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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very high.
 Normal.
 Very low.
 Zero.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
 cummulative compound motor.
 AC synchronous motor.
  series motor.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 S.Ns
 Ns
 Zero

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

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

  0.573.
 0.443.
 0.512.
 0.649.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/√5
 1/3
 1/√2
 2/√5

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MORE MCQ ON Electrical Machines

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