase in pressure of boiler
{a)
increases
(b)
decreases
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
17 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
remains unaffe-cte-d
first increases and t hen decreases
first decreases and then increases.
b
189.
(a)
( b)
(c)
(d)
(e)
Ans:
The steam temperature with increase in load in case of a boiler fitted with radiation superheater
increases
decreases
remains unaffe-cte-d
first increases and t hen decreases
unpredictable.
b
190.
(a)
(b)
(c)
(d)
(e)
Ans:
During storage, the he-ating value- of coal
increases
decreases
remains constant
may increase or decrease depending upon t he met hod of storage
none of the above.
b
191.
(a)
(b)
(c)
(d)
(e)
Ans:
The r elative heat absorption for successively added equal areas of boiler convection heating surfaces
increases
decreases
remains unaffected
first increases and t hen decreases
first decreases and then increases.
b
192.
(a)
(b)
(c)
(d)
( e)
Ans:
Film boling occurs at
very low pressure
atmospheric pressures
medium pressu res
very high pressures
none of the above.
d
/b
oo
ks
(c)
(d)
(e)
Ans:
le
rs
in
For the same diameter a nd thickness of t ube, a water t ube boiler compared to a fire tube boiler has
more heating surfaceless heating surface
equa l heating surface
heating surface depends on other parameters
none of the above.
a
//b
oi
194.
(a)
( b)
(c)
(d)
(e)
Ans:
fo
.c
om
193. Fire tube boilers a re lim ited to a maximum design working pressure of
(a) 1 kg/em
( b) 6 kg/em
(c) 17 kg/cm 2
(d) 100 kg/cm2
( e) 250 kg/cm2 .
Ans: c
ht
tp
s:
195. I n water wall furnace, t he heat is tran sferred to the water-walls by
(a) convection
(b) r adiation
(c) conduction
(d) radiation and conducton
(e) radiation and convection.
Ans: b
196. Relative percentage of heat absorbed t hrough the heat transfer of
( i) furnace water wall,
( ii) boiler bank,
( Hi) superheaters
( iv) economiser,
(v) airheater of a typical boiler of 200 MW capacity would be of the o rder of
(a) 48:20:15:7:10
(b) 10:7:15:20:48
(c) 20 :48: 7 :1 5:10
(d) 7 :15: 20:10:48
( e) 48:15:10:7:20.
Ans: a
197.
(a)
(b)
(c)
(d)
( e)
Ans:
The feed check valve is used in order to
regulate flow of boiler water
check level of water in boiler drum
reci rculate unwanted feed water
allow high pressure fee-d water to flow to drum and not a llow reverse flow to take place
none of the above.
d
198. The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow r atings)
i ncrease
(a) increases
(b) decreases
(c) remains uncha nged
(d) increases/decreases depending on stea m temperature requirements
(e) unpredictable.
Ans: b
199.
(a)
(b)
(c)
(d)
Feed water conditioning in t herma l power p lants in done to
reduce hardness and for remov al of solids
increase efficiency- of t hermal power plant
increase *heat tr ansfer rate
increase steam param eters
09-Oct-15 2:35 AM
200 TOP Steam Boilers, Engines, Nozzles and Turbines - Mechanical En...
18 of 18
http://engineeringmcqs.blogspot.com/2014/08/200-top-steam-boilers-eng...
co
m
/b
oo
ks
(e) all of the above.
Ans: a
ht
tp
s:
//b
oi
le
r
si
nf
o.
200. The basic j ob of feed water treatment in bo ilers is to overcome the problem of
( a) corrosion
(b) scale
{ c) carryover
( d ) embrittlement
(e) all of the above.
Ans: e
<D
NutriFresh Services- HPP
The Tri-State's premier HPP and Cold Press juice copacking facility
G•l +1 Recommend this on Goc9e
Labels: engines, Noules and TUrbines ObjectiVe Question s, Steam Sollers
No comments:
Post a Comment
Enter your comment...
Comment as:
Select profile...
Preview
Newer Post
Older Post
Home
Subscribe to: Post Comments (Atom)
Electrical Engineering Multiple Choice Questions and Answers
Here you can find objective type Electrical En gineering questions and answers for interview and entrance examination. Electrical Engineeri ...
Mechanical Engineering Multiple Choice Questions and Answers list
Mechanical Engineering questions and answers with explanation for i nterview, competitive examination and entrance test. Fully solved exampl ...
152 TOP Thermodynamics- Mechanical Engineering Multiple choice Questions and Answers List
Thermodynamics Questions and Answers pdf free down load 1. Which of the following variables controls the physical properties of a perfect..
135 TOP Transformers- Electrical Engineering Multi ple Choice Questions and Answers
Latest Transformers Interview Questions and Answe rs List 1. Which of the following does not change in a t ransformer? {a) Current ( b •..
118 TOP Current Electricity - Electrical Engineering Multiple Choice Questions and Answers
latest Current Electr icity Questions and Answers list 1. The 5.1. unit of power is (a) Henry (b) coulomb ( c) watt ( d) watt-hour A ..
250 TOP I. C. Engi nes - Mechanical Engineering Multiple choice Questions and Answers Ust
I. C. Engines Questions and An swers pdf free download 1. The working cycle in case of four s-troke engine is completed in following number...
109 TOP Measurement and Instrumentation - Electrical Engineering Multiple choice Questions and Answers
latest Measurement and Instrumentation Questions and Answers List 1. The use of _ _ instruments is merely confined within laboratories .
102 TOP Transmission and Distribution - Electrical Engineering Multi ple Choice Questions and Answers
Latest Transmission and Distribution Questions and An swers U st 1. By which of the following systems electric power may be transmitted ? .•.
Civil Engi neering Questions and Answers
Civil Engi neering questions and answers with explanation for interview, competiti ve examination and entrance test. Fully solved examples wi..
103 TOP Heat Tr ansfer - Mechanical Engineering Multiple Choice Questions and Answers List
Latest Heat Tr ansfer Questions and Answers pdf free download 1. Unit of thermal conductivity in M.K.S. units is ( a) kcal/kg m2 °C {b) kc •. •
Powered by Blogger.
09-Oct-15 2:35 AM
100 TOP MOST POWER PLANT Engineering Multiple Choice Questio...
1 of 11
http://engineeringinterviewquestions.com/power-plant-engineering-multi...
Engineering Interview Questions.com
Engineering interview questions,multiple choice questions,objective type questions,seminor topics,lab viva questions and answers pdf free download for freshers.
Home » POWER PLANT Engineering Questions and Answers » 100 TOP MOST POWER PLANT Engineering Multiple Choice Questions and Answers
100 TOP MOST POWER PLANT Engineering Multiple Choice Questions and Answers
21. In a regenerative feed heating cycle, the greatest economy is affected
(a) when steam is extracted from only one suitable point of steam turbine
(b) when steam is extracted from several places in different stages of steam turbine
(c) when steam is extracted only from the last stage of steam turbine
(d) when steam is extracted only from the first stage of steam turbine
Ans: b
22. The maximum percentage gain in Regenerative feed heating cycle thermal efficiency
(a) increases with number of feed heaters increasing
(b) decreases with number of feed heaters increasing
(c) remains same unaffected by number of feed heaters
(d) none of the above
oo
ks
Ans: a
23. In regenerative cycle feed water is heated by
/b
(a) exhaust gases
m
(b) heaters
co
(c) draining steam from the turbine
o.
(d) all above
rs
i
nf
Ans: c
24. Reheat cycle in steam power plant is used to
le
(a) utilise heat of flue gases
//b
oi
(b) increase thermal efficiency
(c) improve condenser performance
tp
Ans: b
s:
(d) reduce loss of heat
ht
25. Mercury is a choice with steam in binary vapour cycle because it has
(a) higher critical temperature and pressure
(b) higher saturation temperature than other fluids
(c) relatively low vapourisation pressure
(d) all above
Ans: d
26. Binary’vapour cycles are used to
(a) increase the performance of the condenser
(b) increase the efficiency of the plant
(c) increase efficiency of the turbine
Ans: b
27. A steam power station requires space
(a) equal to diesel power station
(b) more than diesel power station
(c) less than diesel power station
30-Oct-15 1:48 AM
100 TOP MOST POWER PLANT Engineering Multiple Choice Questio...
2 of 11
http://engineeringinterviewquestions.com/power-plant-engineering-multi...
Ans: b
28. Economiser is used to heat
(a) air
(b) feed water
(c) flue gases
(d) all above
Ans: b
29. The modern steam turbines are
(a) impulse turbines
(b) reaction turbines
(c) impulse-reaction turbines
(d) none of the above
Ans: c
30. The draught which a chimney produces is called
(a) induced draught
(b) natural draught
oo
ks
(c) forced draught
(d) balanced draught
Ans: b
co
m
/b
31. The draught produced by steel chimney as compared to that produced by brick chimney for the same height is
(a) less
(b) more
o.
(c) same
(d) may be more or less
oi
le
rs
in
f
Ans: b
32. In a boiler installation the natural draught is produced
(a) due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in
(b) due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column
//b
(c) due to the fact that at the chimney top the pressure is more than its environmental pressure
tp
Ans: b
s:
(d) all of the above
ht
33. The draught produced, for a given height of the chimney and given mean temperature of chimney gases
(a) decreases with increase in outside air temperature
(b) increases with increase in outside air temperature
(c) remains the same irrespective of outside air temperature
(d) may increase or decrease with increase in outside air temperature
Ans: a
34. The draught produced by chimney of given height at given outside temperature
(a) decreases if the chimney gas temperature increases
(b) increases if the chimney gas temperature increases
(c) remains same irrespective of chimney gas temperature
(d) may increase or decrease
Ans: b
35. For forced draught system, the function of chimney is mainly
(a) to produce draught to accelerate the combustion of fuel
(b) to discharge gases high up in the atmosphere to avoid hazard
(c) to reduce the temperature of the hot gases discharged
(d) none of the above
Ans: b
30-Oct-15 1:48 AM
100 TOP MOST POWER PLANT Engineering Multiple Choice Questio...
3 of 11
http://engineeringinterviewquestions.com/power-plant-engineering-multi...
36. Artificial draught is produced by
(a) induced fan
(b) forced fan
(c) induced and forced fan
(d) all of the above
Ans: d
37. The draught in locomotive boilers is produced by
(a) forced fan
(b) chimney
(c) steam jet
(d) only motion of locomotive
Ans: c
38. For the same draught produced the power of induced draught fan as compared to forced draught fan is
(a) less
(b) more
(c) same
(d) not predictable
oo
ks
Ans: b
39. Artificial draught is produced by
/b
(a) air fans
om
(b) steam jet
(c) fan or steam jet
Ans: d
rs
in
40. The artificial draught normally is designed to produce
fo
.c
(d) all of the above
(a) less smoke
(d) all of the above
s:
Ans: d
//b
oi
(c) less chimney gas temperature
le
(b) more draught
tp
41. For the induced draught the fan is located
ht
(a) near bottom of chimney
(b) near bottom of furnace
(c) at the top of the chimney
(D) anywhere permissible
Ans: a
42. The pressure at the furnace is minimum in case of
(a) forced draught system
(b) induced draught system
(c) balanced draught system
(d) natural draught system
Ans: c
43. The efficiency of chimney is approximately
(a) 80%
(b) 40%
(c) 20%
(d) 0.25%
Ans: d
44. The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation
30-Oct-15 1:48 AM
100 TOP MOST POWER PLANT Engineering Multiple Choice Questio...
4 of 11
http://engineeringinterviewquestions.com/power-plant-engineering-multi...
(a) pvls=C
(b) pv1126 = C
(c) pv1A = C
(d) pv = C
Ans: a
45. The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry
saturated is
(a) 0.6
(6) 0.578
(c) 0.555
(d) 0.5457
Ans: b
46. The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated
is
(a) 0.555
(b) 0.578
s
(c) 0.5457
ok
(d) 0.6
/b
o
Ans: c
47. The critical pressure ratio of a convergent nozzle is defined as
m
(a) the ratio of outlet pressure to inlet pressure of nozzle
rs
in
fo
.c
o
(b) the ratio of inlet pressure to outlet pressure of nozzle
(c) the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is minimum
(d) the ratio of outlet pressure to inlet pressure only when mass flow rate = c
Ans: d
48. The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation.
(a)pv = C
le
(b)pv1A = C
oi
(c)pv1i = C
//b
(d)pv
s:
Ans: d
49. The effect of considering friction losses in steam nozzle for the same pressure ratio leads to
tp
(a) increase in exit velocity from the nozzle
ht
(6) decrease in exit velocity from the nozzle
(c) no change in exit velocity from the nozzle
(d) increase or decrease depending upon the exit quality of steam
Ans: b
50. The effect of considering friction in steam nozzles for the same pressure ratio leads to
(a) increase in dryness fraction of exit steam
(b) decrease in dryness fraction of exit steam
(c) no change in the quality of exit steam
(d) decrease or increase of dryness fraction of exit steam depending upon inlet quality
Ans: a
51. In case of impulse steam turbine
(a) there is enthalpy drop in fixed and moving blades
(b) there is enthalpy drop only in moving blades
(c) there is enthalpy drop in nozzles
(d) none of the above
Ans: c
30-Oct-15 1:48 AM
100 TOP MOST POWER PLANT Engineering Multiple Choice Questio...
5 of 11
http://engineeringinterviewquestions.com/power-plant-engineering-multi...
52. The pressure on the two sides of the impulse wheel of a steam turbine
(a) is same
(b) is different
(c) increases from one side to the other side
(d) decreases from one side to the other side
Ans: a
53. In De Laval steam turbine
(a) the pressure in the turbine rotor is approximately same as in con¬denser
(b) the pressure in the turbine rotor is higher than pressure in the con¬denser
(c) the pressure in the turbine rotor gradually decreases from inlet to exit from condenser
(d) none from the above
Ans: a
54. Incase of reaction steam turbine
(a) there is enthalpy drop both in fixed and moving blades
(b) there is enthalpy drop only in fixed blades
(c) there is enthalpy drop only in moving blades
s
(d) none of the above
ok
Ans: a
/b
o
55. Curtis turbine is
(a) reaction steam turbine
m
(b) pressure velocity compounded steam turbine
co
(c) pressure compounded impulse steam turbine
Ans: b
56. Rateau steam turbine is
(a) reaction steam turbine
(b) velocity compounded impulse steam turbine
(c) pressure compounded impulse steam turbine
oi
(d) pressure velocity compounded steam turbine
s:
//b
Ans: c
57. Parson’s turbine is
le
rs
in
fo
.
(d) velocity compounded impulse steam turbine
ht
tp
(a) pressure compounded steam turbine
(b) simple single wheel, impulse steam turbine
(c) simple single wheel reaction steam turbine
(d) multi wheel reaction steam turbine
Ans: d
58. For Parson’s reaction steam turbine, degree of reaction is
(a) 75%
(b) 100%
(c) 50%
(d) 60%
Ans: c
59. Reheat factor in steam turbines depends on
(a) exit pressure only
(b) stage efficiency only
(c) initial pressures and temperature only
(d) all of the above
Ans: c
60. The value of reheat factor normally varies from
30-Oct-15 1:48 AM
100 TOP MOST POWER PLANT Engineering Multiple Choice Questio...
6 of 11
http://engineeringinterviewquestions.com/power-plant-engineering-multi...
(a) 0.5 to 0.6
(b) 0.9 to 0.95
(c) 1.02 to 1.06
(d) 1.2 to 1.6
Ans: c
61. Steam turbines are governed by the following methods
(a) Throttle governing
(b) Nozzle control governing
(c) By-pass governing
(d) all of the above
Ans: d
62. In steam turbines the reheat factor
(a) increases with the increase in number of stages
(b) decreases with the increase in number of stages
(c) remains same irrespective of number of stages
(d) none of the above
ks
Ans: a
63. The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is
/b
oo
(a) higher
(b) lower
om
(c) same as long as initial pressure and temperature is unchanged
(d) none of the above
fo
.c
Ans: a
64. In jet type condensers
in
(a) cooling water passes through tubes and steam surrounds them
(c) steam and cooling water mix
(d) steam and cooling water do not mix
Ans: c
//b
oi
le
rs
(b) steam passes through tubes and cooling water surrounds them
65. In a shell and tube surface condenser
tp
s:
(a) steam and cooling water mix to give the condensate
(b) cooling water passes through the tubes and steam surrounds them
ht
(c) steam passes through the cooling tubes and cooling water surrounds them
(d) all of the above varying with situation
Ans: b
66. In a surface condenser if air is removed, there is
(a) fall in absolute pressure maintained in condenser
(b) rise in absolute pressure maintained in condenser
(c) no change in absolute pressure in the condenser
(d) rise in temperature of condensed steam
Ans: a
67. The cooling section in the surface condenser
(a) increases the quantity of vapour extracted along with air
(b) reduces the quantity of vapour extracted along with air
(c) does not affect vapour quantity extracted but reduces pump capacity of air extraction pump
(d) none of the above
Ans: b
68. Edward’s air pump
(a) removes air and also vapour from condenser
30-Oct-15 1:48 AM
100 TOP MOST POWER PLANT Engineering Multiple Choice Questio...
7 of 11
http://engineeringinterviewquestions.com/power-plant-engineering-multi...
(b) removes only air from condenser
(c) removes only un-condensed vapour from condenser
(d) removes air alongwith vapour and also the condensed water from condenser
Ans: d
69. In a steam power plant, the function of a condenser is
(a) to maintain pressure below atmospheric to increase work output from the primemover
(b) to receive large volumes of steam exhausted from steam prime mover
(c) to condense large volumes of steam to water which may be used again in boiler
(d) all of the above
Ans: d
70. In a regenerative surface condenser
(a) there is one pump to remove air and condensate
(b) there are two pumps to remove air and condensate
(c) there are three pumps to remove air, vapour and condensate
(d) there is no pump, the condensate gets removed by gravity
Ans: b
71. Evaporative type of condenser has
oo
ks
(a) steam in pipes surrounded by water
(b) water in pipes surrounded by steam
(c) either (a) or (b)
co
m
/b
(d) none of the above
Ans: a
72. Pipes carrying steam are generally made up of
o.
(a) steel
nf
(b) cast iron
rs
i
(c) copper
ile
(d) aluminium
s:
//b
o
Ans: a
73. For the safety of a steam boiler the number of safety valves fitted are
(a) four
(d) one
ht
(c) two
tp
(b) three
Ans: c
74. Steam turbines commonly used in steam power station are
(a) condensing type
(b) non-condensing type
(c) none of the above
Ans: a
75. Belt conveyer can be used to transport coal at inclinations upto
(a) 30°
(b) 60°
(c) 80°
(d) 90°
Ans: a
76. The maximum length of a screw conveyer is about
(a) 30 metres
(b) 40 metres
(c) 60 metres
30-Oct-15 1:48 AM
100 TOP MOST POWER PLANT Engineering Multiple Choice Questio...
8 of 11
http://engineeringinterviewquestions.com/power-plant-engineering-multi...
(d) 100 metres
Ans: a
77. The efficiency of a modern boiler using coal and heat recovery equipment is about
(a) 25 to 30%
(b) 40 to 50%
(c) 65 to 70%
(d) 85 to 90%
Ans: d
78. The average ash content in Indian co als is about
(a) 5%
(b) 10%
(c) 15%
(d) 20%
Ans: d
79. Load center in a power station is
(a) center of coal fields
(b) center of maximum load of equipments
ks
(c) center of gravity of electrical system
/b
oo
Ans: c
80. Steam pressure in a steam power station, which is usually kept now-a-days is of the order of
m
(a) 20 kgf/cm2
co
(b) 50 kgf/cm2
o.
(c) 100 kgf/cm2
nf
(d) 150 kgf/cm2
le
r
si
Ans: d
81. Economisers improve boiler efficiency by
oi
(a) 1 to 5%
//b
(b) 4 to 10%
s:
(c) 10 to 12%
ht
tp
Ans: b
82. The capacity of large turbo-generators varies from
(a) 20 to 100 MW
(b) 50 to 300 MW
(c) 70 to 400 MW
(d) 100 to 650 MW
Ans: b
83. Caking coals are those which
(a) burn completely
(b) burn freely
(c) do not form ash
(d) form lumps or masses of coke
Ans: d
84. Primary air is that air which is used to
(a) reduce the flame length
(b) increase the flame length
(c) transport and dry the coal
(d) provide air around burners for get¬ting optimum combustion
Ans: c
30-Oct-15 1:48 AM
100 TOP MOST POWER PLANT Engineering Multiple Choice Questio...
9 of 11
http://engineeringinterviewquestions.com/power-plant-engineering-multi...
85. Secondary air is the air used to
(a) reduce the flame length
(b) increase the flame length
(c) transport and dry the coal
(d) provide air round the burners for getting optimum combustion
Ans: d
86. In coal preparation plant, magnetic separators are used to remove
(a) dust
(b) clinkers
(c) iron particles
(d) sand
Ans: c
87. Load carrying capacity of belt conveyor is about
(a) 20 to 40 tonnes/hr
(b) 50 to 100 tonnes/hr
(c) 100 to 150 tonnes/hr
(d) 150 to 200 tonnes/hr
oo
ks
Ans: b
88. Method which is commonly applied for unloading the coal for small power plant is
(a) lift trucks
/b
(b) coal accelerators
m
(c) tower cranes
.c
o
(d) belt conveyor
nf
o
Ans: b
(b) carrying coal in vertical direction
//b
oi
(c) carrying coal in any direction
le
(a) carrying coal in horizontal direction
rs
i
89. Bucket elevators are used for
Ans: b
(b) secondary air
(c) tertiary air
ht
(a) primary air
tp
s:
90. The amount of air which is supplied for complete combustion is called
Ans: b
91. In ______ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners
(a) unit
(b) central
(c) none of the above
Ans: b
92. Under-feed stokers work best for _______ coals high in volatile matter and with caking tendency
(a) anthracite
(b) lignite
(c) semibituminous and bituminous
Ans: c
93. Example of overfeed type stoker is
(a) chain grate
(b) spreader
(c) travelling grate
(d) all of the above
30-Oct-15 1:48 AM
100 TOP MOST POWER PLANT Engineering Multiple Choice Questio...
10 of 11
http://engineeringinterviewquestions.com/power-plant-engineering-multi...
Ans: d
94. Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is
(a) underfeed stoker
(b) overfeed stoker
(c) any
Ans: b
95. TravelUng grate stoker can burn coals at the rates of
(a) 50—75 kg/m per hour
(b) 75—100 kg/m per hour
(c) 100—150 kg/m per hour
(d) 150—200 kg/m2 per hour
Ans: d
ok
s
96. Blowing down of boiler water is the process
(a) to reduce the boiler pressure
/b
o
(b) to increase the steam temperature
co
m
(c) to control the solid concentration in the boiler water by removing some of the concentrated saline water
(d) none of the above
nf
o.
Ans: c
97. Deaerative heating is done to
rs
i
(a) heat the water
Ans: c
98. Reheat factor is the ratio of
://
bo
(c) remove dissolved gases in the water
ile
(b) heat the air in the water
tp
s
(a) isentropic heat drop to useful heat drop
(b) adiabatic heat drop to isentropic heat drop
Ans: c
ht
(c) cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop
99. The value of the reheat factor is of the order of
(a) 0.8 to 1.0
(b) 1.0 to 1.05
(c) 1.1 to 1.5
(d) above 1.5
Ans: c
100. Compounding of steam turbine is done for
(a) reducing the work done
(b) increasing the rotor speed
(c) reducing the rotor speed
(d) balancing the turbine
Ans: c
READ MORE QUESTIONS —–>
PART 1 PART2 PART 3
This entry was posted in POWER PLANT Engineering Questions and Answers. Bookmark the permalink.
30-Oct-15 1:48 AM