B.Tech E & T 3rd Sem

BTCE19, BTCSE19, BTEE19, BTETE19,BTME19III SEMESTER B.TECH EXAMINATION, JANUARY-2013MATHEMATICS IIITime: 3 Hours Max. Marks: 75GROUP A : Answer any three questions. (Question No. 1 is compulsory)u uQ.1 If log Prove that x y 1(05)x yQ.2 Find the complete solution of the partial differential equation pq p q 0 .(10)Q.3 Prove that the rectangular solid of maximum volume which can be inscribed ina sphere is cube. (10)Q. 4 A tightly stretched string with fixed and points x = 0 and x = 1 is initially atrest in it’s equilibrium position. If it is set vibrating by given each point avelocity kx(1 – x) find displacement at any point of the string at any time t.(10)Q. 5 (a) Solve (D 2 – DD’)z = cosx coszy(b) eliminate the arbitrary function f from Z = f(x 2 +y 2 ) and form the PDE(10)GROUP B : Answer any three questions. (Question No. 6 is compulsory)2 ' 2Q.6 Solve (2D 5DD2D') z 0(05)Q.7 Find Laplace transform of the following periodic functionst 0 tf ( t)(10)t t 2Q. 8 Apply picard’s method to find y(0, 1) and y(0, 2) given the first order ODEequation.dy x x2 y and y(0) = 1 (10)dxQ. 9 (a) If u = sin –1 (x 2 + y 2 ) 5 1Prove that ,222 u u 2 u 2x 2xy ytan u .2 2x x y 2y 252(b) Solve p tanx + q tany = tanz (10)Q. 10 State and prove connelution theorem. Hence evaluateLs(s11(10)2a2)

GROUP C: All Questions are Compulsory.Q.11 Fill in the blanks (each question carries 2 marks)(i) If f(x,y,z)= 0 then x/ y . y/ z . z/ x = --------------.(ii) If z = f ( x , y) then x is known as ------------ error.(iii) If u & v are the functions of x & y , then ( u , v) / ( x , y) X ( x , y) / ( u ,v) = --------.(iv) (x , y)/ ( r, ) X ( r, ) / ( x, y) = ---------.(v) L[ e at t n ] = ---------.Q.12 Multiple choice question. (Each question carries 2 marks)(i) The partial differential equation of all spheres whose centre lies on z- axis is(a) py =qx(b) p =qx(c) py =q(d)py -qx(ii) If f(x) = x sin x in (- , ) ,then value of b n =(a) 1 (b) 0(c) 2(d)-1(iii) The equation of heat flow in one dimension is(a) u/ t =c 2 2 u/ x (b) u/ t =c 2 u/ x 2(c) u/ t =c 2 2 u/ x 2 (d) u/ t =c 2 u/ x 2(iv) Laplace transform of (t sin t) is(a) 2s/(1+ s) (b) s/(1+ s 2 )(c) 2s/(1+ s 2 ) (d) 2s/(1+ s 2 ) 2(v)2 u/ x 2 + 2 u/ y 2 = f(x,y) is known as(a) Linear equation (b) Poisson equation(c) Hyperbolic(d)Quadratic equationQ.13 True or false (each question carries 1 mark).(i) sin -1 (x 2 + y 2 )/ (x + y ) is a Homogeneous function(ii) If z = f(x,y), then dz = f/ x . dx + f/ y . dy.(iii) L -1 [ 1/s] = 1.(iv) By removing arbitrary constant partial differential equations can be solved.(v)The error occurred due to omission of some values is refereed as truncationerror.f x1 for 00 for2xx2******

BTCSE21/BTEE21/BTETE21III SEMESTER B.TECH EXAMINATION, JANUARY-2013SIGNALS & NETWORKTime: 3 Hours Max. Marks: 75GROUP A : Answer any three questions. (Question No. 1 is compulsory)Q.1 Write the properties of the system function. (05)Q.2 For the resistive two port network of following figure find (10)(a) G 212 V'(b) Z 112 V'V1I 1(c) Y 212 I'V1Q. 3 In the circuit shown in following figure find the voltage at node 1, and thecurrent I 1 . Assume the direction of current as shown. (10)Q.4 With the help of necessary sketches, explain the constructional details of theUJT with its applications. (10)Q.5 A capacitor of 15F being charged initially to 10V is connected to a resistanceof 10k and is allowed to discharge through it by switching of a switch k.Find the expression of discharging current. (10)GROUP B : Answer any three questions. (Question No. 6 is compulsory)Q.6 What is Linear & Non- liner signal? (05)Q.7 Explain(a) Time invariant & time variant network.(b) Casual & Non-casual Network (10)Q.8 What is meant by system function & explain Impedance, Admittance, Voltageratio transfer function & current ratio transfer function. (10)Q.9 Explain impulse response of series RC network. (10)Q.10 Explain driving point function & Transfer function for any network. (10)

GROUP C: All Questions are Compulsory.Q.11 Fill in the blanks (each question carries 2 marks)(i) In electrical sense, the signal can be _______.(ii) If the signals are represented with respect to ______ as an independentvariable. It is called frequency domain representation.(iii) A ____ is a set of branches of graph of a network that do not contain anyloops.(iv) The path directly joining two nodes is called _____ .(v) ______ are the branches of the network & graph which are removed in orderto from a tree.Q.12 Multiple choice question. (Each question carries 2 marks)](i) Driving point impedance ( Z 11 ) is given by(a)I2V1(b)I1V1(c)(ii) Reverse transfer impedance ( Z 12 ) is given byVI12(d)VI11(a)I2V1(b)I1V1(c)(iii) Driving point admittance (y 11 ) is given by(a)I2V1(b)I1V1(c)(iv) Forward transfer admittance (y 21 ) is given by(a)I2V1(b)I1V1(v) Which of the following condition is not correct for symmetric networks.(a)Z11 Z22(b) Y11 = Y22(c) h 11 h 22 – h 12 h 21 = 1 (d) A DQ.13 True or false (each question carries 1 mark).(i) h11 is called short circuit input impedance.(ii) There is a definite relationship linking the number of branches and links of agiven network which is given by l = b – n + 1.(iii) Constant voltage source in S-domain is represented by V(s).(iv) Time dependent voltage source V = f(t) in S – domain is represented by V/S.(v) Constant current source I, in S-domain is represented by I/S.(c)VII12VI12V12(d)(d)(d)VII11VI11V11******

BTCSE22,BTEE22,BTETE22III SEMESTER B.TECH EXAMINATION, JANUARY-2013DIGITAL ELECTRONICSTime: 3 Hours Max. Marks: 75GROUP A : Answer any three questions. (Question No. 1 is compulsory)Q.1 What are flip flop and counter excitation tables? (05)Q.2 What is the difference between synchronous and asynchronous presetting incounters? How can be presentable counters be used to construct counters withvariable modules? (10)Q.3 Briefly describe how the hardware of an asynchronous UP-counter differsfrom that of a DOWN counter. (10)Q.4 Draw the RAM architecture and briefly describe it. (10)Q.5 Draw the timing diagrams during READ and WRITE operation of SRAM.(10)GROUP B : Answer any three questions. (Question No. 6 is compulsory)Q.6 Write advantages of digital system. (05)Q.7 Write short note on gray code. (10)Q.8 Represent (39) 10 & (46) 10 in (10)(a) 1’s complement representation.(b) 2’s complement representationQ.9 State and Explain different laws of Boolean algebra. (10)Q.10 Design half adder and full adder circuit. (10)GROUP C: All Questions are Compulsory.Q.11 Fill in the blanks (each question carries 2 marks)(i)(ii)(iii)(ii)(v)Adding (24)16 to (FE1)16 produces ____________A ______________ is a digital function that produces the arithmetic sumof two binary numbers in parallel .The __________ MOS conducts when its gate to source voltage ispositiveOR Logic is __________logicData selectors are basically the same as ______________Q.12 Multiple choice question. (Each question carries 2 marks)(i)ASC11 is(a)American standard code of information institution

(ii)(iii)(iv)(v)(b)American standardized convert international information(c)American standardized convert information institution(d)American standard code of information interchargeSOP is(a)Standard of product(b)Standard of pass(c)Sum of product(d)Sum of passD flipflop stands for(a)Delay FF(b)Data FF(c)Decay FF(d)Del FFAND logic is(a)Subtraction logic(b)Addition logic(c)Multiplication logic(d)Division logicStandard SOP form consist of(a)Min term(b)Max term(c)Multiple terms(d)Minimized termsQ.13 True or false (each question carries 1 mark).(i) NOR gate is universal gate(ii) RAM is random access memory(iii) Byte is group of 16 bits(iv) Following symbol for MAND gate(v)PISO is parallel in serial out.******

BTCSE23, BTEE23, BTETE23, BTME23III SEMESTER B.TECH EXAMINATION, JANUARY- 2013ELECTRICAL MACHINESTime: 3 Hours Max. Marks: 75GROUP A : Answer any three questions. (Question No. 1 is compulsory)Q.1 Determine the current distribution in each branch for the circuit? (05)Q.2 How can the parameters of the equivalent circuit of transformer bedetermined? Draw the necessary circuits and derive the equations. (10)Q.3 Calculate the capacitance of the metal plates of are 4 m 2 and separated by adielectric of 3mm thick and of relative permittivity 6. If the electric fieldstrength in the dielectric is 600 v/m. Calculate the total charge on each plate?(10)Q.4 What will be the values of capacitance, charge & energy, if the capacitance ofa parallel plate capacitor with area of 600cm 2 and a dielectric thickness of1.5mm when dielectric is air, if the Capacitor is charged 100volts? (10)Q.5 A dc series motor is coupled to a mechanical load whose torque requirementvaries as the square of speed. Assume that the magnetic circuit is unsaturated.When the motor is supplied at 300 V, the speed and armature current are 350rpm and 30 A. It is desired that speed should be 500 rpm. Find the appliedvoltage and armature current. Armature and series field resistances are 0.2each. (10)GROUP B : Answer any three questions. (Question No. 6 is compulsory)Q.6 What are the types of DC motor & its application? (05)Q.7 Explain working of synchronous motor. (10)Q.8 Using Nodal voltage method find the current is a 4 resistance for the n/wshown bellow. (10)3Ω 2V 2Ω2Ω4Ω 4VQ.9 Distinguish between conductor & insulator. (10)4V

Q.10 What are the starting methods of synchronous motor, Explain any one method.(10)GROUP C: All Questions are Compulsory.Q.11 Fill in the blanks (each question carries 2 marks)(i)(ii)(iii)(iv)(v)emf equation of alternator is ______In dc series motor torque is directly proportional to ____ of armature current.In lap winding no. of poles _____ to no. of parallel path.From short circuit test we determine _____.The efficiency of transformer is maximum when copper losses ____ to ironlosses.Q.12 Multiple choice question. (Each question carries 2 marks)](i)(ii)(iii)(iv)In a dc compound generator flat compound characteristic is obtained byconnecting variable resistance.(a) across the series field(b) in series with series field(c) in parallel with shunt field(d) in series with shunt fieldWhat are the effect of armature reaction(a) cross magnetizing(b) magnetizing(c) de-magnetizing(d) all of abovesmaller air gap in polyphase I.M. helps to(a) reduce the chances of crawling(b) increase starting torque(c) reduce chance of logging(d) reduce magnetizing currentThe dummy coils in DC machine are useful to(a) increase efficiency(b) imprese commutation(c) reduce cost of machine (d) none of above(v)Direction of dc series motor can be changed(a) by interchanging supply terminal(b) by interchanging field terminal(c) either changing supply terminal or interchanging field terminals(d) by interchanging supply terminal as well as field terminalQ.13 True or false (each question carries 1 mark).(i) The synchronous reactance is reactance due to armature reaction of machine(ii) In full pitch coil the coil span and pole pitch are equal(iii) The maximum torque will depend on rotor resistance(iv) The use of higher fluse density in the transformer design increase weight perKVA.(v) The power factor of a synchronous motor is independent of its excitation.

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BTETE20III SEMESTER B.TECH EXAMINATION, JANUARY-2013PRINCIPLES OF PROGRAMMINGTime: 3 Hours Max. Marks: 75GROUP A : Answer any three questions. (Question No. 1 is compulsory)Q.1 Compare (a) array and vector(b) call by value and call by reference (05)Q.2 Explain direct file organization and indexed sequential file organization. (10)Q.3 Explain abstract data types with example. (10)Q.4 Declare a class employee having data members as emp-id& name from thisclass derive two classes as worker and manager. Class worker will haveadditional data members as “skill” i.e. “welding” etc. and manager will haveadditional data members as car allowance. Accept and display data for theobject of class. (10)Q.5 WAP to define a structure tender having data members tender no, cost,company name. Accept and display data for one variable of this structure. (10)GROUP B : Answer any three questions. (Question No. 6 is compulsory)Q.6 Why study programming language? (05)Q.7 Discuss embedded system environment and its effect on language design. (10)Q.8 What are virtual computers and language implementation? (10)Q.9 Discuss Byte code and explain JVM in detail? (10)Q.10 Discuss storage representation for linear data structure. (10)GROUP C: All Questions are Compulsory.Q.11 Fill in the blanks (each question carries 2 marks).(i)(ii)(ii)(iv)(v)Data object represents a ___________________ for data values.Embedded computer system is often a ________________composed of morethan one computerA ______________ is a data object containing an unordered collection ofdistinct values.______________ means the ability of a single operator or subprogram nameto refer to any number of function definitions depending on the data types ofthe arguments and results.Prolog is a______ programmingQ.12 Multiple choice question. (Each question carries 2 marks)(i)The programs executed by a computer are written in the following language.(a) High level (b) Low level (c) Machine level

(ii)(iii)(iv)(v)A program statement that serves to communicate to the language translator ininformationabout the name and type of data object needed during programexecution is called(a) Definition (b) Declaration (c) FunctionIn which the data structure is stored in a single contagious block of storagethat include both descriptor and component is(a)Sequential representation (b) Linked representationThe following are the most important alternative in use for easily decodingduringexecution(a) Machine code sequence (b) Tree structure (c) Prefix form (d) all of themA function can be called by following of them(a) Call by name (b) Call by value (c) Call by reference (d) All of themQ.13 True or false (each question carries 1 mark).(i)(ii)(iii)(iv)(v)Orthogonality refers to the attribute of being able to combine various featuresof a languages in all possible combination, with every combination beingmeaningful.Java is a platform independent language.Character string are always of fixed length.An object is an instance of a class.In smalltalk methods are consider a messages send to object.******

III SEMESTER B TECH IN ELECTRONIC ANDTELECOMMUNICATION ENGINEERINGEXAMINATION JANUARY-2013ELECTRICAL MACHINESBTETE24P- IITime: 1 hours(5X5=25)I. ANSWER ALL QUESTIONS1. State & explain reciprocity theorem & millman theorem.2. How can a delta circuit be converted into a star circuit?3. Explain compound motor & series motor.4. Why synchronous motor is not self starting?5. State and explain Kirchhoff's law.

BTETE25P- IIII SEMESTER B TECH IN ELECTRONIC ANDTELECOMMUNICATION ENGINEERINGEXAMINATION JANUARY-2013Time: 1 hoursSIGNALS&NETWORKS(5X5=25)I. ANSWER ALL QUESTIONS.1. What are different types of network?2. What is incidence matrix?3. What are network variables?4. What is transfer function?5. What is complex frequency?