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 ____.
- 6.0 mA
- 960.0 mA
- 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.
- parallel, cooling
- parallel, heating
- 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.
- ±10%
- +10%
- +15%
d. +30% -CORRECT ANSWER: c (+15%) 1 / 3
A good fuse will yield a reading of ____ on an ohmmeter.
- 0 Ω
- less than 1 Ω
- infinity
- 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 ____.
- good
- grounded
- 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) ____.
- grounded motor winding
- open motor winding
- 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 ____.
- contacts are in good condition 2 / 3
- contacts are pitted
- motor capacitor is defective
- 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.
- 20 minutes
- 30 minutes
- 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%?
- The Btuh output will increase by 5%
- The current draw will decrease by 10%
- The current draw will increase by 10%
- The heater will overheat -CORRECT ANSWER: c (the current draw will increase by
10%)
All safety switches must be ____.
- connected in parallel with the control switch
- connected in series with the control switch
- 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)
- / 3