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 no residual magnetism in the field circuit

field resistance was higher than critical resistance

there was a break in the armature circuit

field winding was wrongly connected

there was no residual magnetism in the field circuit

field resistance was higher than critical resistance

there was a break in the armature circuit

field winding was wrongly connected

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

40 V.

0 V.

60 V.

20 V.

40 V.

0 V.

60 V.

20 V.

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

4 V

0 V

1 V

2 V

4 V

0 V

1 V

2 V

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Electrical Machines
What are the starters used for starting of cage motors?

All of these.

DOL starter.

Star-delta starter.

Auto transformer starter.

All of these.

DOL starter.

Star-delta starter.

Auto transformer starter.

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Electrical Machines
A 3 - ÃŽÂ¦, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

2 Hz.

50 Hz.

3 Hz.

10 Hz.

2 Hz.

50 Hz.

3 Hz.

10 Hz.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The armature of DC motor is laminated

to reduce the hysteresis loss.

to reduce the mass.

to reduce the eddy current loss.

to reduce the inductor.

to reduce the hysteresis loss.

to reduce the mass.

to reduce the eddy current loss.

to reduce the inductor.

ANSWER DOWNLOAD EXAMIANS APP

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 A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

Electrical Machines Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

Electrical Machines What are the starters used for starting of cage motors?

Electrical Machines A 3 - ÃŽÂ¦, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

Electrical Machines The armature of DC motor is laminated

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
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

Electrical Machines
What are the starters used for starting of cage motors?

Electrical Machines
A 3 - ÃŽÂ¦, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

Electrical Machines
The armature of DC motor is laminated