A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

there was a break in the armature circuit

there was no residual magnetism in the field circuit

field winding was wrongly connected

field resistance was higher than critical resistance

there was a break in the armature circuit

there was no residual magnetism in the field circuit

field winding was wrongly connected

field resistance was higher than critical resistance

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Electrical Machines
Cogging and crawling are phenomena associated with

any of the above.

cage induction machines and they are essentially the same.

the former at a fraction of its rate speed and the latter during starting.

the former during starting and the latter at a fraction of its rated speed.

any of the above.

cage induction machines and they are essentially the same.

the former at a fraction of its rate speed and the latter during starting.

the former during starting and the latter at a fraction of its rated speed.

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Electrical Machines
DC series motor is best suited for electric traction as

It is cheaper in cost.

It runs at very high speed at light load.

It develops high starting torque.

It consume less power.

It is cheaper in cost.

It runs at very high speed at light load.

It develops high starting torque.

It consume less power.

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Electrical Machines
An induction motor is, in general analogous to

two winding transformer with secondary short circuited.

two winding transformer with secondary open circuited.

None of these

auto transformer.

two winding transformer with secondary short circuited.

two winding transformer with secondary open circuited.

None of these

auto transformer.

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

2 and 3

1 and 3

1 and 2

1, 2 and 3

2 and 3

1 and 3

1 and 2

1, 2 and 3

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

Armature voltage control.

Any of above.

Armature resistance control.

Shunt field resistance control.

Armature voltage control.

Any of above.

Armature resistance control.

Shunt field resistance control.

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Electrical Machines

Electrical Machines A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

Electrical Machines Cogging and crawling are phenomena associated with

Electrical Machines DC series motor is best suited for electric traction as

Electrical Machines An induction motor is, in general analogous to

Electrical Machines The speed of a cumulatively compound DC motor can be controlled by varying

Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

Electrical Machines
Cogging and crawling are phenomena associated with

Electrical Machines
DC series motor is best suited for electric traction as

Electrical Machines
An induction motor is, in general analogous to

Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying