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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 60°.
 120°.
 90°.
 30°.

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Direct online starting.
  Auto transformer starting.
  Rotor resistance starting.
  Stator resistance starting.

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

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

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K×R1
 R1 /K
 K²R1
 R1 /K²

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The voltage across the terminals.
 The torque required.
 None of above.
 The speed of motor.

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

 1.5 %.
  2.67 %.
 5 %.
  30 %.

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