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Microwave Linear Beam Tubes – 1 – 2

6. The main advantage of a TWT over a klystron for microwave amplification is :

(a) lower cost
(b) smaller size
(c) higher power
(d) 
wider bandwidth

ANSWER

EXPLANATION

7. In a TWT, the electron beam is density-modulated by a :

(a) permanent magnet
(b) modulation transformer
(c) helix
(d) 
cavity resonator

ANSWER

EXPLANATION

8. High-power TWTs are replacing what in microwave amplifiers ?

(a) MESFETs
(b) magnetrons
(c) klystrons
(d) 
IMPATT diodes

ANSWER

EXPLANATION

9. Attenuator is used in the traveling wave tube to :

(a) prevent oscillation
(b) increase gain
(c) prevent saturation
(d) 
all of these

ANSWER

EXPLANATION

10. At what position is the input signal inserted into a traveling-wave tube ?

(a) at the cathode end of the helix
(b) at the collector
(c) at the collector end of the helix
(d) 
at the control grid of the electron gun

ANSWER

EXPLANATION

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