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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 Infinitely large.
 1000 ohms.
 around 500 ohms.
  Low.

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 200Hz.
 50Hz.
 100Hz.
 150Hz.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 All of the them
 Friction and windage losses
 Eddy current losses
 Hysteresis losses

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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

 KefKf2Bm2.
 Kef2KfBm2.
  Kef2Kf2Bm2.
 Kef2Kf2Bm.

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 increases.
 decreases.
 remains constant.
 decreases

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on full load.
  the generator runs on overload.
  there is no load on the generator.
  the generator runs on designed speed.

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