prateek nas module 3 30-dec-15

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-2


1. Networks theorm

3

QUESTION-1

Superposition theorem can be applied only to circuits having

a. resistive element

b. passive element

c. non-linear element

d. linear bilateral elements


4

Answer- D


5

QUESTION-2

If all the elements in a particular network are linear then the

superposition theorems holds when the excitation is

a. DC only

b. AC only

c. Either AC or DC

d. An impulse


6

Answer - C


7

QUESTION-3

Which of the following theorems is applicable for both linear

and non-linear circuits

a. Superposition

b. Thevenin

c. Norton

d. None of these


8

Answer - D


9

QUESTION-4

The concept on which superposition theorem is based

a. Reciprocity

b. duality

c. non-linearity

d. linearity


10

Answer- D


11

QUESTION-5

Thevenin’s theorem can be applied to calculate the current in

a. Any load

b. A passive load only

c. A linear load only

d. A bilateral load only


12

Answer- C


13

QUESTION-6

When determining Thevenin’s resistance of a circuit

(a) all sources must be open circuited

(b) all sources must be short circuited

(c) all voltage sources must be open circuited and all current

sources must be short circuited

(d) all sources must be replaced by their internal resistances


14

Answer-D


15

QUESTION-7

Which one of he following theorems is a manifestation of the

law of conservation of energy

a. Tellegen’s theorem

b. Reciprocity theorem

c. Thevenin’s theorem

d. Norton’ theorem


16

Answer- A


17

QUESTION-8

Tellegen’s theorem is applicable to

a. Circuit having passive element

b. Circuits having time –invariant elements only

c. Circuits with linear elements only

d. Circuits with active or passive, linear or non-linear

and time –in variantor time –varying elements


18

Answer-D


19

QUESTION-9

Millman’s theorem yields

a. Equivalents voltage source

b. Equivalent voltage or current source

c. Equivalent resistance

d. Equivalent impedance


20

Answer-B


21

QUESTION-10

When a source is delivering maximum power to a load ,the

efficiency of the circuit

a. Is always 50%

b. Depends on the circuit

parameter

c. Is always 75%

d. None of these


22

Answer - A


23

QUESTION-11

Maximum power transfer occurs at a

a. 100% efficiency

b. 50% efficiency

c. 25% efficiency

d. 75% efficiency


24

Answer- B


25

QUESTION-12

Thevenin’s resistance Rth is found

a. by removing voltage source along with their

internal resistance

b. by short circuiting the given two terminal

c. between any two open terminal

d. between same open terminal as for Vth


26

Answer -D


27

QUESTION-13

Any number of current sources in parallel may be replaced by a single

current source whose current is the algebric sum of individual source

currents and source resistance is the parallel combination of the

individual sources resistance. Above statement is associated with

a. thevenin’s theorm

b. millman’s theorm

c. maximum power transfer theorm

d. none of the above


28

Answer- B


29

in any linear bilateral network, if a source of emf E in

any branch produce a current I in any other branch then

same emf in the second branch would produce same

current in the first branch

(a) Compensation theorem

(b) Superposition theorem

(c) Reciprocity theorem

(d) None of the above

QUESTION-14


30


Answer- C

31

QUESTION-15

For high efficiency of transfer of power, internal resistance of the

source should be

a. Equal the load resistance

b. less than the load resistance

c. more than the load resistance

d. none of the above


32

Answer- B


33

QUESTION-16

for the maximum transfer of power, internal resistance of the source

should be

a. equal the load resistance

b. less than the load resistance

c. Greater than the load resistance

d. None of the above


34

Answer- A


35

QUESTION-17

In a series parallel circuit, any two resistance in the same

current path must be in

a. series with each other

b. parallel with each other

c. Series with voltage source

d. Parallel with voltage source


36

Answer- A


37

Applications of Norton’s theorm to a circuit yields

(a) Equivalent current source and impedance in series

(b) Equivalent current source and impedance in parallel

(c) Equivalent impedance

(d) Equivalent current source

QUESTION-18


Answer-A


38

QUESTION-19

The superposition theorem is applicable to

a) Voltage only

b) Current only

c) Both current and voltage

d) Current voltage and power


39

Answer-D


40

QUESTION-20

The superposition theorem requires as many circuits to be solved

as there are

a) sources, nodes and meshes

b) Sources and nodes

c) sources

d) node


41

Answer- C


42

43

QUESTION-21

What would be the potential at point a

a. 15v

b. 30v

c. 5v

d. 10v


44

Answer -A


45

QUESTION-22

If we double the voltage source in above equation the Va would be

as compared to previous one

a. same

b. double

c. 4 times

d. None of the above


46

Answer- B


QUESTION-23

In the following circuit the value of Vth and Rth are

a) 2V , 4Ω

b) 4V , 4Ω

c) 4V , 5Ω

d) 2V , 5Ω


47

Answer-B


48

QUESTION-24

The reciprocity theorem is applicable to

a) Circuit with one independent sources

b) Circuits with only one independent sources and

no dependent sources

c) Circuits with any number of independent sources

d) Circuit with any number of sources


49

Answer-B


50

QUESTION-25

The substitution theorem applies to

a) Linear networks

b) Non linear networks

c) Linear time –invariant network

d) Any network


51

Answer-D


52

QUESTION-26

If a network has all linear elements except for a few non-linear

ones the superposition theorem

a) Cannot hold at all

b) Always hold

c) May hold on careful selection of element

values,sources waveform and response

d) Holds in case direct current excitation


53

Answer- A


54

QUESTION-27

a) 12V , 3/2Ω

b) 4V , 3/2Ω

c) 16/3V , 2/3 Ω

d) 16/3V , 3 Ω


55

What is the Thevenin’s equivalent between A and B for the circuit

shown

Answer-C


56

QUESTION-28

If a resistance of 10Ω is placed in parallel with the source, the

source current I will

a) increase

b) decrease

c) Remain same

d) none


57

Answer- A


58

QUESTION-29

What is the power dissipated in the R due to current source

a) 6W

b) 5W

c) 4W

d) 2W


59

Answer-D


60

QUESTION-30

The maximum power that can be distributed in the load in circuit

a) 0.396W

b) 6W

c) 6.75W

d) 13.5W


61

Answer-A


62

QUESTION-31

Find Vx from the given circuit

a) 42.2V

b) 83.3V

c) 97.3V

d) 103V


63


Answer- B

64


Superposition theorem is not applicable for

a) Voltage calculations

b) Bilateral elements

c) Power calculation

d) Passive elements

QUESTION -32

65


ANSWER- C

66


QUESTION -33

Which of the following statement is true

a) A Norton’s equivalent is a series circuit

b) A Thevenin’s equivalent circuit is parallel circuit

c) R-L circuit is a dual pair

d) L-C circuit is dual pair

67


Answer-D

68


QUESTION -34

In any lumped network with elements in b branches ,

For all t ,holds good according to

a) Norton’s theorem

b) Thevenin’s theorem

c) Millman’s theorem

d) Tellegen’s theorem

69

1

( ). ( ) 0b

k k

k

v t i t


Answer-D

70


QUESTION -35

Thevenin’s theorem can be applied to calculate the current in

a) Any load

b) a passive load only

c) A linear load only

d) A bilateral load only

71


Answer-A

72


QUESTION -36

The subsitution theorem is applicable for a network which has

a) Linear networks

b) Non linear networks

c) Linear time-invariant network

d) Any network

73


Answer-D

74


QUESTION -37

The subsituition theorem is applicable for a network which has

a) A unique solution

b) One or two non linear elements

c) One non linear or time varying element

Choose the correct combination

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a) 1 and 2

b) 1 and 3

c) 2 and 3

d) 1 ,2 and 3


Answer-B

76


QUESTION -38

The reciprocity theorem is applicable to a network

i) Which contains R,L,C as element

ii) Which is initially a relaxed system

iii) Which has both dependent and independent sources

a) 1 and 2

b) 1 and 3

c) 2 and 3

d) 1,2 and 3 77


Answer-A

78


QUESTION -39

What are the fundamental rules for network analysis

a) Ohm’s law

b) Kirchoff ‘s law

c) Law of conservation of energy

d) Both a) and b)

79


Answer-D

80


QUESTION -40

Supermesh concept is only for

a) Current sources

b) Voltage sources

c) Dependent sources

d) None of the above

81


Answer-A

82


QUESTION -41

Ohm law mathematical statement given as

a) V=IR

b) V=I/R

c) R=V/I

d) None of the above

83


Answer-A

84


Ohms law not applicable to

QUESTION -42

a) Linear circuits

b) Non linear circuits

c) No limitation

85


Answer-B

86


QUESTION -43

KVL is …………… of nature of circuit element

a) dependent

b) independent

c) In other way

d) Time varying

87


Answer-B

88


QUESTION -44

If an impedance ZL is connected across a voltage source V with

source impedance ZS’ then for maximum power transfer, the load

impedance must be equal to

(a) source impedance ZS

(b) complex conjugate of ZS

(c) real part of ZS

(d) imaginary part of ZS

89


Answer-B

90


QUESTION -45

In a practical voltage source, the terminal voltage

(a) cannot be less than source voltage

(b) cannot be higher than source voltage

(c) is always less than source voltage

(d) is always equal to source voltage

91


Answer-

92


QUESTION -46

What are the limitation of Reciprocity theorem

a) Not applicable to a network consisting of any

dependent source if any linear

b) Not applicable to a network consisting of any time

varying element

c) Not applicable to a network consisting of non

linear element like diode,transistor etc

d) All of the above 93


Answer- D

94


QUESTION -47

What are the limitation of Thevenin’s theorem

a) Not applicable to the circuit consisting of

unilateral element like diode

b) Bilateral element

c) Linear elements

d) All of the above

95


Answer- A

96


QUESTION -48

What are the limitation of Norton’s theorem

a) Not applicable to the circuit consisting of load

series or parallel with controlled or dependent

sources

b) independent

c) In other way

d) Time varying97


Answer- A

98


QUESTION -49

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

99


Answer- B

100


QUESTION -50

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) Product101


Answer- B

102


Thank you

&

All The Best

prateek nas module 3 30-dec-15

Engineering