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Electrical Machines

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

 Very low.
 Very high.
 Normal.
 Zero.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in parallel with the shunt field
 in series with the shunt field
 in parallel with the series field
 in series with the series field

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 power.
 speed.
 torque.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 234.76 N-m.
 cant be determined.
 133.22 N-m
 266.20 N-m.

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
 In parallel with the armature winding.
  In series with the armature winding.
 As a separate unit.

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Electrical Machines
A generator may loose residual magnetism due to

  vibrations.
  over excitation.
  heating.
  any of these.

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MORE MCQ ON Electrical Machines

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