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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 increases.
 remains constant.
 decreases
 decreases.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  1440 to 2880.
  375 to 500.
  500 to 720.
  720 to 920.

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

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

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 locking.
 cogging.
 plugging.
 crawling.

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and direct axis
 direct axis and interpolar axis
 direct axis and indirect axis
 quadrature axis and interpolar axis

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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

 150 Ω.
  375 Ω.
 225 Ω.
 145 Ω.

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MORE MCQ ON Electrical Machines

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