DGVCL Exam Paper (11-12-2011)
In which of the following motors, the stator and rotor magnetic fields rotate at the same speed?

Synchronous motor
Reluctance motor
Universal motor
Induction motor

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DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

Eliminate hunting and provide adequate starting torque
Reduce bearing friction
Reduce winding losses
Eliminate losses on account of fair friction

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DGVCL Exam Paper (11-12-2011)
Hysteresis in an instrument means

The change in the same reading when the input is first increased and then decreased
The repeatability of the instrument
The reliability of the instrument
The inaccuracy due to change in temperature

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