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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  1.
  0.54.
 0.3.
 0.7.

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

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

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Electrical Machines
Which of the following induction motor has the highest starting torque?

None of these
 Squirrel cage induction motor.
 Same in both induction motors.
 Slip ring induction motor.

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Ra maximum and Rf minimum
 Ra maximum and Rf maximum
 Ra minimum and Rf minimum
 Rf maximum and Ra minimum

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Electrical Machines
Slip exists in

  synchronous motor.
  induction motor.
  in both machines.
  none of above.

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Electrical Machines
Conservator tank is used

 to take up the expansion of oil due to temperature rise.
 to act as an oil storage.
None of these
 for better cooling of transformer.

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