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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 3
21.
Which of the following is true in a tape recorder?
Vow is due to variation in motor speed but flutter is due to some other reason
Both vow and flutter are due to variations in motor speed
Flutter is due to variation in motor speed but vow is due to some other reason
Neither vow nor flutter is due to variation in motor speed
Answer: Option
Explanation:

Small variation (less than 6%) in motor speed causes vow and large variation (more than 6%) in motor speed causes flutter.

22.
In a high speed modem the data rate handled is about
1000 bps
5000 bps
20000 bps
50000 bps
Answer: Option
Explanation:

When data rate is in the range of 2400 to about 10800 bits per second, modem is designated as high speed.

23.
Trinitron is a monochrome picture tube.
True
False
Answer: Option
Explanation:

Frequency band for local programs is fixed.

24.
The first pulse in a TV remote control is
start pulse
preliminary pulse
either start pulse or preliminary pulse
erase pulse
Answer: Option
Explanation:

The first pulse is preliminary pulse followed by start pulse.

25.
If the ratio of ac to dc load impedance of a diode detector is low, the result will be
poor AGC operation
poor AF response
negative peak clipping
diagonal clipping
Answer: Option
Explanation:

Negative peak will be clipped.

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