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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 4
11.
A line has L = 0.8 µH/m and C = 32 pF/m. Z0 =
6000
600
158
15.8
Answer: Option
Explanation:

.

12.
A line has standing waves with a voltage maximum of 35 mV and minimum of 17.5 mV VSWR is
2
4
0.5
0.25
Answer: Option
Explanation:

.

13.
For a bit rate of 8 kbps, the best possible values of the transmitted frequencies in a coherent binary FSK system are
16 kHz and 20 kHz
20 kHz and 32 kHz
20 kHz and 40 kHz
32 kHz and 40 kHz
Answer: Option
Explanation:

where i is integer, and nc is fixed integer.

fi = Rb(nc + i) (3 + 1) x 8 32 kHz

(4 + 1)0.8 40 kHz.

14.
If luminance signal Y = 0.3 R + 0.59 G + 0.11 B, the hue of R - Y colour is
0.7 R - 0.59 G - 0.11 B
- 0.7 R + 0.59 G + 0.11 B
1.3 R - 0.59 G - 0.11 B
none of the above
Answer: Option
Explanation:

R - Y = R - 0.3R - 0.59C - 0.11B = 0.7R - 0.59G - 0.11B.

15.
Trap circuits used in video IF amplifier of colour TV are
High Q, LC resonant circuit
Low Q, LC resonant circuit
High Q, RLC resonant circuit
Low Q, RLC resonant circuit
Answer: Option
Explanation:

High Q LC resonant circuit provides high selectivity.

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