Analog Communications – 1 – 2

6. The auto-correlation function is –

(a) An odd function in t0
(b) An even function in t0
(c) An exponential function in t0
(d) None of the above

Answer
Answer : (b)

Explanation
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7. The auto-correlation function of a signal (t) at to = 0 is equal to –

(a) Zero
(b) Infinite
(c) Average voltage of the signal
(d) Average power of the signal

Answer
Answer : (d)

Explanation
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8. The auto-correlation function of white noise is a –

(a) Step function
(b) Impulse function
(c) Gaussian function
(d) Constant

Answer
Answer : (b)

Explanation
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9. A random process is defined as ergodic if –

(a) All type of ensemble averages are not changeable
(b) All type of ensemble averages are constant
(c) All type of ensemble averages are interchangeable
(d) None of these

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

10. Audio frequency range lies between –

(a) 20 Hz to 20 kHz
(b) 20 kHz to 200 kHz
(c) 2 MHz to 20 MHz
(d) 20 MHz to 200 MHz

Answer
Answer : (a)

Explanation
No answer description available for this question. Let us discuss.

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