NATE Exam AC & HP CONSISTS 252 CORRECT QUESTIONS AND
ANSWERS/ LATEST UPDATE WITH SOME PRACTICE EXAM IN IT (North
American Technician Excellence) 2024 GRADED A+
Charging a heat pump with refrigerant is best accomplished in the _______ mode.
A: Heating mode
B: Cooling mode
C: Defrost mode
D: Emergency heating mode - CORRECT ANSWER B: Cooling mode
Heat pumps can provide both heating in the winter and cooling in the summer. In which
mode is the heat pump more efficient?
A: Heating mode
B: Cooling mode
C: Defrost mode
D: Emergency heating mode - CORRECT ANSWER A: Heating mode
Which of the following components is exclusive to the heat pump?
A: Condenser
B: Oil separator
C: Reversing valve
D: Accumulator - CORRECT ANSWER C: Reversing valve
Which of the following airflow rates is the most reasonable for a heat pump system
operating in the heating cycle?
A: 200 cfm per ton
B: 300 cfm per ton
C: 400 cfm per ton
,D: 450 cfm per ton - CORRECT ANSWER D: 450 cfm per ton
During the heat pump's cooling cycle, the outdoor coil is utilized as a _________ while
the indoor coil is utilized as a____________.
A: Condenser, evaporator
B: Evaporator, condenser
C: Compressor, accumulator
D: Accumulator, condenser - CORRECT ANSWER A: Condenser, evaporator
Heat is present in winter outdoor air until the outside air ambient temperature reaches a
low temperature of:
A: 0 degrees F
B: 32 degrees F
C: 273 degrees F
D: -459 degrees F - CORRECT ANSWER D: -459 degrees F
Technically this is true, but not practical. A heat pump is doing good to continue to work
below 10 deg F unless specifically designed for lower temperatures.
The heat pump utilizes:
A: Two filter-driers with check valves
B: One bi-flow filter-drier
C: A single mono-flow filter-drier in the liquid line
D: Some use the bi-flow filter-drier and others use two filter-driers with check valves -
CORRECT ANSWER D: Some use the bi-flow- filter-drier and others use two filter-
driers with check valves
The correct way to size a heat pump is to perform both heating and cooling load
calculations and select the heat pump size by:
A: Adding the heating load and cooling loads
B: Subtracting the smaller load from the larger load
,C: Using the heating load to size the system
D: Using the cooling load to size the system - CORRECT ANSWER D: Using the
cooling load to size the system
Auxiliary electric heat is necessary because:
A: It provides heat for the home during defrosts
B: It provides heat for the home in the event of a heat pump failure
C: It provides heat for the home if the heat pump is unable to meet the demand for heat
D: All of the above - CORRECT ANSWER D: All of the above
Reading a voltage across the contacts of the outdoor thermostat means:
A: The thermostat contacts are closed
B: The thermostat contacts are open
C: The thermostat contacts are stuck
D: The thermostat contacts are working correctly - CORRECT ANSWER B: The
thermostat contacts are open
Which of the following is not a type of heat pump?
A: Ground to air
B: Air to air
C: Water to air
D: Direct coupled - CORRECT ANSWER D: Direct coupled
The coefficient of performance is determined by:
A: Dividing the output btuh by the input btuh
B: Dividing the input btuh by the output btuh
C: Multiplying the input by the output
, D: Subtracting the output from the input - CORRECT ANSWER B: Dividing the
input btuh by the output btuh
The coefficient of performance or COP of a heat pump, refrigerator or air conditioning
system is a ratio of useful heating or cooling provided to work required. Higher COPs
equate to higher efficiency.
The "balance point" of a heat pump is:
A: The lowest temperature at which the heat pump can meet the heating requirement
for the structure
B: The lowest temperature at which the heat pump can operate
C: The temperature at which the heat pump has the highest efficiency
D: The point at which the heating and cooling loads meet - CORRECT ANSWER
A: The lowest temperature at which the heat pump can meet the heating requirement
for the structure
Which of the following is an incorrect term for the solenoid valve that switches the heat
pump between the heating and cooling modes?
A: Changeover valve
B: Reversing valve
C: Four-way valve
D: Discharge operator valve - CORRECT ANSWER D: Discharge operator valve
The best location for the outdoor section of an air to air heat pump is:
A: Where it gets the winter sun
B: Where it is sheltered from the sun's radiation
C: Where it never snows
D: Under the shelter of a porch - CORRECT ANSWER A: Where it gets the winter
sun
What may happen if the body of a reversing valve is slightly dented?
A: Nothing, as they are made to be very durable
ANSWERS/ LATEST UPDATE WITH SOME PRACTICE EXAM IN IT (North
American Technician Excellence) 2024 GRADED A+
Charging a heat pump with refrigerant is best accomplished in the _______ mode.
A: Heating mode
B: Cooling mode
C: Defrost mode
D: Emergency heating mode - CORRECT ANSWER B: Cooling mode
Heat pumps can provide both heating in the winter and cooling in the summer. In which
mode is the heat pump more efficient?
A: Heating mode
B: Cooling mode
C: Defrost mode
D: Emergency heating mode - CORRECT ANSWER A: Heating mode
Which of the following components is exclusive to the heat pump?
A: Condenser
B: Oil separator
C: Reversing valve
D: Accumulator - CORRECT ANSWER C: Reversing valve
Which of the following airflow rates is the most reasonable for a heat pump system
operating in the heating cycle?
A: 200 cfm per ton
B: 300 cfm per ton
C: 400 cfm per ton
,D: 450 cfm per ton - CORRECT ANSWER D: 450 cfm per ton
During the heat pump's cooling cycle, the outdoor coil is utilized as a _________ while
the indoor coil is utilized as a____________.
A: Condenser, evaporator
B: Evaporator, condenser
C: Compressor, accumulator
D: Accumulator, condenser - CORRECT ANSWER A: Condenser, evaporator
Heat is present in winter outdoor air until the outside air ambient temperature reaches a
low temperature of:
A: 0 degrees F
B: 32 degrees F
C: 273 degrees F
D: -459 degrees F - CORRECT ANSWER D: -459 degrees F
Technically this is true, but not practical. A heat pump is doing good to continue to work
below 10 deg F unless specifically designed for lower temperatures.
The heat pump utilizes:
A: Two filter-driers with check valves
B: One bi-flow filter-drier
C: A single mono-flow filter-drier in the liquid line
D: Some use the bi-flow filter-drier and others use two filter-driers with check valves -
CORRECT ANSWER D: Some use the bi-flow- filter-drier and others use two filter-
driers with check valves
The correct way to size a heat pump is to perform both heating and cooling load
calculations and select the heat pump size by:
A: Adding the heating load and cooling loads
B: Subtracting the smaller load from the larger load
,C: Using the heating load to size the system
D: Using the cooling load to size the system - CORRECT ANSWER D: Using the
cooling load to size the system
Auxiliary electric heat is necessary because:
A: It provides heat for the home during defrosts
B: It provides heat for the home in the event of a heat pump failure
C: It provides heat for the home if the heat pump is unable to meet the demand for heat
D: All of the above - CORRECT ANSWER D: All of the above
Reading a voltage across the contacts of the outdoor thermostat means:
A: The thermostat contacts are closed
B: The thermostat contacts are open
C: The thermostat contacts are stuck
D: The thermostat contacts are working correctly - CORRECT ANSWER B: The
thermostat contacts are open
Which of the following is not a type of heat pump?
A: Ground to air
B: Air to air
C: Water to air
D: Direct coupled - CORRECT ANSWER D: Direct coupled
The coefficient of performance is determined by:
A: Dividing the output btuh by the input btuh
B: Dividing the input btuh by the output btuh
C: Multiplying the input by the output
, D: Subtracting the output from the input - CORRECT ANSWER B: Dividing the
input btuh by the output btuh
The coefficient of performance or COP of a heat pump, refrigerator or air conditioning
system is a ratio of useful heating or cooling provided to work required. Higher COPs
equate to higher efficiency.
The "balance point" of a heat pump is:
A: The lowest temperature at which the heat pump can meet the heating requirement
for the structure
B: The lowest temperature at which the heat pump can operate
C: The temperature at which the heat pump has the highest efficiency
D: The point at which the heating and cooling loads meet - CORRECT ANSWER
A: The lowest temperature at which the heat pump can meet the heating requirement
for the structure
Which of the following is an incorrect term for the solenoid valve that switches the heat
pump between the heating and cooling modes?
A: Changeover valve
B: Reversing valve
C: Four-way valve
D: Discharge operator valve - CORRECT ANSWER D: Discharge operator valve
The best location for the outdoor section of an air to air heat pump is:
A: Where it gets the winter sun
B: Where it is sheltered from the sun's radiation
C: Where it never snows
D: Under the shelter of a porch - CORRECT ANSWER A: Where it gets the winter
sun
What may happen if the body of a reversing valve is slightly dented?
A: Nothing, as they are made to be very durable
