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Electrical Engineering Objective Questions { Transformers }

190. Which of the following insulating materials can withstand the highest temperature safely?
A. Cellulose
B. Asbestos
C. Mica
D. Glass fibre
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191. Which of the following parts of a transformer is visible from outside?
A. Bushing
B. Core
C. Primary winding
D. Secondary winding
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192. The noise produced by a transformer is termed as
A. zoom
B. hum
C. ringing
D. buzz
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193.  Which of the following loss in a transformer is zero even at full load?
A. Core loss
B. Frictionloss
C. Eddy current loss
D. Hysteresis loss
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194.  Which of the following is the most likely source of harmonics in a transformer?
A. Poor insulation
B. Overload
C. Loose connections
D. Core saturation
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195.  If a transformer is continuously operated the maximum temperature rise will occur in
A. core
B. windings
C. tank
D. any of the above
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196.  The hum in a transformer is mainly attributed to
A. load changes
B. oil in the transformer
C. magnetostriction
D. mechanical vibrations
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