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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 1
 -1 < S < 1
 -2 < S < 2
 0 < S < 2

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Electrical Machines
Which of the following statements is/are correct ?

None of these
 Both A and B.
 Inter pole winding will act in interpolar region.
 Compensating winding will act under the pole.

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  None of these.
  Can't be determined.
  15 N.
 20 N.

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

  Back emf is equal to half of applied voltage.
 Back emf is equal.
 back emf is equal to applied voltage.
 None of above.

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Electrical Machines
Rotating part of DC motor is known as

 Armature.
 Pole.
 Carbone brush.
 Starter.

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Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 mica.
 cast iron.
 copper.

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