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FDNY Z51 FINAL EXAM 2024 LATEST UPDATED COMPLETE 500 QUESTIONS WITH DETAILED VERIFIED AND 100% CORRECT ANSWERS BRAND NEW EXAM GRADED A+$15.99
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FDNY Z51 FINAL EXAM 2024 LATEST
UPDATED COMPLETE 500
QUESTIONS WITH DETAILED
VERIFIED AND 100% CORRECT
ANSWERS BRAND NEW EXAM
GRADED A+
How many BTU'S per hour is a 30 ton unit? -
....ANSWER...360,00 BTU'S per hour (12,000 BTU'S /
Hour x 30 Tons = 360,00 BTU'S per hour)
How should you charge a liquid using a gauge manifold? -
....ANSWER...High side gauge back seated (open) - Low
side gauge front seated (closed).
When does pressure increase in a 3 stage
centrifugal chiller? - ....ANSWER...Pressure
increases as it reaches the final stage.
In an induced draft cooling tower, what is the lowest
attainable temperature for the cooling tower water?
- ....ANSWER...A temperature higher than the wet bulb
temperature. A lower wet bulb temperature implies that
1
,the air is drier and can hold more water vapor.
What is the maximum temperature setting for a fusible
plug? - ....ANSWER...280 F Degrees.
What is the flash point of compressor lubrication oil?
- ....ANSWER...Higher than the compressor
temperature.
What type of heat is removed from the refrigerant in the
condenser? - ....ANSWER...Sensible and Latent Heat are
removed.
What is a compressor safety head? - ....ANSWER...It is a
valve plate held down by a heavy spring.
What is a centrifugal compressor characterized as?
- ....ANSWER...It is a high volume, low pressure
machine.
If the condenser pressure is high and another pump must
be brought online, how would an RMO properly bring
the pump online? - ....ANSWER...The suction valve is to
2
,be wide open, while the discharge valve is throttled to an
open position.
What would occur if an external equalizer is
disconnected on a TEV? - ....ANSWER...It would
starve the evaporator.
How is capacity control achieved with cylinder unloaders
on a reciprocating compressor? -
....ANSWER...It is achieved by keeping the suction valves
open.
What does a sling psychrometer measure? -
....ANSWER...Relative Humidity.
Define relative humidity. - ....ANSWER...The ratio of
actual water vapor in the atmosphere to the saturation
pressure.
What is the most accurate statement regarding a hermetic
compressor and motor? - ....ANSWER...That it is in a gas
tight housing.
What valve should be avoided to minimize pressure drop?
- ....ANSWER...The globe valve.
3
, What happens when using portable compressor recovery
unit to remove vapor? - ....ANSWER...The vapor density
is decreased.
What is the purpose of an unloader? -
....ANSWER...To decrease capacity (capacity control).
What determines the amount of pressure that flows
through the orifice plates? - ....ANSWER...The difference
in pressure between the high side and the low side of the
system.
4
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