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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 zero
 lagging
 unity
 leading

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Electrical Machines
In DC machine torque depends on which of the following?

 flux (φ)
 both A and B
 armature current (I)
 speed

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Electrical Machines
At stand still condition the value of slip is

 0
 finite value
 1
 infinite value

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Stator winding.
  Both rotor and stator winding.
  Rotor winding.
  Rotor mmf wave.

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

  0.5 times the synchronous speed.
  (1 / 5) times the synchronous speed.
 5 times the synchronous speed.
 (1 / 15) times the synchronous speed.

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 48.0%.
 59.2%.
 88.8%.
 57.1%.

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MORE MCQ ON Electrical Machines

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