NATE Exam Air Conditioning and Heat Pumps
Latest Update 2025-2026 100 Questions and
100% Verified Correct Answers Guaranteed A+
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 -CORRECT ANSWER: d (1.67 A)
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 -CORRECT ANSWER: a (parallel, cooling)
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% -CORRECT ANSWER: c (+15%)
,A good fuse will yield a reading of ____ on an ohmmeter.
a. 0 Ω
b. less than 1 Ω
c. infinity
d. a value that rises quickly to 0 before falling slowly toward infinity -CORRECT
ANSWER: a (0 Ω)
A resistance reading of 0 Ω across a coil indicates that the coil is ____.
a. good
b. grounded
c. open
d. shorted -CORRECT ANSWER: d (shorted)
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 -CORRECT ANSWER: b (open motor winding)
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 -CORRECT ANSWER: b (contacts are pitted)
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 -CORRECT ANSWER: a (20 minutes)
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 -CORRECT ANSWER: c (the current draw will increase by
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 -CORRECT ANSWER: b
(connected in series with the control switch)
Latest Update 2025-2026 100 Questions and
100% Verified Correct Answers Guaranteed A+
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 -CORRECT ANSWER: d (1.67 A)
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 -CORRECT ANSWER: a (parallel, cooling)
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% -CORRECT ANSWER: c (+15%)
,A good fuse will yield a reading of ____ on an ohmmeter.
a. 0 Ω
b. less than 1 Ω
c. infinity
d. a value that rises quickly to 0 before falling slowly toward infinity -CORRECT
ANSWER: a (0 Ω)
A resistance reading of 0 Ω across a coil indicates that the coil is ____.
a. good
b. grounded
c. open
d. shorted -CORRECT ANSWER: d (shorted)
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 -CORRECT ANSWER: b (open motor winding)
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 -CORRECT ANSWER: b (contacts are pitted)
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 -CORRECT ANSWER: a (20 minutes)
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 -CORRECT ANSWER: c (the current draw will increase by
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 -CORRECT ANSWER: b
(connected in series with the control switch)
