HVAC Certification Practice Test
Questions and Answers
At what voltage is gas valve operates? - ANSWERS -24V
Furnaces are placed into categories based upon - ANSWERS -Venting characteristics
What type of compressor uses two special helical rotors that introduce suction vapors then
compress them? - ANSWERS -Screw compressors
1 kWh of electric power is equivalent to how many Btu per hour: - ANSWERS -3412
A high pressure steam boiler operates at a pressure greater than - ANSWERS -15 psig
Propane and Butane are _______ than air: - ANSWERS -Heavier
What will be the resistance in the circuit if the supply voltage is 30V and current flowing through
the circuit is 5A - ANSWERS -6 ohms
Temperature at which oil starts to produce a waxy substance that may interfere with the
refrigeration system - ANSWERS -Floc point
What manifold gauge set is used to charge, evacuate, add oil and recover refrigerant from a
refrigeration and air conditioning system? - ANSWERS -Yellow hose
Where is the oil separator located? - ANSWERS -Discharge line
Questions and Answers
At what voltage is gas valve operates? - ANSWERS -24V
Furnaces are placed into categories based upon - ANSWERS -Venting characteristics
What type of compressor uses two special helical rotors that introduce suction vapors then
compress them? - ANSWERS -Screw compressors
1 kWh of electric power is equivalent to how many Btu per hour: - ANSWERS -3412
A high pressure steam boiler operates at a pressure greater than - ANSWERS -15 psig
Propane and Butane are _______ than air: - ANSWERS -Heavier
What will be the resistance in the circuit if the supply voltage is 30V and current flowing through
the circuit is 5A - ANSWERS -6 ohms
Temperature at which oil starts to produce a waxy substance that may interfere with the
refrigeration system - ANSWERS -Floc point
What manifold gauge set is used to charge, evacuate, add oil and recover refrigerant from a
refrigeration and air conditioning system? - ANSWERS -Yellow hose
Where is the oil separator located? - ANSWERS -Discharge line
