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Transformers
A common method of cooling a power transformer is
natural air cooling
air blast cooling
Any of these
oil cooling
natural air cooling
air blast cooling
Any of these
oil cooling
Answer
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Related Question
Transformers
To step 110 V ac down to 20 V ac, the turns ratio must be
5.5
0.18
18
0.018
5.5
0.18
18
0.018
Answer
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Transformers
In an auto transformer, the primary and secondary are _____ coupled.
None of the listed here
Magnetically as well as electrically
Only electrically
Only magnetically
None of the listed here
Magnetically as well as electrically
Only electrically
Only magnetically
Answer
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Transformers
The open circuit test on a transformer is always made on ______
High voltage winding
None of the listed here
Either low or high voltage winding
Low voltage winding
High voltage winding
None of the listed here
Either low or high voltage winding
Low voltage winding
Answer
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Transformers
The all day efficiency of a transformer is ______ the commercial efficiency.
Less than
The same as
None of the listed here
More than
Less than
The same as
None of the listed here
More than
Answer
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Transformers
An ideal transformer is one which _______
Has same number of primary and secondary turns
Has no losses and leakage reactance
None of the listed here
Does not work
Has same number of primary and secondary turns
Has no losses and leakage reactance
None of the listed here
Does not work
Answer
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