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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is
0.08
-1.92
1.92
-0.08
0.08
-1.92
1.92
-0.08
Answer
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Related Question
Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron
reduces the saturation magnetization.
increases the hysteresis loss.
increases the electrical resistivity of iron.
None of these
reduces the saturation magnetization.
increases the hysteresis loss.
increases the electrical resistivity of iron.
None of these
Answer
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Electrical Machines
Direct axis reactance is defined as the ratio of
Vmin to Imin
Vmin to Imax
Vmax to Imin
Vmax to Imax
Vmin to Imin
Vmin to Imax
Vmax to Imin
Vmax to Imax
Answer
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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,
3.
7.
4.
12.
3.
7.
4.
12.
Answer
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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as
0.3 mg of KOH / gm.
2 mg of KOH / gm.
1 mg of KOH / gm.
0.5 mg of KOH / gm.
0.3 mg of KOH / gm.
2 mg of KOH / gm.
1 mg of KOH / gm.
0.5 mg of KOH / gm.
Answer
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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.
0.443.
0.512.
0.573.
0.649.
0.443.
0.512.
0.573.
0.649.
Answer
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