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Electrical Machines

Electrical Machines
In single phase rotary converter the number of slip rings will be

 four.
 six.
 two.
 three.

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

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

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 less expensive.
 none of above.
 not suitable for rapidly changing loads.
 constant speed.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 same.
 different.
 changes.
 none of above.

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

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

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Electrical Machines
Short circuiting is caused in the armature winding due to

  grounding of two or more turns of the same coil.
  any of above.
 failure of insulation between two commutator bars.
  failure of insulation between two turns of coil.

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