COMMUNICATION SYSTEMS QUIZ

The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

50 kW

8 kW

0.5 kW

20 kW

TRUE ANSWER : ?
YOUR ANSWER : ?

Which one of the following is analog?

Delta modulation

PWM

Differential PCM

PCM

TRUE ANSWER : ?
YOUR ANSWER : ?

SSB can be generated by

All of these

Phase cancellation method

Good attenuation characteristics

Filter method

TRUE ANSWER : ?
YOUR ANSWER : ?

To eliminate ghosts in the picture

Change the antenna orientation of location

Connect a booster

Twist the transmission line

Use a longer transmission line

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

Amplitude of distant sidebands first increases, then decreases

Amplitude of distant sidebands increases

Amplitude of distant sidebands remains constant

Amplitude of distant sidebands decreases

TRUE ANSWER : ?
YOUR ANSWER : ?

PAM stands for

Phase Amplitude Modulation

Pulse Analogue Modulation

Phase Analogue Modulation

Pulse Amplitude Modulation

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the purpose of peak clipper circuits in radio transmitters?

To increase bandwidth

To regulate oscillator I/P voltage

To prevent overmodulation

To reduce bandwidth

TRUE ANSWER : ?
YOUR ANSWER : ?

A modem is classified as low speed if data rate handled is

Upto 600 bps

Upto 400 bps

Upto 100 bps

Upto 250 bps

TRUE ANSWER : ?
YOUR ANSWER : ?

A telephone channel requires a bandwidth of about

3 kHz

10 kHz

50 kHz

1 kHz

TRUE ANSWER : ?
YOUR ANSWER : ?

DVD uses

Video head for recording and laser beam for playback

Laser beam for both recording and playback

None of these

Laser beam for recording and video head for playback

TRUE ANSWER : ?
YOUR ANSWER : ?