MICROWAVE COMMUNICATION QUIZ

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

Gunn diode

Reflex klystron

Traveling-wave tube

Magnetron

TRUE ANSWER : ?
YOUR ANSWER : ?

A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B)

May be tested during the first five minutes of any hour

Must be capable of floating or being secured to a survival

All of these

Must have its battery replaced after emergency use

TRUE ANSWER : ?
YOUR ANSWER : ?

A shipboard equipment which measures the distance between the ship’s bottom and the ocean floor.

SONAR

Echosounder

Fathometer

LORAN

TRUE ANSWER : ?
YOUR ANSWER : ?

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?

Circulator

Isolator

Wave trap

Tunnel diode

TRUE ANSWER : ?
YOUR ANSWER : ?

The aquadag coating on the inside of PPI tube is used

To shield the electron beam from unidirectional magnetic

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

All of these

To focus the beam of primary electrons

TRUE ANSWER : ?
YOUR ANSWER : ?

The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the

Inter-electrode capacitance

Electron transit time

Distributed lead inductance

Degree of emission from the cathode

TRUE ANSWER : ?
YOUR ANSWER : ?

Theoretically electromagnetic radiation field strength varies in inverse proportion to the square of the distance, but when atmospheric attenuation effects and the absorption of the terrain are taken into account the attenuation can be as high as the inverse ___________ power of the distance.

Fourth

Sixth

Fifth

Third

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 reduction in horizontal resolution

No noticeable effect

A decrease in gain

A decrease in range

TRUE ANSWER : ?
YOUR ANSWER : ?

In a pulsed radar set, the STC circuit is used to

Improve the target bearing resolution

Increases receiver sensitivity for echoes from targets

Reduce interference from the effects of sea return

Vary the pulse frequency in order to control the maximum target

TRUE ANSWER : ?
YOUR ANSWER : ?

In a pulsed radar set, the function of the duplexer is to

Aid in calibrating the display unit

Allow the transmitter and the receiver to operate from a common antenna

All of these

Prevent frequency drift in the klystron

TRUE ANSWER : ?
YOUR ANSWER : ?