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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
  0.05.
  0.905.
 20.

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what more than 230 V
 not possible
 some what less than 230 V
 230 V

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Electrical Machines
The type of DC motor used for shears and punches is

 Differential compound motor.
 Series motor.
 Shunt motor.
  Cummulative compound motor.

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

None of these
 either increase or decrease
 increase
 decrease

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Electrical Machines
The armature MMF waveform of a DC machine is

  pulsating.
  sinusoidal.
  rectangular.
  triangular.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 none of these.
 has no relation.
 directly.
 inversely.

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