Electronics and Communication Engineering - Communication Systems

41.
In a two stage cascade amplifier the equivalent noise temperatures are Te1 and Te2. If the gains of the two stages are G1 and G2, the overall noise temperature Te is
Answer: Option
Explanation:
No answer description is available. Let's discuss.

42.
The modulation index of a narrowband FM signal is
nearly equal to 0.3
much less than unity
nearly 0.5
much more than unity
Answer: Option
Explanation:
No answer description is available. Let's discuss.

43.
Which is a digital coding technique?
PCM
DM
DPCM
All
Answer: Option
Explanation:
No answer description is available. Let's discuss.

44.
Which of the following noise sources is different from others?
Cosmic
Solar
Atmospheric
Galactic
Answer: Option
Explanation:
No answer description is available. Let's discuss.

45.
For the transmission of normal speech, the PCM channel needs a bandwidth of __________ kHz.
2
4
16
32
Answer: Option
Explanation:
No answer description is available. Let's discuss.