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Electrical Machines

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

 1/(1-S)
 S
 1-S
 1/S

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Electrical Machines
In an ideal DC generator the regulation is

 low.
 zero.
 positive.
 high.

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Electrical Machines
In shapers and slotters which motor are preferred?

  Slip ring IM.
  Double cage motor.
  Synchronous motor.
  Squirrel cage IM.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 provide execessive voltage drop in line.
 draw a starting current many times its rated full load current.
 damage the armature and commutator.
 all of above.

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 any of above method.
 rheostatic control.
 none of above.
 Ward Leonard control.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.
  transposing any two leads from supply.

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