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FDNY Z51/ WRITTEN Z51 TEST EXAM RECENT VERSION UPDATED WITH ALL 220 QUESTIONS AND DETAILED ANSWERS GRADED A

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FDNY Z51

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FDNY Z51

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: - CORRECT ANSWER️ Lowering the condenser pressure The heat removed from the refrigerant in a condenser is: - CORRECT ANSW...

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the efficiency of the refrigerant cycle is affecte

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FDNY Z51/ WRITTEN Z51 TEST EXAM RECENT
2024- 2026VERSION UPDATED WITH ALL 220
QUESTIONS AND DETAILED ANSWERS
GRADED A

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: - CORRECT ANSWER✔️
Lowering the condenser pressure

The heat removed from the refrigerant in a condenser is: -
CORRECT 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
sultable containers. According to the New York City fire code, you
must ensure that the containers: - CORRECT ANSWER✔️
approved by us department of transportation

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

In most semi Hermetic compressors, the suction vapor is used to:
- CORRECT ANSWER✔️ Cools the motor

,The amount of refrigerant that flows through the orifices of a
economizer is determined by the: - CORRECT ANSWER✔️
Difference between high and low side pressure

The Installation of an Inline refrigerant cleaning system is
advisable: - CORRECT ANSWER✔️ To remove impurities from
the system

The type of refrigerant system that is least likaly to leak refrigerant
into the building space that are being cooled: - CORRECT
ANSWER✔️ The Indirect system

The suction pressure of a reciprocating compressor is 65 PSIG.
The discharge pressure of this compressor is 120 PIG. The
atmospheric is 14.7 PSI. The compression ratio for the given
condition is
closest to: - CORRECT ANSWER✔️ 1.69
Discharge/suction

A superheated vapor is a: - CORRECT 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: - CORRECT ANSWER✔️ A faulty cooling tower water level
controller

,A centrifugal water pump is known as a lift pump when the: -
CORRECT ANSWER✔️ The water supply to the pump suction
inlet is below the pump level

A TXV is used to maintain constant - CORRECT ANSWER✔️
Evaporator superheat

The chilled water supply to the bullding Is 55F. IF the chiller Is
being used for human comfort, should you be concerned about
this, and why? - CORRECT ANSWER✔️ Yes, this temp is too
high for human comfort

The packing gland of a centrifugal pump serves to: - CORRECT
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 - CORRECT ANSWER✔️ Operation of
the hot gas bypass valve

The most important reason to sub-cool the refrigerant in the
condenser is to ensure that: - CORRECT 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. - CORRECT
ANSWER✔️ Malfunction of unloader

, A low side float valve is used to maintain: - CORRECT
ANSWER✔️ The level of the refrigerant in the evaporator

Regarding fire safety, which ASHRAE refrigerant safety
classification Indicates no flammability and lower toxicity? -
CORRECT ANSWER✔️ A1

When an expansion valve is operating property, af the end of the
evaporator will contain: - CORRECT ANSWER✔️ Only
superheated vapor

What Information is not contained in a Material Safety Data
Sheet-MSD5? - CORRECT ANSWER✔️ Cost of material

In a steam turbing, what is the function of the Kingsbury thrust
bearing - CORRECT ANSWER✔️ Maintain first stage steam
pressure

A centrifugal water pump is considered to be fully primed when -
CORRECT 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 -
CORRECT ANSWER✔️ Lever type tubing bender

A reciprocating compressor is making a knocking sound during
operation. If the refrigerant worn parts are not causing the

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Exam (elaborations) ·

Exam (elaborations)

FDNY Z51/ WRITTEN Z51 TEST EXAM RECENT VERSION UPDATED WITH ALL 220 QUESTIONS AND DETAILED ANSWERS GRADED A

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