Nate core Exam Questions with 100 Verified

Nate core Exam Questions with 100% Verified Correct Answers Graded A+ 1kwh of electric power is equivalent to ___ btu per hour.

A. 3142

B. 6412

C. 9412

• 6812 - Correct Answer A

Gas valves operate at ____ voltage.

• 120v
• 230v
• 24v
• 12v - Correct Answer C

What will be the resistance in the circuit if the supply voltage is 30v and current flowing through the circuit is 5A.

• 3 ohms
• 1/3 ohms
• 1/6 ohms
• 6 ohms - Correct Answer D

Furnaces are placed into categories based upon.

• Venting characteristics
• Btuh capacity range
• Total airflow in CFM 1 / 3

• Gas valve type - Correct Answer A

An oil separator is located in the____

• Expansion line
• Liquid line
• Suction line
• Discharge line - Correct Answer D

Propane and butane are ____ than air.

• Same weight
• Heavier
• Lighter - Correct Answer B

Current in a closed circuit is limited by which of the following?

• Heat
• Voltage
• Temperature
• Resistance - Correct Answer D

_____ use two special helical rotors that introduce suction vapors then compress them.

• All options are correct
• Scroll compressors
• Reciprocating compressors
• Screw compressors - Correct Answer D 2 / 3

A high pressure steam boiler operates at a pressure greater than ____

• 5 psig
• 15 psig
• 25 psig

D 20 psig - Correct Answer B ____ is the heat that is absorbed or extracted when a substance changes its state.

• Enthalpy
• Entropy
• Latent heat
• Specific heat - Correct Answer C

Sight glass is present at _____ in the refrigeration cycle.

• Liquid line
• Evaporation line
• Suction line
• Expansion valve - Correct Answer A

When there is an increase in the heat load on the evaporator, the refrigerant will tend to evaporate at a _____ rate.

• Slower
• Faster - Correct Answer B

The higher the ambient temperatures, ____ will be the evacuation time of the refrigerants from the system.

• / 3