Exercise: Communication Systems

Questions for: Communication Systems

In digital TV digital imaging standard comprises
A:
six profiles and four levels
B:
four levels and six profiles
C:
six profiles and six levels
D:
four profiles and four levels
Answer: A
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The antenna current of an AM transmitter is 8 A. When only the carrier is sent, but it increases to 8.93 A. when the carrier is sinusoidally modulated. The percentage modulation is nearly
A:
90%
B:
80%
C:
75%
D:
70%
Answer: D
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PCM : Quantising Noise :: Transistor :
A:
Partition noise
B:
Shot noise
C:
Whirl
D:
No noise
Answer: A
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In free space, line of sight propagation case, the transmission losses between transmitter and receiver increase with frequency (f) as
A:
f
B:
f2
C:
f4
D:
f1/2
Answer: C
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PAL stands for
A:
Phase Attenuation by Line
B:
Phase Alternation by Line
C:
Parabolic Alternation by Line
D:
Picture Alternation by Line
Answer: B
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