Communication System Test

Result

Communication System Test - 17

Score
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Rank
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Weekly Quiz Competition

Question 1
4 / -1

Which of the following alternative is not nature Noise ?

A
Thunder of light

B
Radiation coming from sun

C
Radiation coming from stars

D
Radiation produced by flickering of tube light
Question 2
4 / -1

In optical fibre communication, the APD semi conductor device is used

A
to convert radio single into optical single

B
to obtain intanxty modulated signal

C
to convert optical signal into electrical signal

D
to convert optical signal into electrical signal
Question 3
4 / -1

Phase difference between space current and capacitive current is

A

B

C

D
Question 4
4 / -1

Refractive index of ionosphere is

A
One

B
More than one

C
less than one

D
Zero
Question 5
4 / -1

In an amplitude modulated wave for audio frequency of 500 cycle/second, the appropriate carrier frequency will be

A
50 cycles/s

B
100 cycles/s

C
500 cycles/s

D
50,000 cycles/s
Question 6
4 / -1

AM is used for broadcasting because

A
It is more noise immune than other modulation systems

B
It requires less transmitting power compared with other systems

C
Its use avoids receiver complexity

D
No other modulation system can provide the necessary bandwidth faithful transmission
Question 7
4 / -1

Range of frequencies allotted for commercial FM radio broadcast is

A
88 to 108 MHz

B
88 to 108 kHz

C
8 to 88 MHz

D
88 to 108 GHz
Question 8
4 / -1

The velocity factor of a transmission line is x. If dielectric constant of the medium is 2.6, value of x is

A
0.26

B
0.62

C
2.6

D
6.2

Solution
Question 9
4 / -1

The process of superimposing signal frequency (i. e., audio wave) on the carrier wave is known as

A
Transmission

B
Reception

C
Modulation

D
Detection
Question 10
4 / -1

Long distance short-wave radio broadcasting uses

A
Ground wave

B
Ionospheric wave

C
Direct wave

D
Sky wave