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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 21
31.
Household taperecorders generally use
crystal microphone
moving coil microphone
condenser microphone
cardioid microphone
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
In AM receiver the oscillator frequency is
always equal to signal frequency
always equal to 455 kHz
always higher than signal frequency
always lower than signal frequency
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
The modulation index of an AM wave is measured using a CRO. The waveform is as shown in figure, the modulation index is nearly
43%
30%
23%
17%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
A photo diode converts light signals to binary.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
A three stage telephone switching structure is to have 128 input and 128 output terminals. It has been found that at peak time the utilization probability is 0.1. The number of intermediate links required for non-blocking configuration is 15. If the actual number of intermediate links is 5, the probability of blocking of call is
1%
0.5%
0.2%
0.1%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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