In sound recording the degree of pre-emphasis is about 6 dB/ octave. True False

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Question
In sound recording the degree of pre-emphasis is about 6 dB/ octave.
Options
A. True
B. False

Correct Answer

False

Explanation

It erases the matter already existing on the tape.

Communication Systems problems

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2. 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)

3. 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

5. A modem is classified as low speed if data rate handled is
Options
A. upto 100 bps
B. upto 250 bps
C. upto 400 bps
D. upto 600 bps

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

7. 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

8. 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.

9. 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

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

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