# Signals & Systems MCQ Electronics Engineering Questions Answers

## Signals & Systems Electronics Engineering MCQ Questions Answers ECE

1) If a function f(t) u(t) is shifted to right side by t0,then the function can be expressed as

a) f(t – t0) u(t)

b) f(t) u(t – t0)

c) f(t – t0) u(t – t0)

d) f(t +t0) u(t + t0)

Option – c)

2) Damped sinusoids are _____

sinusoid signals multiplied by growing exponentials
b. sinusoid signals divided by growing exponentials
c. sinusoid signals multiplied by decaying exponentials
d. sinusoid signals divided by decaying exponentials

Option – c)

3) The poles of a digital filter with linear phase response can lie

a)only at z = 0

b) only on the unit circle

c)only inside the unit circle but not at z = 0

d) on the left side of Real (z) =0 line

Option – a)

4) Which block of the discrete time systems requires memory in order to store the previous input?

b. Signal Multiplier
c. Unit Delay

Option – c)

5) The covariance function of a band limited white noise is

a) A Dirac delta function

b) An exponentially decreasing function

c) A sinc function

d) A sinc2 function

Option – c)

6) What are the number of samples present in an impulse response called as?

string
b. array
c. length
d. element

Option – c)

7) Two rectangular waveforms of duration T1 and T2 seconds are convolved. What is the shape of the resulting waveform ?

a) Triangular

b) Rectangular

c) Trapezoidal

d) Semi-circular

Option – c)

8) A discrete LTI system is non-causal if its impulse response is

a) anu(n -2)

b) an-2u(n)

c) an+2u(n)

d) anu(n +2)

Option – d)

9) What is the number of roots of the polynomial F(z) = 4z3 – 8z2 –z + 2, lying outside the unit circle ?

a) 0

b) 1

c) 2

d) 3