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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

  DC series.
 DC shunt.
 DC compound.
 Induction motor.

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Electrical Machines
Which motor cannot be started on no load?

 both B and C
 cumulative compound motors
 series motors
 shunt motors

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Electrical Machines
The constant losses in transformer is/are

 copper loss.
 eddy current loss.
 hysteresis loss.
 both 2 and 3.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Adding resistance to field circuit.
 Interchanging armature and field connection.
 Reversing supply connection.
 Reversing armature connection or field connection.

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

 steady and unidirectional
None of these
 oscillating
 pulsating and unidirectional

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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

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

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