GCAP INDUSTRIAL AMMONIA
REFRIGERATION ACTUAL EXAM PAPER
2026 QUESTIONS WITH ANSWERS
GRADED A+
◍ Which of these is NOT a factor of heat transfer?A) Temperature
DifferenceB) Density of MaterialC) Thermal ConductivityD) Surface Area.
Answer: B) Density of Material
◍ What is causing the following changes in this DX system?Suction Header
Pressure- 38 PSIG --> 38PSIGSuction Header Temperature- 37°F -->
24°FCompressor Inlet Pressure- 33 PSIG --> 33 PSIGCompressor Inlet
Temperature- 42°F --> 24°FCompressor Discharge Pressure- 154 PSIG -->
154PSIGCompressor Discharge Temperature- 215°F --> 135°F.
Answer: An increase of liquid feed supply to the evaporator
◍ What is Entropy?A) A simpler understanding of EnthalpyB) A measurement
of heat of compressionC) A measurement of Flash/Tax GasD) There is no
such thing as Entropy in the understanding of Enthalpy Diagram.
Answer: B) A measurement of heat of compression
◍ The two boundary lines separating the SAT region from the superheat and
subcooled can be considered?A) The left river boundary line is 100% SAT
Liquid and the right river boundary line is 100% SAT GasB) The left river
boundary line is 100% SAT Gas and the right river boundary line is 100%
SAT LiquidC) Represents Flash/Tax GasD) Represents Theoretical
Discharge Temperature.
Answer: A) The left river boundary line is 100% SAT Liquid and the right
river boundary line is 100% SAT Gas
,◍ Which of the following can lead to flooding out the plant in a recirculated
system?A) Over-adjusting metering valvesB) Mismanaged liquid delivery
when compressors turn offC) Thermostats set below SAT temperatureD) All
of the above.
Answer: D) All of the above
◍ You have an Ammonia liquid line with a temperature of 20°F and 33 PSIG.
After the adjustment valve it is -25°F and 1 PSIG. What would you name
the valve you are adjusting?A) Stop ValveB) Solenoid ValveC) Metering
ValveD) Expansion Valve.
Answer: D) Expansion Valve (due to drop in temperature and pressure)
◍ Given the following, how much superheat is found on the outlet of the
evaporator?Suction Header Pressure- 38 PSIG Suction Header Temperature-
50°FCompressor Inlet Pressure- 27 PSIG Compressor Inlet Temperature-
55°FCompressor Discharge Press- 140 PSIG Compressor Discharge Temp-
265°FA) 13°FB) 20°FC) 26°FD) 42°F.
Answer: Use suction header pressure and temperature(38 PSIG evaporates at
24°F)Superheat = actual temp - SAT tempSuperheat = 50°F - 24°F = 26°F
of Superheat
◍ In a pumper drum system, when one drum is filling from the LPR, what is
the opposite drums operational function?A) Filling from the LPRB)
Transferring its liquid into the recirculation headerC) Waiting on response
from the sensing bulb on the TXVD) Waiting on contacts from the
High-Level float of the LPR to activate.
Answer: B) Transferring its liquid into the recirculation header(emptying out
to the system)
◍ What is compound compression?.
Answer: Compound compression is two stages of compression happening
within one compressor package driven off of the same motor
◍ Which of the following does NOT happen when the load is increased on a
DX evaporator using a TXV?A) The boiling rate increasesB) The rate of
building gas increasesC) The pressure in the suction pipe will rise if the
, compressor cannot move the extra gas that is generatedD) The TXV will
respond by reducing the liquid refrigerant flow rate to the evaporator.
Answer: D) The TXV will respond by reducing the liquid refrigerant flow
rate to the evaporator
◍ In a pumper drum system, how is the liquid refrigerant removed from the
transfer drum into the recirculation header?A) Evaporator PressureB)
Suction PressureC) High-Pressure GasD) Liquids Pumps.
Answer: C) High-Pressure Gas
◍ When is a 3-way with dual relief valves required for pressure protection?.
Answer: Protecting locations with greater than 10ft3 of internal space
require the 3-way with duals
◍ T of F?At any given constant, as Dry Bulb Temperature and Relative
Humidity go up, all other variables will increase as well..
Answer: True
◍ Which of the following is NOT true regarding suction line accumulators?A)
They may be emptied by allowing the liquid to evaporate by the heat
transfer from the HPL sub-cooling coil internallyB)They may be emptied by
pumpsC) They may be emptied by a pumper drumD) They are intended to
maintain a constant liquid level and do not need to be emptied.
Answer: D) They are intended to maintain a constant liquid level and do not
need to be emptied
◍ To keep a flooded oil pot design working continuously what must be
allowed to be applied to the pot continuously?A) MoistureB) IceC) HeatD)
Bubbles.
Answer: C) Heat
◍ The flooded evaporator has fluctuating recirculation rates due to?A) The
expansion valve set pointB) The metering valve set pointC) The heat load
induced into the heat exchangerD) The pump differential pressure.
Answer: C) The heat load induced into the heat exchanger
◍ If one wanted a slightly overfed DX evaporator that incorporated a suction
, line accumulator, what metering device could NOT be used?A) Hand
ExpansionB) Thermostatic ExpansionC) Automatic ExpansionD) None of
the above.
Answer: B) Thermostatic Expansion (TXV)
◍ What is the only defrost process that turns the evaporator into a
condenser?A) Air DefrostB) Electric DefrostC) Water DefrostD) Gas
Defrost.
Answer: D) Gas Defrost
◍ In a two stage system, what would one find to be the visual appearance of
the compressors and motors?.
Answer: The boosters (low stage) compressors would be larger compressors
than the high stage compressors (CFM) and have smaller HP motors than
the high stage compressors
◍ Where in an ammonia absorption system would you find the strong liquor?.
Answer: In the generator
◍ Which evaporator design must incorporate the four-pipe defrost design is
using gas defrost?.
Answer: DX
◍ "Where in an ammonia absorber, would you find the weak liquor?".
Answer: In the absorber
◍ What is the Dry Bulb Temperature when given the following?Wet Bulb
Temperature- 75°F Relative Humidity- 100%A) 75°FB) 85°FC) 95°FD)
105°F.
Answer: Dry Bulb = 75°F
◍ Why is there no flash/tax gas across a metering valve?A) Because there is
not pressure dropB) Because there is no temperature dropC) Because there
is no velocity increaseD) All of the above.
Answer: B) Because there is no temperature drop
◍ For a flooded system to work properly in operation, it must be? (Feed &
REFRIGERATION ACTUAL EXAM PAPER
2026 QUESTIONS WITH ANSWERS
GRADED A+
◍ Which of these is NOT a factor of heat transfer?A) Temperature
DifferenceB) Density of MaterialC) Thermal ConductivityD) Surface Area.
Answer: B) Density of Material
◍ What is causing the following changes in this DX system?Suction Header
Pressure- 38 PSIG --> 38PSIGSuction Header Temperature- 37°F -->
24°FCompressor Inlet Pressure- 33 PSIG --> 33 PSIGCompressor Inlet
Temperature- 42°F --> 24°FCompressor Discharge Pressure- 154 PSIG -->
154PSIGCompressor Discharge Temperature- 215°F --> 135°F.
Answer: An increase of liquid feed supply to the evaporator
◍ What is Entropy?A) A simpler understanding of EnthalpyB) A measurement
of heat of compressionC) A measurement of Flash/Tax GasD) There is no
such thing as Entropy in the understanding of Enthalpy Diagram.
Answer: B) A measurement of heat of compression
◍ The two boundary lines separating the SAT region from the superheat and
subcooled can be considered?A) The left river boundary line is 100% SAT
Liquid and the right river boundary line is 100% SAT GasB) The left river
boundary line is 100% SAT Gas and the right river boundary line is 100%
SAT LiquidC) Represents Flash/Tax GasD) Represents Theoretical
Discharge Temperature.
Answer: A) The left river boundary line is 100% SAT Liquid and the right
river boundary line is 100% SAT Gas
,◍ Which of the following can lead to flooding out the plant in a recirculated
system?A) Over-adjusting metering valvesB) Mismanaged liquid delivery
when compressors turn offC) Thermostats set below SAT temperatureD) All
of the above.
Answer: D) All of the above
◍ You have an Ammonia liquid line with a temperature of 20°F and 33 PSIG.
After the adjustment valve it is -25°F and 1 PSIG. What would you name
the valve you are adjusting?A) Stop ValveB) Solenoid ValveC) Metering
ValveD) Expansion Valve.
Answer: D) Expansion Valve (due to drop in temperature and pressure)
◍ Given the following, how much superheat is found on the outlet of the
evaporator?Suction Header Pressure- 38 PSIG Suction Header Temperature-
50°FCompressor Inlet Pressure- 27 PSIG Compressor Inlet Temperature-
55°FCompressor Discharge Press- 140 PSIG Compressor Discharge Temp-
265°FA) 13°FB) 20°FC) 26°FD) 42°F.
Answer: Use suction header pressure and temperature(38 PSIG evaporates at
24°F)Superheat = actual temp - SAT tempSuperheat = 50°F - 24°F = 26°F
of Superheat
◍ In a pumper drum system, when one drum is filling from the LPR, what is
the opposite drums operational function?A) Filling from the LPRB)
Transferring its liquid into the recirculation headerC) Waiting on response
from the sensing bulb on the TXVD) Waiting on contacts from the
High-Level float of the LPR to activate.
Answer: B) Transferring its liquid into the recirculation header(emptying out
to the system)
◍ What is compound compression?.
Answer: Compound compression is two stages of compression happening
within one compressor package driven off of the same motor
◍ Which of the following does NOT happen when the load is increased on a
DX evaporator using a TXV?A) The boiling rate increasesB) The rate of
building gas increasesC) The pressure in the suction pipe will rise if the
, compressor cannot move the extra gas that is generatedD) The TXV will
respond by reducing the liquid refrigerant flow rate to the evaporator.
Answer: D) The TXV will respond by reducing the liquid refrigerant flow
rate to the evaporator
◍ In a pumper drum system, how is the liquid refrigerant removed from the
transfer drum into the recirculation header?A) Evaporator PressureB)
Suction PressureC) High-Pressure GasD) Liquids Pumps.
Answer: C) High-Pressure Gas
◍ When is a 3-way with dual relief valves required for pressure protection?.
Answer: Protecting locations with greater than 10ft3 of internal space
require the 3-way with duals
◍ T of F?At any given constant, as Dry Bulb Temperature and Relative
Humidity go up, all other variables will increase as well..
Answer: True
◍ Which of the following is NOT true regarding suction line accumulators?A)
They may be emptied by allowing the liquid to evaporate by the heat
transfer from the HPL sub-cooling coil internallyB)They may be emptied by
pumpsC) They may be emptied by a pumper drumD) They are intended to
maintain a constant liquid level and do not need to be emptied.
Answer: D) They are intended to maintain a constant liquid level and do not
need to be emptied
◍ To keep a flooded oil pot design working continuously what must be
allowed to be applied to the pot continuously?A) MoistureB) IceC) HeatD)
Bubbles.
Answer: C) Heat
◍ The flooded evaporator has fluctuating recirculation rates due to?A) The
expansion valve set pointB) The metering valve set pointC) The heat load
induced into the heat exchangerD) The pump differential pressure.
Answer: C) The heat load induced into the heat exchanger
◍ If one wanted a slightly overfed DX evaporator that incorporated a suction
, line accumulator, what metering device could NOT be used?A) Hand
ExpansionB) Thermostatic ExpansionC) Automatic ExpansionD) None of
the above.
Answer: B) Thermostatic Expansion (TXV)
◍ What is the only defrost process that turns the evaporator into a
condenser?A) Air DefrostB) Electric DefrostC) Water DefrostD) Gas
Defrost.
Answer: D) Gas Defrost
◍ In a two stage system, what would one find to be the visual appearance of
the compressors and motors?.
Answer: The boosters (low stage) compressors would be larger compressors
than the high stage compressors (CFM) and have smaller HP motors than
the high stage compressors
◍ Where in an ammonia absorption system would you find the strong liquor?.
Answer: In the generator
◍ Which evaporator design must incorporate the four-pipe defrost design is
using gas defrost?.
Answer: DX
◍ "Where in an ammonia absorber, would you find the weak liquor?".
Answer: In the absorber
◍ What is the Dry Bulb Temperature when given the following?Wet Bulb
Temperature- 75°F Relative Humidity- 100%A) 75°FB) 85°FC) 95°FD)
105°F.
Answer: Dry Bulb = 75°F
◍ Why is there no flash/tax gas across a metering valve?A) Because there is
not pressure dropB) Because there is no temperature dropC) Because there
is no velocity increaseD) All of the above.
Answer: B) Because there is no temperature drop
◍ For a flooded system to work properly in operation, it must be? (Feed &
