MCQOPTIONS
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MCQOPTIONS
This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The average power of white noise is |
| A. | Zero |
| B. | Unity |
| C. | Infinity |
| D. | Between zero and one |
| Answer» D. Between zero and one | |
| 2. |
Standard deviation is ______ |
| A. | Rms value of dc |
| B. | Rms value or ac |
| C. | Either ac or dc |
| D. | Neither dc nor ac |
| Answer» C. Either ac or dc | |
| 3. |
The autocorrelation function is maximum at |
| A. | Origin |
| B. | Infinity |
| C. | Origin & Infinity |
| D. | None of the mentioned |
| Answer» B. Infinity | |
| 4. |
For a stationary process, autocorrelation function depends on |
| A. | Time |
| B. | Time difference |
| C. | Does not depend on time |
| D. | None of the mentioned |
| Answer» C. Does not depend on time | |
| 5. |
THE_AUTOCORRELATION_FUNCTION_IS_MAXIMUM_AT?$ |
| A. | Origin |
| B. | Infinity |
| C. | Origin & Infinity |
| D. | None of the mentioned |
| Answer» B. Infinity | |
| 6. |
The average power of white noise is$ |
| A. | Zero |
| B. | Unity |
| C. | Infinity |
| D. | Between zero and one |
| Answer» D. Between zero and one | |
| 7. |
Standard deviation is ______$ |
| A. | Rms value of dc |
| B. | Rms value or ac |
| C. | Either ac or dc |
| D. | Neither dc nor ac |
| Answer» C. Either ac or dc | |
| 8. |
White noise has _____ mean and ______ variance. |
| A. | Zero and zero |
| B. | Finite and zero |
| C. | Zero and finite |
| D. | One and zero |
| Answer» D. One and zero | |
| 9. |
For a stationary process, autocorrelation function depends o? |
| A. | Time |
| B. | Time difference |
| C. | Does not depend on time |
| D. | None of the mentioned |
| Answer» C. Does not depend on time | |
| 10. |
A random process is called as stationary in strict sense if |
| A. | Its statistics vary with shift in time origin |
| B. | Its statistics does not vary with shift in time origin |
| C. | Its autocorrelation vary with shift in time |
| D. | Its autocorrelation does not vary with shift in time |
| Answer» B. Its statistics does not vary with shift in time origin | |
| 11. |
Random process is a function of ______ |
| A. | Random event and time |
| B. | Random event and frequency |
| C. | Random event and real number |
| D. | None of the mentioned |
| Answer» B. Random event and frequency | |
| 12. |
Which gives the measure of randomness of the random variable? |
| A. | Mean |
| B. | Variance |
| C. | Standard variance |
| D. | |
| Answer» C. Standard variance | |
| 13. |
The value of the probability density function of random variable is |
| A. | Positive function |
| B. | Negative function |
| C. | Zero |
| D. | One |
| Answer» B. Negative function | |
| 14. |
The distribution function of -(infinity) and (infinity) is _____ |
| A. | 0 and 1 |
| B. | 1 and 0 |
| C. | Both 0 |
| D. | Both 1 |
| Answer» B. 1 and 0 | |
| 15. |
The distribution function of random variable is |
| A. | P(X less than or equal to x) |
| B. | P(X greater than or equal to x) |
| C. | P(X less than x) |
| D. | P(X greater than x) |
| Answer» B. P(X greater than or equal to x) | |
| 16. |
Random variables give relationship between _____ |
| A. | Two random events |
| B. | Probability of occurence of two random events |
| C. | Random event and a real number |
| D. | Random event and its probability of occurrence |
| Answer» D. Random event and its probability of occurrence | |