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FDNY Z51 WRITTEN EXAM ACTUAL EXAM 2 VERSIONS (VERSION A AND B) COMPLETE 400 QUESTIONS WITH DETAILED VERIFIED ANSWERS / ALREADY GRADED A+$18.49
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FDNY Z51 WRITTEN EXAM 2024-
2025 ACTUAL EXAM 2 VERSIONS
(VERSION A AND B) COMPLETE 400
QUESTIONS WITH DETAILED
VERIFIED ANSWERS / ALREADY
GRADED A+
While on duty, a refrigerant engineer notices that the
suction line to the compressor and part of the
compressor is frosted. Of the following, the most
likely reason for this condition is
A) the TEV is almost closed.
B) overcharge.
C) there is a blockage in the liquid line
D) low condenser water temperature. -
....ANSWER...B) overcharge.
,You find that the check valve on a centrifugal pump
is leaking. When will the most damage be caused to
the pump?
A) When another pump is turned on.
B) On shutdown.
C) When servicing the pump.
D) On startup. - ....ANSWER...D) On startup.
What is the lowest temperature the water in the
cooling tower can be?
A) Ambient.
B) Between wet and dry bulb.
C) Dry bulb.
D) Wet bulb. - ....ANSWER...B) Between wet and dry
bulb.
The most important reason to subcool the
refrigerant in the condenser is to ensure that
A) liquid slugs will not enter the compressor.
,B) the cooling tower has sufficient water.
C) the condenser is working efficiently.
D) a pure liquid refrigerant will enter the metering
device. - ....ANSWER...D) a pure liquid refrigerant will
enter the metering device.
A chilled water system that has an air cooled
condensing unit on a roof during cold weather has
what type of protection?
A) Glycol running through it.
B) Air-limiting device.
C) Heater coil.
D) Resistor. - ....ANSWER...B) Air-limiting device.
An engineer observes a gauge that reads saturation
pressure of a refrigerant. If chilled water is
circulated as the cooling medium, this reading can
best be used to estimate the
A) chilled water return from building spaces being
pumped to the spaces being cooled.
B) cooling tower efficiency.
, C) pressure of chilled water being pumped to spaces
being cooled.
D) temperature of chilled water being pumped to the
spaces being cooled. - ....ANSWER...D) temperature
of chilled water being pumped to the spaces being
cooled.
The purpose of wear rings in a centrifugal pump is to
A) act as a bearing to reduce axial motion after wear
occurs.
B) prevent wearing of the pump housing and
impeller.
C) center the impeller in the pump casing.
D) minimize water leakage around the shaft. -
....ANSWER...B) prevent wearing of the pump housing
and impeller.
Of the follow, an example of an in-line refrigerant
cleaning system that may be used with a centrifugal
compressor containing R123 refrigerant is:
A) Refrigerant reclaiming.
B) Refrigerant disposal.
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