1. What is the primary function of a compressor in a refrigeration system?
o A) Cool the refrigerant
o B) Increase pressure and temperature of refrigerant vapor
o C) Remove moisture from the system
o D) Filter contaminants ANSWER : B
2. What happens to refrigerant in the condenser?
o A) It evaporates
o B) It changes from vapor to liquid
o C) It increases in pressure
o D) It decreases in temperature only ANSWER : B
3. The metering device in a refrigeration system:
o A) Increases refrigerant pressure
o B) Adds heat to the refrigerant
o C) Reduces refrigerant pressure and controls flow
o D) Compresses refrigerant vapor ANSWER : C
4. In which component does the refrigerant absorb heat?
o A) Condenser
o B) Compressor
o C) Evaporator
o D) Receiver ANSWER : C
5. What is superheat?
, o A) Heat added to liquid refrigerant
o B) Heat added to refrigerant vapor above its saturation temperature
o C) Heat removed in the condenser
o D) Temperature of the compressor discharge ANSWER : B
6. What is subcooling?
o A) Cooling vapor below saturation temperature
o B) Cooling liquid refrigerant below its saturation temperature
o C) Cooling the evaporator coil
o D) Reducing compressor temperature ANSWER : B
7. A thermostatic expansion valve (TXV) maintains constant:
o A) Discharge pressure
o B) Condenser temperature
o C) Evaporator superheat
o D) Liquid line pressure ANSWER : C
8. What is the standard temperature for air conditioning comfort cooling?
o A) 65°F
o B) 75°F
o C) 85°F
o D) 95°F ANSWER : B
9. What does a low suction pressure indicate?
o A) Overcharge of refrigerant
o B) Restriction or undercharge
o C) High outdoor temperature
o D) Excessive airflow ANSWER : B
10.The critical temperature of a refrigerant is:
o A) The boiling point at atmospheric pressure
o B) The temperature above which it cannot be liquefied
, o C) The freezing point
o D) The ideal operating temperature ANSWER : B
11.What type of compressor uses scroll technology?
o A) Reciprocating
o B) Rotary
o C) Scroll
o D) Centrifugal ANSWER : C
12.What is the purpose of an accumulator?
o A) Store liquid refrigerant
o B) Prevent liquid refrigerant from entering the compressor
o C) Increase system capacity
o D) Filter refrigerant ANSWER : B
13.A receiver is installed on the:
o A) Suction line
o B) Discharge line
o C) Liquid line
o D) Inside the evaporator ANSWER : C
14.What does CFM stand for?
o A) Cooling Factor Measurement
o B) Cubic Feet per Minute
o C) Condenser Flow Metric
o D) Compressor Function Mode ANSWER : B
15.A crankcase heater prevents:
o A) Overheating of the compressor
o B) Refrigerant migration to the compressor during off cycle
o C) Ice formation on the evaporator
o D) Condenser flooding ANSWER : B
, 16.What is the purpose of a filter drier?
o A) Cool the refrigerant
o B) Remove moisture and contaminants
o C) Regulate refrigerant flow
o D) Increase system pressure ANSWER : B
17.The sight glass is typically located in the:
o A) Suction line
o B) Discharge line
o C) Liquid line
o D) Evaporator ANSWER : C
18.Bubbles in the sight glass may indicate:
o A) Proper charge
o B) Undercharge or restriction
o C) Overcharge
o D) Clean refrigerant ANSWER : B
19.What is the saturation temperature?
o A) Temperature at which phase change occurs at a given pressure
o B) Maximum safe operating temperature
o C) Outdoor ambient temperature
o D) Compressor discharge temperature ANSWER : A
20.A hermetic compressor:
o A) Has an external motor
o B) Motor and compressor sealed in same housing
o C) Uses a belt drive
o D) Requires oil changes every 6 months ANSWER : B
21.What is the ideal superheat range for most systems?
o A) 0-5°F
o A) Cool the refrigerant
o B) Increase pressure and temperature of refrigerant vapor
o C) Remove moisture from the system
o D) Filter contaminants ANSWER : B
2. What happens to refrigerant in the condenser?
o A) It evaporates
o B) It changes from vapor to liquid
o C) It increases in pressure
o D) It decreases in temperature only ANSWER : B
3. The metering device in a refrigeration system:
o A) Increases refrigerant pressure
o B) Adds heat to the refrigerant
o C) Reduces refrigerant pressure and controls flow
o D) Compresses refrigerant vapor ANSWER : C
4. In which component does the refrigerant absorb heat?
o A) Condenser
o B) Compressor
o C) Evaporator
o D) Receiver ANSWER : C
5. What is superheat?
, o A) Heat added to liquid refrigerant
o B) Heat added to refrigerant vapor above its saturation temperature
o C) Heat removed in the condenser
o D) Temperature of the compressor discharge ANSWER : B
6. What is subcooling?
o A) Cooling vapor below saturation temperature
o B) Cooling liquid refrigerant below its saturation temperature
o C) Cooling the evaporator coil
o D) Reducing compressor temperature ANSWER : B
7. A thermostatic expansion valve (TXV) maintains constant:
o A) Discharge pressure
o B) Condenser temperature
o C) Evaporator superheat
o D) Liquid line pressure ANSWER : C
8. What is the standard temperature for air conditioning comfort cooling?
o A) 65°F
o B) 75°F
o C) 85°F
o D) 95°F ANSWER : B
9. What does a low suction pressure indicate?
o A) Overcharge of refrigerant
o B) Restriction or undercharge
o C) High outdoor temperature
o D) Excessive airflow ANSWER : B
10.The critical temperature of a refrigerant is:
o A) The boiling point at atmospheric pressure
o B) The temperature above which it cannot be liquefied
, o C) The freezing point
o D) The ideal operating temperature ANSWER : B
11.What type of compressor uses scroll technology?
o A) Reciprocating
o B) Rotary
o C) Scroll
o D) Centrifugal ANSWER : C
12.What is the purpose of an accumulator?
o A) Store liquid refrigerant
o B) Prevent liquid refrigerant from entering the compressor
o C) Increase system capacity
o D) Filter refrigerant ANSWER : B
13.A receiver is installed on the:
o A) Suction line
o B) Discharge line
o C) Liquid line
o D) Inside the evaporator ANSWER : C
14.What does CFM stand for?
o A) Cooling Factor Measurement
o B) Cubic Feet per Minute
o C) Condenser Flow Metric
o D) Compressor Function Mode ANSWER : B
15.A crankcase heater prevents:
o A) Overheating of the compressor
o B) Refrigerant migration to the compressor during off cycle
o C) Ice formation on the evaporator
o D) Condenser flooding ANSWER : B
, 16.What is the purpose of a filter drier?
o A) Cool the refrigerant
o B) Remove moisture and contaminants
o C) Regulate refrigerant flow
o D) Increase system pressure ANSWER : B
17.The sight glass is typically located in the:
o A) Suction line
o B) Discharge line
o C) Liquid line
o D) Evaporator ANSWER : C
18.Bubbles in the sight glass may indicate:
o A) Proper charge
o B) Undercharge or restriction
o C) Overcharge
o D) Clean refrigerant ANSWER : B
19.What is the saturation temperature?
o A) Temperature at which phase change occurs at a given pressure
o B) Maximum safe operating temperature
o C) Outdoor ambient temperature
o D) Compressor discharge temperature ANSWER : A
20.A hermetic compressor:
o A) Has an external motor
o B) Motor and compressor sealed in same housing
o C) Uses a belt drive
o D) Requires oil changes every 6 months ANSWER : B
21.What is the ideal superheat range for most systems?
o A) 0-5°F
