NATE Exam Practice Test

We present you with a free, core NATE Practice test for your exam preparation.

Our test consists of 17 questions that will test not only your general but also HVACR specific knowledge in the areas of basic science utility, safety, tool, and construction as well as taking temperature and humidity measurements.

Each question is carefully selected and designed by professionals in the field and it contains an explanation that will support your process of learning and revision.

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Question 1

Is it possible for the power factor to be expressed as the ratio of the actual power to the apparent power?

A	Yes
B	No

Question 1 Explanation:

The power factor can be expressed as the ratio of the actual power to the apparent power.

Question 2

Please mark the term that describes the difference between the wet-bulb and dry-bulb temperatures:

A	Latent heat temperature
B	Relative humidity temperature
C	Wet-bulb depression
D	Dew point temperature

Question 2 Explanation:

Wet-bulb depression describes the difference between the dry-bulb and wet-bulb temperatures.

Question 3

Please mark the resistance of a simple resistive circuit if the voltage in it is 240V AC and the current is 10 amps:

A	60 ohms
B	2400 ohms
C	24 ohms
D	120 ohms

Question 3 Explanation:

The resistance of a simple resistive circuit is 24 ohms if the voltage in it is 240V AC and the current is 10 amps.

Question 4

Does TXV controls the quantity of liquid refrigerant that enters the evaporator?

A	Yes
B	No

Question 4 Explanation:

TXV controls the quantity of liquid refrigerant that enters the evaporator.

Question 5

What should the level of the run speed of centrifugal switch motor be when used to take a start winding out of the circuit?

A	75%
B	100%
C	90%
D	50%

Question 5 Explanation:

The level of the run speed of centrifugal switch motor should be 75 % when used to take a start winding out of the circuit.

Question 6

Whose temperature is located at the bottom of the psychometric chart?

A	Dry-bulb temperature
B	Wet-bulb temperature
C	Dew point temperature
D	Latent heat temperature

Question 6 Explanation:

Dry-bulb temperature is located at the bottom of the psychrometric chart.

Question 7

Does the oil change into tiny droplets for proper combustion in the process of vaporization?

A	True
B	False

Question 7 Explanation:

The oil doesn't change into tiny droplets for proper combustion in the process of vaporization.

Question 8

Please mark the Heavy grade fuel oil according to ASTM specifications for fuel oil properties:

A	Grade 5
B	Grade 1
C	Grade 6
D	Grade 2

Question 8 Explanation:

Grade 5 is the Heavy grade fuel oil according to ASTM specifications for fuel oil properties.

Question 9

In what way in a circuit shall voltmeter be always connected?

A	In series in a circuit
B	In parallel in a circuit
C	It depends on the circuit

Question 10

Is the air temperature always the same as the temperature of water vapor?

A	Yes
B	No

Question 10 Explanation:

The air temperature is always the same as the temperature of water vapor.

Question 11

Please mark the one that converts dc voltage to ac voltage:

A	Transistor
B	Rectifier
C	Inverter
D	Cycloconverter

Question 11 Explanation:

The inverter converts dc voltage to ac voltage.

Question 12

What specifications contain the number of air changes required in a commercial structure?

A	Uniform Mechanical Code
B	ARI
C	OSHA
D	ASHRAE

Question 12 Explanation:

ASHRAE specifications contain the number of air changes required in a commercial structure.

Question 13

Does the reliability of the system perform less when there is a lower charge of the system refrigerant?

A	Yes
B	No

Question 13 Explanation:

The reliability of the system doesn't perform less when there is a lower charge of the system refrigerant.

Question 14

Please mark the correct statement regarding the resistance of a conductor:

A	The resistance of a conductor is inversely proportional to the length of the conductor and directly proportional to the area of the cross-section of the conductor.
B	The resistance of a conductor is inversely proportional to the length of the conductor and inversely proportional to the area of the cross-section of the conductor.
C	The resistance of a conductor is directly proportional to the length of the conductor and directly proportional to the area of the cross-section of the conductor.
D	The resistance of a conductor is directly proportional to the length of the conductor and inversely proportional to the area of the cross-section of the conductor.

Question 14 Explanation:

The resistance of a conductor is directly proportional to the length of the conductor and inversely proportional to the area of the cross-section of the conductor.

Question 15

Please mark the code that refers to the installation of electrical equipment:

A	OSHA
B	CIGRE
C	NEMA
D	NEC

Question 15 Explanation:

The NEC code deals with the installation of electrical equipment.

Question 16

What connects the evaporator to the compressor?

A	The liquid line connects the evaporator to the compressor.
B	The expansion line connects the evaporator to the compressor.
C	The discharge line connects the evaporator to the compressor.
D	The suction line connects the evaporator to the compressor.

Question 16 Explanation:

The suction line connects the evaporator to the compressor.

Question 17

Please mark what causes erratical action of refrigerant gauges:

A	Oil in the gauges or hoses
B	Low oil levels in the system
C	Low outdoor ambient
D	High outdoor ambient

Question 17 Explanation:

Oil in the gauges or hoses causes refrigerant gauges to act erratically.

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NATE Exam Practice Test

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