Transformers Archives

51. No-load current in a transformer

lags behind the voltage by about 75Â°

leads the voltage by about 75Â°

lags behind the voltage by about 15Â°

leads the voltage by about 15Â°

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52. The efficiency of two identical transformers under load conditions can be determined by

short-circuit test

back-to-back test

open circuit test

any of the above

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53. Greater the secondary leakage flux

less will be the secondary induced e.m.f.

less will be the primary induced e.m.f.

none of the above

Detailed SolutionGreater the secondary leakage flux

54. A transformer oil must be free from

sludge

odour

gases

moisture

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55. The highest voltage for transmitting electrical power in India is

33 kV

66 kV

132 kV

400 kV E. 765 kV

Detailed Solution

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class="screen-reader-text">The highest voltage for transmitting electrical power in India is

56. In an actual transformer the iron loss remains practically constant from noload to fullload because

value of transformation ratio remains constant

permeability of transformer core remains constant

core flux remains practically constant

primary voltage remains constant

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57. The efficiencies of transformers compared with that of electric motors of the same power are

about the same

much smaller

much higher

somewhat smaller

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power are" class="read-more button" href="https://exam.pscnotes.com/mcq/the-efficiencies-of-transformers-compared-with-that-of-electric-motors-of-the-same-power-are/#more-52326">Detailed Solution