FDNY Q01/Q99 Written Exam | Most Recent Exam 2026 Actual
Complete Real Exam Questions And Correct Answers
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A reciprocating refrigeration compressor is controlled in
response to the water temperature leaving the water chiller. If
the thermostat is used for compressor control did not have a
wide enough differential, the probable result would be
A) inadequate time for oil to return to the compressor
B) stop on high-pressure cutout
C) stop on low-pressure cutout
D) a very long operating cycle - ANSWER-A) inadequate time for
oil to return to the compressor
Refrigerant recycling is defined as
A) removing the refrigerant from a system and storing it in
an external container with the lowest emissions possible
B) the process of cleaning a refrigerant of dirt and
contaminates such as oil, acids, foreign material and non-
condensibles
C) reprocessing a refrigerant into a new product that can be
reused in another system
,D) all of the above - ANSWER-B) the process of cleaning a
refrigerant of dirt and contaminates such as oil, acids, foreign
material and non-condensibles
What is one reason why the compressor will short cycle? -
ANSWER-Dirt or rust
stuck under the normally closed solenoid valve (dirty
evaporator; clogged filters)
1-ton of refrigeration equals
__________ btu/day
__________ btu/hour
__________ btu/minute
__________ btu/second - ANSWER-1) 288,000 btu/day
2) 12,000 btu/hour
3) 200 btu/minute
4) 2.2 btu/second
Who is responsible in a plant to assure refrigerant
cylinders are within the
hydrostatic test
dates?
A) Operating
engineer
B) Plant
manager
C) Chief
engineer
,D) Owner - ANSWER-D)
Owner
If all of the hydrogen atoms have been replaced in the base
molecule by
chlorine and fluorine, the refrigerant is
said to be
A) fully halogenated
B) partially halogenated
C)
hydrochlorofluorocarbon
D) azeotropic - ANSWER-A) fully
halogenated
Butterfly valve - Where can it be used? - ANSWER-Can be
used on the inlet
and outlet of a water
pump
Which statement is true concerning Ternary Blends?
A) Leak at faster rates than other refrigerants
B) Leak at uneven amounts due to vapor pressures
C) Leak at even rates
D) Leak on the high side due to high pressure - ANSWER-B)
Leak at uneven amounts due to vapor pressures
How many pounds of refrigerant can be stored in a
machine room if the
, machine has 1,000 lbs. in it? -
ANSWER-200
One vertical foot in a riser equals how many psi? - ANSWER-
.433 psi
Sulphur Dioxide —discharged SO2 may be put in a tank of
__________ and not
be used for any other purpose - ANSWER-
Absorptive brine
What is the formula for gallons of water in a pipe? - ANSWER-
2.04 x Diameter2
x
length/50
How much ice does a machine rated at 10 tons produce
in 24 hours? -
ANSWER-A little less that 10
tons of ice
How many watts are equal to one horsepower? - ANSWER-.746
watts
What is the velocity of air in an air duct given the rate of
flow: 340 cfm, 4.5
square foot duct area - ANSWER-
V = Q/A
Complete Real Exam Questions And Correct Answers
(Verified Answers) Already Graded A+ |Guaranteed
Success!! Newest Exam | Just Released!!
A reciprocating refrigeration compressor is controlled in
response to the water temperature leaving the water chiller. If
the thermostat is used for compressor control did not have a
wide enough differential, the probable result would be
A) inadequate time for oil to return to the compressor
B) stop on high-pressure cutout
C) stop on low-pressure cutout
D) a very long operating cycle - ANSWER-A) inadequate time for
oil to return to the compressor
Refrigerant recycling is defined as
A) removing the refrigerant from a system and storing it in
an external container with the lowest emissions possible
B) the process of cleaning a refrigerant of dirt and
contaminates such as oil, acids, foreign material and non-
condensibles
C) reprocessing a refrigerant into a new product that can be
reused in another system
,D) all of the above - ANSWER-B) the process of cleaning a
refrigerant of dirt and contaminates such as oil, acids, foreign
material and non-condensibles
What is one reason why the compressor will short cycle? -
ANSWER-Dirt or rust
stuck under the normally closed solenoid valve (dirty
evaporator; clogged filters)
1-ton of refrigeration equals
__________ btu/day
__________ btu/hour
__________ btu/minute
__________ btu/second - ANSWER-1) 288,000 btu/day
2) 12,000 btu/hour
3) 200 btu/minute
4) 2.2 btu/second
Who is responsible in a plant to assure refrigerant
cylinders are within the
hydrostatic test
dates?
A) Operating
engineer
B) Plant
manager
C) Chief
engineer
,D) Owner - ANSWER-D)
Owner
If all of the hydrogen atoms have been replaced in the base
molecule by
chlorine and fluorine, the refrigerant is
said to be
A) fully halogenated
B) partially halogenated
C)
hydrochlorofluorocarbon
D) azeotropic - ANSWER-A) fully
halogenated
Butterfly valve - Where can it be used? - ANSWER-Can be
used on the inlet
and outlet of a water
pump
Which statement is true concerning Ternary Blends?
A) Leak at faster rates than other refrigerants
B) Leak at uneven amounts due to vapor pressures
C) Leak at even rates
D) Leak on the high side due to high pressure - ANSWER-B)
Leak at uneven amounts due to vapor pressures
How many pounds of refrigerant can be stored in a
machine room if the
, machine has 1,000 lbs. in it? -
ANSWER-200
One vertical foot in a riser equals how many psi? - ANSWER-
.433 psi
Sulphur Dioxide —discharged SO2 may be put in a tank of
__________ and not
be used for any other purpose - ANSWER-
Absorptive brine
What is the formula for gallons of water in a pipe? - ANSWER-
2.04 x Diameter2
x
length/50
How much ice does a machine rated at 10 tons produce
in 24 hours? -
ANSWER-A little less that 10
tons of ice
How many watts are equal to one horsepower? - ANSWER-.746
watts
What is the velocity of air in an air duct given the rate of
flow: 340 cfm, 4.5
square foot duct area - ANSWER-
V = Q/A
