Prateek nas module 1

1

Network Analysis and Synthesis

By:

Prateek Saxena

Asst Professor

ECE Department

RVIT College, Bijnor

R.V. INSTITUTE OF TECHNOLOGYApproved by UGC & AICTE New Delhi, Affiliated to UPTU & BTE Lucknow

2

MODULE-I


1. Basics of Networks related terms

2. Different types of Signal and

Systems

3

QUESTION-1

In Linear circuit ,when the ac is doubled ,the ac output becomes

a. one-fourth

b. Half

c. Two times

d. Four times


4

Answer- C


5

QUESTION-2

A network is said to be linear if and only if

a. A response is proportional to the excitation function

b. The principle of superposition applies

c. The principle of homogeneity applied

d. Both the principle (ii) and (iii) apply


6

Answer - D


7

QUESTION-3

The elements which are not capable of delivering energy by

their own are known as

a. Unilateral elements

b. Non-linear elements

c. Passive elements

d. Active elements


8

Answer - C


9

QUESTION-4

A component that opposes the change in circuit voltage is

a. Resistance

b. Capacitance

c. Inductance

d. conductance


10

Answer- B


11

QUESTION-5

An excitation is applied to a system at t=T and its response

is zero for -∞ < t < T . Such a system is a/an

a. non-causal system

b. Stable system

c. Causal system

d. Unstable system


12

Answer- C


13

QUESTION-6

The V-I characteristic of an element is shown below .The element is v

i

a. non-linear,active,non-bilateral

b. Linear,active,non-bilateral

c. Non-linear,passive,non-bilateral

d. Non-linear,active,bilateral


14

Answer-B


15

QUESTION-7

For a DC voltage an Inductor

a. Is virtually a short circuit

b. Is an open circuit

c. Depends on polarity

d. Depends on voltage value


16

Answer- A



QUESTION -8

Which signal can have infinite number of values in a range

a) Analog

b) Digital

c) a or b

d) None of the above


Answer-A


QUESTION -9

If the energy is supplied from a source ,whose resistance is 1

ohm to a load of 100 ohm the source will be

a) A voltage source

b) A current source

c) Both of the above



Answer -A

21

QUESTION-10

A circuit having an emf source or any energy source is/an

a. Active circuit

b. Passive circuit

c. Unilateral circuit

d. Bilateral circuit


22

Answer - A


23

QUESTION-11

A network N is a dual network N if

a. Both of them have same mesh equation

b. Both of them have same node equation

c. Mesh equation of one of them are node equation of other

d. None of the above


24

Answer- C


25

QUESTION-12

What is the function of ramp signal at t >∞

a. 1

b. kt

c. 0

d. k


26

Answer- B


27

QUESTION-13

Impulse signal function is also known as

a. Delta function

b. Dirac delta function

c. Delta dirac function

d. Both (a) and (b)


28

Answer- D


29

QUESTION-14

The output y(t) and the input x(t) of a system are related by

the equation y(t)= mx(t)+c, where m and c are constants. The

system is

a. Linear

b. Non-linear

c. May be linear or non –linear depending on y(t) and x(t)



30

Answer- B


31

QUESTION-15

The internal impedance of ideal current source is

a. Zero

b. Infinite

c. Both (i) and (ii)



32

Answer- B


33

QUESTION-16

An ideal voltage source charge an ideal capacitor

a. In infinite time

b. Exponentially

c. Instantaneously



34

Answer- C


35

QUESTION-17

There are two wires A and B . A is 20 times longer than B

and has half the cross section of that of B . If the resistance

of B is 1Ω,the resistance of A will be

a. 40Ω

b. 1/40Ω

c. 20 Ω

d. 10 Ω


36

Answer- A


37

One coulomb charge is equal to the charge on

(a) 6.24 x 10^-18 electrons

(b) 6.24 x 10^24 electrons

(c) 6.24 x 10^18 atoms

(d) 6.24 X 10 ^ -24

QUESTION-18


Answer-A


QUESTION-19

Energy stored in a Capacitor is

a) ¼ CV^2

b) 1/2CV^2

c) 0

d)0

1/ 2C


Answer-B


QUESTION-20

Two resistors R1 and R2 give combined resistance of 4.5Ω when

in series and 1Ω when in parallel. The resistance are

a) 2Ω and 2.5Ω

b) 1Ω and 3.5Ω

c) 1.5Ω and 3.5Ω

d) 4Ω and 0.5Ω


Answer- C


QUESTION-21

Which mathematical notation specifies the condition of

periodicity for a continuous time signal

a) X(t) = x(t+To)

b) X(n) = x(n+No)

c) X(t) = e^-at



Answer-A



QUESTION -22

Which signals can have only a limited number of values

a) Analog

b) Digital

c) A or b



Answer-B

QUESTION-23

Damped sinusoids are

a) Sinusoid signals multiplied by growing exponents

b) Sinusoid signals divided by growing exponentials

c) Sinusoid signals multiplied by decaying exponentials

d) Sinusoid signals divided by decaying exponentials


Answer- C



QUESTION -24

For which channel we need to use the shanon capacity to find

the maximum bit rate

a) Noisy

b) Noiseless

c) Bandpass

d) Low pass


Answer-A

QUESTION-25

A system is said to be shift invariant only if

a) A shift in the input signal also results in the corresponding shift in the

output

b) A shift in the input signal does not exhibit the corresponding shift in the

output

c) A shifting level does not vary in an input as well as output

d) A shifting at input does not affect the output


Answer-A


QUESTION-26

Under which condition does an initially relaxed system

become unstable

a) Only if bounded inputs generate unbounded output

b) Only if bounded inputs generate bounded output

c) Only if unbounded input generates unbounded output

d) Onlu if unbounded input generates bounded output

e)


Answer- A


QUESTION-27

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)

a) 1&3

b) 2&4

c) 1,3&4

d) All of the above


Answer-D


QUESTION-28

An equalizer used to compensate the distortion in the

communication system by faithful recovery of an original

signal is nothing but an illustration of

a) Static system

b) Dynamic system

c) Invertible system



Answer-C


QUESTION-29

The graphical representation of a signal in the time domain is known

as

a) Frequency

b) Waveform

c) Frequency response




Answer-A


A random signal is a signal which

a) Has uncertainity

b) Has no uncertainity

c) Is a completely specified function of time


QUESTION -30


QUESTION -31

………….. Data have discrete states and take discrete value

Analog

Digital

a or b

None of the above


Answer-B

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QUESTION-32

The V-I characteristic of a resistor is i=2v^2. The resistor is

a. Linear , passive, bilateral

b. Non-linear , passive , bilateral

c. Non-linear , active , bilateral

d. Non-linear , active ,unilateral


65

Answer- B


QUESTION-33

Which property of delta function indicates the equality between

the area under the product of function with shifted impulse and the

value of function located at unit impulse instant

a) Replication

b) Sampling

c) Scaling

d) Product


Answer-B



QUESTION -34

Frequency and periods are

a) Inverse of each other

b) Proportional to each other

c) The same



Answer-A


QUESTION -35

What is the rate of change with respect to time

a) Amplitude

b) Time

c) Frequency

d) voltage


Answer-C


QUESTION -36

Which of the following describe the position of the

waveform relative to time 0

a) Frequency

b) Phase

c) Amplitude

d) Voltage


Answer-B


QUESTION -37

A sine wave in the …………. Domain can be represent by one

signal spike in the …………. domain

a) Time:frequency

b) Frequency:time

c) Time:phase

d) Phase :time


Answer-A


QUESTION -38

A……sine wave is not useful in data communication; we

need to send a … signal

a) Composite ; single-frequency

b) Single ; frequency-composite

c) Single-frequency; double-frequency



Answer-B


QUESTION -39

The …………. Of a composite signal is the difference between the

highest and the lowest frequencies contained in that signal

a) Frequency

b) Period

c) Bandwidth

d) Amplitude


Answer-C


Baseband transmission of a digital signal is possible only if we

have a …………channel

QUESTION -40

a) Low pass

b) Bandpass

c) Low rate

d) High rate


Answer-A


QUESTION -41

If the available channel is a …………. Channel ,we cannot send

a digital signal directly to the channel

a) Low pass

b) Band pass

c) Low rate

d) High rate


Answer-B


QUESTION -42

For a ………….. Channel , the nyquist bit rate formula defines

the theoretical bit rate .

a) Noisy

b) Noiseless

c) Bandpass

d) Low pass


Answer-B

QUESTION-43

An amplitude of sinc function that passes through zero at

multiple values of an independent variable ‘x’

a) Decrease with an increase in the magnitude of an independent variable (x)

b) Increase with an increase in the magnitude of an independent variable(x)

c) Always remain constant irrespective of variation in magnitude of ‘x’

d) Cannot be define


Answer-A



QUESTION -44

The following product defines the number of bit that can fill the link

a) Bandwidth - period

b) Frequency-amplitude

c) Bandwidth - delay

d) Delay-amplitude


Answer- C


QUESTION -45

The circuits whose properties are same in either direction is known

as

a) Unilateral circuit

b) Bilateral circuit

c) Irreversible circuit

d) Reversible circuit


Answer- B


QUESTION -46

Which of the following is not a non linear element

a) Gas diode

b) Heater coil

c) Tunnel diode

d) Electric arc


Answer-


QUESTION -47

Which of the following is the passive element

a) Capacitance

b) Ideal current source

c) Ideal voltage source

d) All of the above


Answer- C


QUESTION -48

Which of the following is a bilateral element

a) Constant current source

b) Constant voltage source

c) Capacitance



Answer- C


QUESTION -49

The circuit has resistors ,capacitors and semi-conductor diodes . The

circuit will be known as

a) Non linear circuit

b) Linear circuit

c) Bilateral circuit



Answer - A

100

QUESTION-50

Which of the following represent a stable system?

a. Impulse response of the system decrease exponentially

b. Area within the impulse response is finite

c. Eigen values of the systems are positive and real

d. Roots of the characteristic equations of the system are real and

negative


101

Answer- B



Thank you

&

All The Best

Prateek nas module 1

Engineering