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. NATE Industry Competency Exam Questions and Answers- Heat Pumps
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. NATE Industry Competency Exam Questions and Answers- Heat Pumps
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. NATE Industry Competency Exam Questions and Answers- Heat PumpsA correct statement regarding the outdoor coil of a heat pump is that damage may result
if the:
a. Indoor blower fails to operate.
b. Defrost water does not drain from the coil.
c. Indoor check valve sticks.
d. Outdoor metering device sticks open. Answer - B
If this unit is installed on 208 volts, the transformer primary should be wired: a. To the black and red leads of the transformer.
b. To the black and orange leads of the transformer.
c. To the red and orange leads of the transformer.
d. To the black and brown leads of the transformer. Answer - A
During the initial startup of a heat pump with a long line set, which of the following is the most accurate method to charge the system?
a. Put the unit into the cooling mode and charge it by the superheat method.
b. Weight in the exact charge.
c. Charge to proper sub-cooling.
d. Charge the unit by the superheat method in the heating mode. Answer - B
A technician has just installed a heat pump. it heats satisfactorily but will not cool. A possible cause of this problem is the:
a. Outdoor check valve is not closing.
b. Indoor check valve is stuck closed.
c. Indoor check valve is stuck open.
d. Outdoor metering device is not functioning. Answer - C
On a heat pump system operating in the heating mode, measurements show a high suction pressure at the compressor. the most likely explanation is a:
a. Leaking indoor check valve.
b. Loose sensing bulb on the indoor expansion valve. c. Leaking reversing valve.
d. Loss of charge in the bulb of the outdoor expansion valve. Answer - C
A dirty air filter on a heat pump system will result in:
a. Low suction pressure in both mode.
b. High head pressure in both mode.
c. Low head pressure in the heat mode and high suction pressure in the cool mode.
d. High head pressure in the heat mode and low suction pressure in the cool mode. Answer - D
If the reversing valve were to stick in the halfway position, which one of the following would the service gauge indicate?
a. Low discharge pressure and low suction pressure.
b. Low suction pressure and normal discharge pressure.
c. Low discharge pressure and high suction pressure.
d. High discharge pressure and low suction pressure. Answer - C
Coefficient of performance (COP) is used primarily in the heating/cooling field to compare heatpump efficiencies to those of:
a. Oil heating units.
b. Coal heating units.
c. Electric heating units.
d. An overcharge of refrigerant. Answer - C
Temperature check at the connections of the reversing valve will indicate:
a. A low refrigerant charge.
b. Reversing valve leakage.
c. Indoor check valve leakage.
d. An overcharge of refrigerant. Answer - B
An electric furnace has four 5-kw elements that are rated at 240V. the available voltage to operate the furnace is 208V. which of the following indicates the effect that this will have on the BTU/H output of the furnace?
a. It will increase BTU/H output of the furnace.
b. There will be no reduction of BTU/H output if the elements are connected in series.
c. There will be no reduction of BTU/H output if the elements are connected in parallel.
d. It will reduce BTU/H output of the furnace. Answer - D
If a heat pump compressor fails and requires clean-up, a section line filter-drier should be temporarily installed:
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