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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

 both 1 and 2
None of these
 lap winding
 wave winding

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 cross – magnetizing.
 magnetizing.
  demagnetizing.
 ineffective.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 full wave controlled
 half wave
 half wave controlled
 full wave

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary short circuited.
None of these
 two winding transformer with secondary open circuited.
 auto transformer.

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Electrical Machines
If the excitation is reduced, the power factor is

None of these
 unity power factor
 lagging power factor
 leading power factor

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide overload protection.
 provide protection against Low-Voltage.
 limit the starting current to a safer value.
 all of above.

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