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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 2
 -1 < S < 1
 -2 < S < 2
 0 < S < 1

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 polarities should be same.
 both A and B.
 rating of generators should be same.
 terminal voltage should be same.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Series motor.
  Cumulative compound motor.
  Shunt motor.
  Differential compound motor.

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Electrical Machines
The armature shaft must be able to withstand

 any unbalanced magnetic pull on the armature core.
All of these
 bending moment due to weight of the armature.
 twisting strains due to transmission of torque.

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

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

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC Shunt motor.
 DC series motor.
 DC compound motor.
 Separately excited DC motor.

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