A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz aud

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Question
A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz audio sine waves. Which of the following frequency is least likely to be present in the output?
Options
A. 1002 kHz
B. 1000 kHz
C. 999.2 kHz
D. 998.0 kHz

Correct Answer

1000 kHz

Explanation

Frequency present in the sidebands is equal to = f_c � f_m, f_c � 2f_m , f_c � 3f_m .

Communication Systems problems

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1. Tracking of extra terrestrial objects requires
Options
A. high transmitting power
B. very sensitive receiver
C. fully steerable antenna
D. all of the above

4. A generator is feeding power to a transmission line of characteristic impedance Z₀. The line is terminated in impedance Z_L. Standing waves will be set up if
Options
A. Z_L = Z₀
B. Z_L < Z₀
C. Z_L > Z₀
D. both (b) and (c)

5. A woofer should be fed from the input through a
Options
A. low pass filter
B. high pass filter
C. band pass filter
D. band stop filter

6. If C is capacity of noisy channel, (bits/s), ?f is bandwidth Hz and S/N is signal to noise ratio, then
Options
A.
B.
C.
D.

7. Which of the following cannot be the Fourier series expansion of a periodic signal?
Options
A. x(t) = 2 cos t + 3 cos 3t
B. x(t) = 2 cos pt + 7 cos t
C. x(t) = cos t + 0.5
D. x(t) = 2 cos 1.5pt + sin 3.5 pt

8. In colour TV receiver, varactor diode is used for
Options
A. detection
B. rectification
C. tuning
D. both (a) and (b)

9. Frequency shift keying is used mostly in
Options
A. telegraphy
B. telephony
C. satellite communication
D. radio transmission

10. Which of the following has the highest input impedance?
Options
A. CE
B. CB
C. CC
D. Push pull

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