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, 2 and 3

1 and 2

2 alone

1 and 3

1, 2 and 3

1 and 2

2 alone

1 and 3

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Electrical Machines
The output power of a dc motor is given by

EbIa.

EIa.

none of these.

EbIa2.

EbIa.

EIa.

none of these.

EbIa2.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

20.

0.905.

0.05.

1.1.

20.

0.905.

0.05.

1.1.

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Electrical Machines
Which of the following represents the rotating losses of machine?

Friction and windage losses

Hysteresis losses

Eddy current losses

All of the them

Friction and windage losses

Hysteresis losses

Eddy current losses

All of the them

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Electrical Machines
In a 3 - ÃŽÂ¦ IM in order to eliminate cogging the number of stator slots must be

unequal to number of rotor slots and skewed in shape.

either (B) or (C).

an integral multiple of number of rotor slots.

equal to number of rotor slots.

unequal to number of rotor slots and skewed in shape.

either (B) or (C).

an integral multiple of number of rotor slots.

equal to number of rotor slots.

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Electrical Machines
No load primary current in a transformer

leads the applied voltage by exactly 90Ã‚&

lags behind applied voltage by exactly 90Ã‚&am

leads the applied voltage somewhat less than 90Ã&

lags behind applied voltage somewhat less than 90Ã

leads the applied voltage by exactly 90Ã‚&

lags behind applied voltage by exactly 90Ã‚&am

leads the applied voltage somewhat less than 90Ã&

lags behind applied voltage somewhat less than 90Ã

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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 The output power of a dc motor is given by

Electrical Machines What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

Electrical Machines Which of the following represents the rotating losses of machine?

Electrical Machines In a 3 - ÃŽÂ¦ IM in order to eliminate cogging the number of stator slots must be

Electrical Machines No load primary current in a transformer

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
The output power of a dc motor is given by

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

Electrical Machines
Which of the following represents the rotating losses of machine?

Electrical Machines
In a 3 - ÃŽÂ¦ IM in order to eliminate cogging the number of stator slots must be

Electrical Machines
No load primary current in a transformer