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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

None of these
 GNA
 either GNA or MNA
 MNA

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Electrical Machines
A crusher is equipped with

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

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 co- sinusoidal
 rectangular
 sinusoidal
 flat-topped

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 Kef2Kf2Bm.
  Kef2Kf2Bm2.
 KefKf2Bm2.
 Kef2KfBm2.

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC compound motor.
 DC Shunt motor.
 DC series motor.
 Synchronous motor.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant V, Tst increases
 either of these
None of these
 constant supply voltage V, starting torque Tst decreases

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