Nate Core Exam 2023 Questions and
Answers
1kwh of electric power is equivalent to ___ btu per hour.
A. 3142
B. 6412
C. 9412
D. 6812 - ANSWER-A
Gas valves operate at ____ voltage.
A. 120v
B. 230v
C. 24v
D. 12v - ANSWER-C
What will be the resistance in the circuit if the supply voltage is 30v and current flowing
through the circuit is 5A.
A. 3 ohms
B. 1/3 ohms
C. 1/6 ohms
D. 6 ohms - ANSWER-D
Furnaces are placed into categories based upon.
A. Venting characteristics
B. Btuh capacity range
C. Total airflow in CFM
D. Gas valve type - ANSWER-A
An oil separator is located in the____
A. Expansion line
B. Liquid line
C. Suction line
D. Discharge line - ANSWER-D
Propane and butane are ____ than air.
A. Same weight
B. Heavier
, C. Lighter - ANSWER-B
Current in a closed circuit is limited by which of the following?
A. Heat
B. Voltage
C. Temperature
D. Resistance - ANSWER-D
_____ use two special helical rotors that introduce suction vapors then compress them.
A. All options are correct
B. Scroll compressors
C. Reciprocating compressors
D. Screw compressors - ANSWER-D
A high pressure steam boiler operates at a pressure greater than ____
A. 5 psig
B. 15 psig
C. 25 psig
D 20 psig - ANSWER-B
____ is the heat that is absorbed or extracted when a substance changes its state.
A. Enthalpy
B. Entropy
C. Latent heat
D. Specific heat - ANSWER-C
Sight glass is present at _____ in the refrigeration cycle.
A. Liquid line
B. Evaporation line
C. Suction line
D. Expansion valve - ANSWER-A
When there is an increase in the heat load on the evaporator, the refrigerant will tend to
evaporate at a _____ rate.
A. Slower
B. Faster - ANSWER-B
The higher the ambient temperatures, ____ will be the evacuation time of the
refrigerants from the system.
Answers
1kwh of electric power is equivalent to ___ btu per hour.
A. 3142
B. 6412
C. 9412
D. 6812 - ANSWER-A
Gas valves operate at ____ voltage.
A. 120v
B. 230v
C. 24v
D. 12v - ANSWER-C
What will be the resistance in the circuit if the supply voltage is 30v and current flowing
through the circuit is 5A.
A. 3 ohms
B. 1/3 ohms
C. 1/6 ohms
D. 6 ohms - ANSWER-D
Furnaces are placed into categories based upon.
A. Venting characteristics
B. Btuh capacity range
C. Total airflow in CFM
D. Gas valve type - ANSWER-A
An oil separator is located in the____
A. Expansion line
B. Liquid line
C. Suction line
D. Discharge line - ANSWER-D
Propane and butane are ____ than air.
A. Same weight
B. Heavier
, C. Lighter - ANSWER-B
Current in a closed circuit is limited by which of the following?
A. Heat
B. Voltage
C. Temperature
D. Resistance - ANSWER-D
_____ use two special helical rotors that introduce suction vapors then compress them.
A. All options are correct
B. Scroll compressors
C. Reciprocating compressors
D. Screw compressors - ANSWER-D
A high pressure steam boiler operates at a pressure greater than ____
A. 5 psig
B. 15 psig
C. 25 psig
D 20 psig - ANSWER-B
____ is the heat that is absorbed or extracted when a substance changes its state.
A. Enthalpy
B. Entropy
C. Latent heat
D. Specific heat - ANSWER-C
Sight glass is present at _____ in the refrigeration cycle.
A. Liquid line
B. Evaporation line
C. Suction line
D. Expansion valve - ANSWER-A
When there is an increase in the heat load on the evaporator, the refrigerant will tend to
evaporate at a _____ rate.
A. Slower
B. Faster - ANSWER-B
The higher the ambient temperatures, ____ will be the evacuation time of the
refrigerants from the system.
