11. A traveling wave tube consists of :
(a) electron gun, helix and repeller
(b) electron gun, helix and collector
(c) electron gun, repeller and collector
(d) buncher cavity and catcher cavity
12. Which of the following is considered as the major advantage of using a helix traveling wave tube ?
(a) cheaper
(b) less noise
(c) high power
(d) wide bandwidth
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