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Transformers
The efficiency of a transformer will be maximum when ______
Copper loss is equal to constant loss
Leakage reactance of the two winding
Resistance of the two winding are equal
None of the listed here
Copper loss is equal to constant loss
Leakage reactance of the two winding
Resistance of the two winding are equal
None of the listed here
Answer
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Related Question
Transformers
Short circuit test on transformers is conducted to determine
core losses
hysteresis losses
eddy current losses
copper losses
core losses
hysteresis losses
eddy current losses
copper losses
Answer
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Transformers
When secondary of a current transformer is open-circuited its iron core will be
cool as there is no secondary current
none of above will happen
hot because of heavy iron losses taking place in it due to high flux density
hot because primary will carry heavy current
cool as there is no secondary current
none of above will happen
hot because of heavy iron losses taking place in it due to high flux density
hot because primary will carry heavy current
Answer
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Transformers
In an auto transformer, the primary and secondary are _____ coupled.
None of the listed here
Only magnetically
Magnetically as well as electrically
Only electrically
None of the listed here
Only magnetically
Magnetically as well as electrically
Only electrically
Answer
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Transformers
The all day efficiency of a transformer is ______ the commercial efficiency.
None of the listed here
The same as
More than
Less than
None of the listed here
The same as
More than
Less than
Answer
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Transformers
A common method of colling a power transformer is
Air blast cooling
Oil cooling
Natural air cooling
Any of the listed here
Air blast cooling
Oil cooling
Natural air cooling
Any of the listed here
Answer
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