Transformers

href="https://exam.pscnotes.com/mcq/the-highest-voltage-for-transmitting-electrical-power-in-india-is/#more-52475">Detailed SolutionThe 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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actual transformer the iron loss
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remains practically constant from noload to fullload because" class="read-more button" href="https://exam.pscnotes.com/mcq/in-an-actual-transformer-the-iron-loss-remains-practically-constant-from-noload-to-fullload-because/#more-52432">Detailed SolutionIn an actual transformer the iron loss remains practically constant from noload to fullload because

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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11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube of the same 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 SolutionThe efficiencies of transformers compared with that of electric motors of the same power are

58. The hum in a transformer is mainly attributed to

load changes
oil in the transformer
magnetostriction
mechanical vibrations

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button" href="https://exam.pscnotes.com/mcq/the-hum-in-a-transformer-is-mainly-attributed-to/#more-52224">Detailed SolutionThe hum in a transformer is mainly attributed to

59. The thickness of laminations used in a transformer is usually

0.4 mm to 0.5 mm
4 mm to 5 mm
14 mm to 15 mm

Detailed SolutionThe thickness of laminations used in a transformer is usually

60. Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V

Its secondary current is 5 A
Its secondary voltage is 400 V

Detailed SolutionWhich of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V

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