DGVCL Exam Paper (11-12-2011)
A Mho relay is a

Directional restrained over current relay
Voltage restrained directional relay
Voltage controlled over current relay
Directional restrained over voltage relay

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DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

Capacitor start capacitor run motor
Universal motor
Capacitor start motor
Split phase 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 losses on account of fair friction
Eliminate hunting and provide adequate starting torque
Reduce winding losses
Reduce bearing friction

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

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