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

field winding was wrongly connected

field resistance was higher than critical resistance

there was no residual magnetism in the field circuit

there was a break in the armature circuit

field winding was wrongly connected

field resistance was higher than critical resistance

there was no residual magnetism in the field circuit

there was a break in the armature circuit

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

8.

4.

2.

1.

8.

4.

2.

1.

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Electrical Machines
The armature mmf of a DC machine has

triangular space distribution and rotates at the speed of armature.

stepped distribution and rotates at the speed of armature.

trapezoidal space distribution and is stationary in space.

triangular space distribution and is stationary in space.

triangular space distribution and rotates at the speed of armature.

stepped distribution and rotates at the speed of armature.

trapezoidal space distribution and is stationary in space.

triangular space distribution and is stationary in space.

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Electrical Machines
Voltage regulation of transformer is given by

(E2 - V2) / E2

(V2 - E2) / V2

(V2 - E2) / E2

(E2 - V2) / V2

(E2 - V2) / E2

(V2 - E2) / V2

(V2 - E2) / E2

(E2 - V2) / V2

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Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

The direction of rotation will reverse.

The motor will stop.

The motor will run much faster in the same direction.

The motor will run at its normal speed in the same direction as before.

The direction of rotation will reverse.

The motor will stop.

The motor will run much faster in the same direction.

The motor will run at its normal speed in the same direction as before.

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Electrical Machines
A short circuit test on a transformer gives

copper loss at over load.

copper loss at any load.

copper loss at full load.

copper loss at half load.

copper loss at over load.

copper loss at any load.

copper loss at full load.

copper loss at half load.

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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 If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

Electrical Machines The armature mmf of a DC machine has

Electrical Machines Voltage regulation of transformer is given by

Electrical Machines When the supply terminal of a DC shunt motor are interchanged

Electrical Machines A short circuit test on a transformer gives

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
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

Electrical Machines
The armature mmf of a DC machine has

Electrical Machines
Voltage regulation of transformer is given by

Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

Electrical Machines
A short circuit test on a transformer gives