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Electrical Machines

Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

 0.70 Hz.
  0.65 Hz.
 0.75 Hz.
  60 Hz.

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Electrical Machines
Regenerative braking is not found in which motor?

 DC compound.
 Induction motor.
  DC series.
 DC shunt.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

  Effiency.
 Running Torque.
 Starting torque.
 Speed regulation.

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 4KVA
 0KVA
 16KVA

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Electrical Machines
DC series motor is best suited for electric traction as

  It develops high starting torque.
 It consume less power.
 It is cheaper in cost.
 It runs at very high speed at light load.

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the armature current will reduce.
 the motor will come to stop.
 the motor will attain dangerously high speed.
 the speed of motor will be reduced.

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