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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 460 V.
 230 V.
 200 V.
 115 V.

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 51.5Hz
 48.5Hz
 2.5Hz
 1.5Hz

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Electrical Machines
Satisfactory commutation of DC machine requires

 brushes should be of proper grade and size.
 smooth, concentric commutator properly undercut.
 brushes should smoothly run in the holders.
All of these

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Electrical Machines
In field flux method speed control of DC Motor is

 constant torque drive below the base speed.
 constant power drive above base speed.
 constant hp drive below the base speed.
 constant torque drive above the base speed.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 open type winding
 wave winding
 lap winding
 closed winding

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Electrical Machines
Which of the following represents the pitch factor?

 sin (α/2)
 Cos (α/2)
 Cos α
 Cos α²

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MORE MCQ ON Electrical Machines

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