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 - ANS ✅✅-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 - ANS ✅✅-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% - ANS ✅✅-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
- ANS ✅✅-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 - ANS ✅✅-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 - ANS ✅✅-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 - ANS ✅✅-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 - ANS ✅✅-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 - ANS ✅✅-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 - ANS ✅✅-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.
a. equal to or up to 10% more than
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 - ANS ✅✅-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 - ANS ✅✅-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% - ANS ✅✅-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
- ANS ✅✅-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 - ANS ✅✅-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 - ANS ✅✅-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 - ANS ✅✅-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 - ANS ✅✅-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 - ANS ✅✅-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 - ANS ✅✅-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.
a. equal to or up to 10% more than
