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Electrical Machines

Electrical Machines
Compensating winding is placed in the

All of these
 armature core
 pole shoe
 main field

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Electrical Machines
In escalator which motor is used?

  DC shunt motor.
  3 - φ IM.
  Universal motor.
  1 - φ IM.

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  low horse power motor.
  single phase induction motor.
  high torque motor.
  high speed motor.

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 399 V.
 100 V.
  230.2 V.
 50 V.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 20 V.
 0 V.
 60 V.

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

 10 Ω.
 8 Ω.
  2 Ω.
  4 Ω.

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MORE MCQ ON Electrical Machines

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