Question

Question

This question was previously asked in

DFCCIL Executive S&T 2018 Official Paper

Answer 1

Concept:

Unit impulse function:

It is defined as,

The discrete-time version of the unit impulse is defined by

Properties:

1.

2.

3. x(t) δ(t – t0) = x(t0)

4.

5.

6.

Calculation:

Using property (3) in the above equation:

As t = 3, lies outside the limit

so y = 0 or we can say that

Hence option (4) is the correct answer.

Answer (Detailed Solution Below)