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Electrical Engineering Objective Questions { Transformers }



218.  The place of transformer installation is selected such that
A. location is not too warm
B. plentry of dry and clean air is available and wet conditions are not encountered
C. location is not subject to damage from men and material traffic
D. all above requirements are met with
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219.  A transformer designed for installation in a tropical country if installed in a cold country
A. is to be loaded below the name plate kVA rating
B. can be loaded in excess of the name plate kVA rating
C. either of the above
D. neither of the above
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220.  Most widely used insulating and cooling transformer liquid is
A. mineral oil
B. water
C. askarel
D. none of the above
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221. A current transformer is
A. a magnetic component to change voltage level
B. an instrument to transform A.C. current to D.C. current
C. a magnetic component to change current level
D. none of the above
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222.  Buchholz's relay is used in
A. motor protection
B. line protection
C. generator protection
D. transformer protection
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223. Buchholz's relay gives warning and protection against
A. electrical fault inside the transformer itself
B. electrical fault outside the transformer in outgoing feeder
C. either of the above
D. none of the above
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224. For power purpose sine wave shape is preferred because
A. it gives least copper losses
B. it is easy to generate e.m.f. of this wave shape
C. it is stable wave shape as the line parameters cannot change it
D. none of the above
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