Microwave Devices and Circuits MCQs

Question 1

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

Accepted Answer

the buncher cavity

Answer

the velocity modulator

Answer

the catcher cavity

Answer

none of these

Question 2

Bunching process can be graphically explained by a curve or diagram

Accepted Answer

called velocity diagram called Applegate diagram

Answer

of electron density vs. distance from input gap

Answer

of input resonator electrical field vs.electron density

Answer

none of these

Question 3

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

Accepted Answer

20%

Answer

80%

Answer

90%

Answer

10%

Question 4

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

Accepted Answer

60%

Answer

30%

Answer

90%

Answer

none of these

Question 5

A reflex klystron is characterised by

Accepted Answer

only one cavity

Answer

a very high gain

Answer

a very high gain-brandwidth product

Answer

none of these

Question 6

A reflex klystron

Accepted Answer

is an oscillator

Answer

can be operated both as an amplifier and as an oscillator

Answer

only is a high gain single cavity microwave amplifier

Answer

none of these

Question 7

Pick the odd-man out

Accepted Answer

Reflex klystron

Answer

Travelling wave magnetron

Answer

Cyclotron-frequency magnetron

Answer

Negative resistance magnetron

Question 8

Typical value of efficiency (r0 for a multicavity magnetron may be as high as

Accepted Answer

70%

Answer

40%

Answer

30%

Answer

90%

Question 9

Following data apply to a travelling-wave tube with helix as slow- wave structure Beam voltage (accelerating) = 100 V Beam current= 100 ILA Characteristic impedance of helix =300.0 Power output of travelling-wave tube is

Accepted Answer

10 watts

Answer

50 watts

Answer

22 watts

Answer

none of these