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 resistance was higher than critical resistance

field winding was wrongly connected

there was a break in the armature circuit

there was no residual magnetism in the field circuit

field resistance was higher than critical resistance

field winding was wrongly connected

there was a break in the armature circuit

there was no residual magnetism in the field circuit

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

shaded, shaded

shaded, unshaded

unshaded, shaded

unshaded, unshaded

shaded, shaded

shaded, unshaded

unshaded, shaded

unshaded, unshaded

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

Stator core loss

Rotational loss

Stator copper loss

All of these

Stator core loss

Rotational loss

Stator copper loss

All of these

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Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

Inserting an additional resistance in the field circuit.

Inserting an additional resistance in the armature circuit.

Any of above.

Inserting resistance to armature circuit and field circuit.

Inserting an additional resistance in the field circuit.

Inserting an additional resistance in the armature circuit.

Any of above.

Inserting resistance to armature circuit and field circuit.

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Electrical Machines
The principle of dynamically induced emf is utilized in

generator.

thermocouple.

transformer.

choke.

generator.

thermocouple.

transformer.

choke.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

1.5 to 2.

1.0.

3 to 5.

2 to 3.

1.5 to 2.

1.0.

3 to 5.

2 to 3.

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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 In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

Electrical Machines No load test on induction motor is conducted to find which of the following losses?

Electrical Machines Which of the following is done in speed control of DC motor by field flux control?

Electrical Machines The principle of dynamically induced emf is utilized in

Electrical Machines In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

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
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

Electrical Machines
The principle of dynamically induced emf is utilized in

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as