A 3-φ alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed, a field current of If1 is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current

Electrical Machines
A 3-φ alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed, a field current of If1 is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current

Would be equal to If1/2.

Woud be equal to 2If1.

Would be equal to If1.

Cannot be predicted due to insufficient data.

Would be equal to If1/2.

Woud be equal to 2If1.

Would be equal to If1.

Cannot be predicted due to insufficient data.

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Electrical Machines
In case of DC shunt motor if load is reduced

The speed will increase abruptly.

The speed will increase in proportion to reduction in load.

The speed will remains almost constant.

DC Shunt Motor

The speed will increase abruptly.

The speed will increase in proportion to reduction in load.

The speed will remains almost constant.

DC Shunt Motor

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

zig - zag connection.

star connection.

delta connection.

V connection.

zig - zag connection.

star connection.

delta connection.

V connection.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

shaft rotation is high.

rate of change of flux is minimum.

rate of change of flux is maximum.

induced voltage is high.

shaft rotation is high.

rate of change of flux is minimum.

rate of change of flux is maximum.

induced voltage is high.

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

decreased.

remains unchanged.

kept constant to certain value.

increased.

decreased.

remains unchanged.

kept constant to certain value.

increased.

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Electrical Machines
Dynamic braking is employed to brake

None of these

non reversing drive

both 1 and 2

reversing drive

None of these

non reversing drive

both 1 and 2

reversing drive

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Electrical Machines

Electrical Machines In case of DC shunt motor if load is reduced

Electrical Machines 3rd harmonics are eliminated in induction motor by using

Electrical Machines In a DC generator the emf generated by the armature is maximum when

Electrical Machines In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

Electrical Machines Dynamic braking is employed to brake

Electrical Machines
In case of DC shunt motor if load is reduced

Electrical Machines
3rd harmonics are eliminated in induction motor by using

Electrical Machines
In a DC generator the emf generated by the armature is maximum when

Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

Electrical Machines
Dynamic braking is employed to brake