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Which type of motor is used in a conventional starter?

  • A.A series wound direct current motor
  • B.A shunt wound motor, whose field is connected in parallel with the armature and therefore gives a constant speed
  • C.An induction motor
  • D.A compound wound motor, whose series and shunt fields combine to give a high torque with a controlled maximum speed

Answer: A

A series motor develops very high torque at stall, which is exactly what an engine needs to be turned from rest. Its speed rises without limit off load, which does not matter because the pinion disengages. Compound machines are used in some heavy duty starters. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming what changes and what stays the same is the reliable route through questions of this shape.

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