Exercise: Communication Systems

Questions for: Communication Systems

The total number of pulses in a TV remote control is
A:
14
B:
12
C:
10
D:
8
Answer: A

The 14 pulses are preliminary pulse, start pulse, stop pulse and 11 other pulses.

📖
📝
💬
👁️
The resonant frequency of an RF amplifier is 1 MHz and its bandwidth is 10 kHz. The Q factor will be
A:
10
B:
100
C:
0.01
D:
0.1
Answer: B

.

📖
📝
💬
👁️
In TV signals colour burst is used
A:
to maintain colour sequence
B:
to ensure I and Q phase correctly
C:
to synchronise colours
D:
for interlacing of horizontal lines
Answer: B

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.

📖
📝
💬
👁️
Indicate the false statement: If SWR on a transmission line is infinite, the line is terminated in
A:
open circuit
B:
short circuit
C:
pure reactance
D:
complex impedance
Answer: D

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

📖
📝
💬
👁️
If aspect ratio is and number of lines in each frame is 625, the number of picture elements in one frame is
A:
x 625
B:
(625)2
C:
6252
D:
(625)2
Answer: B

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

📖
📝
💬
👁️
Ad Slot (Above Pagination)
Quiz