Electronics Engineering Objective Questions { Microwave Devices and Circuits }

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183. In a two cavity klystron, the input cavity resonator is also known as

A. the velocity modulator

B. the catcher cavity

C. the buncher cavity

D. none of these

184. Bunching process can be graphically explained by a curve or diagram

A. of electron density vs. distance from input gap

B. called velocity diagram called Applegate diagram

C. of input resonator electrical field vs.electron density

D. none of these

185. Typical value of the overall efficiency of a two-cavity klystron is

186. Typical value of output circuit efficiency (i) of a two-cavity klystron is

D. none of these

187. A reflex klystron is characterised by

A. a very high gain

B. only one cavity

C. a very high gain-brandwidth product

D. none of these

188. A reflex klystron

A. can be operated both as an amplifier and as an oscillator

B. is an oscillator

C. only is a high gain single cavity microwave amplifier

D. none of these

189. Pick the odd-man out

A. Reflex klystron

B. Travelling wave magnetron

C. Cyclotron-frequency magnetron

D. Negative resistance magnetron

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