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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 40 A.
 44 A.
 440 A.

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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
 50 Hz
 40 HZ
 25 Hz

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage and frequency
 supply voltage and load
 supply voltage, frequency and load
 supply voltage

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Electrical Machines
In DC generator, brushes are always placed along

 geometrical neutral axis.
 load axis.
 armature axis.
  magnetic neutral axis.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V²
 f
 V
 f²

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Electrical Machines
A smaller air gap in a induction motor helps to

 reduce the chance of cogging.
 increase the starting torque.
 reduce the chance of crawling.
 reduce the magnetizing current.

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MORE MCQ ON Electrical Machines

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