NATE A/C EXAM #1 STUDY
GUIDE QUESTIONS AND ANSWERS
GRADED A+
Low airflow over a residential split system air conditioning evaporator can cause
A: Liquid flood-back to the compressor
B: A decrease in compression ratio
C: An increase in suction line superheat
D: Oil logging in the evaporator - Correct answer-A: Liquid flood-back to the
compressor
Which of the following is the correct sequence of work?
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,A: Attach gauge manifold, recover refrigerant, replace filter core, evacuate the
system, recharge the system.
B: Recover refrigerant, evacuate the system, replace filter core, recharge the
system.
C: Attach gauge manifold, evacuate the system, replace filter core, recover
refrigerant, recharge the system.
D: Attach gauge manifold, recharge the system, evacuate the system, replace filter
core. - Correct answer-A: Attach gauge manifold, recover refrigerant, replace filter
core, evacuate the system, recharge the system.
As the pressure on a liquid is increased, the vaporization temperature of the liquid
A: Decreases
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,B: Increases
C: Remains unchanged
D: Varies - Correct answer-B: Increases
An oil separator must be mounted
A: Level
B: Below the compressor crankcase
C: Above the compressor crankcase
D: In the suction line - Correct answer-A: Level
Which of the following metering devices controls evaporator pressure?
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, A: Thermostatic expansion valve
B: Fixed orifice
C: Low side float
D: None of these - Correct answer-D: None of these
An automatic expansion valve controls evaporator pressure.
The purpose of the external equalizer on a thermostatic expansion valve is
A: To equalize evaporator pressure drop with respect to the TEV
B: To equalize the evaporator pressure drop
C: To help prevent liquid floodback
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GUIDE QUESTIONS AND ANSWERS
GRADED A+
Low airflow over a residential split system air conditioning evaporator can cause
A: Liquid flood-back to the compressor
B: A decrease in compression ratio
C: An increase in suction line superheat
D: Oil logging in the evaporator - Correct answer-A: Liquid flood-back to the
compressor
Which of the following is the correct sequence of work?
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,A: Attach gauge manifold, recover refrigerant, replace filter core, evacuate the
system, recharge the system.
B: Recover refrigerant, evacuate the system, replace filter core, recharge the
system.
C: Attach gauge manifold, evacuate the system, replace filter core, recover
refrigerant, recharge the system.
D: Attach gauge manifold, recharge the system, evacuate the system, replace filter
core. - Correct answer-A: Attach gauge manifold, recover refrigerant, replace filter
core, evacuate the system, recharge the system.
As the pressure on a liquid is increased, the vaporization temperature of the liquid
A: Decreases
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,B: Increases
C: Remains unchanged
D: Varies - Correct answer-B: Increases
An oil separator must be mounted
A: Level
B: Below the compressor crankcase
C: Above the compressor crankcase
D: In the suction line - Correct answer-A: Level
Which of the following metering devices controls evaporator pressure?
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, A: Thermostatic expansion valve
B: Fixed orifice
C: Low side float
D: None of these - Correct answer-D: None of these
An automatic expansion valve controls evaporator pressure.
The purpose of the external equalizer on a thermostatic expansion valve is
A: To equalize evaporator pressure drop with respect to the TEV
B: To equalize the evaporator pressure drop
C: To help prevent liquid floodback
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