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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f3.
  f.
 f2.
 f1.5.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

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

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

All of these
 supply voltage and field current at constant excitation
 power factor and dc excitation at constant load
 power factor and supply voltage during hunting

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Electrical Machines
Diverters are used only in

 either of these
 shunt motors
 series motors
None of these

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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

  2 Ω.
 8 Ω.
  4 Ω.
 10 Ω.

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Electrical Machines
Which of the following motor is used in grinders?

  Synchronous motor.
  Split phase IM.
  Capacitor start IM.
  Capacitor start capacitor run IM.

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MORE MCQ ON Electrical Machines

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