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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 7
1.
Consider the following test signal patterns
  1. Ramp
  2. Grill
  3. Grey shades
  4. Sine pulse
  5. Picture line up generating equipment
Which of the above are used in TV studios?
All
1, 2 and 3 only
1, 2 and 5 only
2, 3, 4 and 5 only
Answer: Option
Explanation:

All these are standard test signals used in TV studios.

2.
If aspect ratio is and number of lines in each frame is 625, the number of picture elements in one frame is
x 625
(625)2
6252
(625)2
Answer: Option
Explanation:

Since there are 625 lines in one frame, the number of picture elements is .

3.
Indicate the false statement: If SWR on a transmission line is infinite, the line is terminated in
open circuit
short circuit
pure reactance
complex impedance
Answer: Option
Explanation:

If line is OC or SC or terminated in pure reactance, SWR is 1.

4.
In TV signals colour burst is used
to maintain colour sequence
to ensure I and Q phase correctly
to synchronise colours
for interlacing of horizontal lines
Answer: Option
Explanation:

Colour burst consists of a short train of about 10 cycles sent to the receiver along with synchronous signals. It ensures I and Q phase correctly.

5.
The resonant frequency of an RF amplifier is 1 MHz and its bandwidth is 10 kHz. The Q factor will be
10
100
0.01
0.1
Answer: Option
Explanation:

.

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