The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

2, 4

1, 4

2, 3

1, 3

2, 4

1, 4

2, 3

1, 3

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

100 V.

399 V.

50 V.

230.2 V.

100 V.

399 V.

50 V.

230.2 V.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

96%

94%

92%

95%

96%

94%

92%

95%

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

1/√5

1/√2

2/√5

1/3

1/√5

1/√2

2/√5

1/3

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Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

armature resistance, effect of armature reaction.

armature resistance, inter poles, armature.

reduction in field current, effect of armature reaction, armature.

armature resistance, effect of armature reaction.

armature resistance, inter poles, armature.

reduction in field current, effect of armature reaction, armature.

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Electrical Machines
Hysteresis loss will depends on

f1.6

f

f²

f³

f1.6

f

f²

f³

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Electrical Machines

Electrical Machines A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

Electrical Machines A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

Electrical Machines In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

Electrical Machines The factors that are responsible for decrease in terminal voltage of a shunt generator are

Electrical Machines Hysteresis loss will depends on

Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

Electrical Machines
Hysteresis loss will depends on