Free Printable EC 8352 SIGNALS AND SYSTEMS

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EC 8352 SIGNALS AND SYSTEMS

Total questions: 50

Worksheet time: 50mins

Name

Class

Date

In an analog signal , both the magnitude of the signal and the independent variable are continuous

True

False

The sinusoidal and complex exponential signals are always periodic

True

False

When the energy of a signal is finite then the power will be finite

True

False

When the power of a signal is finite then the energy will be zero

True

False

Which of the following is not an example of signal

Blood Pressure

temperatre

aircraft

speech

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

unit step signal

impulse signal

exponential signal

ramp signal

All continuous time sine,cosine and exponential signals are always periodic
All Discrete time sine,cosine and exponential signals are always periodic

Both statements are correct

Both statements are wrong

statement 1 is correct, statement 2 is wrong

statement 1 is wrong, statement 1 is correct

The signal defined by x(t)= x(-t) is

Periodic

aperiodic

even

odd

A signal defined by x(t+T) = x(t) is said to be

Even signal

Power signal

Periodic signal

aperoidic signal

10.

A signal is said to be power signal if its power is

zero

one

finite

infinite

11.

A signal is said to be energy energy if its energy is

zero

one

finite

infinite

12.

Which mathematical notation specifies the condition of periodicity for a continuous time signal?

x(t) = x(t +T₀)

x(n) = x(n+ N)

x(t) = e^-αt

None of the above

13.

Determine the odd component of the signal: x(t)=cost+sint.

sint

2sint

cost

2cost

14.

For an energy signal __________

E=0

P= ∞

E= ∞

P=0

15.

Determine the power of the signal: x(t) = cos(t).

1/2

3/2

16.

Discrete time signal is derived from continuous time signal by _____________ process.

Addition

Multiplying

Sampling

Addition and multiplication

17.

If x (-t) = -x (t) then the signal is said to be _____________

Even signal

Odd signal

Periodic signal

Non periodic signal

18.

When x(t ) is said to be non periodic signal?

If the equation x (t) = x (t + T) is satisfied for all values of T

If the equation x (t) = x (t + T) is satisfied for only one value of T

If the equation x (t) = x (t + T) is satisfied for no values of T

If the equation x (t) = x (t + T) is satisfied for only odd values of T

19.

Energy signal has zero average power and power signal has zero energy.

True

False

20.

Unit Step function is defined by

u(n) = 1, n ≥ 0

= 0, n < 0

u(n) = 1, n = 0

= 0, n ≠ 1

u(n) = 1, n ≤ 0

= 0, n ≠ 1

u(n) = 1, n ≤ 0

= 0, n ≥ 1

21.

Which one of the following systems is causal?

y(t) = x(t) + x(t-3) + x(t²)

y[n] = x[n+2]

y(t)=x(t-1)+x(t-2)

y[n] = x[2n²]

22.

Which among the following is a Time Invariant system?

dy(t)/dt + ty(t) = x(t)

y(t) = x(t) cosπt

y[n] = x[n] + n x[n-1]

y[n] = x³ [n+1]

23.

This signal is a continuous signal

Analog

Digital

24.

The image provided is a _________ signal.

Analog

Digital

25.

The image provided is a _________ signal.

Analog

Digital

26.

Identify the image of an ANALOG signal with NOISE

27.

Identify the image of an DIGITAL signal with NOISE

28.

A system is said to be defined as non causal, when

the output at the present depends on the input at an earlier time

the output at the present does not depend on the factor of time at all

the output at the present depends on the input at the current time

the output at the present depends on the input at a time instant in the future

29.

Which among the following are the stable discrete time systems? 1. y(n) = x(4n) 2. y(n) = x(-n) 3. y(n) = ax (n) + 8 4. y(n) = cos x(n)

1 & 3

2 & 4

1, 3 & 4

1,2,3 & 4

30.

Which one of the following systems described by the following input-output relations is non-linear ?

y(n) = n x(2n)

y(n) = x (n2)

y(n) = n2x(n)

y(n) = x2(n)

31.

A function of one more variables which conveys information on the nature of physical phenomenon is called

Noise

Interference

System

Signal

32.

Which one of the following is correct ? Energy of a power signal is

Finite

Zero

Infinite

Between 1 And 2

33.

If the response of a system to an input does not depend on the future values of the input.Then which one of the following is true for the system ?

It Is Aperiodic

It Is Causal

It Is Anticipator

It Is Discrete

34.

Causal systems are the systems in which

The output of the system depends on the present and the past inputs

The output of the system depends only on the present inputs

The output of the system depends only on the past inputs

The output of the system depends on the present input as well as the previous outputs

35.

find even and odd parts of x(n)={4,-2,4,-6,0}

{2,4,4,4,2},{2,2,0,2,2,}

{2,-4,4,-4,2},{2,2,0,2,2,}

{2,-4,4,-4,2},{2,2,0,-2,-2,}

{2,4,4,4,2},{2,2,0,-2,2,}

36.

check the following system for causality

1.y[n] = x[n] + 2x[n - 1] & 2. y[n] = x[n - k]

Both 1 &2

only 1

only 2

neither 1 nor 2

37.

verify linearity of the system y(t)=x(t)x(t-2)

linear

non linear

can't be determined

38.

Test the Time in-variance(TIV) of y(t)=x(n+2)-x(7-n)

TIV system

TV system

can't be determined

39.

Test the system y(n+1)+n*y(n)=4*x(n)

non linear,TV,Memory less

Linear, TIV, Static

linear,TIV, Memoryless

non linear,TV,Static

40.

Check whether the following system is Causal or not? y(t)=x(t) sint5t

causal

non causal

can't ne determined

41.

Check whether the given system is static or dynamic? y(t)=3 x(t)+5

Static

Dynamic

can't be determined

42.

Which among the following are the stable discrete time systems?

1.y(n) = x(4n)

2. y(n) = x(-n)

3. y(n) = ax(n) + 8

4. y(n) = cos x(n)

1 & 3

2 & 4

1, 3 & 4

1, 2, 3 & 4

43.

Which of the following systems is linear?

y(t) = sin(x(t))

y(t) = log(x(t))

y(t) = cos(x(t))

y(t) = dx(t)/dt

44.

The fundamental period of the signal X (t) = $10\cos^2\left(10\pi t\right)$ is __________

0.2

0.1

0.5

No fundamental period exists

45.

Which of the following statements are false?

the product of two odd signal is an odd signal

the product of two even signals is an even signal

the product of even and odd signal is even signal

the product of even and odd is signal is an odd signal

46.

The differentiation of a unit step signal is

Ramp Signal

impulse signal

exponential signal

parabolic signal

47.

The integral of a unit impulse signal is

infinity

zeros

one

constant

48.

The system y(n)=sinx(n) is

Stable

Unstable

BIBO stable

None of the above

49.

The discrete time system y(n)=x(n-3)-4x(n-10) is a,

Dynamic system

Memoryless System

Time varying system

None of the above

50.

Shifting a signal to left is called delay and shifting to right is called advance

True

False

100 %

EC 8352 SIGNALS AND SYSTEMS

Total questions: 50

Worksheet time: 50mins

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