COMMUNICATION SYSTEMS QUIZ

DVD uses

Laser beam for both recording and playback

None of these

Laser beam for recording and video head for playback

Video head for recording and laser beam for playback

TRUE ANSWER : ?
YOUR ANSWER : ?

Under ordinary circumstances, impulse noise can be reduced in

AM only

Both AM and FM

None of these

FM only

TRUE ANSWER : ?
YOUR ANSWER : ?

The direction of rotation of a CD is

Clockwise or anticlockwise depending on frequency of data stored

Anticlockwise

Mostly anticlockwise but some times clockwise

Clockwise

TRUE ANSWER : ?
YOUR ANSWER : ?

Skip distance depends on time of day and angle of incidence.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

0.5

1

0.8

TRUE ANSWER : ?
YOUR ANSWER : ?

Full duplex operation permits transmission in both directions at the same time.

False

True

TRUE ANSWER : ?
YOUR ANSWER : ?

SSB can be generated by

Good attenuation characteristics

All of these

Filter method

Phase cancellation method

TRUE ANSWER : ?
YOUR ANSWER : ?

A zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be

Orthogonal

Uncorrelated

Correlated

Statistically independent

TRUE ANSWER : ?
YOUR ANSWER : ?

The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?

Gets halved

Gets increased by 50 percent

Gets doubled

Remains unchanged

TRUE ANSWER : ?
YOUR ANSWER : ?

The characteristic impedance of a twin wire feeder used for TV signals is about

300 ohm

500 ohm

1000 ohm

100 ohm

TRUE ANSWER : ?
YOUR ANSWER : ?