Code.No: 21117

SET-1

RR

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD I .B.TECH SUPPLEMENTARY EXAMINATIONS FEBRUARY - 2010 NETWORK THEORY (COMMON TO EEE, ECE, CSE, EIE, BME, IT, E.CON.E, CSS, ETM, ECC, ICE) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --Obtain the expressions for star-delta equivalence of resistive networks Determine the voltage appearing across terminals y-z if a d.c. voltage of 100V is applied across x-y terminals in the figure. [6+10]

2.a)

Define self inductance, mutual inductance and coefficient of coupling. Derive the relation connecting the above quantities. Determine the coefficient of coupling K for the magnetically coupled coils if the power dissipated in 10 ohms resistance is 40W. {As shown in the Figure}. [8+8]

nt

uW

b)

or

ld .

in

1.a) b)

3.a)

Aj

b)

A series R - C circuit is excited by sinusoidal voltage I=Im sin wt. Find the expression for impedance using phasor diagram. Determine the supply voltage and the power factor in the following network if the total power delivered is 200 W. [6+10]

5.a)

b)

6.a)

b)

Define the following: i) Oriented graph ii) Tree of a graph iii) Cut set and a Basic Cut set iv) Tieset & Basic Tieset. For the topological graph shown in the figure, obtain the fundamental Tie set matrix choosing the tree containing two elements 5 & 6. Derive expression for elements of m-derived low pass T filter in terms of proto type T network. [4+4+8]

State and explain the Norton’s theorem. Use Thevenins theorem to find the power consumed in (5 + j5) Ω impedance in the network shown in figure. [6+10]

Aj

nt

7.a) b)

uW

or

c)

A balanced delta connected load having impedances of values 20 ∠ -600 ohms each and a balanced star connected load having impedance of value 10 ∠ 300 each are supplied by the same 3 phase 400V, with phase sequence ABC. Obtain the line currents. Derive the relationship between line and phase quantities in a balanced delta connected system, with the help of phasor diagram. [8+8]

in

b)

In a series RLC circuit R = 1k Ω L = 100mH and C=12pF. If a voltage of 200V is applied to the combination. Find, i) Resonance frequency ii) Q-factor iii) Bandwidth iv) Voltage across L and C. Derive the expression for impedance parameters in terms of h-parameters for a two port network. [8+8]

ld .

4.a)

8.a) Derive the expression for i(t) for R - L series circuit when excited by a sinusoidal source. b) For R - L - C series circuit with R = 10 Ω , L = 0.2 H, C = 50 micro farads, determine the current i(t) when the switch is closed at t = 0. Applied voltage is V(t) = 100 Cos (1000 t + 60)0. [8+8] *****

Code.No: 21117

SET-2

RR

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD I .B.TECH SUPPLEMENTARY EXAMINATIONS FEBRUARY - 2010 NETWORK THEORY (COMMON TO EEE, ECE, CSE, EIE, BME, IT, E.CON.E, CSS, ETM, ECC, ICE) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks ---

b) 3.a)

b)

in

In a series RLC circuit R = 1k Ω L = 100mH and C=12pF. If a voltage of 200V is applied to the combination. Find, i) Resonance frequency ii) Q-factor iii) Bandwidth iv) Voltage across L and C. Derive the expression for impedance parameters in terms of h-parameters for a two port network. [8+8]

A balanced delta connected load having impedances of values 20 ∠ -600 ohms each and a balanced star connected load having impedance of value 10 ∠ 300 each are supplied by the same 3 phase 400V, with phase sequence ABC. Obtain the line currents. Derive the relationship between line and phase quantities in a balanced delta connected system, with the help of phasor diagram. [8+8] Define the following: i) Oriented graph ii) Tree of a graph iii) Cut set and a Basic Cut set iv) Tieset & Basic Tieset. For the topological graph shown in the figure, obtain the fundamental Tie set matrix choosing the tree containing two elements 5 & 6. Derive expression for elements of m-derived low pass T filter in terms of proto type T network. [4+4+8]

nt

4.a)

ld .

2.a)

or

b)

A series R - C circuit is excited by sinusoidal voltage I=Im sin wt. Find the expression for impedance using phasor diagram. Determine the supply voltage and the power factor in the following network if the total power delivered is 200 W. [6+10]

uW

1.a)

b)

Aj

c)

State and explain the Norton’s theorem. Use Thevenins theorem to find the power consumed in (5 + j5) Ω impedance in the network shown in figure. [6+10]

6.a)

Derive the expression for i(t) for R - L series circuit when excited by a sinusoidal source. For R - L - C series circuit with R = 10 Ω , L = 0.2 H, C = 50 micro farads, determine the current i(t) when the switch is closed at t = 0. Applied voltage is V(t) = 100 Cos (1000 t + 60)0. [8+8]

ld .

b)

in

5.a) b)

Obtain the expressions for star-delta equivalence of resistive networks Determine the voltage appearing across terminals y-z if a d.c. voltage of 100V is applied across x-y terminals in the figure. [6+10]

8.a)

Define self inductance, mutual inductance and coefficient of coupling. Derive the relation connecting the above quantities. Determine the coefficient of coupling K for the magnetically coupled coils if the power dissipated in 10 ohms resistance is 40W. {As shown in the Figure}. [8+8]

Aj

nt

b)

uW

or

7.a) b)

*****

Code.No: 21117

SET-3

RR

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD I .B.TECH SUPPLEMENTARY EXAMINATIONS FEBRUARY - 2010 NETWORK THEORY (COMMON TO EEE, ECE, CSE, EIE, BME, IT, E.CON.E, CSS, ETM, ECC, ICE) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks ---

2.a)

b)

Define the following: i) Oriented graph ii) Tree of a graph iii) Cut set and a Basic Cut set iv) Tieset & Basic Tieset. For the topological graph shown in the figure, obtain the fundamental Tie set matrix choosing the tree containing two elements 5 & 6. Derive expression for elements of m-derived low pass T filter in terms of proto type T network. [4+4+8]

State and explain the Norton’s theorem. Use Thevenins theorem to find the power consumed in (5 + j5) Ω impedance in the network shown in figure. [6+10]

Aj

nt

3.a) b)

uW

or

c)

in

b)

A balanced delta connected load having impedances of values 20 ∠ -600 ohms each and a balanced star connected load having impedance of value 10 ∠ 300 each are supplied by the same 3 phase 400V, with phase sequence ABC. Obtain the line currents. Derive the relationship between line and phase quantities in a balanced delta connected system, with the help of phasor diagram. [8+8]

ld .

1.a)

4.a)

b)

Derive the expression for i(t) for R - L series circuit when excited by a sinusoidal source. For R - L - C series circuit with R = 10 Ω , L = 0.2 H, C = 50 micro farads, determine the current i(t) when the switch is closed at t = 0. Applied voltage is V(t) = 100 Cos (1000 t + 60)0. [8+8]

Obtain the expressions for star-delta equivalence of resistive networks Determine the voltage appearing across terminals y-z if a d.c. voltage of 100V is applied across x-y terminals in the figure. [6+10]

6.a)

Define self inductance, mutual inductance and coefficient of coupling. Derive the relation connecting the above quantities. Determine the coefficient of coupling K for the magnetically coupled coils if the power dissipated in 10 ohms resistance is 40W. {As shown in the Figure}. [8+8]

7.a)

ld .

A series R - C circuit is excited by sinusoidal voltage I=Im sin wt. Find the expression for impedance using phasor diagram. Determine the supply voltage and the power factor in the following network if the total power delivered is 200 W. [6+10]

nt

b)

uW

or

b)

in

5.a) b)

In a series RLC circuit R = 1k Ω L = 100mH and C=12pF. If a voltage of 200V is applied to the combination. Find, i) Resonance frequency ii) Q-factor iii) Bandwidth iv) Voltage across L and C. Derive the expression for impedance parameters in terms of h-parameters for a two port network. [8+8]

Aj

8.a)

b)

*****

Code.No: 21117

SET-4

RR

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD I .B.TECH SUPPLEMENTARY EXAMINATIONS FEBRUARY - 2010 NETWORK THEORY (COMMON TO EEE, ECE, CSE, EIE, BME, IT, E.CON.E, CSS, ETM, ECC, ICE) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --State and explain the Norton’s theorem. Use Thevenins theorem to find the power consumed in (5 + j5) Ω impedance in the network shown in figure. [6+10]

2.a)

Derive the expression for i(t) for R - L series circuit when excited by a sinusoidal source. For R - L - C series circuit with R = 10 Ω , L = 0.2 H, C = 50 micro farads, determine the current i(t) when the switch is closed at t = 0. Applied voltage is V(t) = 100 Cos (1000 t + 60)0. [8+8]

or

Obtain the expressions for star-delta equivalence of resistive networks Determine the voltage appearing across terminals y-z if a d.c. voltage of 100V is applied across x-y terminals in the figure. [6+10]

nt

3.a) b)

uW

b)

ld .

in

1.a) b)

4.a)

Aj

b)

Define self inductance, mutual inductance and coefficient of coupling. Derive the relation connecting the above quantities. Determine the coefficient of coupling K for the magnetically coupled coils if the power dissipated in 10 ohms resistance is 40W. {As shown in the Figure}. [8+8]

b)

7.a)

b)

8.a)

b)

in

A balanced delta connected load having impedances of values 20 ∠ -600 ohms each and a balanced star connected load having impedance of value 10 ∠ 300 each are supplied by the same 3 phase 400V, with phase sequence ABC. Obtain the line currents. Derive the relationship between line and phase quantities in a balanced delta connected system, with the help of phasor diagram. [8+8]

Define the following: i) Oriented graph ii) Tree of a graph iii) Cut set and a Basic Cut set iv) Tieset & Basic Tieset. For the topological graph shown in the figure, obtain the fundamental Tie set matrix choosing the tree containing two elements 5 & 6. Derive expression for elements of m-derived low pass T filter in terms of proto type T network. [4+4+8]

Aj

nt

c)

In a series RLC circuit R = 1k Ω L = 100mH and C=12pF. If a voltage of 200V is applied to the combination. Find, i) Resonance frequency ii) Q-factor iii) Bandwidth iv) Voltage across L and C. Derive the expression for impedance parameters in terms of h-parameters for a two port network. [8+8]

ld .

6.a)

or

b)

A series R - C circuit is excited by sinusoidal voltage I=Im sin wt. Find the expression for impedance using phasor diagram. Determine the supply voltage and the power factor in the following network if the total power delivered is 200 W. [6+10]

uW

5.a)

*****