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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
  0.05.
 20.
  0.905.

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 become execessively high.
 remain unaltered.
 increase.
 decrease.

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 110 VA
 100 VA
 550 VA

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

None of these
 constant supply voltage V, starting torque Tst decreases
 either of these
 constant V, Tst increases

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  continue running in the same direction as before.
  not run.
  run in a direction opposite to previous one.
  get damaged.

ANSWER DOWNLOAD EXAMIANS APP
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