Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

1 and 3

1, 2 and 3

2 alone

1 and 2

1 and 3

1, 2 and 3

2 alone

1 and 2

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

10%

21%

11%

41%

10%

21%

11%

41%

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

100 Ω

50 Ω

10 Ω

0.1 Ω

100 Ω

50 Ω

10 Ω

0.1 Ω

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Electrical Machines
Secondary winding of an auto transformer is also called

common winding.

compensating winding.

damping winding.

tertiary winding.

common winding.

compensating winding.

damping winding.

tertiary winding.

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

3200 W and 2500 W

1600 W and 5000 W

1600 W and 1250 W

3200 W and 5200 W

3200 W and 2500 W

1600 W and 5000 W

1600 W and 1250 W

3200 W and 5200 W

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Electrical Machines
In case of 3 - ÃŽÂ¦ IM, plugging means

pulling the motor directly on line without a rotor.

locking of rotor due to harmonics.

interchanging two supply phases for quick stopping.

starting the motor on load which is more than the rated load.

pulling the motor directly on line without a rotor.

locking of rotor due to harmonics.

interchanging two supply phases for quick stopping.

starting the motor on load which is more than the rated load.

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Electrical Machines

Electrical Machines Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

Electrical Machines What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

Electrical Machines The field divertor resistance for a DC series motor is of order of

Electrical Machines Secondary winding of an auto transformer is also called

Electrical Machines The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

Electrical Machines In case of 3 - ÃŽÂ¦ IM, plugging means

Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

Electrical Machines
The field divertor resistance for a DC series motor is of order of

Electrical Machines
Secondary winding of an auto transformer is also called

Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

Electrical Machines
In case of 3 - ÃŽÂ¦ IM, plugging means