# Electronics and Communication Engineering - Signals and Systems

Exercise : Signals and Systems - Section 1

- Signals and Systems - Section 1
- Signals and Systems - Section 2
- Signals and Systems - Section 3
- Signals and Systems - Section 4
- Signals and Systems - Section 5
- Signals and Systems - Section 6
- Signals and Systems - Section 7
- Signals and Systems - Section 8
- Signals and Systems - Section 9
- Signals and Systems - Section 10

36.

The signal defined by the equations

*f*(*t*) = 0 for*t*< 0,*f*(*t*) = E for 0 ≤*t*≤*a*and*f*(*t*) = 0 for*t*>*a*isAnswer: Option

Explanation:

It is a pulse lasting for *t* = *a*.

37.

Inverse Laplace transform of is

Answer: Option

Explanation:

*f*(*t*) = *e*^{-2t} + *e*^{-3t}.

38.

Two function

*g*_{1}(*t*) and*g*_{2}(*t*) with correlation of 6 has average power of 4 and 5 respectively. The power of*g*_{1}(*t*) +*g*_{2}(*t*) isAnswer: Option

Explanation:

Power of two correlated signal is P = P_{1} + P_{2} +2R_{1}, _{2}(t).

39.

A box has 4 white and 3 red balls. Two balls are taken out in succession. What is the probability that both are white?

Answer: Option

Explanation:

The probability that first ball is white is and the probability the second ball is white is . The probability that both are white is .

40.

Z transform is a non-linear operation.

Answer: Option

Explanation:

Z transform is a linear operation.

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