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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 2
31.
In a TV, studio the function of vision switcher is to
edit television programs
relay television programs
control zoom lens
mix audio and video signals
Answer: Option
Explanation:

Viscon switcher has a provision to select any one or more of a large number of inputs and switching then on to outgoing circuits.

32.
In the equation of M-ary PSK signal (where Ey is symbol energy), M becomes large. Then d will approach
2
infinity
zero
1
Answer: Option
Explanation:

When M is large, sine term will tend to zero.

33.
The trapezoidal pattern of figure is obtained when examining an AM wave by an oscilloscope. Modulation factor of the wave is
0.33
0.5
2
1
Answer: Option
Explanation:

.

34.
Y signal has maximum percentage of
red colour
blue colour
green colour
red and blue colours
Answer: Option
Explanation:

Y = 0.3 R + 0.59 G + 0.11 B.

35.
To ensure good transient response in audio systems the natural frequencies should be
above 40 Hz and below 15 kHz
above 40 Hz
above 15 kHz
below 40 Hz and above 15 kHz
Answer: Option
Explanation:

The useful audio range is 40 Hz to 15 kHz. Therefore natural frequency should be outside this range.

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