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Electrical Machines

Electrical Machines
From no load to full load the slip will

None of these
 not change.
 slightly decrease.
 slightly increase.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  remains constant.
 increases.
  decreases.
  increases upto a limit and then remains almost constant.

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Electrical Machines
Commutators in DC machines have a role of which converts

 AC to DC.
 high voltage DC to low voltage DC.
 Both AC to DC and DC to AC.
 none of these.

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  silicon steel.
  aluminium.
  stainless steel.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.9 lag
 0.2 lead
 unity
 0.2 lag

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Ward-Leonard control.
 Multiple voltage control.
 Field control.
 Armature control.

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