NATE Air Conditioning Installation &
Service Practice Questions
A good evacuation of a refrigerant circuit to remove non-condensables will help insure:
A.) higher condensing temperatures
B.) higher suction pressures
C.) low suction line pressure drop
D.) higher efficiency and capacity - ✔✔ correct answer D.) higher efficiency and capacity
A condensing unit should be mounted on a slab that is level to:
A.) allow an accumulated water to evenly run out of the cabinet
B.) increase airflow through the fin area
C.) prevent the unit from tipping over
D.) make certain any top discharge air blows straight up - ✔✔ correct answer A.) allow any accumulated
water to evenly run out of the cabinet
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?
A.) Attach the gauge manifold, recover refrigerant, replace the filter core, evacuate the system, recharge
the system.
B.) Recover the refrigerant, evacuate the system, replace the filter core, recharge the system.
C.) Attach the gauge manifold, evacuate the system, replace the filter core, recover the refrigerant,
recharge the system.
D.) Attach the gauge manifold, recharge the system, evacuate the system, replace the filter core. - ✔✔
correct answer A.) Attach the gauge manifold, recover refrigerant, replace the filter core, evacuate the
system, recharge the system.
, NATE Air Conditioning Installation &
Service Practice Questions
As the pressure on the liquid line is increased, the vaporization temperature of the liquid:
A.) decreases
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?
A.) Thermostatic expansion valve
B.) Fixed orifice
C.) Low side float
D.) None of these - ✔✔ correct answer D.) None of these
The purpose of the external equalizer on the 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 flood back
D.) to allow the high side pressure to equalize to the low side when the compressor cycles off - ✔✔
correct answer A.) to equalize evaporator pressure drop with respect to the TEV
The higher the MERV rating of a filter-drier, the
A.) more efficient the drier is at absorbing moisture
B.) less efficient the drier is at absorbing moisture
Service Practice Questions
A good evacuation of a refrigerant circuit to remove non-condensables will help insure:
A.) higher condensing temperatures
B.) higher suction pressures
C.) low suction line pressure drop
D.) higher efficiency and capacity - ✔✔ correct answer D.) higher efficiency and capacity
A condensing unit should be mounted on a slab that is level to:
A.) allow an accumulated water to evenly run out of the cabinet
B.) increase airflow through the fin area
C.) prevent the unit from tipping over
D.) make certain any top discharge air blows straight up - ✔✔ correct answer A.) allow any accumulated
water to evenly run out of the cabinet
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?
A.) Attach the gauge manifold, recover refrigerant, replace the filter core, evacuate the system, recharge
the system.
B.) Recover the refrigerant, evacuate the system, replace the filter core, recharge the system.
C.) Attach the gauge manifold, evacuate the system, replace the filter core, recover the refrigerant,
recharge the system.
D.) Attach the gauge manifold, recharge the system, evacuate the system, replace the filter core. - ✔✔
correct answer A.) Attach the gauge manifold, recover refrigerant, replace the filter core, evacuate the
system, recharge the system.
, NATE Air Conditioning Installation &
Service Practice Questions
As the pressure on the liquid line is increased, the vaporization temperature of the liquid:
A.) decreases
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?
A.) Thermostatic expansion valve
B.) Fixed orifice
C.) Low side float
D.) None of these - ✔✔ correct answer D.) None of these
The purpose of the external equalizer on the 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 flood back
D.) to allow the high side pressure to equalize to the low side when the compressor cycles off - ✔✔
correct answer A.) to equalize evaporator pressure drop with respect to the TEV
The higher the MERV rating of a filter-drier, the
A.) more efficient the drier is at absorbing moisture
B.) less efficient the drier is at absorbing moisture
