| ASE A-7 Heating and Air Conditioning Certification Practice Answers |
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Answer A is wrong. A low refrigerant charge would effect A/C performance. Answer B is wrong. A faulty control valve would effect the A/C performance. Answer C is correct. A variable displacement compressor uses a control valve to alter system pressures. A cycling clutch orifice tube system has a pressure cycling switch on the low side of the system, often located on the accumulator. Answer D is wrong. A weak compressor would result in poor A/C performance. |
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Answer A is wrong. . Both technicians are correct. Answer B is wrong. . Both technicians are correct. Answer C is correct. A relay is a device used to protect control devices like PCM's from the high current used to power devices like an A/C clutch or a radiator fan. A faulty A/C relay will leave an A/C compressors clutch inoperative. Answer D is wrong. Both technicians are correct. |
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Answer A is wrong. The evaporator removes humidity from the air. Answer B is wrong. The refrigerant flows from the bottom to the top. Answer C is wrong. The refrigerant enters the evaporator core as a liquid. Answer D is correct. The refrigerant converts from a liquid to a vapor because it boils as it receives heat from the cabin air. Refrigerant has a very low boiling point. |
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Answer A is wrong. The refrigerant enters the condenser as a gas and leaves as a liquid. Answer B is wrong. The pressure will build up blowing seals and damaging upstream components. Answer C is correct. Both technicians are correct. Answer D is wrong. Both technicians are correct. |
15. Answer A is wrong. A short in the motors power feed would result in little or no operation in all speeds. Answer B is correct. The blower resisters lower speeds share the same power source and offer varying resistance while the high speed has no resistance and is on its own circuit. Answer C is wrong. Technician B is correct. Answer D is wrong. Technician B is correct. |
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