# Operations on Signals – 1 MCQ’s

This set of MATLAB Multiple Choice Questions & Answers (MCQs) focuses on “Operations on Signals – 1″.

1. What is the following graph if u(t) denotes step function and r(t) denotes ramp function?

a) r(t)

b) r(t)-r(t-50)-u(t-50)

c) r(t)-r(t-50)

d) r(t)-u(t-50)

2. What is the following graph if u(t) denotes step function?

a) u(t+0)

b) u(t)-u(t-1000)

c) u(t-0)

d) u(t)

3. What is the following graph, if del(t) represents the impulse function?

a) del(t)

b) del(t-100)

c) del(t+100)

d) del(t-50)

4. What does the following code generate?

p=ones(1,90); t=(0:1:89); plot(t,p);

a) A graph of a unit step function

b) A graph of a pulse function

c) A graph of a triangular pulse function

d) An impulse function

5. What is the output of the following code?

a=[1 2 3]; b=2; a.\b;

a) .5 1 1.5

b) 2 1 .67

c) Error

d) Cannot be determined

6. The convolution of [1 2 1] and [1 2 1] will have the highest amplitude at t= _________

a) 3 units

b) 0 units

c) 1 unit

d) 2 units

7. What is the output of the following code?

a=[1 2 3]; b=2; conv(a,b)

a) 2 4 6

b) 1 2 3

c) 0 0 0

d) 2 3 1

8. What is the output of the following code?

Y=rectpulse(1,9); t=0:1:8; plot(t,y);

a) A rectangular pulse extending from 0 to 8 units in time

b) A rectangular pulse with increasing amplitude

c) Error

d) Cannot be determined

9. What is the output of the following code?

T=0:1:9; stem(T);

a) A ramp function

b) r[n]-r[n-9]-9u[n-9]

c) r[n]-r[n-9]

d) Error

10. What is the output of the following code?

Y=rectpulse(1,9); p=y’; t=0:1:9; plot(t,p);

a) u(t)-u(t-9)

b) u(t) till 9 units in time

c) Error

d) Cannot be determined

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