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Electrical Machines

Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  1/Ia.
  Ia.
  Ia2.
  √Ia.

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the speed of motor will be reduced.
 the armature current will reduce.
 the motor will attain dangerously high speed.
 the motor will come to stop.

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

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

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 4 time the initial value
 1/2 of the initial value
 twice the initial value
 1/4 of the intial value

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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Circle about the origin.
 Rectangular hyperbola
 Straight line through the origin.
 Straight line parallel to the speed axis.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Parallel.
  Series.
 Compound.
 None of the options.

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