The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Electrical Machines
The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Xd = 9.6Ω and Xq = 9Ω

Xd = 8Ω and Xq = 10.8Ω

Xd = 10.8Ω and Xq = 8Ω

Xd = 9Ω and Xq = 9.6Ω

Xd = 9.6Ω and Xq = 9Ω

Xd = 8Ω and Xq = 10.8Ω

Xd = 10.8Ω and Xq = 8Ω

Xd = 9Ω and Xq = 9.6Ω

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Electrical Machines
Which motor cannot be started on no load?

cumulative compound motors

shunt motors

series motors

both B and C

cumulative compound motors

shunt motors

series motors

both B and C

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

one fourth.

4 times.

half.

double.

one fourth.

4 times.

half.

double.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

boo.

hum.

zoom.

magnetostriction.

boo.

hum.

zoom.

magnetostriction.

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

112.5 W

168.75 W

50 W

75 W

112.5 W

168.75 W

50 W

75 W

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Electrical Machines
Flashing of DC generator means

increasing flux density by providing extra ampere-turns in field.

None of these

neutralization of residual magnetism.

creation of residual magnetism by a DC source.

increasing flux density by providing extra ampere-turns in field.

None of these

neutralization of residual magnetism.

creation of residual magnetism by a DC source.

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Electrical Machines

Electrical Machines The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Electrical Machines Which motor cannot be started on no load?

Electrical Machines Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

Electrical Machines The noise resulting from vibrations of lamination set by magnetic forces, is termed as

Electrical Machines A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

Electrical Machines Flashing of DC generator means

Electrical Machines
The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be

Electrical Machines
Which motor cannot be started on no load?

Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

Electrical Machines
Flashing of DC generator means