Electronics and Communication Engineering - Signals and Systems

1. 

Transfer function of a linear system is 200 e-j10ω The system is a

A. distortionless Attenuator
B. amplifier with Phase distortion
C. distortionless Amplifier
D. attenuator with Phase distortion

Answer: Option C

Explanation:

Because H(ω) = 200 e-j10ω

And |H(ω)| = 200 with zero phase.

So it cannot be attenuator.


2. 

which one is discrete time periodic signal?

A. sin 3pn
B. cos 2pn
C. sin 3pn
D. all

Answer: Option C

Explanation:

In Discrete time signal irrational function cannot be periodic, frequency must be rational.

Hence only (c) is periodic.

sin 3pn = sin 3p(n + N) ⇒ for Periodic 3pN = 2Kp

.


3. 

Frequency domain of a periodic triangular function is a

A. discrete sinc function
B. continuous sampling function
C. discrete sampling function
D. continuous sampling square function

Answer: Option D

Explanation:

Because F.T. of a Triangular function is square sampling function.


4. 

The z-transform of sequence n x x[n] is

A.
B.
C.
D.

Answer: Option A

Explanation:

It is differentiation property.


5. 

The inverse Laplace transform of

A. eat
B. -eat
C. 1 - eat
D. -1 + eat

Answer: Option C

Explanation:

.


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