Certification Test for A/C and Heating Latest Questions With Passed Solutions

On which of the following laws of nature is the air-conditioning system based? - Answer-Heat flow, Heat absorption, Pressure and Boiling Points 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. - Answer-D. None of these answers are correct 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 - Answer-C. The accumulator is located between the condenser and the receiver/dryer. 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 - Answer-C. R-12 is destructive to Earth's ozone layer Which of the following may be electrically connected in series with the compressor electromagnetic clutch? - Answer-Ambient temperature switch, Thermostatic switch, Pressure cycling switch Which of the following oils can be used in an R-134a system? - Answer-PAG oil A heating system includes all of the following parts except:A. heater core B. ventilation system C. receiver/dryer D. distribution plenum - Answer-C. receiver/dryer 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. - Answer-A. The evaporator changes heated refrigerant to a liquid. Heater control valves are operated by a ___________________. - Answer-cable, thermostat, and vacuum motor All materials or substances, as cold as ________________, have heat in them. - Answer--459 degrees Fahrenheit (-273 degrees Celsius) 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 - Answer-C. Both A and B