Heat Pump Exam with 100% Correct Answers

Charging a heat pump with refrigerant is best accomplished in the _______ mode. - B: Cooling mode Which of the following can prevent the reversing valve from changing positions? A: Low refrigerant charge B: Overcharge of refrigerant C: Air in the system D: Low indoor airflow due to a dirty air filter - A: Low refrigerant charge The supply air temperature on a normally operating heat pump is: A: Lower than that of a gas heating system B: Higher than that of a gas heating system C: About the same as that of a gas heating system D: Heat pumps do not use supply air - A: Lower than that of a gas heating system When a heat pump is operating in the cooling mode, the suction line at the compressor should feel _____ and when operating in the heating mode the same suction line should feel _____. A: Cool, hot B: Hot, cool C: Hot, hot D: Cool, cool - D: Cool, cool High SEER rated heat pumps are those that employ: A: Scroll compressors and over-sized coils B: Reciprocating compressors and over-sized coils C: Scroll compressors and accumulators D: Reciprocating compressors and accumulators - A: Scroll compressors and over-sized coils Which of the following metering devices can improve the operating efficiency of a heat pump? A: Thermostatic expansion valve B: Automatic expansion valve C: Fixed orifice D: Capillary tube - A: Thermostatic expansion valve During the defrost cycle the outdoor fan motor is: A: Shut down B: Operated at a reduced speed C: Stepped up to its highest speed D: Allowed to run at its normal speed - A: Shut down