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Electrical Machines

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 500.
 2000.
 0.
 1000.

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Electrical Machines
A series motor is efficiently suitable for

  high starting torque operation.
 low starting torque operation.
 none of these.
 constant speed operation.

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Electrical Machines
Drop in speed from no load to full load is very high in

 Series motor with interpoles.
 Shunt motor with interpoles.
 Cummulative compound motor with interpoles.
  Series motor without interpoles.

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Electrical Machines
Breadth factor is defined as the ratio of

 emf with concentrated winding to emf with distributed winding.
 emf with distributed winding to emf with concentrated winding.
None of these
 both 1 and 2.

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Electrical Machines
In DC machine torque is proportional to which of the following?

None of these
 flux(φ)
 armature current(Ia)
 both A and B

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Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 mica.
 cast iron.
 copper.

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MORE MCQ ON Electrical Machines

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