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Electrical Machines

Electrical Machines
If a DC motor is connected across the AC supply it will

 Run at lower speed.
 Not run.
 Run at normal speed.
  Burn.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 has no relation.
 inversely.
 directly.
 none of these.

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Electrical Machines
Transformer oil is used as

 inert medium.
 an insulator.
 both A and B.
 a coolant.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be more than 10%
 be less than 10%
 remain unchanged
 be 12.5%

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 either of these
 exactly opposite
None of these
 same

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  DC supply.
  3 - Φ AC supply.
  equalizing coils.
  external star-connected resistors.

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