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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 1 - s.
  2 - s.
 2 + s.
  s.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

  13.5 A.
 27 A.
 23 A.
 11.5 A.

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Electrical Machines
What are the starters used for starting of cage motors?

 DOL starter.
 Star-delta starter.
 Auto transformer starter.
  All of these.

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Electrical Machines
In alternator, the rotary part is

 core.
 none of these.
 armature.
  magnetic field poles.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt generator.
 DC shunt motor.
  DC series motor.
  DC series generator.

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 S
 1/(1-S)
 1-S

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