6. Which of the following microwave tube amplifier uses an axial magnetic field and radial electric field ?
(a) Coaxial magnetron
(b) CFA
(c) Travelling wave magnetron
(d) Reflex klystron
7. The frequency determining portion of a magnetron is :
(a) A resonant cavity
(b) A shorted line
(c) An open line
(d) A cathode
8. The gain of a TWT is proportional to :
(a) Length of tube
(b) Type of input and output coupling
(c) None of the above
(d) Both a and b
9. Which of the following is unlikely to be used as a pulsed device ?
(a) TWT
(b) CFA
(c) BWO
(d) Multi-cavity klystron
10. TWT is preferred to multicavity klystron amplifier because it is :
(a) More efficient
(b) Greater B.W.
(c) Has higher number of modes
(d) Produces a higher output power
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