A. They are mechanically strong
B. They do not require any voltage for filament heating
C. Both (A) and (B)
D. None of the above
Correct Answer: Both (A) and (B) ✔
Last Updated: December 17, 2018
A. They are mechanically strong
B. They do not require any voltage for filament heating
C. Both (A) and (B)
D. None of the above
Correct Answer: Both (A) and (B) ✔
Last Updated: December 17, 2018