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Electrical Machines

Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 RBY
 BYR
All of these
 BRY

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Electrical Machines
Which type motors are preferred for lathes?

 Squirrel Cage induction motor.
 Either A or B.
 Synchronous motor.
 DC shunt motors.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 shaded, unshaded
 unshaded, shaded
 shaded, shaded
 unshaded, unshaded

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Electrical Machines
In double cage induction motor, the outer cage offers

  low resistance and low reactance.
  high resistance and high reactance.
  low resistance and high reactance.
  high resistance and low reactance.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T∝ V²
 T ∝ 1/V
 T ∝ 1/V²
 T ∝ V

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 severe sparking.
 imperfect contact.
 rough commutator surface.
 any of above.

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