Z-51 REFRIGERATION TEST (ACTUAL 2024-2026
) QUESTIONS WITH ANSWERS.
Of what characteristics is ASHRAE refrigerant safety group
classification system: - Answers___Flammability and toxicity
Of the following, an example of an in line refrigerant cleaning
system that may be used with a centrifugal compressor
containing R-123 refrigerant is: - Answers___Recycling
Information about the physical and chemical properties of a
hazardous material can be found in: - Answers___Material
Safety Data Sheet
A refrigeration engineer notices excessive cycling of the
temperature control for a reciprocating compressor
refrigeration unit. The crankcase temperature is high, the
compressor discharge temperature is low, the suction line
temperature is high. Of the following, the one that may cause
this set of condition is? - Answers___Faulty compressor
valves
On an operating centrifugal compressor refrigerant unit, the
refrigeration engineer notices that the compressor is short
cycling. The unit is using a low side float valve as a metering
device. Of the following requirements, this would indicate
that: - Answers___The system is undercharged with
refrigerant
The vessel depicted below may used in connection with -
Answers___Refrigerant recovery
,Z-51 REFRIGERATION TEST (ACTUAL 2024-2026
) QUESTIONS WITH ANSWERS.
A refrigeration system uses jet ejector to raise settled oil
mixed with refrigerant to the oil pump. If a restriction in the
refrigerant flow to the jet ejector develops: -
Answers___There may be insufficient head to lift the oil
An indirect, low temperature refrigerant system frequently
uses glycol, instead of salt brine as the intermediate cooling
medium. An advantage of this choice is: - Answers___The
elimination of corrosion
In relation to the suction pressure of a compressor, the reading
on the oil pressure guage should read in the range, closer to: -
Answers___15 to 30 PSI higher
Non-condensable gases like air, oil vapor, or nitrogen travel
through a refrigerant system with the refrigerant they usually
accumulate in the: - Answers___Condenser
The advantage of forced draft cooling tower over natural draft
cooling towers is: - Answers___Smaller tower size
The sole refrigeration engineer on duty in a building is
permitted to leave the building refrigeration system when it is
in operation only when: - Answers___Relieved by another
licensed refrigeration engineer
,Z-51 REFRIGERATION TEST (ACTUAL 2024-2026
) QUESTIONS WITH ANSWERS.
A system controlled by a TXV shows high discharge pressure
and high normal subcooling. The cause is most probably a: -
Answers___Refrigerant overcharge
Which of the following is a correct statement? -
Answers___2.5 gallons of water weighs 20.8 pounds
Liquid level gauge glasses (except the bull's eye) are generally
equipped with: - Answers___Automatic shut off valves only
Copper and aluminum are frequently used for condenser tubes
in refrigeration system. These metals are used because of
their: - Answers___High heat transfer coefficient
Assume that a refrigeration engineer has a choice of four
valves to select from. Which of the following is the most
effective type of valve to control pressure? - Answers___Plug
valve
Where must the Material Safety Data Sheets be located? -
Answers___Where available to all employees
The oil collected in an oil separator is generally: -
Answers___Returned to the compressor
, Z-51 REFRIGERATION TEST (ACTUAL 2024-2026
) QUESTIONS WITH ANSWERS.
What is the function of gland steam? - Answers___Seal the
turbine rotor carbon rings
Regarding the functioning of steam turbine, how is the water
level controlled in the surface condenser hot well? -
Answers___Operation of the recirculation and overboard
valves
The cause of the starved evaporator might be: -
Answers___Low refrigerant charge
A refrigeration engineer is running two centrifugal condenser
water pumps in parallel. One of the pumps is at it's maximum
pumping rate. If by mistake, the refrigeration engineer
throttles back on the discharge valve of the other pump, the
most likely effect will be: - Answers___A reduction on the
total flow rate to the condenser
The total amount of heat to be removed from the refrigerant in
a condenser equals the heat picked up in the: -
Answers___Evaporator plus the heat of compression
The amount of electrical power used to operate a solenoid
valve or a motor is measured in: - Answers___Volts
) QUESTIONS WITH ANSWERS.
Of what characteristics is ASHRAE refrigerant safety group
classification system: - Answers___Flammability and toxicity
Of the following, an example of an in line refrigerant cleaning
system that may be used with a centrifugal compressor
containing R-123 refrigerant is: - Answers___Recycling
Information about the physical and chemical properties of a
hazardous material can be found in: - Answers___Material
Safety Data Sheet
A refrigeration engineer notices excessive cycling of the
temperature control for a reciprocating compressor
refrigeration unit. The crankcase temperature is high, the
compressor discharge temperature is low, the suction line
temperature is high. Of the following, the one that may cause
this set of condition is? - Answers___Faulty compressor
valves
On an operating centrifugal compressor refrigerant unit, the
refrigeration engineer notices that the compressor is short
cycling. The unit is using a low side float valve as a metering
device. Of the following requirements, this would indicate
that: - Answers___The system is undercharged with
refrigerant
The vessel depicted below may used in connection with -
Answers___Refrigerant recovery
,Z-51 REFRIGERATION TEST (ACTUAL 2024-2026
) QUESTIONS WITH ANSWERS.
A refrigeration system uses jet ejector to raise settled oil
mixed with refrigerant to the oil pump. If a restriction in the
refrigerant flow to the jet ejector develops: -
Answers___There may be insufficient head to lift the oil
An indirect, low temperature refrigerant system frequently
uses glycol, instead of salt brine as the intermediate cooling
medium. An advantage of this choice is: - Answers___The
elimination of corrosion
In relation to the suction pressure of a compressor, the reading
on the oil pressure guage should read in the range, closer to: -
Answers___15 to 30 PSI higher
Non-condensable gases like air, oil vapor, or nitrogen travel
through a refrigerant system with the refrigerant they usually
accumulate in the: - Answers___Condenser
The advantage of forced draft cooling tower over natural draft
cooling towers is: - Answers___Smaller tower size
The sole refrigeration engineer on duty in a building is
permitted to leave the building refrigeration system when it is
in operation only when: - Answers___Relieved by another
licensed refrigeration engineer
,Z-51 REFRIGERATION TEST (ACTUAL 2024-2026
) QUESTIONS WITH ANSWERS.
A system controlled by a TXV shows high discharge pressure
and high normal subcooling. The cause is most probably a: -
Answers___Refrigerant overcharge
Which of the following is a correct statement? -
Answers___2.5 gallons of water weighs 20.8 pounds
Liquid level gauge glasses (except the bull's eye) are generally
equipped with: - Answers___Automatic shut off valves only
Copper and aluminum are frequently used for condenser tubes
in refrigeration system. These metals are used because of
their: - Answers___High heat transfer coefficient
Assume that a refrigeration engineer has a choice of four
valves to select from. Which of the following is the most
effective type of valve to control pressure? - Answers___Plug
valve
Where must the Material Safety Data Sheets be located? -
Answers___Where available to all employees
The oil collected in an oil separator is generally: -
Answers___Returned to the compressor
, Z-51 REFRIGERATION TEST (ACTUAL 2024-2026
) QUESTIONS WITH ANSWERS.
What is the function of gland steam? - Answers___Seal the
turbine rotor carbon rings
Regarding the functioning of steam turbine, how is the water
level controlled in the surface condenser hot well? -
Answers___Operation of the recirculation and overboard
valves
The cause of the starved evaporator might be: -
Answers___Low refrigerant charge
A refrigeration engineer is running two centrifugal condenser
water pumps in parallel. One of the pumps is at it's maximum
pumping rate. If by mistake, the refrigeration engineer
throttles back on the discharge valve of the other pump, the
most likely effect will be: - Answers___A reduction on the
total flow rate to the condenser
The total amount of heat to be removed from the refrigerant in
a condenser equals the heat picked up in the: -
Answers___Evaporator plus the heat of compression
The amount of electrical power used to operate a solenoid
valve or a motor is measured in: - Answers___Volts
