COMMUNICATION SYSTEMS QUIZ

To eliminate ghosts in the picture

Change the antenna orientation of location

Twist the transmission line

Connect a booster

Use a longer transmission line

TRUE ANSWER : ?
YOUR ANSWER : ?

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

0.5

0.8

1

TRUE ANSWER : ?
YOUR ANSWER : ?

The main function of a balanced modulator is to

Produce balanced modulation of a carrier wave

Suppress carrier signal in order to create a single-sideband or double sideband

Produce 100% modulation

Limit noise picked by a receiver

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is an indirect way of generating FM?

Reactance FET modulator

Reactance bipolar transistor

Armstrong modulator

Varactor diode modulator

TRUE ANSWER : ?
YOUR ANSWER : ?

Under ordinary circumstances, impulse noise can be reduced in

AM only

Both AM and FM

FM only

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

A telephone channel requires a bandwidth of about

50 kHz

10 kHz

1 kHz

3 kHz

TRUE ANSWER : ?
YOUR ANSWER : ?

Commercial Frequency deviation of FM is

80 kHz

65 kHz

70 kHz

75 kHz

TRUE ANSWER : ?
YOUR ANSWER : ?

In a FM receiver, amplitude limiter

None of these

Amplifiers low frequency signals

Eliminates any change in amplitude of received FM signals

Reduces the amplitude of signals

TRUE ANSWER : ?
YOUR ANSWER : ?

PAM stands for

Pulse Amplitude Modulation

Pulse Analogue Modulation

Phase Analogue Modulation

Phase Amplitude Modulation

TRUE ANSWER : ?
YOUR ANSWER : ?

In a TV receiver antenna the length of reflector rod

May be equal, more or less than that of dipole

Is less than that of dipole

Is the same as that of dipole

Is more than that of dipole

TRUE ANSWER : ?
YOUR ANSWER : ?

↑