Question

Unit Impulse function is obtained by using the limiting process on which among the following functions?

(a) Triangular Function

(b) Rectangular Function

(c) Signum Function

(d) Sinc Function

I had been asked this question in examination.

My query is from Useful Signals topic in portion Signals and Systems Basics of Signals and Systems

Answer 1

The correct answer is (b) Rectangular Function

For explanation I would say: Unit impulse function can be obtained by using a limiting process on the rectangular pulse function. Area under the rectangular pulse is equal to unity.