HVAC Certification Practice Tests Questions and Answers Already Passed

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