Electrical Engineering MCQs

Page No. 328

A transformer oil must be free from________________?


asludge


bodour


cgases


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



The function of conservator in a transformer is___________________?


a to project against’internal fault


bto reduce copper as well as core losses


c to cool the transformer oil


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


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


b boo


chum


dzoom


View Answer hum

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