11. Multi-layer helical windings are commonly used in the transformers as high voltage windings_______________?
A. upto 20 kV
B. upto 50 kV
C. upto 80 kV
D. for 110 kV and above
✅ The correct answer is option D.
Electrical Machine Design MCQs
12. _______________is universally used for windings of electrical machines because it is easily workable without any possibility of fracture?
A. Silver
B. Steel
C. Aluminium
D. Copper
✅ The correct answer is option D.
13. Hot rolled sheets have ___________ value of permeability?
A. zero
B. low
C. high
D. none of the above
✅ The correct answer is option B.
14. The cold rolled grain oriented steel has _________ permeability in the direction of the grain orientation?
A. minimum
B. maximum
C. nil
D. none of the above
✅ The correct answer is option B.
15. Aluminium when adopted as a conductor material in __________ transformers, decreases the overall cost of the transformer?
A. small size
B. medium size
C. large size
D. any of the above size
✅ The correct answer is option A.