The efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the following, a more efficient centrifugal compressor operation results from: - ANSWER Lowering the condenser pressure
The heat removed from the refrigerant in a condenser is: - ANSWER Sensible and latent ...
NYC Refrigeration License
Exam I 100% CORRECT
The efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the following, a
more efficient centrifugal compressor operation results from: - ANSWER Lowering the condenser
pressure
The heat removed from the refrigerant in a condenser is: - ANSWER Sensible and latent heat
The refrigerant unit that you have been assigned to is being taken out of service for a major repair. You
have been assigned to withdraw refrigerant for storage in suitable containers. According to the New York
City fire code, you must ensure the containers: - ANSWER Are approved by the US Department of
Transportation
Which of the following best describes how the cylinder unloader works? - ANSWER Keep the suction
valve opened while the compressor is in the return stroke
In most semi hermetic compressors, the suction vapor is used to: - ANSWER Cools the motor
The amount of refrigerant that flows through the orifices of an economizer is determined by the: -
ANSWER Difference between the high side and low side pressure
The installation of an inline refrigerant cleaning system is advisable: - ANSWER To remove impurities
from the system
The type of refrigerant system that is least likely to leak refrigerant into the building space that are being
cooled: - ANSWER The indirect system
The suction pressure of a reciprocating compressor is 65 PSIG. The discharge pressure is 120 PSIG. The
atmospheric is 14.7 PSI. The compression ratio for the given condition is closest to: - ANSWER 1.69
, A superheated vapor is a: - ANSWER Dry vapor above the saturation temperature
A refrigerant engineer verifies that a condenser water pump is cavitating. Of the following the most likely
cause for this condition is: - ANSWER A faulty cooling tower water level controller
A centrifugal water pump is known as a lift pump when the: - ANSWER The water supply to the pump
suction inlet is below the pump level
A TXV is used to maintain constant: - ANSWER Evaporator superheat
The chilled water supply to the building is 55F. If the chiller is being used for human comfort, should you
be concerned about this and why? - ANSWER Yes, this temperature is too high for human comfort
purposes
The packing gland of a centrifugal pump serves to: - ANSWER The drip part of the packing gland gives
evidence that there is water in the pump
Capacity control of a reciprocating hermetic compressor is typically achieved through - ANSWER
Operation of the hot gas bypass valve
The most important reason to sub-cool the refrigerant in the condenser is to ensure that: - ANSWER A
pure liquid refrigerant will enter the metering device
A refrigeration engineer is logging reading from a reciprocating system. Compressor discharge
temperature have dropped significantly and the suction line pressure is high. Which of the following that
may be causing this set of condition? - ANSWER An expansion valve that is open to wide
A low side float valve is used to maintain: - ANSWER The level of the refrigerant in the evaporator
Regarding fire safety, which ASHRAE refrigerant safety classification indicated no flammability and lower
toxicity? - ANSWER A1
, When an expansion valve is operating properly, at the end of the evaporator will contain: - ANSWER Only
superheated vapor
What information is not contained in a Material Safety Data Sheet-MSDS? - ANSWER Cost of the material
Refrigerants are characterized by their physical properties included flashpoint, refrigeration effect, and
others. Of the refrigerants in commercial and industrial the highest latent heat and refrigerant effect is: -
ANSWER Ammonia
On what characteristics is ASHRAE refrigerant safety group classification system: - ANSWER Flammability
and toxicity
Of the following, an example of an in-line refrigerant cleaning system that may be used with a centrifugal
compressor containing R123 refrigerant is: - ANSWER Refrigerant recycling
Information about the physical and chemical properties of a hazardous material can be found in: -
ANSWER Material Safety Data Sheet
What is the function of the turbine auxiliary oil pump? - ANSWER Establish oil pressure during turbine
start up
The rupture disc for a low-pressure centrifugal refrigeration machine is normally located on the: -
ANSWER Compressor suction
What is the primary reason ribbed metal piping is used for electrical wires connected to the refrigeration
system shown below? - ANSWER It allows for flexibility and accounts for vibration
A multi-cylinder reciprocating compressor uses cylinder unloaders to regulate capacity, what would not
occur if some of the unloaders fail to operate when needed? - ANSWER The chilled water temperature
will increase
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