Question: 16 -

What is the correct sequence of procedures to perform on h(n) to convolute x(n) and y(n)?

Summation folding shifting multiplication with x(n)

Multiplication with x(n)summation folding shifting

Shifting summation folding multiplication with x(n)

Folding shifting multiplication with x(n)summation

Answer:

Folding shifting multiplication with x(n)summation

Solution not available.

Question: 17 -

What is the necessary condition for an LTI system to be causal in nature?

For negative value of n, impulse response should be non-zero

For positive value of n, impulse response should be non-zero

For negative value of n, impulse response should be zero

For positive value of n, impulse response should zero

Answer:

For negative value of n, impulse response should be zero

Solution not available.

Question: 18 -

If the output of the system of the system at any ‘n’ depends only the present or the past values of the inputs then the system is said to be ________

Linear

Causal

Non-Linear

Non-causal

Answer:

Causal

Solution:

A system is said to be causal if the output of the system is defined as the function shown below
y(n)=F[x(n),x(n-1),x(n-2),…] So, according to the conditions given in the question, the system is a causal system.

Question: 19 -

How is the unit ramp signal defined in discrete-time function?

u(n)=n for n≤0;u(n)=0 for n>0  

None of these

u(n)=n for n>0;u(n)=0 for n≤0   

u(n)=n for n≥0;u(n)=0 for n<0  

Answer:

u(n)=n for n≥0;u(n)=0 for n<0  

Solution not available.

Question: 20 -

If a system do not have a bounded output for bounded input, then the system is said to be __________

Stable

Unstable

Non-causal

Causal

Answer:

Unstable

Solution:

An arbitrary relaxed system is said to be BIBO stable if it has a bounded output for every value in the bounded input. So, the system given in the question is a Non-stable system.