A 3-φ alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed, a field current of If1 is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current

Electrical Machines
A 3-φ alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed, a field current of If1 is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current

Would be equal to If1/2.

Would be equal to If1.

Cannot be predicted due to insufficient data.

Woud be equal to 2If1.

Would be equal to If1/2.

Would be equal to If1.

Cannot be predicted due to insufficient data.

Woud be equal to 2If1.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

500W

100W

3000W

1000W

500W

100W

3000W

1000W

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

P = 50, s = 4.43 %.

P = 60, s = 0.96 %.

P = 20, s = 3.33 %.

P = 40, s = 5.79 %.

P = 50, s = 4.43 %.

P = 60, s = 0.96 %.

P = 20, s = 3.33 %.

P = 40, s = 5.79 %.

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Electrical Machines
In DC generator, full form of MNA is what?

Magnetic no-load axis.

Magnetically no-load armature co-ordinate.

Magnetic neutral armature co-ordinate.

Magnetic neutral axis.

Magnetic no-load axis.

Magnetically no-load armature co-ordinate.

Magnetic neutral armature co-ordinate.

Magnetic neutral axis.

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Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

Ph will increase but Pe will decrease

Pe will increase but Ph will decrease

Ph will decrease but Pe will remain same

both hysteresis loss(Ph) and eddy current loss(Pe) will increase

Ph will increase but Pe will decrease

Pe will increase but Ph will decrease

Ph will decrease but Pe will remain same

both hysteresis loss(Ph) and eddy current loss(Pe) will increase

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

Vmax to Imax.

Vmin to Imax.

Vmin to Imin.

Vmax to Imin.

Vmax to Imax.

Vmin to Imax.

Vmin to Imin.

Vmax to Imin.

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Electrical Machines

Electrical Machines A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

Electrical Machines A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

Electrical Machines In DC generator, full form of MNA is what?

Electrical Machines If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

Electrical Machines Quadrature axis synchronous reactance is the ratio of

Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

Electrical Machines
In DC generator, full form of MNA is what?

Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

Electrical Machines
Quadrature axis synchronous reactance is the ratio of