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Transformers
Which of the following is the main advantage of an auto-transformer over a two winding transformer?
Saving in winding material
Eddy losses are totally eliminated
Copper losses are negligible
Hysteresis losses are reduced
Saving in winding material
Eddy losses are totally eliminated
Copper losses are negligible
Hysteresis losses are reduced
Answer
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Related Question
Transformers
Sumpner's test is conducted on transformer to determine
Temperature
All day efficiency
Stray losses
None of the listed here
Temperature
All day efficiency
Stray losses
None of the listed here
Answer
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Transformers
A shell-type transformer has
reduced magnetic leakage
high eddy current losses
None of these
negligibly hysteresis losses
reduced magnetic leakage
high eddy current losses
None of these
negligibly hysteresis losses
Answer
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Transformers
Harmonics in transformer result in
magnetic interference with communication circuits
All of the listed here
increased I2R losses
increased core losses
magnetic interference with communication circuits
All of the listed here
increased I2R losses
increased core losses
Answer
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Transformers
The no load primary current is about ______of full load primary current.
Above 40%
3-5%
30-40%
15-30%
Above 40%
3-5%
30-40%
15-30%
Answer
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Transformers
In a transformer the resistance between its primary and secondary is
1 ohm
Zero
Infinite
1000 ohms
1 ohm
Zero
Infinite
1000 ohms
Answer
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