Free Printable Signal and System

1.

From the given set of signals identify the periodic signal

a)

b)

c)

none

2.

a)

Time delay

b)

Time advance

c)

Amplitude shift

d)

Time fold

3.

y(n,k)= y( n-k)

a)

Timeinvariant

b)

Time variant

c)

Linear

d)

Non- Linear

4.

Output depends on present input only. The system is

a)

Dyanamic and causal

b)

Static and non causal

c)

Non causal

d)

Static and causal

5.

Most of periodic signals are

a)

Energy signal

b)

Power signal

c)

Odd signal

d)

Even signal

6.

A signalwhich can be completely represented by mathematical equation is

a)

Random signal

b)

Deterministic signal

c)

Energy signal

d)

Evensignal

7.

Graphical representation of a signal in time domain is called

a)

Frequency Spectrum

b)

Frequency

c)

Waveform

d)

None of the above

8.

The signal which is defined only at origin i.e only at t=0 is

a)

unit step signal

b)

impulse signal

c)

exponential signal

d)

ramp signal

9.

y[n]=x[n²] is an

a)

Time variant system

b)

Time invariant system

c)

None of the above

10.

y[n]=x[n]+3x[n+4] is

a)

causal system

b)

non causal system

11.

The power of a signal x[n] is defined as:

a)

$P=\lim_{N\rightarrow\infty\ }\ \frac{1}{1+2N}\sum_{n=-N}^N\left|x\left(n\right)\right|^2$

b)

$P=\lim_{N\rightarrow\infty}\ \frac{1}{1-2N}\sum_{n=-N}^N\left|x\left[n\right]\right|^2$

c)

$P=\lim_{N\rightarrow0}\ \frac{1}{1-2N}\sum_{n=-N}^N\left|x\left[n\right]\right|^2$

d)

$P=\lim_{N\rightarrow n}\ \frac{1}{2N+1}\sum_{-N}^N\left|x\left[n^2\right]\right|$

12.

x(n)=(0.5)ⁿu(n) is_____ and ____

a)

causal and unstable

b)

anticausal and unstable

c)

causal and stable

d)

anticausal and stable

13.

x(t)=cos(200Πt) what is the maximum frequency?

a)

50Hz

b)

100Hz

c)

200Hz

d)

400Hz

14.

What is the angular frequency and unit of f(t)=3sin(50t) ?

a)

50 radian/sec

b)

100 radian/sec

c)

25 radian/sec

d)

None

15.

x(n) is sampled by 500Hz, then what is the maximum frequency of x(n)

a)

100Hz

b)

250Hz

c)

1000Hz

d)

500Hz

Signal and System

Total questions: 15

Worksheet time: 8mins

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