Transformers Solved Objective Questions: Part-6

Transformers Objective Questions

[1] A transformer core is laminated to
A. Reduce hysteresis loss
B. Reduce eddy current losses
C. Reduce copper losses
D. Reduce all above losses

Ans: B

[2] While conducting short-circuit test on a transformer the following side is short-circuited
A. High voltage side
B. Low voltage side
C. Primary side
D. Secondary side

Ans:B

[3] Distribution transformers are generally designed for maximum efficiency around
A. 90% load
B. Zero load
C. 25% load
D. 50% load

Ans: D

[4] A transformer oil must be free from
A. Sludge
B. Odour
C. Gases
D. Moisture

Ans:D

[5] The use of higher flux density in the transformer design
A. Reduces weight per KVA
B. Reduces iron losses
C. Reduces copper losses
D. Increases part load efficiency

Ans:A

[6] In a transformer the toppings are generally provided on
A. Primary side
B. Secondary side
C. Low voltage side
D. High voltage side

Ans: C

[7] Which of the following is not a part of transformer installation?
A. Conservator
B. Breather
C. Buchholz relay
D. Exciter

Ans:D

[8] The path of a magnetic flux in a transformer should have
A. High resistance
B. High reluctance
C. Low resistance
D. Low reluctance

Ans:D

[9] In case there are burrs on the edges of the laminations of the transformer, it is likely to result in
A. Vibrations
B. Noise
C. Higher eddy currents loss
D. Higher hysteresis loss

Ans: C

[10] Silicon steel used in laminations mainly reduces
a. Hysteresis loss
b. Eddy current losses
c. Copper loss
d. All of the above

Ans: A