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Electrical Machines

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

 zero
 unity
 leading
 lagging

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

 Compound.
 None of the options.
  Series.
 Parallel.

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Electrical Machines
In DC machines shape of net flux density is?

 saddle shape
 peaky in nature
 flat tapped or trapezoidal
 sine wave

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

 Very high.
 Very low.
 Zero.
 Normal.

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Electrical Machines
Induction motor operation depends on

 rotating magnetic field.
 either of these.
None of these
 stationary magnetic field.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 Remains same.
 Increase.
 None of these.
  Decrease.

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