Which type of winding is used in 3 phase shell-type transformer?
Which type of winding is used in 3 phase shell-type transformer?
A. Circular type
B. Sandwich type
C. Cylindrical type
D. Rectangular type
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Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?
Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?
A. Its secondary current is 5 A
B. Its secondary voltage is 400 V
C. Its rating is 2 kVA
D. Its secondary current is 20 A
E. It is a step-up transformerThe efficiency of a transformer, under heavy loads, is comparatively low because_______________?
The efficiency of a transformer, under heavy loads, is comparatively low because_______________?
A. copper loss becomes high in proportion to the output
B. iron loss is increased considerably
C. voltage drop both in primary and secondary becomes large
D. secondary output is much less as compared to primary inputN atural air coo ling is generally restricted for transformers up to__________?
N atural air coo ling is generally restricted for transformers up to__________?
A. 1.5 MVA
B. 5 MVA
C. 15 MVA
D. 50 MVAWhich of the following does not change in an ordinary transformer ?
Which of the following does not change in an ordinary transformer ?
A. Frequency
B. Voltage
C. Current
D. Any of the abovePower transformers are generally designed to have maximum efficiency around__________?
Power transformers are generally designed to have maximum efficiency around__________?
A. no-load
B. half-load
C. near full-load
D. 10% overloadThe noise produced by a transformer is termed as_______________________?
The noise produced by a transformer is termed as_______________________?
A. zoom
B. hum
C. ringing
D. buzz