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CURRENTLY TESTING Z-51 REFRIGERATION EXAM QUESTIONS WITH ACTUAL CORRECT DETAILED ANSWERS

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CURRENTLY TESTING Z-51 REFRIGERATION EXAM QUESTIONS WITH ACTUAL CORRECT DETAILED ANSWERS CURRENTLY TESTING Z-51 REFRIGERATION EXAM QUESTIONS WITH ACTUAL CORRECT DETAILED ANSWERS CURRENTLY TESTING Z-51 REFRIGERATION EXAM QUESTIONS WITH ACTUAL CORRECT DETAILED ANSWERS CURRENTLY TESTING Z-...

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  • September 23, 2024
  • 23
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • z 51 refrigeration exam questio
  • currently testing z 51 refrigeration
  • currently testing z 51 refrigeration uestio

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CURRENTLY TESTING Z-51 REFRIGERATION EXAM
QUESTIONS WITH ACTUAL CORRECT DETAILED
ANSWERS




Efficiency of the refrigerant cycle is affected by the operations of the condenser. Of the following, a more
efficient centrifugal compressor operation results from: - ANSWER-Lowering the condensing 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 NYC Fire
Code, you must ensure that the containers: - ANSWER-Are approved by the US Dept. of Transportation



Which of the following best describes how the cylinder unloader works? - ANSWER-Keep in the suction
valve opened while the compressor is in the return stroke



In most semi-hermetic compressors, the suction vapor is used to: - ANSWER-Cool the motor



The amount of refrigerant that flows through the orifices of an economizer is determined by the: -
ANSWER-Differences 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-Indirect system



The suction pressure of a reciprocating compressor is 65 PSIG. The discharge pressure of this compressor
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: - 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 55 deg F. If the chiller is being used for human comfort, should
you be concerned about this, and why? - ANSWER-Yes, this temp 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 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 readings 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 too 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 indicates 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? - ANSWER-Cost of the material



In a steam turbine, what is the function of the Kingsbury thrust bearing? - ANSWER-Maintain axial
positioning of the rotor shaft



A centrifugal water pump is considered to the fully primed when? - ANSWER-The pump is full of liquid



Copper tubing refrigerant lines must be installed for a new system. It is a well known service practice
that tubing collapses at bends that must be made, the refrigerant engineer should use? - ANSWER-Level
type tubing bender



A reciprocating compressor is making a knocking sound during operation. If the refrigerant worn parts
are not causing the knocking, what probably the cause? - ANSWER-Slugging of the liquid refrigerant



In order for a refrigerant to become superheated, it must be heated in a section of the low side
refrigerant line: - ANSWER-Where no liquid refrigerant is present



All liquid has been recovered from a system to be overhauled, the system: - ANSWER-Should not be
opened until all vapor has been recovered

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