﻿ The range of frequencies allotted for FM radio is | Communication Systems

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# Communication Systems

#### Multiple Choice Questions

41.

A signal wave of frequency 12 kHZ is modulated with a carrier wave of frequency 2.51 MHz. The upper and lower side band frequencies are respectively

• 2512 kHz and 2508 kHz

• 2522 kHz and 2488 kHz

• 2502 kHz and 2498 kHz

• 2522 kHz and 2498 kHz

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# 42.The range of frequencies allotted for FM radio is88 to 108 kHz 88 to 108 MHz 47 to 230 kHz 47 to 230 MHz

B.

88 to 108 MHz

There is a national frequency allocation plan for everything from man radio to radio astronomy. Radio frequencies in the 88 to 108 MHz range are set aside exclusively for FM broadcasting. No less than 34 channels can be accomodated in this range at a single location, allowing for a separation of 400 kHz between channels.

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43.

If a radio receiver amplifies all the signal frequencies equally well, it is said to have high

• fidelity

• distortion

• sensibility

• sensitivity

44.

A TV tower has a height of 100 m. What is the maximum distance up to which the TV transmission can be received (R = 8 × 106 m) ?

• 34.77 km

• 32.70 km

• 40 km

• 40.70 km

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45.

Amplitude modulation has

• one carrier with infinite frequencies

• one carrier with two side band frequencies

• one carrier with high frequency

• one carrier

46.

The waves used for Line-of-Sight (LOS) communication is

• sound waves

• ground waves

• sky waves

• space waves

47.

The process of superimposing message signal on high frequency carrier wave is called

• amplification

• demodulation

• transmission

• modulation

48.

A basic communication system consists of

1. Transmitter
2. Information sources
3. User of information
4. Channel
5. Receiver

• ii, i, iv, v and iii

• i, ii, iii, iv and v

• ii, v, i, iv and iii

• ii, iv, i, iii and v

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