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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :
1 and 3
2 and 3
1 and 2
1, 2 and 3
1 and 3
2 and 3
1 and 2
1, 2 and 3
Answer
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Related Question
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 Ω.
14.28 and 9.60 Ω.
8.248 and 9.60 Ω.
8.248 and 5.54 Ω.
14.28 and 5.54 Ω.
14.28 and 9.60 Ω.
8.248 and 9.60 Ω.
8.248 and 5.54 Ω.
Answer
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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip
None of these
3.33 %.
3 %.
0 .001 %.
None of these
3.33 %.
3 %.
0 .001 %.
Answer
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Electrical Machines
The flux involved in the emf equation of a transformer has
average value.
total value.
rms value.
maximum value.
average value.
total value.
rms value.
maximum value.
Answer
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Electrical Machines
Cogging and crawling are phenomena associated with
any of the above.
cage induction machines and they are essentially the same.
the former at a fraction of its rate speed and the latter during starting.
the former during starting and the latter at a fraction of its rated speed.
any of the above.
cage induction machines and they are essentially the same.
the former at a fraction of its rate speed and the latter during starting.
the former during starting and the latter at a fraction of its rated speed.
Answer
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Electrical Machines
Secondary winding of an auto transformer is also called
compensating winding.
damping winding.
tertiary winding.
common winding.
compensating winding.
damping winding.
tertiary winding.
common winding.
Answer
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