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Transformers
The no load ratio of a 50 Hz single phase transformer is 6000/250 V. The maximum flux in the core is 0.06 Wb. What is the number of primary turns?
210
900
450
350
210
900
450
350
Answer
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Transformers
The efficiencies of transformers compared with that of electric motors of the same power are
much smaller
much higher
somewhat smaller
about the same
much smaller
much higher
somewhat smaller
about the same
Answer
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A transformer oil must be free from
Odour
Sludge
Moisture
Gases
Odour
Sludge
Moisture
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The turns ratio required to match an 80 source to a 320 load is
2
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4
20
2
80
4
20
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Transformers
When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is
0 V
0.75 V
6 V
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0 V
0.75 V
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Answer
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Transformers
The flux in the core of a single phase transformer is _____
Purely rotating one
Purely alternating one
None of the listed here
Partly alternating and partly rotating
Purely rotating one
Purely alternating one
None of the listed here
Partly alternating and partly rotating
Answer
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