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Electrical Machines
Wave winding is employed in DC machine of
high current and low voltage rating.
low current and high voltage rating.
high current and low voltage rating.
low current and low voltage rating.
high current and low voltage rating.
low current and high voltage rating.
high current and low voltage rating.
low current and low voltage rating.
Answer
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Related Question
Electrical Machines
Which of the following methods of speed control is not affected through stator side?
Change of supply frequency.
Change of supply voltage.
Change of rotor resistance.
Change of number of pole.
Change of supply frequency.
Change of supply voltage.
Change of rotor resistance.
Change of number of pole.
Answer
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Electrical Machines
In an auto-transformer, power is transferred through
None of these
conduction process only.
induction process only.
both A and B.
None of these
conduction process only.
induction process only.
both A and B.
Answer
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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be
3.2% and -1.6%
None of these
6% and -4%
4.8% and -3.2%
3.2% and -1.6%
None of these
6% and -4%
4.8% and -3.2%
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.
0.5 mg of KOH / gm.
2 mg of KOH / gm.
1 mg of KOH / gm.
0.3 mg of KOH / gm.
0.5 mg of KOH / gm.
2 mg of KOH / gm.
1 mg of KOH / gm.
Answer
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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is
armature winding
interpole and compensating windings together
field winding
interpole winding
armature winding
interpole and compensating windings together
field winding
interpole winding
Answer
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