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) In a transformer, electrical power is transferred from primary to secondary
A) through air
B) by magnetic flux
C) through insulating medium
D) none of these
Ans:B
2) The flux created by the current flowing through the primary winding induces emf in
A) primary winding
B) secondary winding
C) transformer core only
D) both primary and secondary winding
Ans:D
3) If rated dc voltage is applied instead of ac to the primary of a transformer
A) secondary of transformer will burn
B) primary of transformer will burn
C) secondary voltage will be excessively high
D) there will be no secondary voltage
Ans:B
4) In an ordinary transformer which of the following does not change
A) voltage
B) current
C) frequency
D) all of the above
Ans:C
5) The efficiency of a power transformer is around
A) 50%
B) 60%
C) 80%
D) 95%
Ans:D
6) The basic function of a transformer is to change
A) the level of the voltage
B) the power level
C) the power factor
D) the frequency
Ans:A
7) An ideal transformer does not change
A) voltage
B) power
C) current
D) none of these
Ans:B
8) The two winding of a transformer are
A) conductively linked
B) inductively linked
C) not linked at all
D) electrically linked
Ans:B
9) Transformer action requires a
A) constant magnetic flux
B) increasing magnetic flux
C) alternating magnetic flux
D) alternating electric flux
Ans:C
10) The iron core in a transformer provides a ................ path to the main flux
A) low reluctance
B) high reluctance
C) low resistance
D) high conductivity
Ans:A
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