NJ Blue Seal Refrigeration Exam, Most Recent Exam 2025–2026
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How many BTU's are removed from 2000 lbs. of ice at 32 F to
give you ice at 28
F? - ANSWER-32-28 = 4 x .5 = 2 2 x 2000 = 4000
BTU's
Convert 5 degrees F to degrees Rankine - ANSWER-5 F + 460 =
465 R
What type of pump is used to circulate brine through the
system? - ANSWER-
Centrifugal
Which compressor gives the least side thrust when
operating? - ANSWER-A
vertical reciprocating
compressor
During the re-expansion portion of the compression cycle what
is the position of
the suction and discharge valves? - ANSWER-
Both are closed
,What happens to the volumetric efficiency of a
compressor when the
horsepower decreases? - ANSWER-The volumetric
efficiency increases
Why is a horizontal shell and tube heat exchanger than a
vertical? - ANSWER-It
has more than one
pass
With an increased load to the evaporator coil, a TXV will: -
ANSWER-Allow
more refrigerant to enter
the coil
What are the three terminals on a single phase compressor? -
ANSWER-Start,
run,
common
What is the range of the resistance in a compressor
motor winding? -
ANSWER-Between 0-10
ohms
What does the internal overload of a compressor sense? -
ANSWER-Excessive
,amperage in the
compressor motor
What compressor uses a damper to control capacity? -
ANSWER-Centrifugal
compressors
How should properly installed refrigeration lines be
pitched? - ANSWER-
Towards the direction
of flow
Where would you find the greatest possible pressure drop? -
ANSWER-In the
condenser
What type of control is used for loading and unloading
a compressor
automatically? - ANSWER-A
pressure switch
When installing refrigeration lines, when is it recommended to
install oil traps? -
ANSWER-When suction lines rise 8'
or more
The absolute Celsius scale is referred to as: - ANSWER-The
Kelvin scale
, When evaporator pressure goes down: - ANSWER-The load
goes down
What is the formula for total force? - ANSWER-D x D x .7854 x
pressure
What is the total force on a 4" piston with a cylinder pressure
of 100 psig? -
ANSWER-1256.64
lbs
What is the latent heat of vaporization of water? - ANSWER-
970.3 BTU/LB
What is the latent heat of fusion of water? - ANSWER-144
BTU/LB
Why would you pre-cool air in an ice making plant? - ANSWER-
To prevent air
line freeze
up
The counter-flow principle is an important feature of what
type of system? -
ANSWER-Double-piped water cooled
condenser
Change 80 degrees Celsius to degrees Fahrenheit - ANSWER-
80 x 1.8 =144 +
Edition, Actual Complete Real Exam Questions with verified
Answers (100% Correct Answers) Already Graded A+ |
Guaranteed Success!! | Newest Exam | Just Released !!
How many BTU's are removed from 2000 lbs. of ice at 32 F to
give you ice at 28
F? - ANSWER-32-28 = 4 x .5 = 2 2 x 2000 = 4000
BTU's
Convert 5 degrees F to degrees Rankine - ANSWER-5 F + 460 =
465 R
What type of pump is used to circulate brine through the
system? - ANSWER-
Centrifugal
Which compressor gives the least side thrust when
operating? - ANSWER-A
vertical reciprocating
compressor
During the re-expansion portion of the compression cycle what
is the position of
the suction and discharge valves? - ANSWER-
Both are closed
,What happens to the volumetric efficiency of a
compressor when the
horsepower decreases? - ANSWER-The volumetric
efficiency increases
Why is a horizontal shell and tube heat exchanger than a
vertical? - ANSWER-It
has more than one
pass
With an increased load to the evaporator coil, a TXV will: -
ANSWER-Allow
more refrigerant to enter
the coil
What are the three terminals on a single phase compressor? -
ANSWER-Start,
run,
common
What is the range of the resistance in a compressor
motor winding? -
ANSWER-Between 0-10
ohms
What does the internal overload of a compressor sense? -
ANSWER-Excessive
,amperage in the
compressor motor
What compressor uses a damper to control capacity? -
ANSWER-Centrifugal
compressors
How should properly installed refrigeration lines be
pitched? - ANSWER-
Towards the direction
of flow
Where would you find the greatest possible pressure drop? -
ANSWER-In the
condenser
What type of control is used for loading and unloading
a compressor
automatically? - ANSWER-A
pressure switch
When installing refrigeration lines, when is it recommended to
install oil traps? -
ANSWER-When suction lines rise 8'
or more
The absolute Celsius scale is referred to as: - ANSWER-The
Kelvin scale
, When evaporator pressure goes down: - ANSWER-The load
goes down
What is the formula for total force? - ANSWER-D x D x .7854 x
pressure
What is the total force on a 4" piston with a cylinder pressure
of 100 psig? -
ANSWER-1256.64
lbs
What is the latent heat of vaporization of water? - ANSWER-
970.3 BTU/LB
What is the latent heat of fusion of water? - ANSWER-144
BTU/LB
Why would you pre-cool air in an ice making plant? - ANSWER-
To prevent air
line freeze
up
The counter-flow principle is an important feature of what
type of system? -
ANSWER-Double-piped water cooled
condenser
Change 80 degrees Celsius to degrees Fahrenheit - ANSWER-
80 x 1.8 =144 +
