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2003 Course Utilization of Electrical Energy

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Total No. of Questions : 12] P1338 [Total No. of Pages :3 [3764] - 202 B.E. (Electrical) UTILIZATION OF ELECTRICAL ENERGY (2003 Course) (403142) Time : 3 Hours] [Max. Marks:100 Instructions to the candidates: 1) Answer 3 questions from Section I and 3 questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) Discuss the different methods of electric heating and their relative merits. [8] Explain the various ways in which the temperature in resistance oven can be controlled. [8] OR Q2) a) What are the modern welding techniques? Describe them. [8] b) An insulating material 2 cm thick and 200 cm2 in area is to be heated by dielectric heating. The material has relative permitivity of 5 and power factor of 0.05 power required is 400W and frequency of 40 MHz is to be used. Determine the necessary voltage and the current that will flow through the material. If the voltage were to be limited to 700V, what will be the frequency to get the same loss? [8] Q3) a) What are the various applications of electrolysis? Explain extraction of [8] metals (Take example of any metal). b) Discuss the objective of electroplating and describe any one process for electroplating. [8] OR P.T.O. Q4) a) Explain faraday s laws of electro-deposition. Also explain what is the need of electrodepositions. [8] b) With the help of a circuit diagram, explain the working of a water cooler.[8] Q5) a) State and explain laws of illumination. [6] b) What is flood-lighting and where it is used. [6] c) What are the requirements of good lighting? Explain in detail. [6] OR Q6) a) State and describe various types of lighting schemes. [6] b) Explain with a neat diagram the principle of operation of a sodium vapour lamp. Mention its use. [6] c) A room of size 15x6 metres is to be illuminated by twenty 200W lamp. The mscp of each lamp is 250. Assume a depreciation factor 1.2 and utilization factor 0.6. Find the average illumination produced on the floor. [6] SECTION - II Q7) a) b) What are the different traction systems? Discuss them in brief. [8] Draw a general block diagram for A.C. electric locomotive and explain it. [8] OR Q8) a) b) Q9) a) What are the advantages and disadvantages of electric traction? [8] Discuss various current collection system used in electric traction. [8] Derive expression for simplified quadrilateral speed-time curve. [8] b) The distance between two stations is 1km and the schedule speed is 30 kmph, station stopping time 20 seconds. Assuming braking retardation 3 kmphps and maximum speed 1.25 times the average speed. Determine the acceleration required to run the service if the speed time curve is approximated by a trapezoidal curve. [8] Q10)a) Draw the speed time curve of a sub-urban and urban service train and explain. [8] [3764]-202 2 b) An electric train has an average speed of 42 kmph on a level track between stops 1400 m apart. It is accelerated at 1.7 kmphps and is braked at 3 kmphps. Estimate the energy consumption at the axle of train per tonne-km. Take tractive resistance constant at 50N / tonne & allow 10% rotational inertia. [8] Q11)a) What is regenerative braking? Discuss the suitability of dc shunt and series motors and 3 induction motor for electrical regenerative braking. [6] b) Differentiate between shunt transition and bridge transition. Draw the label circuit diagram for the same. [6] c) Explain the suitability of dc series motor for traction duties. [6] OR Q12)a) Explain with the energy diagram how the energy is saved with series-parallel starting in case of a locomotive engine using 4 motors for [6] the operations. b) What should be the essential electric & mechanical features of traction motors. [6] c) A train weighing 500 tonnes is going down a gradient of 20 in 1000. It is desired to maintain train speed at 40 kmph by regenerative braking. Calculate the power fed into the time. Tractive resistance is 40 N/tonne and allow rotational inertia of 10% and efficiency of conversion of 75%. [6] kbkb [3764]-202 3

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