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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 10
36.
Consider the following statements as regards SAW filter
  1. The centre frequency is determined by the pitch of IDT comb shaped electrodes
  2. The response can be modified shaping the overlap of comb electrodes
  3. The response is maximum when acoustic wave has its wavelength equal to pitch
  4. When a number of identical electrodes are arranged at the same pitch, the frequency characteristics of the filter is expressed by (sin x)/x
Which of the above statements are correct?
1, 2, 3, 4
1, 2, 3 only
1, 2, 4 only
2, 3, 4 only
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
In telephone, the dial tone has a frequency of
5 Hz
15 Hz
33 Hz
233 Hz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Companding is used
to overcome quantising noise in PCM
in PWM receivers to reduce impulse noise
to protect small signals in PCM from quantising noise
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
For a good public address system the sound intensity at the farthest point should be at least
20 dB over threshold of hearing
40 dB over threshold of hearing
80 dB over threshold of hearing
120 dB over threshold of hearing
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
An ungrounded antenna near the ground
is horizontally polarized
acts as an antenna array
acts as a single antenna of twice the height
is not likely to need an earth mat
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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