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Electrical Machines

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

 Normal.
 Very high.
 Zero.
 Very low.

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = sX2.
  sR2 = X2.
  R2 = s2X2.
  R2 = s2X2.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 2
 4
 8

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and high
 low and low
 high and high
 high and low

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Electrical Machines
In DC machine yoke offers

 flux path completion
 both A and B
 mechanical protection to the machine
 produce working flux

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

 leading
 zero
 unity
 lagging

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