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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 7
6.
The total number of pulses in a TV remote control is
14
12
10
8
Answer: Option
Explanation:

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

7.
Which camera tube has highest sensitivity and very wide spectral response?
Vidicon
Plumbicon
New vicon
Saticon
Answer: Option
Explanation:

New vicon has very high sensitivity and very wide spectral response which extends well into infrared region.

8.

Assertion (A): A Smith chart can be used for a number of calculations of a transmission line

Reason (R): Smith chart is basically a polar impedance diagram.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
Answer: Option
Explanation:

Smith chart is a convenient tool for transmission line design and analysis.

9.
A computer monitor uses 180 W in normal operation and 20 W in sleep mode. The computer is on all the 24 hours but is in sleep mode for 18 hours a days. The energy units saved in 30 days are
0.54 units
86.4 units
2.88 units
4.8 units
Answer: Option
Explanation:

.

10.
Consider the following functions
  1. It detects the AM video carrier IF so as to produce the video signal
  2. It produces and separates out the inter carrier sound IF of 5.5 MHz
  3. It amplifies the video signal
  4. It amplifies the audio signal
The video detector in a colour TV performs which of the above functions
1, 2 and 3
1, 2, 3 and 4
1 and 2
1, 2 and 4
Answer: Option
Explanation:

Video detector does not amplify any signal.

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