Transformers Archives

41. The power transformer is a constant

voltage device

current device

power device

main flux device

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42. The value of flux involved m the e.m.f. equation of a transformer is

average value

r.m.s. value

maximum value

instantaneous value

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43. Natural oil cooling is used for transformers up to a rating of

3000 kVA

1000 kVA

500 kVA

250 kVA

Detailed SolutionNatural oil

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cooling is used for transformers up to a rating of

44. In a transformer the resistance between its primary and secondary should be

Zero

1 ohm

1000 ohms

Infinity

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45. The efficiency of a transformer, under heavy loads, is comparatively low because

copper loss becomes high in proportion to the output

iron loss is increased considerably

voltage drop both in primary and secondary becomes large

secondary output is much less as compared to primary input

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heavy loads, is comparatively low because" class="read-more button" href="https://exam.pscnotes.com/mcq/the-efficiency-of-a-transformer-under-heavy-loads-is-comparatively-low-because/#more-53808">Detailed Solution