The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

14.28 and 5.54 ÃŽÂ©.

14.28 and 9.60 ÃŽÂ©.

8.248 and 9.60 ÃŽÂ©.

8.248 and 5.54 ÃŽÂ©.

14.28 and 5.54 ÃŽÂ©.

14.28 and 9.60 ÃŽÂ©.

8.248 and 9.60 ÃŽÂ©.

8.248 and 5.54 ÃŽÂ©.

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Electrical Machines
In large sized DC machines the compensating windings are provided to

reduce eddy current losses by providing local short circuits.

compensate for the decrease in speed due to increase of load.

None of these

neutralize voltage induced in coil due to fluctuation of l

reduce eddy current losses by providing local short circuits.

compensate for the decrease in speed due to increase of load.

None of these

neutralize voltage induced in coil due to fluctuation of l

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Electrical Machines
Unbalance 3 - ÃŽÂ¦ stator currents cause

heating of rotor.

vibrations.

double frequency currents in the rotor.

All of these

heating of rotor.

vibrations.

double frequency currents in the rotor.

All of these

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Electrical Machines
An IM cannot run at synchronous speed because

rotor torque will not be produced.

induction motor will become synchronous motor.

none of above.

air friction will prevent it.

rotor torque will not be produced.

induction motor will become synchronous motor.

none of above.

air friction will prevent it.

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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.

399 V.

100 V.

230.2 V.

50 V.

399 V.

100 V.

230.2 V.

50 V.

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Electrical Machines
Width of a carbon brush should be equal to

the width of the 2 to 3 commutator segment.

the width more than 3 commutator segment.

less than the width of commutator segment.

the width of the 1 to 2 commutator segment.

the width of the 2 to 3 commutator segment.

the width more than 3 commutator segment.

less than the width of commutator segment.

the width of the 1 to 2 commutator segment.

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Electrical Machines

Electrical Machines The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

Electrical Machines In large sized DC machines the compensating windings are provided to

Electrical Machines Unbalance 3 - ÃŽÂ¦ stator currents cause

Electrical Machines An IM cannot run at synchronous speed because

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 Width of a carbon brush should be equal to

Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

Electrical Machines
In large sized DC machines the compensating windings are provided to

Electrical Machines
Unbalance 3 - ÃŽÂ¦ stator currents cause

Electrical Machines
An IM cannot run at synchronous speed because

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
Width of a carbon brush should be equal to