Janardan Rai Nagar Rajasthan Vidyapeeth 2007-2nd Sem B.Tech Electrical Engineering I SINGALS & NETWORKS - Question Paper

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BACHELOR IN TECHNOLOGY
(SEMESTER - III) (COMPUTER/ELECTRICAL/ELECTRONICS & ELECOMM.)
BSCO3/BSE3/BSET3 – SINGALS & NETWORKS
TIME: 03 HOURS MAX. MARKS: 75
GENERAL INSTRUCTIONS:
1. Question paper is divided into 3 groups
2. Each group is of 25 marks every
3. Figure to the right in bracket shows mark
4. Assume suitable data if necessary
GROUP A: ans any 3 ques.. ques. No. one is compulsory.
Q.1. Explain the ramp function and obtain its Laplace transformation. (05)
Q.2 Solve (D3 – 3D2 + 3D -1) y = t2 et provided that y(0) = 1, y'(0) = 0,
y'' (0) = -2 (10)
Q.3 Write the necessary condition for transfer point function. (10)
Q.4 Explain (a) Node (b) Branch (c) Tree (d) Incidence matrix
(c) Cotree (10)
Q.5 Explain with proper diagrams what do you mean by shifted impulse function and shifted step function. (10)
GROUP B: ans any 3 ques.. ques. No. six is compulsory.
Q.6 Solve the subsequent differential formula x”( t ) + three x’( t ) + two x( t ) = 4et. provided that x( 0- ) = one and x’( 0- ) = -1. (05)
Q.7 Find out the inverse Laplace transform of F(S) = (10)
Q.8 Determine the driving point impedance Z( s ) for the network shown in figure. (10)
Q.9 Find the poles and zeros of the network function N(S) = (10)
S2 ( S + two )___
( S + one ) ( S2 + 4S + five )
Q.10 Obtain foster – I and foster – II form of the subsequent impedance
function (10)
Z(S) = (S2 + one ) (S2 + nine )
S ( S2 + four )
GROUP C: All ques. are Compulsory.
Q.11 Fill in the blanks (each ques. carries two marks)
(i) In a transistor, the input junction is_______biased and output junction is________biased.
(ii) The phase reversal occurs only in__________configuration.
(iii) The ‘Q’ point is provided by the___________of DC and AC load lines.
(iv) For a transistor, the typical value of ‘ hfe’ in CE circuit is_______
(v) The SCR is_______made of germanium.
Q.12 Multiple option ques.. (Each ques. carries two marks)
(i) The collector material of a transistor is
(a) moderately doped (b) lightly doped
(c) heavily doped (d) none of these are accurate
(ii) The leakage current in a transistor is due to
(a) high doping level (b) low doping level
(c) 2 junctions (d) minority carriers
(iii) The 3 terminals of a UJT are
(a) Collector, Base, Emitter (b) Emitter, Base-1, Base-2
(c) Drain, Gate, Source (d) Collector, Gate, Emitter
(iv) The ripple factor of the bridge rectifier is
(a) 40.6 (b) 81.2
(c) 0.482 (d) None of them
(v) A buffer amplifier acts as
(a) an isolator in a multi-stage amplifier(b) a booster
(c) an attenuator (d) all the above are accurate
Q.13 True or false (each ques. carries one mark).
(i) Mesh analysis is based on KVL.
(ii) The number of branches in a tree is more than the number of branches in a graph.
(iii) The signal x( t ) is stated to be odd or nonsymmetric if x( -t ) = -x( t ).
(iv) Y parameters are reciprocal of Z parameters.
(v) Differentiation of Laplace transform of unit function is equal to impulse function.

Earning:   Approval pending.