DGVCL Exam Paper (11-12-2011)
The form factor in AC means the ration of

Peak value to r.m.s value
R.M.S. value to peak value
Peak value to average value
R.M.S. value to average value

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DGVCL Exam Paper (11-12-2011)
The advantage of slipring induction motor over the squirrel cage induction motor is

It has a higher efficiency
It's power factor is higher
It can be started with the help of rotor resistances
It is suitable for higher speeds

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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

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

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