JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year NETWORK THEORY Previous Question Paper (November/December - 2018 - R16)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
What is cut set matrix?
Answer
A cut-set matrix is a matrix that relates the branch currents of a network to the cut-set currents. It provides a systematic way to represent the topology of a graph by identifying the set of branches which, if removed, would disconnect the graph into two parts.
Define: i) Flux ii) Reluctance iii) M.M.F.
Answer
i) Flux (Φ): The total number of magnetic field lines passing through a given surface area.
ii) Reluctance (S): The opposition offered by a magnetic circuit to the establishment of magnetic flux, defined as the ratio of M.M.F to flux.
iii) M.M.F (Magnetomotive Force): The force that drives magnetic flux in a magnetic circuit, equal to the product of the number of turns and the current (NI).
What is balanced supply and balanced load?
Answer
Sign in to view the complete answer paper.
What is the significance of phase sequence?
Answer
Sign in to view the complete answer paper.
Sketch the DC response of RL circuit and response curve.
Answer
Sign in to view the complete answer paper.
Define time constant of R-C circuit excited d.c source.
Answer
Sign in to view the complete answer paper.
Define Port and Two-port network.
Answer
Sign in to view the complete answer paper.
Two two-port networks with transmission parameters A1, B1, C1, D1 and A2, B2, C2, D2 respectively are cascaded. What is the transmission parameter matrix of the cascaded network?
Answer
Sign in to view the complete answer paper.
What is the function of a band elimination filter?
Answer
Sign in to view the complete answer paper.
What is a high pass filter? In what respects it is different from a low pass filter?
Answer
Sign in to view the complete answer paper.
Part B
Explain self inductance and mutual inductance.
Answer
Sign in to view the complete answer paper.
Find the value of XL in the coupled network shown in figure 1 for making it series resonant.
Answer
Sign in to view the complete answer paper.
Obtain tie-set schedule for the network shown in figure 2.
Answer
Sign in to view the complete answer paper.
Explain Faradays law of electromagnetic Induction.
Answer
Sign in to view the complete answer paper.
An unbalanced delta connected load is connected across a balanced 3 phase RYB 440V supply. Find the wattmeter reading connected in the circuit shown in figure 3.
Answer
Sign in to view the complete answer paper.
Three impedances Za = 6∠90, Zb = 6∠0 and Zc = 6∠-90 ohms are connected in star. Calculate the values of Zx, Zy and Zz of the equivalent delta. Derive the formula used.
Answer
Sign in to view the complete answer paper.
A balanced three phase three wire system has a Y-connected load. Each phase contains three loads in parallel: -j 100 Ω, 100 Ω and 50 + j50 Ω. Assume positive phase sequence with Vab = 400∠0 volts. Find (i) Van (ii) IaA (iii) The power factor of the load (iv) The total power drawn by the load.
Answer
Sign in to view the complete answer paper.
The switch in Figure 4 has been in position A for a long time. At t = 0, the switch moves to B. Determine v(t) for t > 0 and calculate its value at t = 1 s and 4 s.
Answer
Sign in to view the complete answer paper.
Find the Capacitor voltage for t<0 and t>0 for each circuit shown figure 5.
Answer
Sign in to view the complete answer paper.
At t = 0, switch 1 in Figure 6 is closed, and switch 2 is closed 4 s later. Find i(t) for t > 0. Calculate i for t = 2 s and t = 5 s.
Answer
Sign in to view the complete answer paper.
The switch has been in position a for a long time as shown in figure 7, At t=0 it moves to position b. Calculate i(t) for all t > 0.
Answer
Sign in to view the complete answer paper.
Explain different types network functions as applied to single port and two port network. Obtain Y12 of the given network shown in figure 8.
Answer
Sign in to view the complete answer paper.
Obtain the relation between Y and Z parameters.
Answer
Sign in to view the complete answer paper.
Find driving point impedances Z11 and Z22 transfer impedances Z21 and Z12 for the network shown in figure 9.
Answer
Sign in to view the complete answer paper.
Obtain the relationship between Z and h parameters.
Answer
Sign in to view the complete answer paper.
Derive the equations to find the inductances and capacitances of a constant K high pass filter.
Answer
Sign in to view the complete answer paper.
Explain low pass filters. Discuss the design considerations of K type-low pass filters.
Answer
Sign in to view the complete answer paper.