Transformers Archives

91. Spacers are provided between adjacent coils

to provide free passage to the cooling oil

to insulate the coils from each other

both (A) and (B)

none of the above

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adjacent coils" class="read-more button" href="https://exam.pscnotes.com/mcq/spacers-are-provided-between-adjacent-coils/#more-47489">Detailed Solution

92. During short circuit test iron losses are negligible because

the current on secondary side is negligible

the voltage on secondary side does not vary

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Detailed SolutionDuring short circuit test iron losses are negligible because

93. Which of the following insulating materials can withstand the highest temperature safely?

Cellulose

Asbestos

Mica

Glass fibre

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Detailed

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Solution

94. If the supply frequency to the transformer is increased, the iron loss will

not change

decrease

increase

any of the above

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button" href="https://exam.pscnotes.com/mcq/if-the-supply-frequency-to-the-transformer-is-increased-the-iron-loss-will/#more-47180">Detailed Solution

95. In a power or distribution transformer about 10 per cent end turns are heavily insulated

to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns

to absorb the line surge voltage and save the winding of transformer from damage

to reflect the line surge and save the winding of a transformer from damage

none of the above

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Detailed SolutionIn a power or distribution transformer about 10 per cent end turns are heavily insulated

96. Iron loss of a transformer can be measured by

low power factor wattmeter

unity power factor wattmeter

frequency meter

any type of wattmeter

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class="read-more button" href="https://exam.pscnotes.com/mcq/iron-loss-of-a-transformer-can-be-measured-by/#more-47085">Detailed Solution

97. Negative voltage regulation is indicative that the load is

capacitive only

inductive only

inductive or resistive

none of the above

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98. Losses which occur in rotating electric machines and do not occur in trans formers are

friction and windage losses

magnetic losses

hysteresis and eddy current losses

copper losses

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Detailed SolutionLosses

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which occur in rotating electric machines and do not occur in trans formers are