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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 cumulative compound motors
 both B and C
 series motors
 shunt motors

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Electrical Machines
The slip of an induction motor normally does not depend on

  synchronous speed.
  shaft torque.
  rotor speed.
  core loss component.

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 350 V.
 480 V.
 400 V.
 420 V.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

  restoring torque.
 damping torque.
 synchronizing power co efficient.
 mechanical rotatory system.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

  60, 1500.
 50, 1500.
 1440, 1500.
 60, 1440.

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Electrical Machines
A single-winding single-phase motor has

 low starting torque.
 starting torque equal to full-load torque.
 high starting torque.
  zero starting torque.

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MORE MCQ ON Electrical Machines

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