ASE G1 Maintenance & Lt. Repair Practice Test

36. A technician is performing an A/C inspection. The fan is set on high but there is little air flow through the vents. Technician A says this could be caused by a clogged cabin air filter. Technician B says there could be an open in the blower motor’s power circuit. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

36.

Answer A is correct. There’s a restriction caused by leaves and debris.

Answer B is wrong. An open in the power feed would result in no blower motor operation.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.

37. Two technicians are discussing the evaporator's function in an automotive air conditioning system. All of these are true about the evaporator EXCEPT:

  • A. It removes humidity from the air.
  • B. Refrigerant flows from the bottom to the top.
  • C. Refrigerant enters the evaporator as a liquid.
  • D. The refrigerant changes from a vapor to a liquid as it receives heat from the cabin air.

37.

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. This is because it boils as it receives heat from the cabin air. Refrigerant has a very low boiling point.

38. Technician A says a stuck open PCV valve will cause a lean fuel condition. Technician B says the PCV system removes blowby gases from the crankcase. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

38.

Answer A is wrong. A stuck open PCV valve will cause a lean condition, the engine will misfire and the PCM will attempt to adjust the air fuel ratio accordingly.

Answer B is wrong. The PCV system cleans and protects the crankcase from blowby gas bypassing the piston rings and contaminating the engine oil. Vacuum through the open valve draws blowby gas into intake manifold and then into the combustion chamber for re-combustion.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

39. A technician removes and replaces a worn lower radiator hose on a four cylinder engine. The engine overheats after replacing the hose and adding coolant. Which of these is the MOST likely cause of this condition?

  • A. A faulty ECT sensor.
  • B. A stuck open thermostat.
  • C. An air pocket in the system.
  • D. Electrolysis.

39.

Answer A is wrong. A faulty ECT sensor will cause the vehicle to overheat, but usually if the vehicle overheats after the coolant has been drained and filled it is caused by an air pocket in the cooling system.

Answer B is wrong. A stuck open thermostat will result in a below normal operating temperature.

Answer C is correct. An air pocket has likely formed. Water pump cavitation and air pockets cause this condition.

Answer D is wrong. Electrolysis is caused by coolant breakdown and shorts in the electrical system. It prematurely corrodes aluminum parts like water pumps and thermostat housings.

40. The serpentine accessory drive belt of an engine squeaks, but appears to be in good condition. Technician A says this could be caused by a faulty idler bearing. Technician B says to check the belt with a belt gauge. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

40.

Answer A is wrong. Worn idler and tensioner bearings squeak and make noise, but remember newer EPDM belts sometimes don't show cracks and wear like their neoprene predecessors. To check an idler or tensioner bearing remove the belt and inspect for looseness and noise.

Answer B is wrong. Using a gauge or belt tension tool is the best way to check belt wear.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

ASE G1 Maintenance and Lt. Repair Quiz
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