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 2

1 and 3

1, 2 and 3

2 alone

1 and 2

1 and 3

1, 2 and 3

2 alone

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

supply voltage and field current at constant excitation

power factor and dc excitation at constant load

All of these

power factor and supply voltage during hunting

supply voltage and field current at constant excitation

power factor and dc excitation at constant load

All of these

power factor and supply voltage during hunting

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

equalizer rings.

graphite brushes.

commutator with large number of segments.

carbon brushes.

equalizer rings.

graphite brushes.

commutator with large number of segments.

carbon brushes.

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Electrical Machines
Cross magnetization effects which of the following?

reduction in main field flux

reduces the terminal voltage

both 2 and 3

commutation

reduction in main field flux

reduces the terminal voltage

both 2 and 3

commutation

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Electrical Machines
The commutator segments of DC machines are made up of

brass

copper

hard-drawn copper

copper alloy

brass

copper

hard-drawn copper

copper alloy

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

commutator.

solid connection.

none of above.

slip rings.

commutator.

solid connection.

none of above.

slip rings.

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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 An inverted V-curve of synchronous motor shows the variation of

Electrical Machines In a DC generator, the ripples in the direct emf generated are reduced by employing

Electrical Machines Cross magnetization effects which of the following?

Electrical Machines The commutator segments of DC machines are made up of

Electrical Machines In DC generators, electric current to the external circuit from armature is given through

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
An inverted V-curve of synchronous motor shows the variation of

Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

Electrical Machines
Cross magnetization effects which of the following?

Electrical Machines
The commutator segments of DC machines are made up of

Electrical Machines
In DC generators, electric current to the external circuit from armature is given through