Rajiv Gandhi Proudyogiki Vishwavidyalaya 2009 B.E Electrical and Electronics Engineering(Marine) Electric circuit theory - Question Paper
2009 Rajiv Gandhi Proudyogiki Vishwavidyalaya(Technical University) B.E Electronics & Tele-Communication Engineering Model ques. paper third semester, electrical & electronics engineering ques. paper
ELECTRIC CIRCUIT THEORY
Time : three hours Maximum Marks : 100
PART – A
ans all ques. - every ques. carries four marks
(1) Compare and differentiate unilateral and bilateral systems. Can you apply reciprocity theorem to these?
(2) List the necessary conditions for driving point and transfer functions.
(3) 2 coupled coils have K = 0.8, N1 = 500 turns, N2 = 1000 turns and the mutual flux being 0.9Wb, obtain the primary coil flux. If the primary current is 10A, obtain the primary coil inductance. Also find the secondary inductance.
(4) In a transformer, K = 0.8, the mutual inductance = 10 H, the no. of primary and secondary turns are 50 and 200. find the value of the primary current to produce 0.5Wb flux to link with the secondary coil. Also, compute the value of secondary current.
(5) State and discuss Superposition theorem.
(6) three resistors R12, R23 and R31 are delta connected. Derive expressions for R1, R2 and R3 in equivalent star connected network.
(7) From basics find an expression for the potential difference ranging from star point of the load and supply neutral. Can this be greater than supply line voltage? discuss
(8) Substantiate the statement "A polyphase system is like a multicylinder engine."
(9) discuss how to develop a tieset matrix for a provided graph.
(10) List out the applications of MATLAB.
(10 x four = 40 marks)
PART – B
ans all ques. - every ques. carries 12 marks.
(11) obtain the power dissipated in the 5? resistor shown in the figure beneath using mesh analysis. (12 marks)
OR
(12) obtain the node voltages by node voltage analysis method. (12 marks)
(13) Write the mesh equations for the network shown in figure. (12 marks)
OR
(14) obtain the drop across the capacitor and the resistor. (12 marks)
(15) find the equivalent resistance for the network. All resistors are of 100????????? (12 marks)
OR
(16) Determine current through 3??resistor using Norton's theorem for the network shown. (12 marks)
(17) The total power supplied to 3 similar resistors connected in (a) Y (b) from a balanced 3? source is P. 1 of the resistors burn out. (i) Derive the expressions for power in terms of P for both cases. Hence (ii) compute the power taken from the supply system when 3 100? non inductive resistances are connected in (a) Y (b) across a 400V, 50Hz, 3??mains. (iii) In the event 1 of the resistances burn out, what would be the value of total power taken from the mains in every of the 2 cases?
(12 marks)
OR
(18) 3 impedances of ZR = 10 + j10 ??? ZY = 20 + j20 ??and ZB = 0 – j10 ?? are respectively star connected to a 3?, 400V symmetrical system of phase sequence RYB. obtain (i) the star point potential (ii) voltage drop across every impedance (iii) the current in every supply line (iv) phase angle ranging from the currents and corresponding line voltages (v) total real, reactive and apparent powers supplied to the load (vi) complete vector diagram of voltages and currents (vii) a balanced delta connected resistors which would take the identical power. (12 marks)
(19) For the graph shown in figure below, choose a tree T {5,6,7,8,9}.Show all the fundamental cutsets Write down the cutset matrix. find network equilibrium formula. How can these KCL equations be simulated in MATLAB? (12 marks)
OR
(20) With help of an example, show how P spice can be used for the electric circuit analysis. (12 marks)
(12 x five = 60 marks)
2009 Rajiv Gandhi Proudyogiki Vishwavidyalaya(Technical University) B.E Electronics & Tele-Communication Engineering Model question paper 3rd semester, electrical & electronics engineering Question paper
ELECTRIC CIRCUIT THEORY
Time : 3 hours Maximum Marks : 100
PART A
Answer all questions - Each question carries 4 marks
(1) Compare and differentiate unilateral and bilateral systems. Can you apply
reciprocity theorem to these?
(2) List the necessary conditions for driving point and transfer functions.
(3) Two coupled coils have K = 0.8, N1 = 500 turns, N2 = 1000 turns and the
mutual flux being 0.9Wb, find the primary coil flux. If the primary current is
10A, find the primary coil inductance. Also obtain the secondary inductance.
(4) In a transformer, K = 0.8, the mutual inductance = 10 H, the no. of primary
and secondary turns are 50 and 200. Obtain the value of the primary current to
produce 0.5Wb flux to link with the secondary coil. Also, calculate the value
of secondary current.
(5) State and explain Superposition theorem.
(6) 3 resistors R12, R23 and R31 are delta connected. Derive expressions for
R1, R2 and R3 in equivalent star connected network.
(7) From basics obtain an expression for the potential difference between star
point of the load and supply neutral. Can this be greater than supply line voltage? Explain
(8) Substantiate the statement "A polyphase system is like a multicylinder
engine."
(9) Explain how to develop a tieset matrix for a given graph.
(10) List out the applications of MATLAB.
(10 x 4 = 40 marks)
PART B
Answer all questions - Each question carries 12 marks.
(11) Find the power dissipated in the 5? resistor shown in the figure below
using mesh analysis. (12 marks)
OR
(12) Find the node voltages by node voltage analysis method. (12 marks)
(13) Write the mesh equations for the network shown in figure. (12 marks)
OR
(14) Find the drop across the capacitor and the
resistor. (12 marks)
(15) Obtain the equivalent resistance for the network. All resistors are of
100????????? (12 marks)
OR
(16) Determine current through 3??resistor using Norton's theorem for the
network shown. (12 marks)
(17) The total power supplied to three similar resistors connected in (a) Y (b)
from a balanced 3? source is P. One of the resistors burn out. (i) Derive the
expressions for power in terms of P for both cases. Hence (ii) calculate the
power taken from the supply system when three 100? non inductive resistances
are connected in (a) Y (b) across a 400V, 50Hz, 3??mains. (iii) In the event
one of the resistances burn out, what would be the value of total power taken
from the mains in each of the two cases?
(12 marks)
OR
(18) Three impedances of ZR = 10 + j10 ??? ZY = 20 + j20 ??and ZB = 0 j10 ??
are respectively star connected to a 3?, 400V symmetrical system of phase
sequence RYB. Find (i) the star point potential (ii) voltage drop across each
impedance (iii) the current in each supply line (iv) phase angle between the
currents and corresponding line voltages (v) total real, reactive and apparent
powers supplied to the load (vi) complete vector diagram of voltages and
currents (vii) a balanced delta connected resistors which would take the same
power. (12 marks)
(19) For the graph shown in figure below, Select a tree T {5,6,7,8,9}.Show all
the fundamental cutsets Write down the cutset matrix. Obtain network
equilibrium equation. How can these KCL equations be simulated in MATLAB? (12
marks)
OR
(20) With help of an example, show how P spice can be used for the electric
circuit analysis. (12 marks)
(12 x 5 = 60 marks)
Earning: Approval pending. |