POWER ELECTRONICS

POWER ELECTRONICS
SEM-VI, 2012
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 Hours

Total Marks: 100

Note: Attempt all question. Use of calculator is permitted.

Answer any four parts of the following:

1. What are the different methods of firing employed for SCR triggering? Explain UJT firing circuit with relevant waveforms.
2. Discuss the two transistor model of thyristor and derive an expression for the anode current.
3. Draw the static V-I characteristics of SCR and explain its mode of operation.
4. Name the different power electronic converters available and list their advantages over conventional modes of conversion and control.
5. What are the characteristics of n ideal power switching device? Compare the characteristics of IGBT and MOSFET.
6. Draw & Explain the circuit diagram for turning on & Turning off operation of a G.T.O.

SYSTEM ENGINEERING (utu previous year question paper)

SYSTEM ENGINEERING
SEM-V, 2011-12
B.TECH EXAMINATION
utu previous year question paper

Time: 3 hours

Total Marks: 100

Attempt any four parts:

1. What is open loop and closed loop system? Give advantages and disadvantages of closed loop control system.
2. Explain force-voltage analogy with relevant diagram and equations.
3. Draw f-i analog system of Fig. 1.

   

   Figure. 1

4. Determine the transfer function C/R from the system shown in Fig. 2, using block diagram reduction technique.

   

   Figure . 2

5. Represent the following set of equation by a signal flow graph and determine the overall gain relating x and x using Mason's gain formula.
   x = ax₁ + fx₂          x = bx₂ + ex₄
   x = cx₃ + hx₅         x = dx₄ + gx₂
6. For the following mechanical system shown in Fig. 3.
   (a) Draw free body diagram
   (b) Write the system dynamic equations
   (c) Draw electrical analogous circuit

   

   Figure.3

OPTICAL FIBER COMMUNICATION (utu question papers)

OPTICAL FIBER COMMUNICATION SYSTEM
SEM-VII, 2012-13
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 Hours

Total Marks:100

Attempt any four parts:

1. Discuss Dispersion mechanism with respect to single mode fiber indicating the dominating effects and then show how inter-modal dispersion may be minimize within the single mode region.
2. Briefly discuss with the aid of a suitable diagram what is meant by the acceptance angle for an optical fiber. Show how this is related to the fiber numerical aperture and the refractive indexes for the fiber core and cladding?
3. A step index with a large core diameter compared with the wavelength of the transmitted light has an acceptance angle in air of 22 degree and a relative refractive index difference of 3%. Estimate the numerical aperture and the critical angle at the core-cladding interface of the fiber.
4. What are the modes in optical fiber? Calculate number of modes for a graded index optical fiber if core diameter (d = 62.5 μ m), NA =0.275 and Operating wavelength = 1300 nm.
5. Two polarization maintaining fibers operating at the wavelength of 1.3 micrometer have beat length of 0.7 mm and 0.8 mm. Determine the briefringence in each case and comment the result.
6. Derive an expression for the acceptance angle for skew rays which changes direction by an angle of 2γ at each reflection in step index fiber in terms of NA and γ.

SWITCH GEAR AND PROTECTION (utu previous question papers)

SWITCH GEAR AND PROTECTION
SEM-VII, 2012-13
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 Hours

Total Marks: 100

Note: Attempt all the questions.

Attempt any four parts of the followings:

1. Explain role of protection in a power system. What are the fundamental requirements of protective relaying?
2. Discuss the role of back up protection. What is the various method of giving back up protection?
3. Discuss briefly the following:
   (a) Pick up
   (b) Selectivity
   (c) Stability
   (d) Flag indicator
   (e) Burden of relay
4. What do you mean by PSM and TMS? Explain how these factors are affecting the relay operation?
5. Explain the working principle of induction type electromagnetic relay.
6. What is Buchholz relay? Which equipment is protected by it? For what type of fault is it employed? With neat diagram discuss its working principle.

DESIGN ANALYSIS OF ALGORITHMS B. TECH SEM V (2012 -13) (utu previous year question paper)

DESIGN ANALYSIS OF ALGORITHMS B. TECH

 SEM V (2012 -13)

UTTARKHAND TECHNICAL UNIVERSITY

Time : 3 Hours 

Total Marks : 100

SECTION - 1

Attempt any four

1. Is         =O(2n) ? Is 2     O(2 ) ?
2. Arrange the following in order of best to worst efficiency : O(n log n ), O(n ), O(n ), O(n log   ).
3. Give an analysis of worst case running time of quicksort . When does it occur ?
4. Give an array of 8 element which is the worst case for Insertion Sort .
5. Define the asymptotic notations used for best case average case and worst case analysis of algorithms.
6. Show that the solution T(n) = T(           ) + 1 is O( lg n ) .

 SECTION - 2

Attempt any two 

1. (A) Insert the following values one at a time into an initially empty red-black tree 41, 38, 31, 12, 19, 8 (B) Show that, for arbitrarily large values of n , there are red - black tree with n nodes that have height 2 logn - O(1) .
2. Suppose that a node x is inserted into a red-black tree with RB-INSERT and then immediately deleted with RB-DELETED . Is the resulting red-black tree the same as the initial red -black tree ?
3. Insert the following nodes into an empty AVL tree . Show each step and what rotations are needed . Nodes to insert : 10, 40, 35, 25, 60, 30, 80, 50, 27, 28, 38

SECTION - 3 

Attempt any two    

 

1. (A) What is the difference between a pure recursive solution and a dynamic programming solution to a problem ?                                                                                                                                      (B) What do we understand by the "optimal substructure property" in a dynamic programming problem? 
2. Explain N-queens problem with an algorithm. Explain why backtracking is defined as a default procedure of last resort for solving problems .
3. (A) State if backtracking always produces optimal solution.                                                            (B) Describe how to implement a queue using two stacks and O(1) additional memory , so that the amortized time for any enqueue or dequeue operation is O(1) . The only access you have to the stacks is through the standard subroutines PUSH and POP .

SECTION - 4

Attempt any two 

1. Solve the following instance of the single - source shortage paths problem with vertex "v3" as the source .
2. Draw a (simple) directed weighted graph G with 10 vertices and 18 edges ,such that G contains a minimum-weight cycle with at least 4 edges . Show that the Bellman - Ford algorithm will find this cycle .
3. Show how to modify Dijkstra's algorithm for the case when the graph is directed and we want to compute shortage directed paths from the source vertex to all the other vertices . 

SECTION - 5

Attempt any two 

1. (A) How do we establish that a problem is NP-Complete ?                                                            (B)  Given a graph G and vertices s and t, does G contain a walk from s to t such each vertex of G is visited at a once and at most 100 times .
2. What happens when we use the Goemans-Williamson algorithm for MAX-CUT an a triangle ? Square ? Pentagon? Specifically , what can be inferred on the algorithm's ratio and on the integrality ratio of the relaxation ?
3. Show that the Next-Fit algorithm for BP (BIN-PACKING) achieves an asymptotic ratio of 2. Show that FF(1) < NF(1) .

.................................

DIGITAL SIGNAL PROCESSING

DIGITAL SIGNAL PROCESSING
SEM-V,2012-13
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 Hours 

Total Marks: 100

SECTION - A

Attempt any four parts of the following:

1. If two discrete - time LTI systems are cascaded, then prove or disprove that interchanging their order does not change the total system.
2. Test the following systems are stable or not:
   (i) y(n) = cos[x(n)]
   (ii) 
3. Derive the condition for impulse response of causality and stability properties in LTI systems.
4. Differentiate between DTFT and DFT.
5. Differentiate between FFT and DCT.
6. Discuss about the application of adaptive filtering in echo cancellation.

ANTENNA AND WAVE PROPAGATIONS

ANTENNA AND WAVE PROPAGATIONS
SEM-V, 2012-13
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 Hours

Total Marks: 100

Attempt any four of the following:

1. Define Gain and Beam width of an antenna.
2. Explain the term " Antenna Impedance" and” Radiation resistance".
3. An antenna has a radiation resistance of 72 Ohms, a loss resistance of 8 Ohms and a power gain of 12 dB. Determine the antenna efficiency and its directivity.
4. Write in brief the working of Yagi Antenna.
5. Discuss the term " Linear Polarization" and "Elliptical polarization"
6. Determine the electric field at a point "p" due to doublet of length "dl". Obtain the expression for radiation resistance (R_r) of such doublet.

ANN AND FUZZY LOGIC

ANN AND FUZZY LOGIC
SEM-VII, 2012-13
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 hours

Total Marks: 100

Note: Attempt all questions.

Answer any four:

1. What is a biological neuron? Given its structure and explain its functioning.
2. Explain McCulloh Pitts model of artificial neuron.
3. Using artificial neuron model with 'Threshold' function show its use as 'OR' and 'AND' gates.
4. Differentiate between a single layer perception and a multi layer perception.
5. Discuss log sigmoid and tan sigmoid activation functions.
6. Draw an MLP of [5, 3, 2] structure and mark the directions of signal and error flow.

Answer any four:

1. Draw any four types of membership functions and give their mathematical expressions.
2. How is a fuzzy set represented? Define support, height and compliment of a fuzzy set.
3. If A = [a₁, a₂] and B = [b₁, b₂] are two fuzzy sets, what will be the resulting sets after performing addition, subtraction, multiplication and division operations on the sets?
4. Describe briefly Mamdani's inference system.
5. What do you understand by 'Cartesian product' of two fuzzy sets? If A = {0.2/x₁, 0.5/x₂, 1/x₃} and B = {0.3/y₁, 0.9/y₂} find the Cartesian product between A and B.
6. What is Defuzzification? Give various methods of defuzzification.

COMPUTER BASED NUMERICAL TECHNIQUE (CBNST)

COMPUTER BASED NUMERICAL TECHNIQUE (CBNST)
SEM-III,2010-11
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 2 hours

Total Marks: 75

Attempt any three parts of the following:

1. If X = 2.536, find the absolute error and relative error when
   (i) X is rounded and
   (ii) X is truncated to two decimal digits.
2. Find a real root of cos x = 3x - 1, correct to three decimal places by iteration method.
3. Using Regula-Falsi method, compute the smallest positive root of the equation x e^x - 2 = 0, correct upto four decimal places.
4. Find the root of the equation x³ - x -1 = 0 by using Muller's methods.

POWER SYSTEM ANALYSIS (utu previous year question papers)

POWER SYSTEM ANALYSIS
SEM-VI, 2012
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time :3 hours

Total Marks:100

Note: Attempt all questions

Attempt any four parts out of the following

1. Why do we prefer to analyze unsymmetrical faults by symmetrical component methods?
2. A single phase two-winding transformer is rated 20 kVA, 480/120 V, 60 Hz. The equivalent leakage impedance of the transformer referred to the 120V winding 2, is Z_eq2 = 0.0525 ∠ 78.13^oΩ. Using transformer ratings as base values determine the per unit leakage impedance referred to winding 2 and referred to winding 1.
3. Bus voltages at Bus-1 and Bus-2 in a two-bus system with a purely reactive transmission line between Bus-1 and Bus-2 are 1.00∠ 0^o and 1.05∠ -10^o ,respectively. In what directions real and reactive powers will flow? Explain why?
4. Transmission line between Bus-1 and Bus-2 of a two bus system has a serial impedance of R + JX and shunt admittance of jY. Find the Bus Admittance Matrix.
5. What is the need of a reference buses are there in an interconnected system?

DATA STR. USING C++

DATA STR. USING C++
SEM-VI, 2012
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 hours

Total Marks: 100

Attempt any four of the following:

1. Explain the meaning of following expression f(n) is n⁰⁽¹⁾
2. Prove the following statement
   2^n+a is 0(2ⁿ)
3. Find the computational complexity for the following loop
   for (cnt 4 = 0, i=1; i<=n, i*=2)
   for (j=1; j<=i, j++)
   cnt 4++;
4. Write a member function to check whether two singly lists have the same contents.
5. Write a member function to reverse a singly linked list using only one pass through the list.
6. Write a function to insert a node in the middle of a doubly linked list.

AUTOMATIC CONTROL SYSTEMS

AUTOMATIC CONTROL SYSTEMS
SEM-V, 2012-13
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
utu previous year question paper

Time : 3 Hours

Total Marks:100

Attempt any four parts of the following:

1. What is effect of adding pole to a system? Discuss.
2. What is feed forward compensation? Clearly show block diagram.
3. What is Mason's Gain formula?
4. For the above system find the integral square error given by
   
   and comment on the same. The input r(t) is unit-step input
   and u = unit step input, find x(t).
5. Find the damping factor ζ, natural frequency ω_n peak time T_p and percentage overshoot for the system
   .
   Draw its pole zero location.
6. Derive the close loop transfer C(S)/R(S) = M (S) for the system shown below and find its sensitivity with respect to G and H.
   

SOLID MECHANICS

SOLID MECHANICS
SEM-III, 2012-13
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time- 3 Hours

Total Marks- 100

Attempt any four:

5×4=20

1. Draw the stress strain diagram for copper and explain the various points on it.
2. Give the various mechanical properties of materials and explain any four of them.
3. State any four assumptions made in the theory of simple bending.
4. Explain equilibrium equations.
5. Using Mohr's circle method, find the principle stress when the element is subjected to a state of pure shear stresses of value 'q'.
6. Define principle plane and principle stress.

DISCRETE STRUCTURE

DISCRETE STRUCTURE
SEM-III, 2011-12
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
utu previous year question paper

Time: 3 Hours

Total Marks:100

Note: Attempt all questions. Be precise in your answer.

Attempt any four of the following:

1. For any two sets A and B, prove that following:
   (i) (A ᴗ B)^C = A^C ᴖ B^C
   (ii) (A ᴖ B)^C = A^C ᴗ B^C
2. Let A be the set {1, 2, 3}, define the following types of binary relation on A.
   (i) A relation that is both symmetric and antisymmetric
   (ii) A relation that is neither symmetric nor antisymmetric.
3. Let f : A→ B and g : B→ C be two invertible mapping then prove
   (i) gof is invertible
   (ii) (gof)^-1 = f ^-1og ^-1
4. Prove by induction method that if n ≥ 10, then 2ⁿ > n3.
5. Prove that contradiction that √5 is irrational.
6. Prove that the intersection of two equivalence relation is also an equivalence relation, but the union of two equivalence relation may not be an equivalence relation.

VLSI CIRCUIT DESIGN (utu previous year question papers)

VLSI CIRCUIT DESIGN
SEM-VI, 2012
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(utu previous year question paper)

Time: 3 hours

Total Marks:100

Note: Attempt ALL question. Assume suitable data if necessary.

Attempt any four parts of the following:

1. Consider an N-channel MOSFET with N_A= 3 x 10¹⁶/cm³ and t_ox = 450^o A. Let L = 1.25μm and assume that r_j = 0.5μm. Calculate the threshold voltage shift due to short channel effect.
2. Explain the term "self aligned gate". What is the requirement of self aligned gate? How it is achieved.
3. A MOS transistor has threshold voltage of 0.85 V. The body effect coefficient γ = 0.64. Calculate the threshold voltage for V_SB = 4V and 2φF = -0.58 V.
4. What do you understand by strong inversion in MOSFET?
5. Explain the electrical properties of the MOSFET, CMOS and BCMOS.
6. What is pass transistor? Explain with suitable example.

IT IN BUSINESS (utu previous year question papers)

IT IN BUSINESS
SEM-VII, 2012-13
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 Hours

Total marks: 100

Attempt any four questions

1. What are the reasons for the explosion in IT? How do the firms apply for IT innovations?
2. What is competitive advantage for a firm? How can a firm sustain a competitive advantage?
3. What are the basic elements of strategy? What are strategic decisions?
4. What is meant by an Information Economy?
5. Draw a diagram to show how a manager can integrate technology with decision making.
6. Explain critical success factors with suitable example.

COMMUNICATION ENGINEERING

COMMUNICATION ENGINEERING
SEM-IV, 2012
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 2 Hours

Total Marks: 50

Attempt any four:

3×4=12

1. What is amplitude modulation and explain the low level and high level A. M. modulation method with the help of block diagram?
2. A modulation signal 10sin (2 Ω×10³t) is used to modulate a carrier signal 20sin (2Ω×10⁴t).Determine the modulation index, percentage modulation, frequencies of the sideband components. What will be the bandwidth of the modulated signal?
3. What is single sideband suppressed carrier modulation? Write one method of SSB generation and why is SSB not used for broadcasting?
4. What is DSB-SC? Explain the generation of DSB-SC with proper waveform and diagram.
5. What is VSB-SC? Explain the generation and detection of VSB-SC with suitable waveforms and diagram.
6. Calculate the percentage power saving when the carrier and one of the side bands are suppressed in an AM wave modulated to a depth of (1)100% (2)50%.

APPLIED & ELECTRONICS INSTRUMENTATION

APPLIED & ELECTRONICS INSTRUMENTATION
SEM-V, 2011-12
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
utu question paper

Time: 3 Hours

Total Marks: 100

Attempt any four parts:

1. Explain the following terms with suitable example and graph:
   (a) Accuracy and Precision
   (b) Dead time and Dead zone
   (c) Sensor and Actuator
2. What are the input test signals and give the dynamic characteristics for the first order system with suitable example?
3. Why Sensitivity and Linearity are the two conflicting requirements in a resistive potentiometer?
4. Two plates of parallel plate capacitive transducer are 30 mm apart and the space is filled with two different dielectric materials, one material is 1 cm thick with dielectric constant of 10, if the capacitive transducer were to be made with single dielectric material, what is the dielectric constant of that material?
5. A strain gauge has a gauge factor of 4. If the strain gauge is attached to a metal bar that stretches from 0.25 to 0.255 mm when strained, what is the percentage change in resistance? If the unstrained value of gauge factor is 120Ω, what is the resistance value of gauge factor after application of strain?
6. Design the Wheatstone bridge arrangement employed for the measurement of Strain for the Quarter Bridge, Half Bridge and Full Bridge with respective sensitivity.

PRINCIPLE OF MANAGEMENT (utu question papers)

PRINCIPLE OF MANAGEMENT
SEM-VI, 2012
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
utu question paper

Time: 2 Hours

Total marks:  50

1. Please read the following case let carefully and answer the questions given at the end

• The world's leading mobile phone company, Nokia Corporation, launched its 'take back' campaign in early 2009. The initiative, aimed at educating mobile phone users about the importance of recycling e-waste, had launched in a number of countries since 2005.

Main issues behind these campaigns were:

(a) Sustainability

(b) Recycling

(c) Awareness campaigns

On January 1, 2009, Nokia India, the Indian arm of world's leading mobile company, announced this 'take-back' campaign, on the occasion of the launch of the initiative, S.Shailendra, Managing Director,

   Nokia India said "if every Nokia user recycled just one unused phone, the discarded phone will live on in something new, as the material is used to make item like park benches, utensils etc."

   This campaign was first launched in 2005 in Finland before which it handled pilot project in the UK

   And Sweden during the late 1999s. It supported the concept of individual producer responsibility (IPR)

   And the take-back initiative was launched or an IPR initiative. According to the company, Nokia was very environment conscious and followed the " design for Environment" process where it took into account environmental aspects in every phase of product development right from the beginning of product life cycle.

Questions:

(a) Critically Analyze the Nokia's Take Back Initiative.

(b) Do you think Nokia's Take-Back initiative will receive good response in India? What should Nokia's strategy is to create awareness about recycling e-waste among Indian consumers?

Utilization of electrical energy and traction (utu previous year question papers)

UTILIZATION OF ELECTRICAL ENERGY AND TRACTION
SEM-VII, 2012-13
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
utu question paper

Time: 3 hours

Total Marks: 100

Note: Attempt all the questions:

SECTION-A

Answer any four questions from the following:

1. Explain briefly the materials of heating elements.
2. What are the advantages of heating element?
3. Discuss the methods of temperature control of resistance ovens.
4. Mention the advantages of dielectric heating.
5. Discuss the relative merits and demerits of direct and indirect electric arc furnaces.
6. Explain different methods of induction heating. Give some application of induction heating

COMPUTER ORNANIZATION

COMPUTER ORGANIZATION
SEM-IV, 2013
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 Hours

Total Marks: 100

Attempt any four:

4×5=20

1. List the major component of computer organization and explain in detail.
2. Explain the IEEE standard for floating point numbers with suitable examples.
3. Explain the function of control unit and Instruction format in details.
4. What is RISC? Draw and explain the Berkeley RISC I instruction format.
5. Explain the importance of HOLD and HLDA pin data transfer through DMA.
6. Draw the block diagram of multiprocessor and explain the role of cache coherence in processor.

COMMUNICATION ENGINEERING

COMMUNICATION ENGINEERING
SEM-IV, 2013
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Marks: 50

Time: 2 hrs

Q1: Attempt any four

1. Why do we require modulation?
2. Derive the equation that represents amplitude modulation?
3. Draw the block diagram of superheterodyne receiver.
4. Explain a method to demodulate single sideband signal.
5. Explain the square law diode modulator for AM generation.
6. Derive the power relation for amplitude modulated wave.

ELECTRO-MECHANICAL ENERGY CONVERSION-II

ELECTROMECHANICAL ENERGY CONVERSION-II
SEM-IV, 2013
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
utu question paper

Attempt any four:

5*4=20

1. How a synchronous machine is different from an Induction machine?
2. What is known as Hunting in Synchronous machine?
3. Explain the working principle of a synchronous motor with neat diagram.
4. Explain the principle of operation of infinite bus.
5. Explain what is armature reaction in synchronous machine.
6. What are the conditions necessary for the parallel operation of synchronous generators?

ELEMENTS OF POWER SYSTEM

ELEMENTS OF POWER SYSTEM
SEM-IV, 2013
B.TECH EXAMINATION
UTTARAKHAND TECHNICAL UNIVERSITY
(UTU)

Time: 3 hours

Total Marks: 100

Attempt any four:

5*4=20

1. What do you understand by single line diagram of a power system?
2. Explain circuit breaker and isolator. 
3. Define terms- Skin effect, Kelvin's law, Proximity effect.
4. Write the configurations of transmission line.
5. Briefly describe the power system elements.
6. Explain the different kinds of supply system.