Electronics and Communication Engineering - Signals and Systems

1. 

A. True
B. False

Answer: Option A

Explanation:

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2. 

If

A. -j sgn (f) x X(f)
B. j2pf x ejptf X(f)
C.
D.

Answer: Option A

Explanation:

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3. 

Which of the following is/are not a property/properties power spectral density function Sx(ω)?

A. Sx(ω) is real function of ω
B. Sx(ω) is a even function of ω
C. Sx(ω) is non-positive function of ωSx(ω) ≤ 0 for all ω
D. All of the above

Answer: Option C

Explanation:

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4. 

A casual LTI system is described by the difference equation
2y[n] = ay[n - 2] - 2x[n] + βx[n -1]
The system is stable only if

A. |a| = 2 |β| < 2
B. |a| > 2 |β| > 2
C. |a| < 2 any value of β
D. |β| < 2, any value of a

Answer: Option C

Explanation:

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5. 

Which of the following can be impulse response of a casual system?

A.
B.
C.
D.

Answer: Option B

Explanation:

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