Prepare for the HVAC certification exam with these test answers. This guide covers refrigeration cycles, heating systems, air conditioning, and EPA 608 certification.
Q: Propane and Butane are _______ than air:
Answer: Heavier
Q: What will be the resistance in the circuit if the supply voltage is 30V and current flowing through the circuit is 5A
Answer: 6 ohms
Q: Temperature at which oil starts to produce a waxy substance that may interfere with the refrigeration system
Answer: Floc point
Q: What manifold gauge set is used to charge, evacuate, add oil and recover refrigerant from a refrigeration and air conditioning system?
Answer: Yellow hose
Q: Where is the oil separator located?
Answer: Discharge line
Q: Higher the ambient temperatures, ____ will be the evacuation time of the refrigerants from the system
Answer: Lesser
Q: 1 Watt is equal to
Answer: 3.41 Btu’s
Q: Heat that is absorbed or extracted when a substance changes its state is
Answer: Latent heat
Q: Where is the sight glass present in the refrigeration cycle?
Answer: Liquid line
Q: Which shall not be used near flammable materials?
Answer: Halide leak detector
Q: Current in a closed circuit is limited by:
Answer: Resistance
Q: When there is an increase in the heat load on the evaporator, the refrigerant will tend to evaporate at a _____ rate
Answer: Faster
Q: At what voltage is gas valve operates?
Answer: 24V
Q: Furnaces are placed into categories based upon
Answer: Venting characteristics
Q: What type of compressor uses two special helical rotors that introduce suction vapors then compress them?
Answer: Screw compressors
Q: 1 kWh of electric power is equivalent to how many Btu per hour:
Answer: 3412
Q: A high pressure steam boiler operates at a pressure greater than
Answer: 15 psig