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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
 remains same.
None of these
 decreases.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

 1.5 %.
  less than 1 %.
  zero.
 4 %.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 500 rpm
 250 rpm
 1000 rpm
 2000 rpm

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Electrical Machines
The flux involved in the emf equation of a transformer has

 average value.
 total value.
 rms value.
  maximum value.

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Armature current.
 Induced emf.
 Mechanical power.
 Can not be determined.

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Electrical Machines
Damper winding is used to

 both 1 and 2.
 decrease the load current.
 suppress the hunting.
 increase the load current.

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