Question 1-5 of 6: Basic Principles of Amplitude, Frequency & Phase Modulation (Electric Communications) | ISRO, NIC, & NIELIT Scientist (B) Electronics | Includes PYQs | Get Solutions with Detailed Explanations
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Question 1
MCQ
Read the question, then carefully choose the correct answer(s).
Appeared in Year: 2011
The modulation index of an amplitude modulated wave is changed from 0 to 1. The transmitted power is
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Increased by 50 percent. | |
b. | Doubled | |
c. | Unchanged | |
d. | Halved | |
Question 2
MCQ
Read the question, then carefully choose the correct answer(s).
Appeared in Year: 2011
In case of which of the following, an increase on the modulation index leads to increase in bandwidth
Choices
| Choice (4) | Response | |
|---|---|---|
a. | PM | |
b. | FM | |
c. | AM | |
d. | Both a. and b. are correct. | |
Question 3
MCQ
Read the question, then carefully choose the correct answer(s).
Appeared in Year: 2011
Four voice signals, each limited to 4 kHz and sampled at Nyquist rate, are converted into binary PCM signal using 256 quantization levels. The bit transmission rate for the time-division multiplexing signal will be
Choices
| Choice (4) | Response | |
|---|---|---|
a. | 256 kbps | |
b. | 5126 kbps | |
c. | 8 kbps | |
d. | 64 kbps | |
Question 4
MCQ
Read the question, then carefully choose the correct answer(s).
Appeared in Year: 2012
An Ideal power limited communication channel with additive white Gaussian noise is having 4 kHz band width and Signal to Noise ratio of 255. The channel capacity is:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | 32 kilobits/sec | |
b. | 9.63 kilobits/sec | |
c. | 8 kilobits/sec | |
d. | 16 kilobits/sec | |
Question 5
MCQ
Read the question, then carefully choose the correct answer(s).
Appeared in Year: 2014
Which of the following modulation scheme is most bandwidth efficient?
Choices
| Choice (4) | Response | |
|---|---|---|
a. | AM | |
b. | FM | |
c. | SSB-SC | |
d. | PM | |