Blue book terms part 1
a.
b.
c.
d.
Is the most common dryer used which consist
of rotating cylinder inside which the materials
flow while getting in contact with hot gas.
Tower dryer
Centrifugal dryer
Trey dryer
Rotary dryer
a.
b.
c.
d.
Is the ratio of the mass of water-vapor in air
and the mass of air if it is saturated is called:
Humidity ratio
Mass ratio
Vapor ratio
Relative humidity
a.
b.
c.
d.
The hands feel painfully cold when the skin
temperature reaches
8 deg C
10 deg C
12 deg C
14 deg C
a.
b.
c.
d.
The refrigerant used in steam jet cooling is:
Steam
R-11
Ammonia
Water
a.
b.
c.
d.
The total heat of the air is a function of
WB temperature
DP temperature
DB temperature
WB depression
a.
b.
c.
d.
Boiling point of Freon-12 at atmospheric
pressure is:
21 deg F
15 deg F
5 deg F
28 deg F
a.
b.
c.
d.
Which of the following is NOT a type of water
cooled condenser in refrigeration?
Double pipe
Double shell
Shell and coil
Shell and tube
a.
b.
c.
d.
Component of absorption refrigeration
system in which the solution is cooled by
cooling water.
Rectifier
Generator
Evaporator
Absorber
a.
b.
c.
d.
Cascade refrigeration cycle is often used in
industrial process where objects must be
cooled to temperature below:
-46 deg C
-56 deg C
-66 deg C
-76 deg C
a.
b.
c.
d.
Type of refrigerant control designed to
maintain a pressure difference while the
compressor is operating.
Thermostatic expansion valve
Using low side float flooded system
Automatic expansion valve
Capillary tube
a.
b.
c.
d.
As a rule of thumb, for a specified amount of
compressed air, the power consumption of
the compressor decreases by
______________ for each 3 deg C drop in the
temperature inlet air to the compressor.
1 percent
1.5 percent
2 percent
2.5 percent
a.
b.
c.
d.
Modern way of detecting air compressor leak
is by using
Soup and water
Air leak detector
Acoustic leak detector
Ammonia leak detector
a.
b.
c.
d.
For foundation of stacks, the maximum
pressure on the soil is equal to the pressure
due to the weight and the ___________.
Soil movement
Wind movement
Ground movement
Engine movement
a.
b.
c.
d.
Foundation bolts of specified size should be
used and surrounded by a pipe sleeve with an
inside diameter of at least
3 times the diameter of engine bolt
2 times the diameter of engine bolt
3 times the diameter of anchor bolt
2 times the diameter of anchor bolt
a.
b.
c.
d.
For multi stage compression of an ideal
Brayton cycle, the back ratio will
Increase
Decrease
Remains the same
None of these
a.
b.
c.
d.
Type of turbine that has a specific speed
below 5.
Impulse turbine
Propeller turbine
Francis turbine
Deriaz turbine
a.
b.
c.
d.
A high discharge type of turbine
Impulse turbine
Propeller turbine
Francis turbine
Deriaz turbine
a.
b.
c.
d.
Use to minimize the speed rise due to a
sudden load rejection
Needle valve
Wicket gate shut-off
Shut-off valve
Jet deflector
a.
b.
c.
d.
Is the speed of a turbine when the head on
the turbine is one meter
Specific speed
Rated speed
Utilized speed
Unit speed
a.
b.
c.
d.
Is a fluid property which refers to the
intermolecular attraction by which the
separate particles of the fluid arc held
together.
Cohesion
Adhesion
Surface tension
Hypertension
a.
b.
c.
d.
Which of the following is NOT the cause of
black smoke in diesel engine?
Fuel valve open too long
High compression pressure
Carbon in exhaust pipe
Overload on engine
a.
b.
c.
d.
Which of the following is not a method of
starting a diesel engine?
Manual: rope, crank and kick
Electric (battery)
Compressed air
Using another generator
a.
b.
c.
d.
Two-stroke engine performs ________ to
complete one cycle.
Suction and discharge stroke
Compression and power stroke
Power and exhaust stroke
Suction and exhaust stroke
a.
b.
c.
d.
A type of geothermal plant used when there
is a presence of brine extracted from
underground
Dry geothermal plant
Double-flash geothermal
Single flash geothermal plant
Binary geothermal plant
a.
b.
c.
d.
Is the most important safety device on the
power boiler.
Check valve
Gate valve
Safety valve
Globe valve
a.
b.
c.
d.
During hydrostatic test, the safety valves
should be
Removed
Open
Closed
Partially closed
a.
b.
c.
d.
Where deaerating heaters are not employed,
it is recommended that the temperature of
the feed water be not less than ______
197 deg C
102 deg C
104 deg C
106 deg C
a.
b.
c.
d.
Is a reaction during which chemical energy is
released in the form of heat.
Cosmic reaction
Ethnic reaction
Endothermic reaction
Exothermic reaction
a.
b.
c.
d.
By reheating the steam in an ideal Ranking
cycle the heat rejected will.
Increase
Decrease
Remains the same
None of these
a.
b.
c.
d.
By increasing the boiler pressure in Rankine
cycle the moisture content at boiler exit will.
Increase
Decrease
Remains the same
None of those
a.
b.
c.
d.
Presently the highest steam temperature
allowed at the turbine inlet is about ______.
340 deg C
520 deg C
620 deg C
1020 deg C
a.
b.
c.
d.
Two most common gases employed in
Stirling and Ericsson cycles are.
Air and helium
Oxygen and helium
Hydrogen and helium
Nitrogen and helium
a.
b.
c.
d.
In most common design of gas turbine, the
pressure ratio ranges from
10 to 12
11 to 16
12 to 18
15 to 20
a.
b.
c.
d.
In brayton cycle, the heat is transformed
during what process?
Constant temperature
Isentropic process
Isobaric process
Isochoric process
a.
b.
c.
d.
The fuel injection process in diesel engine
starts when the piston ______
Is at the TDC
Leaving TDC
Approaches TDC
Halfway of the stroke
a.
b.
c.
d.
If the cut-off ratio of diesel cycle increases,
the cycle efficiency will
Decrease
Increase
Remains the same
None of these
a.
b.
c.
d.
The fuel used in a power plant that is used
during peak periods.
Gas
Solid
Liquid
None of these
Typical compression ratio of Otto cycle is
a. 6
b. 8
c. 10
d. 12
a.
b.
c.
d.
If joule Thomson coefficient is equal to zero,
then the process will become
Isentropic
Isenthalpic
Isobaric
Isothermal
a.
b.
c.
d.
If the fluid passed through a nozzle its
entropy will:
Increase
Decrease
Remains the same
None of these
a.
b.
c.
d.
Refrigerant consisting of mixtures of two or
more different chemical compounds, often
used individuals as refrigerant for other
applications.
Suspension
Compound reaction
Blends
Mixing of refrigerant
a.
b.
c.
d.
Pairs of mating stop valves that allow
sections of a system to be joined before
opening these valves or separated after
closing them
Check valve
Gate valve
Safety valve
Campanion valve
a.
b.
c.
d.
An enclosed passage way that limits travel to
a single path.
Corridor
Hallway
Lobby
Tunnel
a.
b.
c.
d.
For immediate dangerous to life or health
(IDHL), the maximum concentration from
which unprotected persons are able to escape
within _____ without escape-impairing
symptoms or irreversible health.
15 min
1 min
20 min
30 min
a.
b.
c.
d.
The volume as determined from internal
dimensions of the container with no
allowance for the volume of internal parts.
Internal allowance
Internal gross volume
Internal interference volume
Internal fits volume
a.
b.
c.
d.
A waiting room or large hallway serving as a
waiting room
Terrace
Rest room
Compound room
Lobby
a.
b.
c.
d.
A continuous and unobstructed path of travel
from any point in a building or structure to a
public way
Average of aggress
Mean of aggress
Hallway of aggress
Pathway of aggress
a.
b.
c.
d.
Any device or portion of the equipment used
to increase refrigerant pressure
Pressure relief device
Pressure-imposing element
Pressure lift device
Pressure limiting device
a.
b.
c.
d.
The quantity of refrigerant stored at some
point is the refrigeration system for
operational, service, or standby purposes/
Pressure vessel
Pumpdown charge
Liquid receiver
Accumulator
a.
b.
c.
d.
Secondary refrigerant is a liquid used for the
transmission of heat, without a change of
state, and having no flash point or a flash
point above ______ as determined from
ASTM
150 F
160 F
180 F
200 F
a.
b.
c.
d.
A service valve for dual pressure-relief
devices that allows using one device while
isolating the other from the system,
maintaining one valve in operation at all
times.
Three-way valve
Two-way valve
One-way valve
Four-way valve
a.
b.
c.
d.
Tubing that is unenclosed and therefore
exposed to crushing, abrasion, puncture, or
similar damage after installation.
Protected tubing
Bare tubing
Open tubing
Unprotected tubing
a.
b.
c.
d.
Refers to blends comprising multiple
components of different volatile that, when used
in refrigeration cycles, change volumetric
composition and saturation temperature as they
evaporate (boil) or condense at constant
pressure.
Zeolite
Blending
Composition
Zeotropic
a.
b.
c.
d.
Is a premises or that of a premise from which,
because they are disabled, debilitated, or
confined, occupants cannot readily leave
without the assistance of others
Institutional occupancy
Public assembly occupance
Residential occupancy
Commercial occupancy
a.
b.
c.
d.
Is one in which a secondary coolant is in
direct contact with the air or other substance
to be cooled or heated.
Double indirect open spray system
Indirect open spray system
Indirect closed system
Indirected, verted closed system
a.
b.
c.
d.
Refrigerant number R-744 is
Butane
Carbon monoxide
Propane
Carbon dioxide
a.
b.
c.
d.
Refrigerant number R-1150 is
Propylene
Ethene
Ethane
Methyl formate
a.
b.
c.
d.
Refrigerant R-40 is
Chlorodifluoromethane
Difluoromenthane
Ammonia
Chloromethane
When the air duct system serves several
enclosed spaces, the permissible quantity of
refrigerant in the system shall not exceed the
amount determined by using the total volume of
those spaces in which the airflow cannot be
reduced to less than ____ of its maximum when
the fan is operating
a. One-quarter
b. One half-quarter
c. Three-quarter
d. One-fourth-quarter
a.
b.
c.
d.
The space above a suspended ceiling shall not
be included in calculating the permissible
quantity of refrigerant in the system unless
such space is continuous and is part of the air
return system
Partition
Plenums
Separator
Plate divider
a.
b.
c.
d.
Which of the following is not a possible
location of service valve?
Suction of compressor
Discharge of compressor
Outlet of liquid receiver
Outlet of condenser
a.
b.
c.
d.
A coil in series with evaporator that is use to
prevent the liquid refrigerant entering the
compressor
Accumulator
Liquid superheater
Drier loop
Liquid suction heat exchanger
a.
b.
c.
d.
A type of valve connected from discharge of
compressor directly to suction that is
normally closed and will open automatically
only if there is high discharge pressure
Check valve
Solenoid valve
King valve
Relief valve
a.
b.
c.
d.
Use to increase the capacity of condenser
Water regulating valve
Desuperheating coils
Liquid-suction heat exchanger
Condenser heating coils
a.
b.
c.
d.
Is use to subcooled the refrigerant from the
condenser
Liquid subcooler
Condenser subcooler
Desuperheating coils
Liquid receiver
a.
b.
c.
d.
Which of the following is NOT a part of low
pressure side in refrigeration system?
Compressor
Condenser
Liquid line
Suction line
a.
b.
c.
d.
Which of the following is NOT a part of high
pressure side in refrigeration system?
Compressor
Condenser
Liquid line
Suction line
a.
b.
c.
d.
Which of the following is NOT a part of
condensing unit?
Compressor
Discharge line
Condenser
Liquid line
a.
b.
c.
d.
By subcooling the refrigerant in refrigeration
system, the compressor power per unit mass
will
Increase
Decrease
Remains the same
None of these
a.
b.
c.
d.
Superheating the refrigerant in refrigeration
system without useful cooling, the
refrigeration effect per unit mass will
Increase
Decrease
Remains the same
None of these
a.
b.
c.
d.
By subcooling the refrigerant in refrigeration
system, the specific volume at compressor
suction will
Increase
Decrease
Remains the same
None of these
a.
b.
c.
d.
Pressure loss due to friction at the condenser,
the compressor power per unit mass will
Increase
Decrease
Remains the same
None of these
a.
b.
c.
d.
Which of the following is NOT a type of aircooled condenser?
Shell and tube
Natural draft
Forced draft
Induced draft
a.
b.
c.
d.
A type of refrigerant control typically used in
household refrigeration
Thermostatic expansion valve
Automatic expansion valve
Capillary tube
High side float
a.
b.
c.
d.
Type of condenser that operates like a
cooling water
Air-cooled condenser
Evaporative condenser
Shell and tube condenser
Water cooled condenser
a.
b.
c.
d.
The major problem of heat pump is
Refrigerant used
Outside air
Supply air
Frosting
a.
b.
c.
d.
Dominant refrigerant used in commercial
refrigeration system
R11
R22
R12
R502
a.
b.
c.
d.
Cascade refrigerant system are connected in
Series
Parallel
Series-parallel
Parallel
a.
b.
c.
d.
Is use to heat up the solution partially before
entering the generator in absorption
refrigeration system
Rectifier
Absorber
Regenerator
Pump
a.
b.
c.
d.
The COP of actual absorption refrigeration
system is usually
Less than 1
Less than 2
Less than 3
Less than 4
a.
b.
c.
d.
Sight glass is often located at
Discharge line
Liquid line
Between condenser and liquid receiver
Suction line
a.
b.
c.
d.
Use to detects a vibration in current caused
by the ionization of decomposed refrigerant
between two opposite charged platinum
electrodes
Electronic detector
Halide torch
Bubble method
Pressurizing
a.
b.
c.
d.
The ability of oil to mix with refrigerants
Carbonization
Purging
Mixing
Miscibility
a.
b.
c.
d.
Joints and all refrigerants-containing parts of a
refrigerating system located in an air duct
carrying conditioned air to and from an occupied
space shall be constructed to withstand a
temperature of ____ without leakage into the
airstream.
550F
600F
650F
700F
a.
b.
c.
d.
Refrigerant piping crossing an open space that
affords passageway in any building shall be not
loss than ______ above the floor unless the
piping is located against the ceiling of such
space and is permitted by the authority having
jurisdiction
2.2 m
3.2 m
4.2 m
5.2 m
a.
b.
c.
d.
Methyl chloride shall not be in contact with
Aluminum
Zinc
Magnesium
All of these
a.
b.
c.
d.
Shall not be in contact with any halogenated
refrigerants
Aluminum
Zinc
Magnesium
All of these
a.
b.
c.
d.
Are suitable for use in ammonia system
Copper
Aluminum and its alloy
Plastic
Cast iron
a.
b.
c.
d.
In a pressure-relief device is used to protect a
pressure vessel having an inside dimension of 6
in or less, the ultimate strength of the pressure
vessel so protected shall be sufficient to
withstand a pressure at least ____ the design
pressure
2 times
3 times
4 times
5 times
a.
b.
c.
d.
Seats and discs shall be limited in distortion,
by pressure or other cause, to set pressure
change of not more than ____ in a span of
five years.
1%
5%
10%
50%
a.
b.
c.
d.
Liquid receivers, if used or parts of a system
designed to receive the refrigerant change
during pumpdown charge. The liquid shall not
occupy more than ____ of the volume when
temperature of the refrigerant is 90F
80%
85%
90%
95%
a.
b.
c.
d.
The discharge line (B4) shall be vented to the
atmosphere through a ____ fitted to its upper
extremity.
Nozzle
Convergent-divergent nozzle
Pipe
Diffuser
a.
b.
c.
d.
Convert fossil fuels into the shaft work
Nuclear power plant
Gas turbine power plant
Dendrothermal power plant
Thermal power plant
a.
b.
c.
d.
Ultimate strength drops by 30% as steam
temperature raises from ____ for unalloyed
steel
300 to 400 c
400 to 500 c
600 to 700 c
700 to 800 c
a.
b.
c.
d.
Recent practice limits steam temperature to
438 c
538 c
648 c
738 c
a.
b.
c.
d.
In a closed feed water heater, the feed water
pass through
Inside the tube
Outside the tube
Inside the shell
Outside the shell
a.
b.
c.
d.
Is use if extracted steam upon condensation
gets subcooled
Trap
Deaerator
Filter
Drain cooler
a.
b.
c.
d.
Needs only single pump regardless of number
of heaters
Open heater
Closed heater
Mono heater
Regenerative heater
a.
b.
c.
d.
Is also known as deaerator
Open heater
Closed heater
Reheat heater
Regenerative heater
a.
b.
c.
d.
Dissolve gases like _____ makes water
corrosive react with metal to form iron oxide
O2 and N2
O2 and CO
O2 and CO2
N2 and SO2