MICROWAVE COMMUNICATION QUIZ

Which of the following permits a microwave signal to travel in one direction with virtually no loss, but severely attenuates any signal attempting to travel in the reverse direction?

Tunnel diode

Circulator

Wave trap

Isolator

TRUE ANSWER : ?
YOUR ANSWER : ?

A high-power microwave pulse of the order of megawatts can be generated by a

Gunn diode

Reflex klystron

Magnetron

Traveling-wave tube

TRUE ANSWER : ?
YOUR ANSWER : ?

Calculate the effective earth’s radius if the surface refractivity is 301.

6370 mi

8493 mmi

6370 km

8493 km

TRUE ANSWER : ?
YOUR ANSWER : ?

Rainfall is an important factor for fading of radio waves at frequencies above

1 GHz

100 GHz

10 GHz

100 MHz

TRUE ANSWER : ?
YOUR ANSWER : ?

A PPI cathode-ray tube as used on a radar set

Indicates both the range and azimuth of a target

Is used for receiver alignment

Is used to check the percentage of modulation

Indicates only the range of a target

TRUE ANSWER : ?
YOUR ANSWER : ?

In an SHF pulsed radar set, a reflex klystron can be used as a

Local oscillator

Single mixer stage

Duplexer stage

Transmitter oscillator

TRUE ANSWER : ?
YOUR ANSWER : ?

The aquadag coating on the inside of PPI tube is used

To focus the beam of primary electrons

All of these

As a second anode and to prevent the build-up of secondary field

To shield the electron beam from unidirectional magnetic

TRUE ANSWER : ?
YOUR ANSWER : ?

The Gunn diode oscillator

Is capable of generating continuous microwave power of the order of kilowatt

Operates over a positive resistance characteristic

Depends on the formation of charge domain

Generates frequencies which are below 100 MHz

TRUE ANSWER : ?
YOUR ANSWER : ?

A thin layer of dirt and grime coverts the reflecting surface of the parabolic dish of a radar set. The particular effect on the performance of the radar will be

A decrease in range

A decrease in gain

No noticeable effect

A reduction in horizontal resolution

TRUE ANSWER : ?
YOUR ANSWER : ?

A magnetron is operated at a duty cycle of 0.001. It has a peak power output of 100 kilo-watts. Its average power is

1,000,000 watts

1,000 watts

100 watts

10,000 watts

TRUE ANSWER : ?
YOUR ANSWER : ?