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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+
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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+

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  • August 27, 2024
  • 93
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • FDNY Z51
  • FDNY Z51

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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.


Define superheated vapor. -
....ANSWER...Superheated vapor is, dry vapor above
saturation temperature.


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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