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Electrical Machines

Electrical Machines
From no load to full load the slip will

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

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Electrical Machines
Width of a carbon brush should be equal to

 the width more than 3 commutator segment.
 the width of the 1 to 2 commutator segment.
 less than the width of commutator segment.
 the width of the 2 to 3 commutator segment.

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Electrical Machines
Short circuiting is caused in the armature winding due to

 failure of insulation between two commutator bars.
  failure of insulation between two turns of coil.
  grounding of two or more turns of the same coil.
  any of above.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 flat-topped
 sinusoidal
 co- sinusoidal
 rectangular

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

 225 Ω.
  375 Ω.
 150 Ω.
 145 Ω.

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Electrical Machines
Which of the following statements are correct ?

 Both 1 and 2.
 A small value of leakage reactance will increase the maximum power output of motor.
None of these
 The leakage reactance of the induction motor should be small.

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MORE MCQ ON Electrical Machines

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