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Transformers
The approximate efficiency of a large transformer is
50%
80%
65%
95%
50%
80%
65%
95%
Answer
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Related Question
Transformers
A transformer operates poorly at very low frequencies because _____
None of the listed here
Primary reactance is too much increased
Magnetising current is abnormally high
Permeability of core is increased
None of the listed here
Primary reactance is too much increased
Magnetising current is abnormally high
Permeability of core is increased
Answer
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Transformers
Natural oil cooling is used for transformers up to a rating of
1000 kVA
3000 kVA
500 kVA
250 kVA
1000 kVA
3000 kVA
500 kVA
250 kVA
Answer
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Transformers
The winding of the transformer with greater number of turns will be _____
Low voltage winding
Either high or low voltage winding
None of the listed here
High voltage winding
Low voltage winding
Either high or low voltage winding
None of the listed here
High voltage winding
Answer
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Transformers
In a power or distribution transformer about 10 per cent end turns are heavily insulated
to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
to reflect the line surge and save the winding of a transformer from damage
None of these
to absorb the line surge voltage and save the winding of transformer from damage
to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
to reflect the line surge and save the winding of a transformer from damage
None of these
to absorb the line surge voltage and save the winding of transformer from damage
Answer
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Transformers
In which of the following transformer part of primary winding also serves as the secondary winding?
Current transformer
Step-up transformer
Potential transformer
Auto transformer
Current transformer
Step-up transformer
Potential transformer
Auto transformer
Answer
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