Free Printable SS - Revision 1

1.

Graphical representation of a signal in time domain is called

a)

Frequency Spectrum

b)

Frequency

c)

Waveform

d)

None of the above

2.

$u\left(t-a\right)\ =\ 0,\ \ if$

a)

$t-a\ =\ 0$

b)

$t\ -\ a\ <0$

c)

$t\ -\ a>0$

d)

$t\ >a$

3.

$\int_{-\infty}^{\infty}\ \left(t-2\right)^2\delta\left(t-2\right)dt$

a)

$4$

b)

$2$

c)

$\left(t-2\right)$

d)

$0$

4.

$\delta\left(at\right)\ =$

a)

$\delta\left(t\right)$

b)

$\left|a\right|\delta\left(t\right)$

c)

$\frac{1}{\left|a\right|}\delta\left(t\right)$

d)

None of the above

5.

A deterministic signal has

a)

no uncertainty

b)

uncertainty

c)

partial uncertainty

d)

none of the above

6.

The sum of two periodic signals is periodic only if the ratio of their respective periods is

a)

a rational number

b)

an irrational number

c)

a complex number

d)

a real number

7.

A signal is an energy signal if

a)

$E\ =0,\ P=0$

b)

$E\ =\infty,\ P\ =\ finite$

c)

$E\ =\ finite,\ P\ =\ 0$

d)

$E\ =\ finite,\ P\ =\ \infty$

8.

$The\ signal\ x\left(t\right)=A\ \sin\left(\omega_{o\ }t+\phi\right)\ is$

a)

a power signal

b)

an energy signal

c)

periodic signal

d)

both periodic and power signal

9.

$x\left(t\right)=r\left(t\right)\ -r\left(t-2\right)\ is\ a\$

a)

power signal

b)

energy signal

c)

nor power nor energy

d)

both energy and power

10.

The image shows a/an _______________ signal.

a)

Unit step

b)

Unit impulse

c)

Unit pulse

d)

Exponential

11.

Continuous time signals are expressed using:

a)

round brackets enclosing the time variable 'n' or 'k'

b)

square brackets enclosing the time variable 'n' or 'k'

c)

round brackets enclosing the time variable 't' or 'τ'

d)

square brackets enclosing the time variable 't' or 'τ'

12.

The following are approaches to carry out linear continuous time convolution except:

a)

Mathematical approach

b)

Graphical approach

c)

Convolution table approach

d)

Numerical evaluation approach

13.

The signal shown is expressed as:

a)

u[t-1]

b)

δ[n-2]

c)

u(t-2)

d)

δ(n-1)

14.

Which statement is correct?

a)

An energy signal will have infinite power content.

b)

A power signal will have zero energy content.

c)

A signal must be either energy or power signal.

d)

An energy signal will have zero power content.

15.

The formulae shown below describes which operation?

a)

Linear convolution

b)

Discrete time convolution

c)

Convolution sum

d)

Approximation of signals using unit impulse train

16.

Which of the following is not a property of linear convolution?

a)

Distributive

b)

Associative

c)

Integrative

d)

Commutative

17.

Arrange the following steps for graphical evaluation of linear convolution in the correct sequence:

I. Plot the two signals

II. Multiply and find the area under the signals

III. Flip one of the signals and shift by t units.

IV. Plot the convolution result as a function of t.

V. Repeat for different values of t.

a)

II, IV, V, I, III.

b)

I, III, II, V, IV.

c)

I, II, III, V, IV.

d)

I, III, V, III, IV.

18.

Which signal below can be categorised as a stochastic signal?

a)

Sinusoidal signal

b)

Cosine signal

c)

Performance of a stock market on a particular day

d)

Unit step signal

19.

What is meant by a 'unit impulse response'?

a)

The output of an LTI system when the input is a unit impulse signal.

b)

The input of an LTI system when the output is a unit impulse signal.

c)

The output of an LTI system when the input is a unit step signal.

d)

The input of an LTI system when the output is a unit step signal.

20.

Choose the static system of the DT signal

a)

$y\left(n\right)=x\left(n\right)+5\ x\left(n\right)$

b)

$y\left(n\right)\ =\ x\left(n\right)+0.5\ x\left(n-1\right)$

c)

$y\left(n\right)\ =\ x\left(n-1\right)+0.5x\left(n-1\right)$

d)

$y\left(n\right)\ =\ x\left(n\right)+0.5x\left(n+1\right)$

21.

When we call the system is time invariant system?

a)

depends not only on the input sample at the same time, but also on past inputs

b)

depends only on the input sample at the same time. Not on past input samples

c)

its input-output characteristics do not change with time.

d)

its input-output characteristics are affected by time.

22.

choose the following mathematical equations below are time variant?

a)

$y\left(n\right)\ =\ x\left(-n\right)$

b)

$y\left(n\right)\ =\ x\left(n\right)\cos\ \omega n$

c)

$y\left(n\right)\ =\ x\left(n^2\right)$

d)

$y\left(n\right)\ =\ x\left(n+1\right)$

23.

Which following is not true about linear system?

a)

combination of the input sequences are equal to the linear combination of the output sequences.

b)

If the output y(n, k) = y(n – k) for all possible values of k

c)

A relaxed system with zero input will produce zero output

d)

system is one that satisfies the superposition principle.

24.

Select the following below whether the equations is non-causal?

a)

$y\left(n\right)=x\left(n\right)$

b)

$y\left(n\right)\ =\ x\left(n\right)+x\left(n-1\right)$

c)

$y\left(n\right)=x\left(n\right)+x\left(n+1\right)$

d)

$y\left(n\right)\ =\ x\left(n\right)+x\left(n-1\right)+y\left(n-1\right)$

25.

What is the temperature of this fire?

a)

continuous

b)

discrete

26.

How long does the bus to Birchington take?

a)

continuous

b)

discrete

27.

How many goals have you scored this year?

a)

continuous

b)

discrete

28.

How much does a Mars Bar cost?

a)

continuous

b)

discrete

29.

How much does a whale weigh?

a)

continuous

b)

discrete

30.

What is your shoe size?

a)

continuous

b)

discrete

SS - Revision 1

Total questions: 30

Worksheet time: 18mins

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