DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING Accredited by NBA, New Delhi for 3 years:26/7/18 to 30/6/21 2 nd ASSIGNMENT

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1 DAYANANDA SAGAR ACADEMY OF TECHNOLOGY AND MANAGEMENT (Affiliated to Visvesvaraya Technological University,Belagavi & Approved by AICTE,New Delhi) Udayapura, Kanakapura Road, Opp: Art of Living, BANGALORE Subject: CONTROL SYSTEMS Subject code: 15EE61 DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING Accredited by NBA, New Delhi for 3 years:26/7/18 to 30/6/21 2 nd ASSIGNMENT Class: 6 th SEM B.E. Faculty:USHA S COURSE OUTCOMES (COs): At the end of the course students should be able to: CO2: Evaluate the transfer function, stability of a linear time invariant system. CO3: Apply block diagram manipulation and signal flow graph methods to obtain transfer function of systems. Q.No. Questions COs 1. Determine the transfer function = for the system represented in fig.july 2018 (8 M) 2. Obtain using block diagram reduction rule.july 2018 (8 M) 3. Illustrate how to perform the following in connection with block diagram reduction techniques. (i) Shifting take-off point before &after a summing point. (ii) Shifting a summing point behind and ahead the block. Jan 2016 (4 M) Define the following terms related to signal flow graph with a neat schematic: (i) Forward path (ii) Feedback loop (iii) Self loop (iv) Source node. July 2015 (8 M) 4. Draw a block diagram for the electric circuit shown in Fig and obtain the transfer function Eo(s)/Ei(s) Jan 2016 (8 M) Page 1 of 10

2 5. For the signal flow graph shown in Fig, find the overall transfer function by (i) Block diagram reduction technique. (ii) Verify the result by mason s gain formula.july 2015 (8 M) 6. What is stable and unstable systems? What is the difference between absolute and relative stable systems? Jan 2016 (6 M) K(s + 13) G(s) = s(s + 3)(s + 7) A unity feedback control system has, using Routh s criterion calculate the range of K for which the system has its closed loop poles more negative than -1. Jan 2016 (6 M) 7. Obtain the transfer function using signal flow graph. By Mason s gain formula. (10 Marks, June/July 2014) 8. A system oscillate with frequency "ω" if it has a pole at S=± and no pole in right half of s plane. Determine the value of K and 'a' so that the system shown in fig. Oscillate at a frequency of 2rad/sec. July 2018(8 M) 9. What are necessary and sufficient condition for a system to be stable according to RH criteria. July 2018(4 M) Determine the stability of the system represent by following characteristics equation, S 5 + 4S 4 + 8S 3 +8S 2 + 7S + 4 = 0 July 2018(4 M) 10. State the different rules for construction of root loci. ( 08 marks, June/July 2011 ) 11. Sketch the root locus for a negative feedback control system given by G(s)H(s)= (12 marks, June/July 2011 ) 12. Explain briefly the following terms with respect to root-locus technique: i) Centroid ii) Asymptote ( 04 marks, June/July 2009) Define break away point on a root locus. Explain any one method of determining the same. ( 04 marks, Dec 2010 ) Page 2 of 10

3 DAYANANDA SAGAR ACADEMY OF TECHNOLOGY AND MANAGEMENT Affilated to Visvesvaraya Technological University,Belagavi & Approved by AICTE,New Delhi) UDAYAPURA, KANAKAPURA ROAD, BANGALORE-82 DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING (Accredited by NBA, New Delhi for 3 years: 26/7/18 to 30/6/21) Subject: Power System Analysis-I Subject code: 15EE62 2 nd ASSIGNMENT Class: 6 th SEM B.E. Faculty: Ramya S Rajan COURSE OUTCOMES (COs): At the end of the course students should be able to: CO3 -Evaluate symmetrical components in an un-balanced system & explain the concept of sequence impedance and sequence networks of power system components and power system. CO4- Analyze the unsymmetrical faults using Symmetrical components and dynamics of single machine/infinite bus system. Questions COs 1. (a) Derive expression for symmetrical components in terms of phase voltage.[dec 18/Jan 19,6 Marks] (b) Obtain the relationship between line and phase sequence components of voltages in star connection. Give the relevant Phasor diagrams. [June/July 2016,8Marks] 2. (a) Derive an expression for 3ϕ, complex power in terms of symmetrical components. [Dec 18/Jan 19,6 Marks] (b) Explain the concept of phase shift in star delta transformer bank [June/July 2018,04Marks] 3. (a) Prove that i) (1+α+α 2 )=0 ii) (α+α 2 )=j 3 iii)(α 2 -α)=-j 3[June/July 2018,04Marks] (b) A balanced connected load is connected to a 3φ symmetrical supply. The line currents are each 10A in magnitude. If fuse in one of the line is blown out. Determine the sequence component of the line current.[dec 18/Jan 19,4 Marks] 4. The voltage at the terminals of a Three phase balanced load consisting of three (10+j8) Ω connected in star are V ab =100 0 V, V bc = V, and V ca = V. Find the power consumed in load using symmetrical components[june/july 2017,8Marks] 5. What are sequence impedances and sequence networks. Draw the single phase zero sequence networks for the transformers connected in different configurations. [June/July 2017, 8MarksJan 2017,8 Marks] 6. (a) Explain measurement of negative sequence impedance of synchronous generator. [June/July 2016,6Marks] (b) Prove that a balanced set of 3-phase voltages will have only positive sequence components of voltages only. [June/July 2014,06Marks] 7. (a) With the help of relevant vector diagrams for voltages and currents establish the phase shift of symmetrical components of Y- transformer. [Jan2017,6Marks] (b) Draw the zero sequence impedance network of a transformer for the following connection : [June/July 2015,6 Marks] 8. A delta connected balanced resistive load is connected across an unbalanced 3-phase supply as shown in Fig. With currents in lines A and B specified, find the symmetrical components of line currents. Also, find the symmetrical components of delta currents (phase currents). Page 3 of 10

[Jan 2017,8 Marks] 9. A 25MVA, 11KV 3Фgenerator has a sub transient of 20%. The generator supplies two motors over a transmission line with transformers at both sides as shown in single line diagram.

4 [Jan 2017,8 Marks] 9. A 25MVA, 11KV 3Фgenerator has a sub transient of 20%. The generator supplies two motors over a transmission line with transformers at both sides as shown in single line diagram. The motors have rated inputs of 15 MVA and 7.5MVA both at 10 kv with 25% sub-transient reactance.the 3-Ф transformers are both rated 30MVA, kv, connection -Y with leakage reactance of 10% each. The Series reactance of the line is 100Ω. Draw the positive, negative and zero sequence network of the system with all reactances marked in PU. Assume that the negative sequence reactance of each machine is equal to the sub transient reactance. Select the generator rating as the base in the generator circuit. Assume the zero sequence reactance for the generator and motors is 0.6pu each. Current limiting reactors of 2.5Ω each are connected in the neutrals of the generators and motors. The zero sequence reactance of transmission line is 300Ω.. [June/July 2017,12Marks] 10. Draw the positive, negative and zero sequence network of the system shown below. Choose a base of 50 MVA, 220KV in the 50 Ω. Transmission line and mark all reactances in PU. The ratings are G1-25 MVA, 12 KV, X =20%, G2-25 MVA, 11 KV, X =20%,T1 to T4-20 MVA,11/220KV,X=15%. The negative sequence reactance of each synchronous machine is equal to sub-transient reactance. The zero sequence reactance of each machine is 8%. Assume that the zero sequence reactance of line is 250% of their positive sequence reactance. 11. Figure shows a power system network. Draw positive, negative and zero sequence network. The system data is as under: Page 4 of 10

5 [June/July2013,15marks] 12.(a) What are the different types of faults occurring in electrical power system and probability of occurrence? [June/July 2013,4marks,May/June 2010,4marks,Jan 2017,4 Marks] (b) Discuss briefly the open-conductor faults in power systems. [June/July 2016,8Marks,Dec 2017,10Marks,Jan 2017,6 Marks] CO-4 CO-4 Page 5 of 10

6 DAYANANDA SAGAR ACADEMY OF TECHNOLOGY AND MANAGEMENT (Affiliated to VTU & Approved by AICTE, New Delhi) Opp. to Art of Living International Centre, Udaypura, Kanakpura Road, Bangalore DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING Subject: DIGITAL SIGNAL PROCESSING Subject code: 15EE63 Class: 6 th SEM B.E. Faculty : Nadhia C 1. Why FFT is needed? Calculate the number of additions & multiplications needed in the calculation of DFT and FFT, N=4, 16, 64, 256, 512 Also, find the speed improvement factor. ( Dec 18/Jan19,6M) 2. What are the differences and similarities between DITFFT and DIFFFT algorithm? Explain in place computation in FFT ( Dec 18/Jan19,6M) 3. Prove periodicity and symmetry property of a twiddle factor. (June/July 16,4M) 4. Develop DIT-FFT algorithm for N=8 and draw the complete signal flow graph. (10M Dec 14) 5. An 8 point sequence is given by x(n)={2,2,2,2,1,1,1,1} Compute its DFT by Radix 2 DITFFT algorithm. (June/July18,8M) 6. Using DIFFFT algorithm compute the sequence x(n)={1,2,-1,2,4,2,-1,2}( Dec 18/Jan19,10M) 7. Compute the 8-point IDFT of the sequence X(K)={0, 2+2j, -j4, 2-2j, 0, 2+2j, j4, 2-2j} using inverse radix 2 DIF FFT algorithm. ( Dec 18/Jan19,6M) 8. The first five points of the 8 point DFT of a real valued sequence is given by X(k) = {4, 1 j2.41, 0, 1 j0.414, 0}. Write the remaining points and hence find the sequence x(n) using inverse radix 2 DIT FFT algorithm. (June/July18,8M) 9. Calculate the IDFT of x(k) = {0, j 2.828, 0, 0, 0, 0, 0, j 2.82} using inverse radix 2 DIT FFT algorithm. (12M June/July16) 10. If x 1 (n) =(1,2,0,1) and x 2 (n) = (1,3,3,1) obtain x 1 (n) N x 2 (n) by using DIF FFT algorithm. (June/July18,8M) 11. Find the 4-point DFT of the sequence, x (n) = cos (nπ/4) using DIF-FFT algorithm. (6M Dec 15/Jan16) 12. Use impulse invariance method to design a digital filter from an analog prototype that has a system function : H ( s) a = s + a ( s + a) 2 + b 2 and H b ( s) = b 2 2 ( s + a) + b (6M June/July17) (10 Jun 10) Page 6 of 10

7 DAYANANDA SAGAR ACADEMY OF TECHNOLOGY AND MANAGEMENT (Affiliated to Visvesvaraya Technological University, Belagavi, & Approved by AICTE, New Delhi) Opp. Art of Living, Udayapura, Kanakapura Road, Bangalore DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING (Accredited by NBA, New Delhi for 3 Years, Validity: 26/7/18 to 30/6/21) Subject with Code: Electrical Machine Design (15EE64) Assignment-2 Class: VI SEM B.E. Faculty: Rajath GR Course outcomes: At the end of the course the student will be able to: CO-1 Discuss design factors, limitations, modern trends in design, manufacturing of electrical machines and properties of materials used in the electrical machines CO2 Design main dimensions with winding details of transformer and Estimate the number of cooling tubes, no load current and leakage reactance of core type transformer. Design and analyze the different types of machines such as DC Machines, three phase Induction Motors and Synchronous machines Sl.No Questions COs 1. Give the step by step procedure of designing a shunt field coil for a DC machine. 2. Derive the output equation of DC machine. Mention the factors affecting on output equation of a dc machine. 3. Discuss the various factors which govern the choice of the number of poles in DC machines. 4. Define specific loadings for DC machines and what are the merits and demerits of selecting higher values of specific loadings. What are the factors to be considering during the choice of specific loading? 5. Discuss the factors to be considered while fixing the dimensions of the armature slots in dc machine. 6. Determine the main dimensions of the armature core, number of ventilating ducts, number of conductors of a 350 KW, 500V 450 rpm, 6 pole, shunt generator assuming square pole faces with pole arc 70% of pole pitch. Assume the mean flux density to be 0.7 T and ampere conductor per centimetre to be Calculate the diameter and length of armature for a 7.5Kw, 4 pole, 1000rpm, and 220V DC shunt motor. Given full load efficiency = 0.83, maximum flux density = 0.9Wb/m 2 ; specific electric loading = AC/m field form factor = 0.7. Assume that the maximum efficiency occurs at full load and field current is 2.5% of rated current. The pole face is square. 8. Find the main dimension, number of poles and length of air gap of a 1000KW, 500V, 300rpm DC generator. Assume the specific loading, Bav = 0.7 Wb/m 2. Ampere conductor/m = Square pole face, ratio of pole arc to pole pitch is 0.7. Assume efficiency as 92% and gap contraction factor is A design is required for a 50Kw, 4 pole, 600 rpm, DC shunt generator. The full load terminal voltage is 220V. If the maximum gap density is 0.83 wb/m 2 and the armature ampere conductor/ meter is Calculate the suitable dimensions of armature core to give square pole face. Assume that the full load armature voltage drop is 3% of rated terminal voltage and that of field current is 1 % of rated full load current. Ratio of pole arc to pole pitch is Find the main dimension and the number of pole of a 37KW, 230V; 1400 rpm shunt motor so that a square pole face is obtained. The average gap density is 0.5Wb/m 2 and the Page 7 of 10

8 ampere conductors per meter are The ratio of the pole pitch is 0.7 and the full load efficiency is 90%. 11. A 5KW, 250V, 4pole, 1500 rpm shunt generator is designed to have a square pole face. The loading are: average flux density in the gap = 0.42wb/m 2, AC/m = 15000, find the main dimensions of the machine. Assume full load efficiency = 87% and ratio of pole arc to pole pitch = A 150KW, 230V, 500rpm DC shunt motor has square field coil. Find the number of poles, main dimensions and air gap length. Assume average gap flux density=0.85 Tesla, ampere conductor/cm=290, ratio of width of pole body to pole pitch =0.55, ratio of pole arc to pole pitch=0.7, efficiency =91% take mmf for air gap = 55% of armature mmf gap, contraction factor = Page 8 of 10

9 DayanandaSagar Academy of Technology and Management Department of Electrical & Electronics Engineering Internal Assessment-II (EVEN SEM ) Subject: SENSORS & Sub code:15ee662 Faculty name: TRANSDUCERS R.GOVINDAPPA Course outcomes(final):at the end of the course the student will have the: CO1. Ability to discussneed,understanding of working&recent trends of sensors & transducers, their Classification & selection, advantages and disadvantages. CO2. Ability to discuss basics of signal conditioning and signal conditioning equipment. CO3. Ability to discuss configuration of Data Acquisition System and data conversion. CO4. Ability to show knowledge of data transmission and telemetry. CO5. Ability to explain measurement of non-electrical quantities temperature, flow, speed, force, torque, power and viscosity. Note:ANSWER TO ALL QUESTIONS Q Questions Mark s CO s 1 Define the signal conditioning stage in an instrumentation or measurement 8 CO2 system and list the advantages & disadvantages 2 Explain briefly the following functions of signal conditioning equipments. 8 CO2 i. Amplification. ii. Modifications or modulation. iii. Impedance matching. iv. Data processing. v. Data transmission 3 How the signals are conditioned in a dc & ac system and explain briefly.[6 M] 8 CO2 June/July 2018] 4 Explain briefly the following amplifier. 8 CO2 i. Mechanical amplifier. ii. Fluid amplifier. iii. Electrical and electronic amplifier. iv. Buffer amplifier. vi. Differential amplifier..[6 M]June/July 2018] 5 a. Write a short notes on Modulated, un-modulated signals & common 4 CO2 mode of reduction ratio (CMRR). b. What is attenuator? And how they are classified. 4 CO2 6 a. Define data acquisition and Data acquisition system with applications. 4 CO3 [6 M]June/July 2018] b. Explain briefly with a block diagram of a generalized DAS and What are 4 CO3 the factors that decide the configuration of a DAS 7 Write the short notes on the followings. i. Analog DAS. ii. Automated Das. iii. Digital DAS 8 CO3 8 Define the term data transmission and telemetry with their differences. [6 M] June/July 2018] 9 Explain briefly the following with the block diagrams. i. Mechanical transmission. ii. Mechanical transmission. iii. Pneumatic transmission. iv. Magnetic transmission. 10 With the block diagram explain briefly the working function of general telemetry system Page 9 of 10 8 CO4 8 CO4 8 CO4

10 11 Describe briefly the voltage & current telemetry system and their advantages. [6 M] June/July 2018] 12 Write the short notes on, i. RF Telemetry system, ii. Modulation and demodulation system, iii. Amplitude modulation, iv. Frequency modulation 8 CO4 8 CO4 <<<<<< O>>>>> Page 10 of 10

BE Semester- VI (Electrical Engineering) Question Bank (E 605 ELECTRICAL POWER SYSTEM - II) Y - Y transformer : 300 MVA, 33Y / 220Y kv, X = 15 %

BE Semester- VI (Electrical Engineering) Question Bank (E 605 ELECTRICAL POWER SYSTEM - II) Y - Y transformer : 300 MVA, 33Y / 220Y kv, X = 15 % BE Semester- V (Electrical Engineering) Question Bank (E 605 ELECTRCAL POWER SYSTEM - ) All questions carry equal marks (10 marks) Q.1 Explain per unit system in context with three-phase power system and