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Which measurement forms part of a starter bench test?

  • A.Insulation resistance only
  • B.The torque developed at stall, which requires a dynamometer and is therefore performed by the manufacturer alone
  • C.No load current and speed at rated voltage
  • D.The resistance of the armature measured between opposite segments of the commutator during the assembly

Answer: C

No load current and speed at a defined voltage are compared with the specification and reveal most faults. Stall torque testing genuinely is performed with proper equipment, which makes the last option a real test rather than an impossible one. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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