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Troubleshooting Quizz
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# 1

Multiple Choice

A circuit is reported “dead.” Technician measures 230 V between live and neutral at supply but no voltage across the load. Most probable cause is?

  • A short circuit occurring inside the load device.

  • An open conductor fault somewhere in the supply.

  • A broken neutral conductor between switch and load.

  • A tripped protective device upstream in supply.

# 2

Multiple Choice

While measuring current with a multimeter, the display reads zero although the device is operating. The most likely error is:

  • The meter was accidentally connected in parallel.

  • The meter’s internal fuse has become permanently open.

  • The meter’s current range was set too high.

  • The circuit contains an unexpected open circuit.

# 3

Multiple Choice

A fuse repeatedly blows when a motor starts, but motor insulation tests normal. The next thing to check should be:

  • A hidden ground fault in the control wiring.

  • Excessive inrush or starting current at motor.

  • An open neutral or supply conductor to motor.

  • Incorrect indication from the test lamp used.

# 4

Multiple Choice

Technician reads 230 V on both sides of a switch, yet the lamp remains off. Best explanation is:

  • The lamp filament has shorted internally and failed.

  • The lamp circuit is missing a neutral return path.

  • The switch is internally shorted and not switching.

  • The supply voltage is fluctuating and unstable.

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