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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  2.5 %.
 10 %.
  15 %.
  20 %.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 less than normal speed.
 more than normal speed.
 zero.
 normal speed.

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 Synchronous impedance method
 ZPF method
 American standard association method
 MMf method

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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to half the applied voltage.
 Back emf is equal to applied voltage.
 None of above.
 Back emf is equal to zero.

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 5 - 10 F.
  1 - 2 µF.
  2 - 3 µF.
 0.1 µF.

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  not run.
  make noise.
  get over heated.
  run normally.

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MORE MCQ ON Electrical Machines

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