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

EXPLANATION

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

EXPLANATION

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

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

ANSWER

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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