ASE A6 Electrical Electronics Practice Test

16. Which type of solder is used when soldering an automotive electrical connection?

  • A. Rosin Core
  • B. Zinc
  • C. Silver
  • D. Acid Core

16.

Answer A is correct. Rosin core solder is non-corrosive. The center contains flux that cleans the surface of the wire to be soldered. Solder is often a combination of mixed alloys and melts at about 370° F.

Answer B is wrong. Zinc can have a corrosive effect on certain metals.

Answer C is wrong. Silver solder is best for brazing.

Answer D is wrong. Acid core solder is used on piping. Automotive applications use 60/40 Rosin core, containing 60% tin and 40% lead.

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Voltage drop test

17. The schematic diagram above:

  • A. Is a schematic.
  • B. Contains 12 diodes and 4 resistors.
  • C. Both A and B
  • D. Neither A or B
Schematic diagram of an alternator circuit.

17.

Answer A is wrong. It is a schematic of an alternator. Vehicle manufacturers create diagrams of the entire vehicle that can be complex and difficult to sort through, so they're broken down into system-specific diagrams called block diagrams.

Answer B is wrong. Schematics are used in electronics; they contain standardized symbols to represent components in a circuit. It contains 12 diodes and 4 resistors.

Answer C is correct. Both A and B are correct.

Answer D is wrong. Both A and B are correct. The schematic contains diodes, resistors, a variable resistor, and symbols representing solid-state circuitry.

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18. All the gauges in an instrument panel display maximum output. Which of the following is MOST likely causing this condition?

  • A. High charging system output.
  • B. A faulty instrument panel voltage limiter.
  • C. A loose instrument panel plug.
  • D. A faulty ignition switch.

18.

Answer A is wrong. High charging system voltage is typically caused by a faulty alternator voltage regulator; they adjust output voltage according to demands.

Answer B is correct. The voltage limiter reduces and controls the voltage to the instrument gauges in the instrument panel. They regulate the voltage at or near 5 volts; a faulty voltage limiter produces high instrument cluster gauge readings.

Answer C is wrong. Today's vehicles have hundreds of connectors, and any loose connection results in intermittent or no operation.

Answer D is wrong. The ignition switch will not likely result in this condition. They usually cause issues with the engine starting and the vehicle's alarm system. When the voltage limiter/regulator is faulty, the gauges read higher than the actual condition.

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Multimeter reading

19. The digital multimeter display illustrated above indicates:

  • A. .016 Ohms
  • B. .016 Volts
  • C. 16 Ohms
  • D. 16 Volts

19.

Answer A is wrong. With a conventional manual multimeter, the user would either know beforehand or rotate the dial to find the appropriate range.

Answer B is wrong. An auto-ranging multimeter automatically finds the range and indicates it on the screen for the technician. This is great when working with sensors, circuit boards, and resistors.

Answer C is correct. The multimeter indicates 16 Ohms. Since the meter's dial is set to measure kiloohms, it is .016 x (K), or times (1000) equals 16 ohms.

Answer D is wrong. Most circuits, sensors, and actuators can be tested using a digital multimeter. Autoranging is just another convenient add-on to a digital meter.

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Oscilloscope TP Sensor waveform

20. Two technicians are discussing the waveform of the throttle position sensor displayed above. Technician A says the sensor in the image is faulty. Technician B says the engine will hesitate during acceleration. Who is correct?

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

20.

Answer A is wrong. The waveform should be smooth with no drops in voltage.

Answer B is wrong. Oscilloscopes display a graph of an electrical signal in a circuit over time. They display real-time signals, allowing us to look at the behavior of a circuit.

Answer C is correct. Both technicians are correct. The TPS waveform in the image has skips and dips in its pattern as the throttle plate is slowly opened and closed.

Answer D is wrong. Adapters are available to display different waveforms like temperature, pressure, and current.

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