Exercise: Communication Systems

Questions for: Communication Systems

In case of probability of the message is 1 to 16 then the information will be
A:
16 bits
B:
8 bits
C:
4 bits
D:
2 bits
Answer: C

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In PAL system weighting of R - Y and B - Y signals is done to
A:
prevent over modulation on saturated colours
B:
prevent under modulation of saturated colours
C:
allow over modulation of saturated colours
D:
allow under modulation on saturated colours
Answer: A

Weighting reduces the chances of over-modulation of the transmitter carrier in the presence of highly saturated colours when picture has very light or very dark parts.

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Which of the following microphones works on the piezoelectric effect?
A:
Carbon
B:
Condenser
C:
Moving coil
D:
Crystal
Answer: D

As per piezoelectric effect application of pressure across the faces of a crystal produces an emf across the faces.

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The antenna diameter of a radar system is doubled. The maximum range will
A:
be doubled
B:
become four times
C:
be halved
D:
decrease to one fourth
Answer: A

Range is proportional to antenna diameter.

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A device has two resistances 300 ÎĐ and 200 ÎĐ respectively. The noise voltages due to these two resistance calculated separately are 5.38 ΞV and 4.38 ΞV respectively. When both of them are used together, the noise voltage will be
A:
9.76 V
B:
1 ΞV
C:
23.56 ΞV
D:
6.94 ΞV
Answer: D

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