Communication Systems Test

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Communication Systems Test - 3

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Weekly Quiz Competition

Question 1
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Which of these is an example of broadcast communication?

A
Radio

B
Mobile

C
Telephony

D
FAX

Solution

Explanation:In broadcast mode of communication a large number of receivers are linked to a single transmiiter.Radio works as receiver which converts the transmiited information/message into the original form of the information.
Question 2
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Range of an electronic communication system

A
distance to the nearest TV station

B
distance to the nearest Radio station

C
is the largest distance between a source and a destination up to which the signal is received with sufficient strength.

D
is the largest distance the signal can travel

Solution

Explanation:As the distance between the source and the destination increases the strenght of the transmitted signals become weaker and weaker and the distance where it loses energy to travel any more is range of the signal.
Question 3
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In ground wave propagation the earth

A
reflects the waves

B
none of these

C
amplifies the radiated signal

D
attenuates the radiated signal as a result of energy absorption by it
Question 4
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Before transmission the AM produced by a square law device

A
goes through a voltage amplifier

B
goes through a current amplifier

C
goes through a transconductance amplifier

D
goes through a power amplifier

Solution

Before transmission the AM produced by a square law device goes through a power amplifier.
Question 5
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Multiplexing is a scheme for transmitting multiple signals at the same time e.g. speeches of ten persons in different rooms on the same channel. How many transmitters will be required in any multiplexing scheme?

A
one

B
three

C
two

D
ten

Solution

The transmitter required is only one.because the signal needed to be transmitted is one.
Question 6
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Transducer is a device that

A
converts non electrical signals to electrical signals

B
converts electrical signals to non electrical signals

C
converts low power to high power

D
converts high power to low power

Solution

Explanation:Any device which converts energy from one form to another is called a transducer.It converts variation in physical quantities such as pressure,dispalcement,force,temprature etc.Like microphone converts sound signal into an electrical signal.
Question 7
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Bandwidth of an electronic communication system

A
is the maximum frequency at which an equipment

B
is number of bands in the spectrum

C
is the frequency range over which an equipment operates or the portion of the spectrum occupied by the signal

D
is the minimum frequency at which an equipment

Solution

Explanation: A range within a band of wavelengths, frequencies, or energies; especially : a range of radio frequencies which is occupied by a modulated carrier wave, which is assigned to a service, or over which a device can operate.
Question 8
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Ground wave propagation is used for

A
Low frequency greater than 500 MHz and less than 1GHz

B
High frequency greater than 10GHz

C
VLF few MHz

D
High frequency greater than 1GHz
Question 9
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The range of an AM broadcast depends

A
antenna power and carrier frequency

B
carrier frequency only

C
antenna power only

D
none of these
Question 10
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In Amplitude modulation if one of the two side bands is removed by a filter is it possible to recover the modulating signal?

A
Yes if signal is weak

B
Yes

C
No

D
No if the signal is strong

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Re-Attempt Weekly Quiz Competition

Communication Systems Test - 3

Result

Communication Systems Test - 3

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Rank

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SHARING IS CARING

Question 1

Radio

Mobile

Telephony

FAX

Solution

Question 2

distance to the nearest TV station

distance to the nearest Radio station

is the largest distance between a source and a destination up to which the signal is received with sufficient strength.

is the largest distance the signal can travel

Solution

Question 3

reflects the waves

none of these

amplifies the radiated signal

attenuates the radiated signal as a result of energy absorption by it

Question 4

goes through a voltage amplifier

goes through a current amplifier

goes through a transconductance amplifier

goes through a power amplifier

Solution

Question 5

one

three

two

ten

Solution

Question 6

converts non electrical signals to electrical signals

converts electrical signals to non electrical signals

converts low power to high power

converts high power to low power

Solution

Question 7

is the maximum frequency at which an equipment

is number of bands in the spectrum

is the frequency range over which an equipment operates or the portion of the spectrum occupied by the signal

is the minimum frequency at which an equipment

Solution

Question 8

Low frequency greater than 500 MHz and less than 1GHz

High frequency greater than 10GHz

VLF few MHz

High frequency greater than 1GHz

Question 9

antenna power and carrier frequency

carrier frequency only

antenna power only

none of these

Question 10

Yes if signal is weak

Yes

No

No if the signal is strong

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