Hi friends, this post is about transformer objectives. These are some of the questions asked in previous question papers of Gate, IES and other competitive exams. check out and comment if you have any doubts.....
1) The desirable properties of transformer core material are
A) low permeability and low hysteresis loss
B) high permeability and high hysteresis loss
C) high permeability and low hysteresis loss
D) low permeability and high hysteresis loss
Ans:C
2) When are eddy current losses in a transformer reduced?
A) If laminations are thick
B) If the number of turns in primary winding is reduced
C) If the number of turns in secondary winding is reduced
D) If laminations are thin
Ans:D
3) Minor insulation in a transformer is the insulation between the
A) lv winding and core
B) lv and hv winding
C) turns of the windings
D) layers of the windngs
E) both (C) and (D)
Ans:E
4) Major insulation in a transformer is the insulation between the
A) lv winding and core
B) lv and hv winding
C) turns of the windings
D) both (A) and (B)
Ans:D
5) In a transformer, an insulating material may fail due to
A) moisture
B) dust
C) voids in the winding
D) any one or more of the above
Ans:D
6) Conservator (for transformer) is used
A) to take up the expansion of oil due to temperature rise
B) to act as an oil storage
C) for better cooling of transformer
D) None of the above
Ans:A
7) The colour of fresh dielectric oil used in transformer is
A) dark brown
B) pale yellow
C) pale pink
D) white grey
Ans:B
8) Transformer oil must be free from
A) moisture
B) sludge's
C) gases
D) sulphur
Ans:A
9) The primary and secondary winding are interlaced for
A) easiness of coil making
B) reduced leakage reactance
C) reduced cost
D) uniform heating
Ans:B
10) In transformers, the primary and secondary are interlaced so that
A) there may be maximum flux linkage between the two winding
B) copper is saved
C) both (A) and (B)
D) statement is false
Ans:A
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