# Operations on Signals – 1 MCQ’s

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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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