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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 12
16.
The decoder for PAL system is
similar to NTSC decoder
similar to NTSC decoder supplemented by 64 ms delay line
similar to NTSC decoder supplemented by 64 ms delay line and an electronic commutator
either (b) or (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
CW Doppler radar is capable of giving accurate measurements of relative velocities.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
In the stabilized reactance modulators AFC system
the discriminator must have a fast time constant to prevent demodulation
the higher discriminator frequency the better the oscillator frequency stability
the discriminator frequency must not be too low, or the system will fail
phase modulation is converted into FM by the equalizer circuit
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
An antenna is 30 metre high. The frequency is 1 MHz. The radiation resistance is about
1500 Ω
150 Ω
15 Ω
1.5 Ω
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
Which of the following codes is based on BCD format?
EBCDIC
ASCII
Hollerith
both (a) and (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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