FDNY Z51 FINAL EXAM 2024 ACTUAL
EXAM 2 VERSIONS COMPLETE 500
QUESTIONS WITH DETAILED
VERIFIED ANSWERS (100% CORRECT
ANSWERS) / ALREADY GRADED A+
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.
,How can you check proper operation of a
thermometer? - ....ANSWER...Local 94 answer -
Place it in a container with ice water.
How many phases will a 3 HP motor use? -
....ANSWER...3 Phases.
If you were running 3 compressors what would the
state of the refrigerant be leaving the 3rd evaporator
coil? - ....ANSWER...It would be a slightly
superheated vapor.
What does a TEV do? - ....ANSWER...It restricts the
amount of refrigerant that flows from the high side
to the low side.
When does a halide torch turn from blue to green or
purple? - ....ANSWER...When a leak is detected.
What does a rectifier do? - ....ANSWER...It converts
AC voltage to DC voltage.
,What is the function of a thermostat? -
....ANSWER...It's purpose is to cycle the compressor
on and off.
What is the main purpose for a crankcase breather
line? - ....ANSWER...The main purpose is to prevent
oil from slugging the compressor.
Where can the middle port on manifold gauges be
connected to? - ....ANSWER...It can be connected to
the recovery machine, charging cylinder or vacuum
pump.
Why is a forced draft cooling tower better than a
natural draft cooling tower? - ....ANSWER...Because
it is smaller and it is not affected by prevailing
winds.
What should an RMO do after recovering as a liquid
when attempting to open the chiller for servicing? -
....ANSWER...You should next, recover as a vapor and
then proceed to open the chiller for servicing.
, What is the proper way to start up a pump? -
....ANSWER...Open the suction valve and then slowly
throttle open the discharge.
What form of energy do Solenoid valves create? -
....ANSWER...A magnetic field of energy.
What pressure is R-22 at 38 degrees on a PT chart?
- ....ANSWER...65.6 PSI.
What does the chillers purge unit do? -
....ANSWER...It removes air and non-condensible's
from the condenser.
What can overcharge of refrigerant cause? -
....ANSWER...High discharge pressure.
A sling psychrometer has both wet and dry bulb
temperatures, if both temperatures are the same
what would this indicate? - ....ANSWER...100% relative
humidity.
What is the purpose of the swirler at the top of a
water box in a vertical shell and tube condenser? -
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