Order Communication System Discussion

Order Communication System Discussion
Order Communication System Discussion
1. In a communication system, noise is most
likely to affect the signal
(a) at the transmitter.
(b) in the channel or in the transmission
line.
(c) in the information source.
(d) at the receiver.
2. An example of point to point mode of
communication is
(a) FM radio
(b) Standard FM radio
(c) Television
(d) Telephony
3. The waves that are bent down by the
ionosphere are
(a) ground waves
(b) surface waves
(c) direct waves
(d) sky waves
4. The electromagnetic waves of frequency
2MHz to 30 MHz are used
(a) in ground wave propagation.
(b) in sky wave propagation.
(c) in microwave propagation.
(d) In satellite communication.
Order Communication System Discussion
5. Through which mode of propagation, the
radio waves can be sent from one place to
another
(a) Ground wave propagation
(b) Sky wave propagation
(c) Space wave propagation
(d) All of the above
6. Assertion (A) Short wave bands are used
for transmission of radio waves to a large
distance.
Reason (R) Short waves are reflected
from ionosphere.
Codes
(a) Both A and R are true and R is the
correct explanation of A
(b) Both A and R are true, but R is not the
correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
7. Assertion (A) Microwave propagation
is better than the sky wave propagation.
Reason (R) Microwaves have
frequencies 100 to 300 GHz, which
have very good directional properties.
Codes
(a) Both A and R are true and R is the
correct explanation of A
(b) Both A and R are true, but R is not the
correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
8. …… are used for communication in
artificial satellites.
[SSC 2017, RRB 2016]
(a) Infrared waves
(b) Radio waves
(c) Ultraviolet (UV) rays
(d) Amplitude Modulation (AM) waves
9. Which electromagnetic radiation is
used for satellite communication?
[SSC (10 2) 2012]
(a) Ultraviolet
(b) Infrared
(c) Microwave
(d) Millimeter wave
10. Modulation is the process of
superposing
(a) low frequency audio signal on
high frequency waves.
(b) low frequency radio signal on low
frequency audio waves.
(c) high frequency audio signal on
low frequency radio waves
(d) low frequency audio signal on low
frequency radio waves.
11. In amplitude modulation, the band
width
(a) twice the audio signal frequency.
(b) thrice the audio signal frequency.
(c) twice the carrier wave frequency.
(d) sum of audio signal frequency
and carrier wave frequency.
12. In frequency modulation
(a) the amplitude of modulated wave
varies as frequency of carrier
wave.
(b) the frequency of modulated wave
varies as amplitude of modulating
wave.
(c) the frequency of modulated wave
varies as frequency of
modulating wave.
(d) the frequency of modulated wave
varies as frequency of carrier
wave.
13. Which of the following is the
disadvantage of FM over AM?
(a) Larger band width requirement
(b) Larger noise
(c) Higher modulation power
(d) Low efficiency
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