BOARD
MECHANICAL
Sunday,
ENGINEERS
February
INDUSTRIAL
,
AND
Licensure
on the
POWER
answer
1.
NO
kPa
sheet
To
A.
276.37
B.
672.73
Use
K.
The
Determine
kg
kg
pencil
containing
demand.
No.2
air
tank
power
C.
D.
suction and
compression
the
and exhaust
filter
95/5
B.
50/50
pm
A
only.
is used to power
has
mass
a
volume
of
remaining
*
B.
A.
01:00
SET
c.
772.73
D.
227.73
complete one cycle,
two stroke engine
A. suction and discharge stroke
A common
—
ENGINEERING
ALLOWED.
tank
500
a.m.
provided.
power
and
Examination
08:00
PLANT
ERASURES
peak
ENGINEERING
the correct answer for each of the following questions. Mark only
item by marking the box corresponding to the letter of your choice
An adiabatic
of
MECHANICAL
2020
INSTRUCTION: Select
one answer for each
STRICTLY
OF
an air turbine
500
when
m3
the
kg
and
during
contains
pressure
air
reaches
times
at
1000
100
kPa.
kg
performs
.
stroke
exhaust stroke
and power stroke
material
used
*
for brazing
tin-antimony
C.
is
Cast
composed
of:
steel
tin-lead
A spherical ball with a diameter of 5 centimeter and whose surface is maintained
at a temperature of 70°C is suspended in the middle of a room at 20°C.
If the
convection
heat
surface
0.8,
is
A.
23.56
B.
9.22
Typical
A.
B.
Is
transfer
what
compression
ratio
ratio
of
is
the
Relative
B.
vapor
humidity
of
be
1
diameter).
480
inch
Circulating
1 psia
water
20.4
43.45
watts
D.
32.77
watts
is
of
in
air
enters
at
C.
mass
D.
humidity
to
be
of
air
if
it
is
with
water
the
101.7
temperature
at
85
deg.
F with hf =
C. 244.8
69.72
in *
40.2
to
(or
be
F and
deg
7/8
6 ft/s.
F.
transfer
copper
in.
tubes
inside
Steam
enters
of one psia and an
liquid at one psia.
leaves
Wet
at
steam
95
deg.
F.
entering
Btu/lb.
.
C.
Controls
Stores
the
refrigerant
D.
Meters
painfully
cold
when
*
electronic
the
walls
heat
The
in
B.
and
is
101.7
compressor
feel
in
of
D.
device
1/16
overall
surface.
lb/hr
at a pressure
leaves
at saturated
condenser
deg.
using
tube
velocity
of 100,000
Condensate
has
ratio
copper
the
comparing
mass
the
ratio
Cycles
precision
the
of
*
and
designed
outside
diameter
circulating
condensate
metering
14°C
10°C
emissivity
ball.
is
vapor
in
hands
the
the
5
12
A.
A.
B.
by
condenser
BTU/°F-ft2
a rate
Btu/lb.
becomes condensate
A. 424.8 in
A
water
*
outside
Entering
the
condenser
at
enthalpy of 1090
4.
of
and
from
C.
cycle
ratio
surface
to
mass
W/m2-C
called:
coefficient
The
Otto
15
transfer
o
.
A two-pass
The
of
is
heat
watts
A.
B.
total
6
10
the
Note:
coefficient
the
watts
saturated
are
is
the
skin
€.
B.
8%
d2°c
temperature
barometer
is
used
pressure
at
a
barometric
subcooling
refrigerant
to
given
*
reaches.
measure
an
flying
airplane’s
altitude
to
altitude
that
on
the
ground. What will be the airplane’s altitude if the Captain’s pilot measures
the barometric pressure at 700 mm-Hg, the ground says it is at 758 mm-Hg, and
the average air density is 1.19kg/m3. g = 9.8 m/s2.
A.
B.
a ke [
The
889
535
total
m
m
heat
C.
D.
of
A.
DB
B.
WB depression
the
temperature
air
is
a
function
980
663
m
m
*
of
C.
DP
D.
WB temperature
temperature
*
12
In a refrigeration
system,
which of the
four
(4)
is not a type
of a water-cooled
condenser?
A.
B.
13.
Shell
Shell
at
a
of
315°C.
C.
Calculate the
A. 22.82m2 *
temperature
Component
A.
Absorber
Rectifier
400
300
500
400
The Coefficient
is usually
A. less than
greater
°C
°C
1
than
performs
discharge
and
exhaust
power
and exhaust
steam
generators
Industrial
tube
Calculate the
gearbox which
steam
used
of
the
the
Generator
22.
One
of
flow
A.
B.
23.
The
at
the
outer
surroundings
code
of
for
the
high
along
complete
system
3
than
4
one
cycle.
utilities
for
electric
power
generating
of
of
of
valves
the
Tf
=
transfer coefficient,
A
Tb = 3000K (270C) which
2930K
immediate
(200C)
vicinity
which
of
the
is
the
gearbox.
1.5 kW
+2.1
kW
of
R-22?
C.
Orange
D.
White
size
should
be
used
and
surrounded
in
steam
by
a
pipe
least
bolt
engine
anchor
engine
that
and,
from
the rate of energy transfer
is the heat
the gearbox,
bolt
bolt
bolt
should
*
be
used
a
line
to
throttle
the
cause
of
black
smoke
plug
globe
*
exhausting
from
the
chimney
of
an
oil-
is:
oil
temperature
secondary
steel
by
is
support
*
C.
airflow
tank
D.
contains
three
a thermal
shell
the
than
to
C.
D.
shell
with
vacuum
less
refrigeration
valve.
stainless
vacuum
long
diameter
diameter
diameter
likely
low
B.
A
the
the
the
following
boiler
A.
from
°C
°C
absorption
less
cylinder
specified
the
most
600
700
D.
surface
away
gate
check
fired
24.
the
is
to
to
actual
C.
D.
bolts
times
times
times
500
600
of
sleeve with an inside diameter of at
A.
2 times
the diameter
of anchor
2
3
3
rises
rate,
in KW during a steady state operation of a
through the input shaft and delivers power through
Silver
B.
C.
D.
the steam temperature
by
*
*
Foundation
Evaporator
D.
h = 0.171 kW/m2-K which
the outer surface area of
color
Green
B.
is cooled by
And for the gearbox as the system,
temperature
is
A.
solution
generators
heat transfer
receives 60 kW
shaft.
1.3 kW
-1.2
kW
What
in which the
boilers
is by convection,
= 1.0 m2 which is
A.
B.
W/m2-
stroke
Fire
the
710
stroke
D.
is
is
stroke
Utility steam generators
water-tube boilers *
temperature
transfer
*
A.
B.
the output
leaves
enters
heat
C.
C.
and
These
are
plants.
system
(COP)
2
suction
suction
C.
21.
Performance
=
*
&
D.
of
and
and
28.77m2
C.
D.
*
of
engine
power
a temperature of 28°C
gases, cp=1.09kJ/kg-K,
coefficient
drops by 30%,
compression
C.
*
steel.
to
to
Two-stroke
tube
shell
counterflow.
C. 32.54m2
refrigeration
strength
unalloyed
B.
20.
for
*
If the ultimate
A.
19.
overall
area
D.
of absorption
tower.
B.
B.
18
The
surface
27.49m2
A.
B.
L%
Double
Double
air enters a preheater at
150°C; 23.7kg/s of exhaust
for
16+
C.
D.
of
of
cooling
Sz
tube
coil
A 22.7kg/s flow
at a temperature
B.
14.
and
and
stainless
conductivity
15°C,
find
rods.
the
low
liquid
steel
of
stack
hygrometer
16.3
magnitude
nitrogen
rods
0.80
W/m2-C.
of
the
emission
at
cm
-190°Cis
in
If the
suspended
diameter
ambient
conductive
heat
and
air
3
in
outside
flow
in
a
meters
the
watts
A.
B.
25«
26.
0.168
0.176
You are
burning
*
c.
D.
working
the
steam plant.
A.
blow
B.
clean
down
gauge
the
fires
C.
add green
coal
D.
blow
the
down
One
insulated
and
consists
thick,
wall
of
the
with
cork.
If
wall
is
%
15
temperature
thermal
28.
One
One
and build up the
of a new
outer
the
water
wood
plate
are
9.0
temperature
Calculate
drop
across
conductivity
the
the
for
cm
drop
across
transfer
cork
*
producing,
to work is:
coal
a
water
cooled
the
0.045,
wall
which
of
the
the
2.25
is
composite
wall
and
coefficients
and
cm
filled
0.18
the
of
W/m-K
13.12°C
12.12°C
it:
motor
*
condenser
disadvantage of a low-side float valve
A. cannot be used on multiple system
B. is nonadjustable
is very expensive
requires a large amount
kJ,
kJ,
faces
through
45,
by 2.5 m high
wood
cavity
Take
as
is that
can
with
hour
wood
D.
a
cork.
608.24
408.24
system
8 m long
inner
extreme
the
amount of refrigerant
a low starting torque
gas in the evaporator
An
form
per
and
C.
D.
float
to
the
of
is
thick.
apart
thickness
of a low-side
cm
heat
steel,
14.12°C
11.12°C
used
*
compartment
1.8
requires a large
can be used with
eliminates flash
be
level
energy
coming
fire
cold-storage
steel
C.
advantage
& determine
A.
B.
C.
C.
D.
29.
glass
and
respectively.
A. 508.24 kJ,
B. 708.24 kJ,
27.
4:00
PM to Midnight
shift
at an
The first thing you would do when
boiler
an
steel
9-182
0.187
is
that
of refrigerant
An air cooled condenser vacuum gage reads
757 mmHg.
Find the absolute pressure
in
it:
*
715
the
mmHg when the barometer stands
air cooled condenser
in kN/m2
at
or
kPa.
30.
A.
6.9
kPa
C.
B.
9.5
kPa
PGHEPkPa
Where
32.
334
are
cycle
A
line
B.
i %
objects
refrigeration
A. -46°C *
hot
be
cooled
often
used
to
in
-26°C
suction
might
be
caused
insufficient
B.
expansion
C.
D.
insufficient
refrigerant
too much refrigerant
is
the
valve
color
closed
code
of
too
much
compressed
38g
D.
violet
hydro-electric
cycle,
plant
B.
isobaric
the
process
the:
using
a
Francis
C.
is
for
the
should
the
with
be
the
isentropic
D.
constant
A.
when
steaming
C.
immediately
after
D.
just
bottom
before
How many watts
mm in diameter
rate
practice,
is high
chemicals
will be radiated
at a temperature
medium
head,
the
speed
gate
what
process?
process
temperature
White
a sample
the boiler on the line
blow
with
cylinder of ammonia?
Gy Silver *
recommended
taken:
during
C.
D.
accordance
*
turbine
weir
transformed
*
code
B. prior to putting
37
heat
Green
analysis
blue
D. deflector
process
What is the color
A. Orange
In
pipelines?
red
B.
36.
air
B.
isochoric
cascade
*
light
Brayton
,
by:
C.
A.
below
process?
-66°C
brown
can be regulated using
A. wicket gate *
In
temperature
A.
a
*
lubrication
B. nozzle
34.
kPa
industrial
C. -36°C
D.
A.
What
In
to
is
6.5
should
be
of
boiler
water
for
pH
a
150
*
taken
down
from a steady
of 910°C?
spherical
black
body
having
A.
B.
38.
8.79
5.34
What
kW
kW
will
be
ft/s2)
A. 4.1
B. 3.1
39
40.
42.
43.
45.
of
30
lbm,
1bf
lbf
A.
Ohm
B.
Ampere
Two-stroke
*
engine
A.
compression
C.
power
D.
suction
performs
& power
suction and discharge
and
exhaust
and
stroke
kW
kW
*
if
its
weighed
es
D.
2.1
5.1
Ibf
lbf
A
Wattage
D.
Voltage
to
*
stroke
C.
exhaust
complete
one
cycle.
at
7000
ft
below
the
water
psf
C.
324,500
psf
512,000
psf
D.
447,000
psf
noise
in
steam
lines
steam expansion
in
(gmoon
=
5.47
is
determined
by
the
stroke
213,000
superheated
moon?
magnitude
time.
B.
A.
the
*
A.
knocking
on
stroke
What will be the pressure
Neglect compressibility.
B.
condensation
C.
D.
high steam pressure
rapid steam expansion
the
line
is
generally
the
surface
of
the
ocean?
*
result
of:
*
During takeoff in a spaceship, an astronaut is subjected to acceleration equal
to 5 times the pull of the carth’s standard gravity. If the astronaut is 180
1bm and the takeoff is vertical, what force does he exert on the seat?
A. 8829 N
C. 4810.9 N *
B.
44.
weight
7.89
3.45
The unit of measurement
for current
flow.
The
number of electrons passing a point at a given
B.
41.
the
C.
D.
In
9620
power
N
D.
plants,
A.
prevent
B.
C.
D.
When
boiler
feed
water
scale
formation
increase
the
temperature
increase
oxygen
increase
water
the
4414.5
is
*
of
N
chemically
the
treated
in
order
to:
water
formation
foaming
temperature
of
stack
gases
rises
considerably
above
the
normal
operating stack temperature,
it generally indicates:
A. that the boiler is operating efficiently
46.
47.
B.
a
low
C.
a
heavy
boiler
D.
that
the
Impulse
B.
Deriaz
A.
solenoid
amount
The
B.
C.
The
sound
box,
49.
flow
valve controls
of refrigerant
level
of
Configuration
Psychrometric
D.
Fan
in
speed
and
of
supply
ducts,
the
going
going
in
air
Pt = 100
A.
0.79 m3/kg
B.
0.92
a
air
VAV
for
diffusers
static
RPM
of
kPa.
and
the
the
VAV
the
air
temperature
It
is
in
turbine
evaporator
*
coils
compressor
expansion valve
other
across
Air
size
*
coils
Volume)
box,
depends
confiquration
mainly
of
the
on
VAV
factor?
the
VAV
box
in
WC
*
actuator od the VAV box
air entering the VAV box
fan
of
an
air-vapor
mixture
in
following
conditions
prevail:
€.
0.89 m3/kg
*
D.
0.69
desired
the
turbine
(Variable
what
m3/kg
heater.
the
specific
A 4 meter x 5 meter x 6 meter special
resistance
Francis
Propeller
going to the evaporator
pressure
volume
when
C.
D.
Box
a
of the Damper
properties of
specific
dry
*
to the
to the
of the refrigerants
B.
C.
of
stack
the:
entering
refrigerant
refrigerant
Difference
kg/kg,
50.
of
of
power
flexible
kilogram
the
dirty
type of turbine
A.
Calculate
in
are
turbine
amount
amount
Volume
tubes
turbine
D. pressure
48.
level
condition
boiler
A high discharge
A.
water
smoke
storage
that
special
the
storage
cubic
t
=
meters
30°C,
w
=
per
0.015
m3/kg
room is to be heated by a baseboard
resistance
room
from
heater
7°C
be
to
able
23°C
to
raise
within
15
minutes. Assuming no heat losses from the special storage room and an atmospheric
pressure of 100 kPa, determine the required power of the resistance heater.
Constant specific heats at room temperature to be assumed.
A. 4.56 KW
C. 2.34KW
B. 1.91 KW *
D. 6.34KW
51.
In
an
experiment
bomb
to
calorimeter,
determine
the
mass
the
of
calorific
the
sample
value
of
fuel
is
of
an
oil
0.75
fuel
by
gram,
means
mass
of
of
a
water
surrounding the bomb 1.8 kg, water equivalent of bomb and fittings 470 grams,
and the rise in temperature is 3.3°C.
What is the calorific value of this oil
in MJ/kg assuming a specific heat of water = 4.2 kJ/kgK.
A.
25.63M3/kg
B.
Based on
53.
C.
32.15MJ/kg
industry
consumption
of the
temperature
inlet
A.
2.0 percent
B.
1.5
than
is
practice,
air
to
cooker
the
operates
possible
at
41.94MJ/kg
for a specified
compressor
decreases
by
of compressed
for
C.
2.5 percent
D.
1.0
cooking
atmospheric
*
amount
by
compressor.
percent
A pressure
65.63MJ/kg
D.
food
percent
at
conditions.
air,
each
the power
3 % drop
in the
*
a higher
pressure
Steam
contained
is
and
temperature
in
the
sealed
pot,
with vent hole in the middle of the cover,
allowing steam to escape.
The
pressure is regulated by covering the vent hole with a small weight,
which is
displaced slightly by escaping steam. Atmospheric pressure is 100 kPa, the vent
hole
area
is
7-mm2,
and
of the weight?
A.
B.
54.
55.
In a flooded
A. passes
does
stays in the receiver
passes directly into the
not
PVC.
and
However,
methods
pipe
(up
to
can
100
A.
Chlorinated
B.
C.
Polyvinyl Chloride
(PVC)
Polyetheyene
(PE) pipe
Polyvinyl
turbine
which
of velocity
of
90%
diameter
A.
B.
jet
What
is
the
mass
float
valve,
flash
gas:
0.98,
has
this
pipe
for
hot
are
very
water
(up
similar
to
to
180
those
°F)
in
a
(CPVC)
*
pipe
Styrene
(ABS)
a diameter
peripheral
from
used
psi).
speed
nozzle
of
2933
2366
6
C.
D.
of
pipe
60
in.,
factor
in.
speed
of
0.45,
Determine
2862
2512
the
of
350
rpm,
generator
power
coefficient
efficiency
input
in
of
hp.
*
Pure water enters a 3 cm diameter copper tube with a velocity of 50m/s and a
temperature
of
20°C
and
is
heated.
What
is
the
average
unit
convective
coefficient.
For
water,
kinematic
viscosity=1.06x10-6m2/s;
thermal conductivity=0.597W/m-K.
A. 23.45
B.
58.
kPa.
1.75 kg
0.107 kg *
for
be
Chloride
Acrylonitrilebutadiene
and
250
evaporator
joining
this
system
A hydraulic
be
occur
applications
for
should
evaporator using an accumulator and
directly into the suction line *
C.
D.
The
inside
C.
D.
B.
D.
5%
pressure
0.1783 kg
1.05 kg
pressurized
56.
the
The
rpm
the
123.54
C.
76.12
D.
86.6
kW/m2-K
Prandt
number=7;
and
*
journals of a stainless
steel shaft are 38.0 cm diameter,
it runs at 105
and the coefficient of friction between journals and bearings
is 0.02.
If
average load on the bearings is 200 kN, find the heat generated per minute
at the bearings.
59
A.
501.575
B.
505.575kJ
An
insulated
inside
kJ
steam
diameter
corrugated
air,
ho
with
film
pipe
5.0
asbestos
=
insulation
of
12
W/m2-K.
located
cm
coefficient
Inside
hi
= 6000
60.
A.
120
B.
110w
What
A.
is
1.0
is
the
W
the
Orange
color
code
for
the
kJ
401.375
kJ
cm
12.5
pipe
#W/m2-K.
are 45 and 0.12 W/m-K
length of pipe.
501.375
D.
where
with
insulation
C.
the
ambient
thick
cm
is
wall.
and
steam
Thermal
130w
D.
140
cylinder
C.
of
W
is
The
diameter
outside
surface
having
Determine
*
R-134a?
Ssilver
temperature
32°C,
coefficient
a temperature
conductivity
respectively.
C.
the
*
of
pipe
the heat
and
has
of
of
of
an
the
still
170°C
asbestos
loss per unit
B.
61.
You
Green
are
D.
working
the
4:00
PM
burning steam plant. The
A. clean the fires
B.
add green
coal
C.
blow
the
D.
625
down
blow
What
down
other
depends
configuration
of
A.
Difference
B.
Design
of
D. Design
3=
The
655
sound
flow
remove
properties
the VAV
fan
of
mud
A.
increase
B.
decrease
an
energy
when
coming
producing,
to
work
coal
is:
level
level
of
*
of
supply
a
air
Variable
for
air
leaving
the
VAV
a
Air
specific
ducts and
in WC.
*
Volume
Box
size
box,
diffusers?
box.
of the VAV box
drum water
of
in
*
level
impurities
*
the boiler at exit
Rankine Cycle.
will
be
C.
equally
D.
remains
+ by
the
also
increasing
constant
Pure steam at a pressure of 30 bar, and at a temperature of 375°C,
is
in a boiler at the rate of 3000 kg/h from feed water at a temperature
C.
D.
Armstrong,
the pull
an
said
astronaut
does he exert on
A. 4414.5 N
B. 8829 N
The
A.
astronaut
of the earth’s
180
mud
A newly
and
aq
subjected
1lbm
and
to
a
*
to
an
acceleration
during
the
take
off
C.
D.
4810.9
9620 N
N
equal
the takeoff
is
to
5
times
of a spaceship.
vertical,
determine
If
force
installed turbine
receives
temperature
of
2450°R
and
The exponent
*
boiler:
leg
14.7 psia.
53
of
seat.
term spalling refers
flue gas content
B.
8954kW
3349kW
standard gravity,
is
the
is
generated
of 130°C.
42 MJ/kg and the daily consumption is
engine power if the overall efficiency
2546kW
5634kW
Neil
the
68.
water
of the Damper
boiler priming
the boiler water
moisture content
boiler pressure
A.
B.
67 s
at
do
fire
power
The fuel has a calorific value of
tonne. What will be the eguivalent
the plant is 0.13.
66.
would
the variable
air volume
box,
flexible
in static pressure
across the VAV box
configuration
increase
increase
D.
The
the
the
*
shift
you
& determine
volume
Blue
bottom blow down on a boiler
is used to:
A.
reduce steam pressure
in the header
B.
C.
64.
glass
the
Psychrometric
C.
thing
and build up the
will
than
to Midnight
first
boiler
gauge
factor
other
Light
C.
soot
D.
combustion
blower
chamber
*
150 lbm/sec
of air at a pressure
of 63 psia
expands
it polytropically
to a pressure
of
n is equal to 1.45 for the process.
Determine
the power
required.
69.
A.
53,343.16
kW
C.
52,343.16
BTU/sec
B.
53,343.16
ft-1b/sec
D.
53,343.16
HP
What
is
the
Note:
@
60°F;
A.
9.43
Blow
14.7
the
psia
off piping
A.
..,
air
vent
at
12300
psia
and
density
9.33 psia
B.
79 5
pressure
atmospheric
of
ft
altitude
60°F
air
at sea
is
*
usually
pipes
refers
0.0763
9.63 psia
D.
9.53
piping
coming
from
piping
piping
coming
at the
from the safeties
lowest part of the
surface
silica
temperature
to
is
maintain
used
the outside.
and steel,
refractory
A.
B.
217
218
the
adjacent
of
super
the
outside
to
;
incompressible,
Pl
=
14.7
if
the
psia
psia
the
hot
of
heater
boiler
side
the
of
*
the
wall
combustion
if the heat loss
silica;
0.15 for
should be kept at
insulating brick,
219
220
40°C.
chamber
of insulating bricks
C.
D.
furnace
at
What thickness
mm
mm
is
to:
C.
D.
The
air
lbm/ft3
C.
B.
desired
the
if
level?
*
and
A
wall
is
1200°C.
15.2
cm
of
1.0
cm
of
steel
is necessary between
788
and
mm *
mm
W/m2? use k =13.84
45 for steel.
It
is
refractory
covers
refractory
W/m-K
for
724
A centrifugal boiler feed pump requires 5 hp to drive it a certain speed, head
and discharge rate. If the speed and quantity of water delivered are doubled
and the total head quadrupled, the horsepower required will be approximately
equal
A.
B.
#3a
to:
30
C.
40
10
D.
20
As a safety precaution,
in the
vapor space,
T4.
Horizontal
C.
Upright
B.
Any
D.
Upside
hydrostatic
A.
removed
A college
turns
*
test,
her
through
watts
walls
and
fan
windows,
The
mass
with
20%
4 meters
leaves
x 6 meters
the
room
the
on
x 5 meters
a
summer
evening.
any heat
temperature
in
the
room
when
it
makes
fuel
is
excess
burned
of
a
air
in
a
fuel
2569
5689
The mass
of Freon
A.
B.
are:
is
84%
relative
to
boiler,
what
a little or no
C. Conduction
room
carbon,
are 250°C
oxygen by
oxygen
16,
carbon
14%
the
12,
C.
D.
and
2%
requirement.
2759
1256
flow
rate
1.
m3/hr
m3/hr
to
rise
10
deg
F.
The
water
flow
€.
D.
rate
845
83
ash.
It
100
of
k
is
kg/h
the
and
burned
of
gas
if
atomic
this
its
mass
*
flow rate of Freon 12 through a heat exchanger is 10
entry is 102 BTU/lb and of Freon exit is 26 BTU/lb.
76
54.3
and transferring
If
bar respectively?
Ro=8.3143 kJ/kg mol
hydrogen
KJ/kg.
If
20%. What
*
hydrogen
volumetric
and 1
mass.
m3/hr
m3/hr
when
temperature,
she leaves.
difference.
Refrigeration
stoichiometric
is
day,
Assuming
transfer
28.13°¢
D.
analysis
allowed
in
liters
per
lbs/min. Enthalpy
Water coolant is
minute
is:
*
Hot gases at a temperature of 280°C flow on one side of a metal plate of 1.0 cm
thickness and air at 35°C flows on the other side. The heat transfer coefficient
of the gases
is 31.5 W/m2-K and that of the air is 48 W/m2-K.
Calculate
the
over-all
transfer
coefficient.
A.
18.94
W/m2-K
*
B.
15.82
Tubing
A.
B.
W/m2-K
used
Any
of
for
air
conditioning
the
the
discharge
D.
the
high-pressure
Piping
having
line
low pressure
installation
shall
located
C.
81.25
W/m2-K
D.
91.48
W/m2-K
installations
against
be
not
the
side
from
crossing
less
ceiling
an
than
of
the
open
such
condenser
space
space
and
jurisdiction.
m*
C.
4.2
m
B.
3.5
m
D.
5.5
m
refrigerant
Water
R-11
*
used
in steam
jet
cooling
C.
D.
to
that
above
2.2
A.
B.
usually
insulated
at:
*
side
A.
The
is
these
C.
building
B83=
of
she
determine
Convection
A.
B.
82.
be
D. 24 ky/s
from a place where it is not wanted
heat
to a place where
conditioning
relationship
gls
room
before
Ds
B. 28 kg/s *
A process of removing
the
*
be cooler when she comes back in the
are tightly closed and disregarding
the
temperature and pressure
Note: Air contains 23.1%
80.
with
The enthalpy of ground H20 in a 20 MW geothermal power plant is 1000
the quality after throttling is 28% & the overall plant efficiency is
is the mass flowrate of the steam entering the turbine?
A. 18 kg/s
C. Todg/s
B.
749..
contact
down
should
open
in a dormitory
electric
48.13°C
that heat
A. Air
78.
C.
in
comes back 10 hours later.
Use specific heat values at
assume the room to be at 100 kpa and 15°C in the morning
BAs 5B.13°C *
C.38.13°C
B.
P
valves
valve
D. closed
living
150
the
safety
closed
student
on
the
hoping that the room will
all the doors and windows
164
should be stored and transported
A.
During
she
and
cylinders
position
to keep the pressure
relief
not the liquid inside the cylinder.
B. partially
=
refrigerant
*
is:
Ammonia
Steam
the
is
the
metering
affords
floor
passageway
unless
permitted
by
the
the
in
piping
any
is
authority
84.
85.
Calculate
the
air-fuel
ratio
octane
gas,
with theoretical
A.
69.5 kgair/
B.
49.5
The
86.
A
its
87=
kgfuel
(B4)
shall
vent
B.
C.
diffuser *
jet nozzle
D.
convergent-divergent
water.
be
for
C.
59.5 kgair
D.
95.5kgair
vented
to
the
the
/ kgfuel
/
combustion
of
*
kgfuel
atmosphere
through
a
fitted
pipe
steel
What
nozzle
cylindrical
rotational
with
speed
1
is
ft
diameter,
required
to
4
ft
spin
A.
7.22
rad/s
C.
22.7
rad/s
B.
27.2
rad/s
D.
72.2
rad/s
C.
D.
flammable
all of these
Freon
complete
extremity.
A.
high
water
tank
out
contains
the
3
ft
top?
*
is:
A.
B.
88.
/
line
upper
stainless
of
kgfuel
kgair
discharge
to
on a molar
basis
amount
of air.
non-corrosive
nontoxic
A V-type
3.0
liter,
S5-cylinder,
4-stroke
cycle
*
SI
engine,
with
a volumetric
efficiency of 82%, operates at 3000 RPM using gasoline with a 2 =
0.91. Bore
and stroke are related as S = 1.08B.
At a certain point in the engine cycle,
the gas temperature in the combustion chamber is Tg = 21000C while the cylinder
wall
(air
temperature
at 11450C)
is TW = 1900C. Viscosity, and Thermal conductivity of gases
2g = 5.21x10-5
kg/m-sec,
kg = 0.090 W/m=K respectively.
Convective heat transfer coefficient of cl = 0.035 and c2 = 0.08. Compute the
approximate convection heat transfer rate to the cylinder wall at this instant.
A. 35.44 kW/m2
C. 32.54 kW/m2
B.
54.32
B9
*
consists
D.
of
refrigerant
45.52
mixtures
kW/m2
of
two
or
more
different
chemical
compounds,
often used individually
A. compound reaction
as refrigerants for other applications.
C. mixing of refrigerants
An
boiler
B.
902
kW/m2
absorption
economizer
is
used
with
a
D.
steam
blends
*
in
order
to
raise
the
temperature
of
the:
i1
A.
boiler
B.
engines
air used
exit
air used
turbines
D.
boiler
Fuel
oil
98-
feed
water
by
the
fuel
fuel
utilizing
in a storage
tank
is equal
C.
D.
of
the
A
nozzle
30 m.s
receives
and with
and
with
0.5
kg/s
an enthalpy
an
enthalpy
of
air
923
at
660
to
then
zero,
a
Determine
726
m/s
D.
660
m/s
is
C.
D.
high
compression
fuel
fresh
-18°C
valve
supply
in
a
of
open
50
NOT
pipe
pressure
too
long
kilograms
electric
freezer.
the
of
kJ/kg.
C.
in exhaust
the
steam
exit
the process
compressed
for each
and
m/s
following
of
pressure
m/s
the
some
heat
in
the
from
the
flue
gases
*
will
become
*
kJ/kg,
923
carbon
in
the
steam
air, the power
3°C drop in the
1 percent *
2.5 percent
700
of
heat
coils
B.
A.
to
of
of
or
of:
A.
Which
A
of
turbines
exhaust
isothermal
isentropic
C.
D.
the
some
hot air
electric
As a rule of thumb,
for a specified amount
consumption of the compressor decreases by
temperature inlet air to the compressor.
2 percent
1.5 percent
from
utilizing
by use
C.
D.
coefficient
steam
utilizing
some
burner
B. overload on engine
96.
the
for combustion of
or steam engines
Thompson
700 kPa
nozzle.
955
of
exhaust
isobaric
isenthalpic
A.
B.
94.
utilizing
combustion
is heated
If Joule
by
gases
fuel oil
steam *
A.
B.
water
for
flue
C.
A.
B.
e,
feed
cause
of
the
2700
air
kPa
leaves
the
exit
and
a
at
velocity
a pressure
velocity
from
of
of
the
*
black
smoke
in
contained
in
diesel
engine?
*
chicken
What
at
will
6°C
be
the
amount
a box
of
heat
is
to
that
be
frozen
needs
to
be
removed?
is
3.32
The
KJ/kg-C
latent
above
heat
of
freezing
the
chicken
and
1.77
is
247
KJ/kg-C
KJ/kg,
below
box is 1.5 kilograms,
and the specific heat of the box
C. And the freezing temperature of chicken is -2.8°C.
A. 15,206.4 KJ *
C. 15,156 KJ
B.
9%.2
98.
In
which
D.
direction
Down
From
warm
C.
From
a cold
D.
Up
If
the
specific
of mercury?
What
139.2
193.2
kind
A.
B.
100.
KJ
A.
B.
A.
B.
99
11,863
does
heat
substance
to
a cold
to
of
refrigerant
mercury
is
B.
Manual:
C.
D.
Electric
(battery)
Using another engine
rope,
crank
is
heat
container
1.4
KJ/kg-
is
the
specific
weight
of
starting
diesel
*
substance
SP
=
13.55,
what
C.
D.
123.9
132.9
kN/m3
kN/m3
C.
D.
Butane *
None of these
is
*
R-600?
Methane
Nonane
Among the four
(4), which
engine?
A. Compressed air
material
specific
The
KJ
substance
a warm
kN/m3
kN/m3
of
its
flow?
substance
gravity
1250
and
freezing.
of
and
the
following
is
not
kick
*
x4k
ANSWER
KEY
END
BY:
*r*
ENGR.
MAA
a
method