Exercise: Communication Systems

Questions for: Communication Systems

Consider the following statements about Rhombic antenna
  1. It is non resonant
  2. It is a broad band antenna
  3. It is ideally suited for HF transmission
Which of the above are correct?
A:
1, 2, 3
B:
1, 3 only
C:
2, 3 only
D:
1 only
Answer: A

All the three features are correct.

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If Eb, the energy per bit of a binary digital signal is 10-6 watt sec. and the one sided power spectral density of the white noise N0 = 10-5 W/Hz, then the output SNR of the matched filter is
A:
26 dB
B:
10 dB
C:
20 dB
D:
13 dB
Answer: D

O/P SNR = 10 log10 [2 x 10-6 x 10-5].

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A directional microphone gives an output of 0.5 mV whereas an omnidirectional one gives an output of 0.5 ΞV in the same position for the same sound pressure. The directivity of the directional microphone is
A:
120 dB
B:
90 dB
C:
60 dB
D:
30 dB
Answer: C

Directivity =

= 60 dB.

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The Nyquist sampling interval, for the signal sin c (700t) + sin c (5000 t) is
A:
B:
C:
D:
Answer: C

g(t) = sin c (700 t) + sin c (500 t)

[sin (p 700 t) + sin (p 500 t)]

fm = 350 Hz

fs = 700 Hz, Nyquist rate = .

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The radar cross-section of a target depends an
A:
frequency
B:
polarization of incident wave
C:
aspect of target
D:
all of the above
Answer: D

Effective area of target is called radar cross-section.

It depends on frequency polarization of incident wave and aspect of target.

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