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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  None of them.
  Series.
  Shunt.
  Compound.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave controlled
 full wave
 full wave controlled
 half wave

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KVA.
  Output power at the shaft.
 Gross power.
 Power drawn in KW.

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has a almost constant speed.
 Has a poor torque.
 Has its field winding consinting of thick wire and less no of turns.
 Can be started easily without load.

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Electrical Machines
Regenerative braking is possible in

 DC series motor.
  DC shunt motor with field weakening control.
 DC compound motor.
 DC shunt motor with armature resistance control.

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

  30 %.
 1.5 %.
 5 %.
  2.67 %.

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