Certification Test for A/C and Heating Exam Solved 100% Correct

Heat flow, Heat absorption, Pressure and Boiling Points - ANSWER-On which of the following laws of nature is the air-conditioning system based? D. None of these answers are correct - ANSWER-Which of the following statements is not correct? A. Refrigerant leaves the compressor as a high-pressure, high-temperature liquid. B. Refrigerant leaves the condenser as a low-pressure, high-temperature liquid. C. Refrigerant returns to the compressor as a low-pressure, high-temperature vapor. D. None of these answers are correct. C. The accumulator is located between the condenser and the receiver/dryer. - ANSWER-Which of the following statements is not correct? A. The condenser is normally mounted in front of the radiator. B. The receiver/dryer is a storage tank for liquid refrigerant from the condenser. C. The accumulator is located between the condenser and the receiver/dryer. D. All answers are correct C. R-12 is destructive to Earth's ozone layer - ANSWER-Which of the following statements concerning R-12 is correct? A. R-12 is a hydroflurocarbon. B.R-12 boils at 0 degrees Fahrenheit (-18 Celsius) C. R-12 is destructive to Earth's ozone layer D. All answers are correct Ambient temperature switch, Thermostatic switch, Pressure cycling switch - ANSWER-Which of the following may be electrically connected in series with the compressor electromagnetic clutch? PAG oil - ANSWER-Which of the following oils can be used in an R-134a system? C. receiver/dryer - ANSWER-A heating system includes all of the following parts except: A. heater core B. ventilation system C. receiver/dryer D. distribution plenum A. The evaporator changes heated refrigerant to a liquid. - ANSWER-Which of the following statements is NOT correct? A. The evaporator changes heated refrigerant to a liquid. B. Automatic temperature controls maintain a set passenger compartment temperature. C. Air- conditioning/heater systems can be computer controlled. D.Heaters and air-conditioners use the same plenum chambers. cable, thermostat, and vacuum motor - ANSWER-Heater control valves are operated by a ___________________. -459 degrees Fahrenheit (-273 degrees Celsius) - ANSWER-All materials or substances, as cold as ________________, have heat in them. C. Both A and B - ANSWER-Technician A says the thermostatic expansion valve and the fixed orifice tube perform the same function. Technician B says heat from the evaporator core surface is lost to the boiling and vaporizing refrigerant. Who is correct? A. A only B. B only C. Both A and B D. Neither A nor B C. Both A and B - ANSWER-Technician A says suction lines connect the accumulator to the compressor. Technician B says discharge lines connect the compressor to the condenser. Who is correct? A. A only B. B only C. Both A and B D. Neither A nor B D. Neither A nor B - ANSWER-Technician A says the normal operating pressures of R-134a are slightly lower than the pressures of R-12. Technician B says R-134a boils at 134 degrees Fahrenheit. Who is correct? A. A only B. B only C. Both A and B D. Neither A nor B C. Both A and B - ANSWER-A poor heat condition is being discussed. Technician A says the coolant level in the engine's cooling system may be low. Technician B says the engine's thermostat may be faulty. Who is correct? A. A only B. B only C. Both A and B D. Neither A nor B B. High-pressure vapor leaves the evaporator at the top. - ANSWER-Which of the following statements concerning evaporators is NOT true? A. Low- pressure liquid enters the evaporator at the bottom. B. High-pressure vapor leaves the evaporator at the top. C. The evaporator is located underneath the dash. D. Air passing over the evaporator loses its heat to the cooler surface of the core.