Electrical Engineering MCQs

Page No. 328

A transformer oil must be free from________________?


asludge

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bodour

✖


cgases

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d moisture

✓


View Answer moisture

The core used in high frequency transformer is usually___________?


acopper core

✖


bcost iron core

✖


c air core

✓


dmild steel core

✖


View Answer air core

In a transformer the resistance between its primary and secondary is____________?


azero

✖


b 1 ohm

✖


c 1000 ohms

✖


dinfinite

✓


View Answer infinite

Harmonics in transformer result in___________?


aincreased core losses

✖


bincreased I2R losses

✖


cmagnetic interference with communication circuits

✖


dall of the above

✓


View Answer all of the above

Helical coils can be used on___________?


a low voltage side of high kVA transformers

✓


bhigh frequency transformers

✖


chigh voltage side of small capacity transformers

✖


d high voltage side of high kVA rating transformers

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The function of conservator in a transformer is___________________?


a to project against’internal fault

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bto reduce copper as well as core losses

✖


c to cool the transformer oil

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dto take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings

✓



The thickness of laminations used in a transformer is usually____________?


a 0.4 mm to 0.5 mm

✓


b4 mm to 5 mm

✖


c14 mm to 15 mm

✖


d 25 mm to 40 mm

✖


View Answer 0.4 mm to 0.5 mm

Material used for construction of transformer core is usually___________________?


awood

✖


bcopper

✖


caluminium

✖


dsilicon steel

✓


View Answer silicon steel

Hysteresis loss in a transformer varies as CBmax = maximum flux density) ?


aBmax

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bBmax1-6

✓


cBmax1-83

✖


dB max

✖


View Answer Bmax1-6

The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?


amagnetostrication

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b boo

✖


chum

✓


dzoom

✖


View Answer hum

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