Exam (elaborations)
Chapter Fifteen COMMUNICATION SYSTEMS
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Chapter Fifteen COMMUNICATION SYSTEMS
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Exemplar Problems–PhysicsChapter Fifteen
COMMUNICATION
SYSTEMS
MCQ I
15.1 Three waves A, B and C of frequencies 1600 kHz, 5 MHz and
60 MHz, respectively are to be transmitted from one place to
another. Which of the following is the most appropriate mode of
communication:
(a) A is transmitted via space wave while B and C are transmitted
via sky wave.
(b) A is transmitted via ground wave, B via sky wave and C via
space wave.
(c) B and C are transmitted via ground wave while A is transmitted
via sky wave.
(d) B is transmitted via ground wave while A and C are transmitted
via space wave.
15.2 A 100m long antenna is mounted on a 500m tall building. The
complex can become a transmission tower for waves with λ
(a) ~ 400 m.
(b) ~ 25 m.
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, Communication Systems
(c) ~ 150 m.
(d) ~ 2400 m.
15.3 A 1 KW signal is transmitted using a communication channel
which provides attenuation at the rate of – 2dB per km. If the
communication channel has a total length of 5 km, the power of
P0
the signal received is [gain in dB = 10 log P ]
i
(a) 900 W.
(b) 100 W.
(c) 990 W.
(d) 1010 W.
15.4 A speech signal of 3 kHz is used to modulate a carrier signal of
frequency 1 MHz, using amplitude modulation. The frequencies
of the side bands will be
(a) 1.003 MHz and 0.997 MHz.
(b) 3001 kHz and 2997 kHz.
(c) 1003 kHz and 1000 kHz.
(d) 1 MHz and 0.997 MHz.
15.5 A message signal of frequency ωm is superposed on a carrier wave
of frequency ωc to get an amplitude modulated wave (AM).
The frequency of the AM wave will be
(a) ωm.
(b) ωC.
ωc + ωm
(c) .
2
ωc – ωm
(d) .
2
15.6 I-V characteristics of four devices are shown in Fig. 15.1
I I I
I
V V V V
(i) (ii) (iii) (iv)
Fig. 15.1
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