Microwave Devices and Circuits MCQs

Question 1

Waveguides are generally not made of

Accepted Answer

Copper

Answer

Bronze

Answer

Aluminium

Answer

Any of the above material

Question 2

Which of the following microwave tube is based on the principle of velocity modulation?

Accepted Answer

Klystron

Answer

TWT

Answer

Pencil triode

Answer

Magnetron

Question 3

Bolometers are used in measurement of

Accepted Answer

microwave power

Answer

RF power

Answer

audio power

Answer

none of the above

Question 4

A magnetron is virtually a

Accepted Answer

high power oscillator

Answer

high power amplifier

Answer

low power amplifier

Answer

low power oscillator

Question 5

The TWT is sometimes preferred to the magnetron as a radar transmitter output tube because it is

Accepted Answer

capable of a longer duty cycle

Answer

less noisy

Answer

more broad band

Answer

a more efficient cycle

Question 6

Reflex klystron are available at operating frequencies as high as

Accepted Answer

10,000 MHz

Answer

30,000 MHz

Answer

50,000 MHz

Answer

70,000 MI-Iz

Question 7

Faraday effect occurs mostly in

Accepted Answer

Trans-ionospheric propagation

Answer

HF frequency transmission

Answer

Simple radio transmission

Answer

None of the above

Question 8

Microwave link repeaters are typically 50 km apart

Accepted Answer

because of output tube power limitations

Answer

because of earth's curvature

Answer

because atmospheric attenuation

Answer

to ensure that the applied dc voltage is not excessive

Question 9

Waveguides are generally not used for frequencies

Accepted Answer

below 1 GHz

Answer

below 10 GHz

Answer

below 50 GHz

Answer

below 150 GHz