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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

 8 pole.
 4 pole.
  2 pole.
 6 pole.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both increase
 both decrease
 decrease and increase respectively
 increase and decrease respectively

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  capacitor start induction motor.
  transformer with secondary short circuited.
  synchronous motor.
  repulsion start induction motor.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

 pole chamfering
All of these
 pole stacking
 compensating winding

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Electrical Machines
The functions of inter poles are

None of these
 nullify reactance voltage and improve the commutation.
 both 1 and 2
 reduce cross magnetization effect and improve commutation

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 no load
 full load
 any of the above
 half load

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