Microwave Devices and Circuits MCQs

Question 1

The biggest disadvantage of the IMPATT diode is its

Accepted Answer

high noise

Answer

lower efficiency than for the other microwave diodes

Answer

low power-handling ability

Answer

inability to provide pulsed operation

Question 2

A PIN diode is

Accepted Answer

suitable for use as a microwave switch

Answer

a metal semiconductor point-contact diode

Answer

a microwave mixer diode

Answer

often used as a microwave detector

Question 3

The normal fade margin in a line-of-sight microwave system is ___ dB.

Accepted Answer

25

Answer

10

Answer

40

Answer

60

Question 4

A transmission line has a VSWR of 2, the reflection coefficient is

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 5

Sync separator in a TV receiver

Accepted Answer

sparates sync pulses (horizontal and vertical) from the composite video signal

Answer

separates horisontal and vertical synch pulses

Answer

separates only horixontal sync pulses

Answer

separates only vertical sync pulses

Question 6

The baseband bandwidth of television transmission is ____ MHz.

Accepted Answer

5

Answer

1

Answer

30

Answer

10

Question 7

Perodic permanent-manget focussing is used with TVVT's to

Accepted Answer

avoid the bulk of an electromagnet

Answer

allow pulsed operation

Answer

allow coupled-cavity operation at the highest frequencies

Answer

improve electron bunching

Question 8

The reflex klystron is often preferred to the two-cavity ldystron oscillator because the former

Accepted Answer

is easier to tune

Answer

is more efficient

Answer

has higher number of modes

Answer

producess a higher output power

Question 9

Which of the following antenna is best excited from a waveguide?

Accepted Answer

helical

Answer

biconical

Answer

horn

Answer

discone