# Operations on Signals – 2 MCQ’s

This set of MATLAB Multiple Choice Questions & Answers (MCQs) focuses on “Operations on Signals – 2″.

1. What is the output of the following code?

b={1 2 3}; c={ 1 2 3} b+c

a) Error

b) { 2 4 6 }

c) { 1 2 3 }

d) Cannot be determined

2. What is the output of the following code?

plot([-5:1:5],tripuls([-4:1:4])

a) Error

b) Generates a triangular pulse signal

c) Generates a sawtooth signal

d) Cannot be determined

3. Discrete time convolution is not possible in MATLAB.

a) True

b) False

4. What is the output of the following code?advertisement

t=[0:1:2]; plot(t,p); hold; plot(-t,p);

a) A mirror image of ramp function from 0 to 2 units in time

b) A ramp function from 0 to 2 units in time and it’s a mirror image in the same window

c) A ramp function from 0 to 2 units in time

d) Error

5. If x(t-5)=0 for t<5 = A for t>=5, the signal is ___________

a) Causal

b) Symmetric

c) Linear, Time Invariant and Causal

d) Cannot be determined

6. plot([0:1:8],[rectpulse(1,9)]’) and plot([0:1:8],ones(1,9)) will generate the same graph.

a) True

b) False

7. What is the output of the following code?

>>p=[zeros(1,5),ones(1,6)]; >> t=0:1:10; >> plot(t,p);

a) r(t-5)-r(t-6)-u(t-10)

b) r(t-5)-u(t-6)-u(t-10)

c) r(t-5)-u(t-6)-r(t-10)

d) r(t-5)-r(t-6)-r(t-10)

8. What is the output of the following code?

a=[zeros(1,4) [rectpulse(1,5)]’ zeros(1,6) 2*[rectpulse(1,9)]’]; stem([0:1:22],a];

a) Error in the input of the y axis

b) A function whose step size increases to 1 at t=5 and to 2 at t=15

c) A function whose step size increases to 1 at t=4 and to 2 at t=14

d) Error in the input of the x axis

9. What is the output of the following code?

[l,m]=deconv([4 6 8],[2 3 4])

a) l=2,m=0

b) m=2,l=0

c) l=m=2

d) Error

10. What is the output of the following code?

stem([0:1:19],[zeros(1,5) [rectpulse(1,5)] zeros(1,5) 2*[rectpulse(1,5)]])

a) Error in the input of the y axis

b) A function whose step size increases to 1 at t=5 and to 2 at t=15

c) A function whose step size increases to 1 at t=4 and to 2 at t=14

d) Syntactical Error

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