IndiaBIX

Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 21
16.
In high power AM transmission, modulation is done at
IF stage
buffer stage
RF stage
oscillator stage
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
The noise sources shot noise, partition noise and thermal noise are associated with which component
BJT
diode
resistor
capacitor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Consider the following statements as regards communication receiver
  1. Variable sensitivity is used to eliminate selective fading
  2. A product demodulator can be used to receive Morse code
  3. The noise limiter cuts off receiver output during a noise pulse
  4. Double conversion is used to improve image rejection
Which of the above statements are correct?
1, 2, 3, 4
1, 2, 3
2, 3, 4
1, 3, 4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
In a transmission line, losses due to dielectric heating are
proportional to voltage and inversely proportional to Z0
proportional to voltage and proportional to Z0
proportional to current and proportional to Z0
proportional to current and inversely proportional to Z0
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
The power rating of radio transmitters is around
100 mW
10 W
10 kW
10 MW
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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