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Electrical Machines

Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  increased.
  none of these.
  reversed.
  modified.

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 start automatically without trouble.
 get damaged.
 not start automatically.
 develop very low starting torque.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

All of these
 zero
 minimum
 maximum

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 1.92
 0.08
 -0.08
 -1.92

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Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 cast iron.
 copper.
 mica.

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

 food mixers
 tape recorders
 personal computers as cooling fan
 wet grinders

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