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Electrical Machines

Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  magnetizing current.
  speed.
  air gap flux.
  power factor.

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 0.5Kw
 1.5KW
 2KW
 3KW

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Remain unchanged
 Decreases.
 Increases.
 None of above.

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Electrical Machines
The function of field regulator in a DC compound motor is to

 limit the armature current.
 vary the armature resistance.
 none of above.
 control field current.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Supply voltage.
  Armature current.
  Field excitaion.
  Armature voltage.

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Electrical Machines
Crawling in an induction motor is due to

  insufficient starting torque.
  space harmonics produced by winding currents.
  slip ring rotor.
  time harmonics in supply.

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