Discussion
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- Question
A carrier wave carries information.
Options- A. True
- B. False
- Correct Answer
- False
ExplanationCarrier does not have any information.
Communication Systems problems
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- 1. 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 Discuss
Correct Answer: upto 600 bps
Explanation:
When data rate in bits per second is upto 600, modem is low speed.- 2. Counterpoise is used in coils having
Options- A. high resistivity
- B. low resistivity
- C. medium resistivity
- D. both (b) and (c) Discuss
Correct Answer: high resistivity
Explanation:
Counterpoise is a horizontally buried wire used to provide low grounding resistance in high resistivity soils.- 3. The velocity of sound waves in air
Options- A. is constant at all temperatures
- B. varies directly as temperature
- C. varies inversely as absolute temperature
- D. varies directly as square root of absolute temperature Discuss
Correct Answer: varies directly as square root of absolute temperature
Explanation:
v ? T.- 4. As the frequency increases, the absorption of ground wave by earth's surface
Options- A. decreases
- B. increases
- C. remains the same
- D. either (a) or (c) Discuss
Correct Answer: increases
Explanation:
Because of this reason ground waves can be used for frequencies upto about 1600 kHz only.- 5. The colour subcarrier and sidebands produced by its modulation with the chrominance signals are accommodated in the standard channel width by the process of
Options- A. frequency adjustment
- B. frequency interleaving
- C. frequency changing
- D. frequency amalgamation Discuss
Correct Answer: frequency interleaving
Explanation:
In frequency interleaving the space between bundles is used for colour signal.- 6. 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 Discuss
Correct Answer: low pass filter
Explanation:
Woofer is a low frequency loud speaker covering the range 16 Hz to 500 Hz.- 7. A generator is feeding power to a transmission line of characteristic impedance Z0. The line is terminated in impedance ZL. Standing waves will be set up if
Options- A. ZL = Z0
- B. ZL < Z0
- C. ZL > Z0
- D. both (b) and (c) Discuss
Correct Answer: both (b) and (c)
Explanation:
Both the case, i.e., ZL > Z0 and ZL < Z0 give rise to standing waves.- 8. A 400 W carrier is amplitude modulated with m = 0.75. The total power in AM is
Options- A. 400 W
- B. 512 W
- C. 588 W
- D. 650 W Discuss
Correct Answer: 512 W
Explanation:
.
- 9. In sound recording the degree of pre-emphasis is about 6 dB/ octave.
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
It erases the matter already existing on the tape.- 10. Tracking of extra terrestrial objects requires
Options- A. high transmitting power
- B. very sensitive receiver
- C. fully steerable antenna
- D. all of the above Discuss
Correct Answer: all of the above
Explanation:
All the three are required.
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