ASE A6 Electrical Electronics Practice Test

41. A full-fielded 70 amp alternator only produces 45 amps. The MOST likely cause of this is:

  • A. A worn brush.
  • B. An open regulator.
  • C. A worn commutator.
  • D. A burned diode.

41.

Answer A is wrong. If the alternator had a worn brush it would have low or no output.

Answer B is wrong. The alternator would have no output.

Answer C is wrong. The alternator would likely have low or no output.

Answer D is correct. A burned diode would leave only two-thirds output. Test the alternators rectifier bridge for a faulty diode.

42. The cruise control of a vehicle is being diagnosed for intermittent operation. Which of the following components is LEAST likely to affect its operation?

  • A. Vehicle Speed Sensor
  • B. Turn Signal Switch
  • C. Brake Switch
  • D. Throttle Position Sensor

42.

Answer A is wrong. A faulty control module will affect operation of a cruise control system.

Answer B is correct. A fautly turn signal switch is not likely to result in an inoperative cruise control system.

Answer C is wrong. A faulty brake switch will affect operation of a cruise control system. The driver uses the brake pedal to disable cruise control.

Answer D is wrong. A faulty TP sensor will affect the operation of a cruise control system.

Voltage drop test

43. The door locks in the vehicle in the circuit diagram above will unlock only, there is no lock action when the switch is depressed. The door lock relay has been replaced and there is still no door lock operation. Which of the following is MOST likely causing this condition?

  • A. A faulty switch.
  • B. The wrong type of relay.
  • C. A blown 30 amp fuse.
  • D. A faulty circuit breaker.

43.

Answer A is wrong. Neither switch will lock the doors. Notice the diodes in each of the relays.

Answer B is correct. Not all relays are the same. Some relays contain clamping diodes that protect sensitive control circuits.

Answer C is wrong. Clamping diodes are installed in reverse bias across the coil and allow current to flow in only one direction. Answer B is correct.

Answer D is wrong. Answer B is correct. A circuit breaker will affect both door lock relays.

44. The headlights get brighter as a vehicle is accelerated. Technician A says this is caused by a high capacity battery. Technician B says this is caused by high charging system voltage. Who is correct?

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

44.

Answer A is wrong. This is caused by high charging system voltage.

Answer B is correct. This is caused by high charging system voltage. An electro-mechanical voltage regulator may get stuck in the closed position providing maximum voltage.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

45. A technician replaces a blown fuse in a dome light circuit and the element in the fuse melts immediately. Technician A says if a dome light keeps blowing fuses to check for a short to ground. Technician B says resistance in this circuit has increased current flow. Who is correct?

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

45.

Answer A is correct. When a circuit repeatedly blows the fuse check for a short.

Answer B is wrong. Resistance decreases current flow.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.