NATE EXAM: AIR CONDITIONING
AND HEAT PUMPS EXAM WITH
100% ACCURATE ANSWERS
2026/2027
1. A 24-V transformer with a 40-VA rating can operate safely with
a current of ____.
a. 6.0 mA
b. 960.0 mA
c. 0.6 A
d. 1.67 A - ANSWER-d (1.67 A)
2. A cooling anticipator in the control circuit is connected in ____
with the ____ switch of the thermostat.
a. parallel, cooling
b. parallel, heating
c. series, cooling
d. series, heating - ANSWER-a (parallel, cooling)
3. A cooling load calculation estimates the sensible heat gain of a
structure. The maximum sensible capacity of a cooling-only
system should be within ____% of this calculated value.
a. ±10%
b. +10%
c. +15%
, d. +30% - ANSWER-c (+15%)
4. A good fuse will yield a reading of ____ on an ohmmeter.
a. 0Ω
b. less than 1 Ω
c. infinity
d. a value that rises quickly to 0 before falling slowly
toward infinity - ANSWER-a (0 Ω)
5. A resistance reading of 0 Ω across a coil indicates that the coil
is ____.
a. good
b. grounded
c. open
d. shorted - ANSWER-d (shorted)
6. A resistance reading of infinity between the "R" terminal and
the "S" terminal of a compressor motor indicates a(n) ____.
a. grounded motor winding
b. open motor winding
c. shorted motor winding
d. tripped internal overload - ANSWER-b (open motor
winding)
7. A small voltage reading across a closed set of contacts in an
energized circuit indicates that the ____.
a. contacts are in good condition
b. contacts are pitted
, c. motor capacitor is defective
d. wrong voltage is supplied to the unit - ANSWER-b
(contacts are pitted)
8. A system should be operated for at least ____ before heat
measurements are taken.
a. 20 minutes
b. 30 minutes
c. 45 minutes
d. 1 hour - ANSWER-a (20 minutes)
9. According to Ohm's Law, what will happen if voltage to a
heater element is increased by 10%?
a. The Btuh output will increase by 5%
b. The current draw will decrease by 10%
c. The current draw will increase by 10%
d. The heater will overheat - ANSWER-c (the current draw
will increase by 10%)
10. All safety switches must be ____.
a. connected in parallel with the control switch
b. connected in series with the control switch
c. normally closed limit switches
d. open at the same time in order to protect the load -
ANSWER-b (connected in series with the control switch)
11. An acceptable capacitance reading for a run capacitor is
____ the microfarad rating printed on the capacitor.
AND HEAT PUMPS EXAM WITH
100% ACCURATE ANSWERS
2026/2027
1. A 24-V transformer with a 40-VA rating can operate safely with
a current of ____.
a. 6.0 mA
b. 960.0 mA
c. 0.6 A
d. 1.67 A - ANSWER-d (1.67 A)
2. A cooling anticipator in the control circuit is connected in ____
with the ____ switch of the thermostat.
a. parallel, cooling
b. parallel, heating
c. series, cooling
d. series, heating - ANSWER-a (parallel, cooling)
3. A cooling load calculation estimates the sensible heat gain of a
structure. The maximum sensible capacity of a cooling-only
system should be within ____% of this calculated value.
a. ±10%
b. +10%
c. +15%
, d. +30% - ANSWER-c (+15%)
4. A good fuse will yield a reading of ____ on an ohmmeter.
a. 0Ω
b. less than 1 Ω
c. infinity
d. a value that rises quickly to 0 before falling slowly
toward infinity - ANSWER-a (0 Ω)
5. A resistance reading of 0 Ω across a coil indicates that the coil
is ____.
a. good
b. grounded
c. open
d. shorted - ANSWER-d (shorted)
6. A resistance reading of infinity between the "R" terminal and
the "S" terminal of a compressor motor indicates a(n) ____.
a. grounded motor winding
b. open motor winding
c. shorted motor winding
d. tripped internal overload - ANSWER-b (open motor
winding)
7. A small voltage reading across a closed set of contacts in an
energized circuit indicates that the ____.
a. contacts are in good condition
b. contacts are pitted
, c. motor capacitor is defective
d. wrong voltage is supplied to the unit - ANSWER-b
(contacts are pitted)
8. A system should be operated for at least ____ before heat
measurements are taken.
a. 20 minutes
b. 30 minutes
c. 45 minutes
d. 1 hour - ANSWER-a (20 minutes)
9. According to Ohm's Law, what will happen if voltage to a
heater element is increased by 10%?
a. The Btuh output will increase by 5%
b. The current draw will decrease by 10%
c. The current draw will increase by 10%
d. The heater will overheat - ANSWER-c (the current draw
will increase by 10%)
10. All safety switches must be ____.
a. connected in parallel with the control switch
b. connected in series with the control switch
c. normally closed limit switches
d. open at the same time in order to protect the load -
ANSWER-b (connected in series with the control switch)
11. An acceptable capacitance reading for a run capacitor is
____ the microfarad rating printed on the capacitor.
