HVAC Excellence Refrigeration and
Charging Exam UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
How does a compressor reduce the volume of gas? - CORRECT ANSWER Squeezing
it
How are compressors identified? - CORRECT ANSWER Mechanical parts that
perform the actual pumping of the refrigerant vapor.
What applications apply to choose what type of compressor? - CORRECT
ANSWER 1. Type of refrigerant
2. The tonnage
3. Pressure difference
4. The evaporator
5. Condenser saturation temperature
6. Type of cooling available for the compressor
What are the 2 general operating principle for compressors? - CORRECT
ANSWER Positive displacement and nonpositive displacement
What are some physical enclosure for compressors? - CORRECT ANSWER 1. Open
2. Hermetic
3. Semihermetic
What are some mechanical design for compressors? - CORRECT ANSWER 1.
Reciprocating
2. Rotary
3. Scroll
4. Screw
, 5. Centrifugal
What are some cooling mechanism for compressors? - CORRECT ANSWER 1. Air
2. Water
3. Refrigerant
What is a positive displacement compressor? - CORRECT ANSWER Move gas by
taking it into a space and then replacing that space with something physical like a piston.
What is a nonpositive displacement compressor? - CORRECT ANSWER Do not fill
the gas space with something else. These machines operate like giant fans or turbines turning
at very high speeds.
Nonpositive Displacement Compressors are also known as? - CORRECT
ANSWER Centrifugal compressors
What is an open drive compressor? - CORRECT ANSWER With a separate motor or
drive
What is in a direct drive compressor? - CORRECT ANSWER The motor shaft is
coupled to the compressor shaft and driven at motor speed.
Belt driven machines offer the flexibility of selecting a compressor speed to match the load.
True or False? - CORRECT ANSWER True
What is an advantage of an open drive compressor? - CORRECT ANSWER The motor
and compressor are separate units, so that the motor or compressor can be repaired.
Common use for open compressors? - CORRECT ANSWER Automobile air
conditioning
Charging Exam UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
How does a compressor reduce the volume of gas? - CORRECT ANSWER Squeezing
it
How are compressors identified? - CORRECT ANSWER Mechanical parts that
perform the actual pumping of the refrigerant vapor.
What applications apply to choose what type of compressor? - CORRECT
ANSWER 1. Type of refrigerant
2. The tonnage
3. Pressure difference
4. The evaporator
5. Condenser saturation temperature
6. Type of cooling available for the compressor
What are the 2 general operating principle for compressors? - CORRECT
ANSWER Positive displacement and nonpositive displacement
What are some physical enclosure for compressors? - CORRECT ANSWER 1. Open
2. Hermetic
3. Semihermetic
What are some mechanical design for compressors? - CORRECT ANSWER 1.
Reciprocating
2. Rotary
3. Scroll
4. Screw
, 5. Centrifugal
What are some cooling mechanism for compressors? - CORRECT ANSWER 1. Air
2. Water
3. Refrigerant
What is a positive displacement compressor? - CORRECT ANSWER Move gas by
taking it into a space and then replacing that space with something physical like a piston.
What is a nonpositive displacement compressor? - CORRECT ANSWER Do not fill
the gas space with something else. These machines operate like giant fans or turbines turning
at very high speeds.
Nonpositive Displacement Compressors are also known as? - CORRECT
ANSWER Centrifugal compressors
What is an open drive compressor? - CORRECT ANSWER With a separate motor or
drive
What is in a direct drive compressor? - CORRECT ANSWER The motor shaft is
coupled to the compressor shaft and driven at motor speed.
Belt driven machines offer the flexibility of selecting a compressor speed to match the load.
True or False? - CORRECT ANSWER True
What is an advantage of an open drive compressor? - CORRECT ANSWER The motor
and compressor are separate units, so that the motor or compressor can be repaired.
Common use for open compressors? - CORRECT ANSWER Automobile air
conditioning
