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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 induction motor
 AC generator
 DC motor
 DC generator

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Low.
  Same as full load.
  Equal to 1.
  High.

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

 saddle shape
 peaky in nature
 sine wave
 flat tapped or trapezoidal

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Electrical Machines
What are the starters used for starting of cage motors?

  All of these.
 DOL starter.
 Star-delta starter.
 Auto transformer starter.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 384 V
 192 V
 768 V
 96 V

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 differentially compounded generator
 cumulatively compounded generator
 shunt generator
 series generator

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