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Electrical Machines

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  16.67 Hz.
  25 Hz.
  50 Hz.
  60 Hz.

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

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

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1 and 2
 1 and 3
 1, 2 and 3
 2 and 3

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Electrical Machines
In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will

 remain constant.
 any of the above.
 increase.
 decrease.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  crossmagnetising.
  magnetising.
  none of above.
 demagnetising.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 570 A.
 460 A.
 340 A.
 250 A.

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