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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

 Lathes.
 Blowers and fans.
  All of this.
 Centrifugal pumps

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K²
 K×R1
 R1 /K
 K²R1

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

  line to ground fault.
 3 - phase to ground fault.
 3 - phase fault.
 line to line fault.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 running torque.
 starting torque.
 efficiency.
 speed regulation.

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

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

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Electrical Machines
A shaded pole single phase induction motor can be used for

 tape recorders
 wet grinders
 food mixers
 personal computers as cooling fan

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MORE MCQ ON Electrical Machines

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