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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

 None of these.
 No load.
 Low load.
  Full load.

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Electrical Machines
In escalator which motor is used?

  1 - φ IM.
  3 - φ IM.
  Universal motor.
  DC shunt motor.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 synchronous generator.
 synchronous motor.
 induction motor.
  induction generator.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Both torque and speed decrease.
  Torque increase and speed decrease.
 Torque decrease and speed increases.
 Torque and speed both increase.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 remains constant.
 increases with increase in the load torque.
 decreases with increase in the load torque.
 decreases with decrease in the load torque.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 lap winding
 closed winding
 open type winding
 wave winding

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