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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

 Lathes.
  All of this.
 Blowers and fans.
 Centrifugal pumps

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 become zero
 remain the same
 decrease
 increase

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  DC series motor.
  Single phase induction motor.
  Synchronous motor.
  AC slip ring motor.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 3
 1/√3
 √3
 1/3

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Electrical Machines
The armature of DC motor is laminated

 to reduce the hysteresis loss.
 to reduce the inductor.
 to reduce the eddy current loss.
 to reduce the mass.

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  rotor at slip rings.
  starting resistance in the starter.
  stator phases of the motor.
None of these

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