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

2 alone

1, 2 and 3

1 and 2

1 and 3

2 alone

1, 2 and 3

1 and 2

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

primary = 301 A, secondary = 22.7 A

primary = 22.7 A, secondary = 602.4 A

primary = 602 A, secondary = 22.7 A

primary = 11.4 A, secondary = 301 A

primary = 301 A, secondary = 22.7 A

primary = 22.7 A, secondary = 602.4 A

primary = 602 A, secondary = 22.7 A

primary = 11.4 A, secondary = 301 A

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Electrical Machines
The wattage rating of a ceiling fan motor will be

10 - 20 W.

250 - 500 W.

200 - 250 W.

50 - 150 W.

10 - 20 W.

250 - 500 W.

200 - 250 W.

50 - 150 W.

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Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

armature winding has thin leads whereas field winding has thick leads

both the windings have thin leads

armature winding has thick leads whereas field winding has thin leads

both the windings have thick leads

armature winding has thin leads whereas field winding has thick leads

both the windings have thin leads

armature winding has thick leads whereas field winding has thin leads

both the windings have thick leads

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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?

None of these

K × input power

(1-K) × input power

both A and B

None of these

K × input power

(1-K) × input power

both A and B

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Electrical Machines
In a DC generator if field winding attains the critical resistance

machine will generate maximum voltage.

field winding will burn.

the voltage generated will be zero.

machine will generate maximum power.

machine will generate maximum voltage.

field winding will burn.

the voltage generated will be zero.

machine will generate maximum power.

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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 A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

Electrical Machines The wattage rating of a ceiling fan motor will be

Electrical Machines A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

Electrical Machines In auto transformer if the turn ratio is K, what is the power transferred inductively?

Electrical Machines In a DC generator if field winding attains the critical resistance

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
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

Electrical Machines
The wattage rating of a ceiling fan motor will be

Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?

Electrical Machines
In a DC generator if field winding attains the critical resistance