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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

 both 1 and 2
 non reversing drive
None of these
 reversing drive

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = s2X2.
  R2 = sX2.
  sR2 = X2.
  R2 = s2X2.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/√3, 1/3
 1/3, 1/3
 1/√3, 1/√3
 1/3, 1/√3

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Electrical Machines
Induction motor operation depends on

 rotating magnetic field.
 stationary magnetic field.
None of these
 either of these.

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 two.
 infinity.
  unity.
 zero.

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Electrical Machines
A crusher is equipped with

 Slip ring induction motor.
 Reluctance motor.
 Synchronous motor.
 DC shunt motor.

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