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RETA INDUSTRIAL REFRIGERATION BOOK 1 EXAM
NEWEST 2025 COMPLETE 200 QUESTIONS AND
CORRECT ANSWERS
An advantage of owning a screw compressor over a
reciprocating compressor would be? (pg. 5-15)
A) Higher capacity for footprint of room space taken
B) Higher discharge temperatures
C) Operational maintenance costs over time are eliminated
D) Lower capacity for footprint of room space taken -
ANSWER-A) Higher capacity for footprint of room space
taken
A rotary vane compressor has no significant starting load
because? (pg. 6-13)
A) Rotary vane compressors are cooled by an oil jacket
B) Blades in the compressor form a seal
C) Centrifugal force allows the blades to seal only when the
compressor is up to speed
D) Pumping takes place on start up - ANSWER-C)
Centrifugal force allows the blades to seal only when the
compressor is up to speed
Saturated liquid ammonia at 70°F weights? (pg. 4-9)
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A) 75.47 pounds per cubic foot
B) 0.4315 pounds per cubic foot
C) 38.04 pounds per cubic foot
D) 2.4769 pounds per cubic foot - ANSWER-C) 38.04 pounds
per cubic foot
250 pounds of saturated liquid ammonia at 85°F occupies?
(pg. 4-9)
A) 67.2 cubic feet
B) 109 cubic feet
C) 6.7 cubic feet
D) 450 cubic feet - ANSWER-C) 6.7 cubic feet
(250 lbs. / 37.25 lbs. per cubic foot = 6.7 cubic feet)
What is the purpose of the refrigeration compressor? (pg.
5-2)
A) To draw vapor away from the evaporator at the same
rate it is being generated and to raise the pressure of that
vapor to a point where it can be condensed
B) To superheat the refrigerant gas that is drawn from the
evaporator to insure it is not condensed prior to entering
the condenser
C) To move vaporized refrigerant from the high side to the
low side at the same rate it is being generated and to raise
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the pressure of that vapor to a point where it can be
condensed
D) To provide hot gas to allow for more efficient hot gas
defrost - ANSWER-A) To draw vapor away from the
evaporator at the same rate it is being generated and to
raise the pressure of that vapor to a point where it can be
condensed
How does the refrigeration compressor maintain the
temperature in the system evaporators? (pg. 5-2)
A) Drawing out vaporized refrigerant at a rate to maintain
the desired evaporator pressure
B) Increasing pressure
C) By using liquid injection or thermosiphon cooling
D) Compressors do not maintain evaporator temperatures -
ANSWER-A) Drawing out vaporized refrigerant at a rate to
maintain the desired evaporator pressure
Discharge vapor from all compressors? (pg. 5-
A) Must go directly to a condenser
B) Will contain some level of superheat
C) Must be monitored to insure it does not condense
D) May be subcooled to improve efficiency - ANSWER-B)
Will contain some level of superheat
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The basic idea behind the design of the hermetic
compressor is to avoid? (pg. 5-3)
A) Buying two separate pieces of equipment
B) Slugging
C) Allowing refrigerant to escape to atmosphere from seals
leaking
D) Allowing air into the system if seals leak - ANSWER-C)
Allowing refrigerant to escape to atmosphere from seals
leaking
One reason discharge temperatures are lower on screw
compressors than on reciprocating compressors is because
they? (pg. 5- 17)
A) Use glycol cooling to minimize discharge temperatures
B) Use water cooling to minimize discharge temperatures
C) Use air cooling to minimize discharge temperatures
D) Circulate large amounts of lubricating oil through the
compression chamber - ANSWER-D) Circulate large
amounts of lubricating oil through the compression
chamber
Double acting reciprocating compressors? (pg. 5-10)
RETA INDUSTRIAL REFRIGERATION BOOK 1 EXAM
NEWEST 2025 COMPLETE 200 QUESTIONS AND
CORRECT ANSWERS
An advantage of owning a screw compressor over a
reciprocating compressor would be? (pg. 5-15)
A) Higher capacity for footprint of room space taken
B) Higher discharge temperatures
C) Operational maintenance costs over time are eliminated
D) Lower capacity for footprint of room space taken -
ANSWER-A) Higher capacity for footprint of room space
taken
A rotary vane compressor has no significant starting load
because? (pg. 6-13)
A) Rotary vane compressors are cooled by an oil jacket
B) Blades in the compressor form a seal
C) Centrifugal force allows the blades to seal only when the
compressor is up to speed
D) Pumping takes place on start up - ANSWER-C)
Centrifugal force allows the blades to seal only when the
compressor is up to speed
Saturated liquid ammonia at 70°F weights? (pg. 4-9)
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A) 75.47 pounds per cubic foot
B) 0.4315 pounds per cubic foot
C) 38.04 pounds per cubic foot
D) 2.4769 pounds per cubic foot - ANSWER-C) 38.04 pounds
per cubic foot
250 pounds of saturated liquid ammonia at 85°F occupies?
(pg. 4-9)
A) 67.2 cubic feet
B) 109 cubic feet
C) 6.7 cubic feet
D) 450 cubic feet - ANSWER-C) 6.7 cubic feet
(250 lbs. / 37.25 lbs. per cubic foot = 6.7 cubic feet)
What is the purpose of the refrigeration compressor? (pg.
5-2)
A) To draw vapor away from the evaporator at the same
rate it is being generated and to raise the pressure of that
vapor to a point where it can be condensed
B) To superheat the refrigerant gas that is drawn from the
evaporator to insure it is not condensed prior to entering
the condenser
C) To move vaporized refrigerant from the high side to the
low side at the same rate it is being generated and to raise
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the pressure of that vapor to a point where it can be
condensed
D) To provide hot gas to allow for more efficient hot gas
defrost - ANSWER-A) To draw vapor away from the
evaporator at the same rate it is being generated and to
raise the pressure of that vapor to a point where it can be
condensed
How does the refrigeration compressor maintain the
temperature in the system evaporators? (pg. 5-2)
A) Drawing out vaporized refrigerant at a rate to maintain
the desired evaporator pressure
B) Increasing pressure
C) By using liquid injection or thermosiphon cooling
D) Compressors do not maintain evaporator temperatures -
ANSWER-A) Drawing out vaporized refrigerant at a rate to
maintain the desired evaporator pressure
Discharge vapor from all compressors? (pg. 5-
A) Must go directly to a condenser
B) Will contain some level of superheat
C) Must be monitored to insure it does not condense
D) May be subcooled to improve efficiency - ANSWER-B)
Will contain some level of superheat
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The basic idea behind the design of the hermetic
compressor is to avoid? (pg. 5-3)
A) Buying two separate pieces of equipment
B) Slugging
C) Allowing refrigerant to escape to atmosphere from seals
leaking
D) Allowing air into the system if seals leak - ANSWER-C)
Allowing refrigerant to escape to atmosphere from seals
leaking
One reason discharge temperatures are lower on screw
compressors than on reciprocating compressors is because
they? (pg. 5- 17)
A) Use glycol cooling to minimize discharge temperatures
B) Use water cooling to minimize discharge temperatures
C) Use air cooling to minimize discharge temperatures
D) Circulate large amounts of lubricating oil through the
compression chamber - ANSWER-D) Circulate large
amounts of lubricating oil through the compression
chamber
Double acting reciprocating compressors? (pg. 5-10)
