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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  less maintenance.
  less cost.
  all of below.
  simple in construction.

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 14 HP.
 15 HP.
  10 HP.
  13 HP.

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 between zero and infinity.
 approach zero.
 aprroach infinity.
 remain unchanged.

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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

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

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Electrical Machines
Sparkless commutation can be achieved by employing

  inter poles.
 compensating winding.
  high resistance carbon brushes.
  any one or more of the above methods.

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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 will

 increase.
 remains same.
 Decrease.d
 none of these.

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