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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 19
16.
A monostable multivibrator is used to generate PWM because it can
differentiator
integrator
voltage-to-frequency converter
generate pulses
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
Consider the following statements in amplitude modulation
  1. The harmonic and intermodulation distortion may occur in audio and RF amplifiers
  2. The sum and difference frequencies are present in the output of mixer
  3. The diode detector has audio frequencies in its output
  4. A balanced modulator cannot produce an AM with suppressed carrier
Which of the above are true?
1, 2, 3, 4
1, 2, 3
1, 2
3, 4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
A resistor R is in parallel with capacitance C. The rms noise voltage of resistor in the equivalent circuit can be written as
kTC
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.

Assertion (A): In angle modulation the transmitted amplitude is constant.

Reason (R): Angle modulation has good immunity to noise and interference.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz audio sine waves. The frequencies present in the output will be
998 kHz and 1002 kHz
998 kHz, 999.2 kHz, 1000.8 kHz, 1002.0 kHz
998 kHz, 999.2 kHz, 999.7 kHz, 1000.3 kHz, 1000.8 kHz and 1000.2 kHz
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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