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Which safety precaution applies during a starter bench test?

  • A.Wear insulating gloves, which are required because of the voltage at which the test is conducted upon the bench
  • B.None
  • C.Run the motor for at least a minute, which allows the readings to stabilise before they are recorded for comparison
  • D.Clamp the unit securely because of the reaction torque

Answer: D

The reaction torque of a starter is violent and an unclamped unit will fly off the bench. Twelve volts presents no shock hazard. Prolonged running would overheat it, so the last option contradicts the duty cycle rule. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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