COMMUNICATION SYSTEMS QUIZ

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

0.5 kW

20 kW

50 kW

8 kW

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In Pulse Code Modulation system

Quantising noise can be reduced by decreasing the number of standard levels

Quantising noise can be overcome by companding

Suffers from the disadvantage of its incompatibly with TDM

Large bandwidth is required

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PAM stands for

Phase Analogue Modulation

Phase Amplitude Modulation

Pulse Amplitude Modulation

Pulse Analogue Modulation

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An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

200 and 100.1

200 and 1.01

200 and 200

200 and 10.01

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Under ordinary circumstances, impulse noise can be reduced in

Both AM and FM

FM only

AM only

None of these

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

Remains unchanged

Gets halved

Gets doubled

Gets increased by 50 percent

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

500 ohm

300 ohm

100 ohm

1000 ohm

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For AM receivers the standard IF frequency is

1.07 MHz

106 kHz

455 kHz

10.7 MHz

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The frequency range of 300 kHz to 3000 kHz is known as

Medium frequency

High frequency

Low frequency

Very high frequency

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The colour of an object is decided by

The wavelength transmitted through it

Reflected colour for opaque object and wavelength transmitted through it for transparent objects

The reflected colour

None of these

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