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Electrical Machines

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

 Very high.
 Normal.
 Zero.
 Very low.

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 60 Hz
 40 HZ
 25 Hz
 50 Hz

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed rises.
 deteriorate and the speed rises.
 deteriorate and the speed falls.
 improve and the speed falls.

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Electrical Machines
In DC machine torque is proportional to which of the following?

 flux(φ)
 both A and B
 armature current(Ia)
None of these

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

 20 Hz.
  30 Hz.
  Can be determined.
 35 Hz.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 saddle shape
 triangular
 flat tapped or trapezoidal
 peaky in nature

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MORE MCQ ON Electrical Machines

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