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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 50 Ω
 100 Ω
 10 Ω
 0.1 Ω

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 leading power factor.
 lagging power factor.
 unity power factor.
None of these

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Electrical Machines
A crusher is equipped with

 DC shunt motor.
 Synchronous motor.
 Slip ring induction motor.
 Reluctance motor.

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Electrical Machines
Which of the following motors is/are widely used?

 either of these
None of these
 slip ring induction motor
 squirrel cage induction motor

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie in the inter polar gaps.
 lie under south pole.
 lie under north pole.
 there is no hard and fast rule for this.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 1
 any of the above
 0
 0.5

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