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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC generator
 DC motor
 AC generator
 induction motor

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Electrical Machines
Which machine is used for battery charging?

 None of these.
 DC shunt generator.
 DC series generator.
 Compounded DC generator.

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 in reverse.
  to a DC source.
 to an AC source.
 to earth.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 field current control
 supply voltage control
All of these
 armature circuit resistance control

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Electrical Machines
The stator frame in an induction motor is used to

  provide return path for the flux.
  protect the whole machine.
  hold armature stamping in position.
  ventilate the armature.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3.33%
 +3%
 -3%
 -3.33%

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