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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cosδ
 sinδ
 cos2δ
 sin2δ

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 18.18% increase
 36.36% increase
 36.36% increase
 36.36% decrease

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC compound motor.
 DC Shunt motor.
 DC series motor.
 Separately excited DC motor.

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Electrical Machines
The crawling in the induction motor is caused by

 high loads
 harmonics developed in the motor
 improper design of stator laminations
 low voltage supply

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Electrical Machines
Which of the following motors is/are widely used?

 slip ring induction motor
 squirrel cage induction motor
None of these
 either of these

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Electrical Machines
The torque developed in IM is nearly proportional to

 1 / V2.
  V.
  V2.
  1 / V.

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