Microwave Devices and Circuits MCQs

Question 1

Which of the following is not an application of microwave cavities?

Accepted Answer

Detector

Answer

Band pass filter

Answer

Band stop filter

Answer

Oscillator frequency control

Question 2

In a magnetron the electrons travel in a cycloidal path because

Accepted Answer

permanent magnets supply a strong field

Answer

the anode is negative

Answer

the cathode is positive

Answer

the cavities are resonant

Question 3

The biggest disadvantage of the IMPATT diode is its

Accepted Answer

high noise

Answer

low efficiency than the other microwave diodes

Answer

low power handling ability

Answer

inability to provide pulsed operation

Question 4

One of the following which diode is not used as a microwave mixer or detector?

Accepted Answer

PIN diode

Answer

Crystal diode

Answer

Schottky barrier diode

Answer

Backward diode

Question 5

One of the following microwave diodes is suitable for very low-power oscillator only

Accepted Answer

Tunnel

Answer

Gunn

Answer

IMPA'TT

Answer

LSA

Question 6

Noise figure is used as figure of merit of

Accepted Answer

Amplifier

Answer

Oscillator

Answer

Moderator

Answer

Isolator

Question 7

Strapping is used in cavity magnetron to

Accepted Answer

prevent mode jumping

Answer

ensure bunching

Answer

prevent cathode-back heating

Answer

improve the phase focusing effect

Question 8

The angle between electric and magnetic fields in a waveguide is

Accepted Answer

90?

Answer

0

Answer

180?

Answer

3600

Question 9

The average thermal noise is

Accepted Answer

constant as long as the bandwidth is fixed

Answer

dependent on channel loading

Answer

due to amplitude non-linearity in system

Answer

not related to the microwave comunication at all