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Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,
polarities of all transformers must be same.
percentage impedance of all transformers must be same.
MVA rating of all transformer inversely proportional to impedance.
voltage ratio of all transformers must be same.
polarities of all transformers must be same.
percentage impedance of all transformers must be same.
MVA rating of all transformer inversely proportional to impedance.
voltage ratio of all transformers must be same.
Answer
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Related Question
Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.
kept constant to certain value.
remains unchanged.
decreased.
increased.
kept constant to certain value.
remains unchanged.
decreased.
increased.
Answer
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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in
10 HP.
13 HP.
15 HP.
14 HP.
10 HP.
13 HP.
15 HP.
14 HP.
Answer
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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be
increased by 20%
reduced by 10%
reduced by 20%
increased by 10%
increased by 20%
reduced by 10%
reduced by 20%
increased by 10%
Answer
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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is
series.
differential compound.
shunt.
cumulative compound.
series.
differential compound.
shunt.
cumulative compound.
Answer
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Electrical Machines
Which of the following transformer insulating oil generally used in India?
Aromatics based insulating oil.
Naphtha based insulating oil.
Olefin based insulating oil.
Paraffin based insulating oil.
Aromatics based insulating oil.
Naphtha based insulating oil.
Olefin based insulating oil.
Paraffin based insulating oil.
Answer
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