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2003 Course Utilization of Electrical Energy

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Total No. of Questions : 12] [Total No. of Pages : 3 [3864] - 222 P 1060 B.E. (Electrical) UTILIZATION OF ELECTRICAL ENERGY (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 03 questions from Section I and 03 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) What are the factors which decide the frequency and voltage of dielectric heating? Derive an expression for the heat produced in a dielectric material. [8] Describe the construction and working of Ajax Wyatt induction type furnace. [8] OR Q2) a) b) Discuss the methods of temperature control of resistance ovens. [8] The power required for dielectric heating of a slab of resin 150 cm2 in area and 2 cm thick is 200 watts. Frequency of 30 MHz. The material has a relative permitivity of 5 and pf. 0.05. Determine the voltage necessary and current flowing through the material. If the voltage is limited to 600 V, what will be the value of the frequency to obtain the same heating. [8] Q3) a) b) Explain briefly extraction and refining of metals by electrolysis. [8] What is electro deposition & explain in detail various factors which have effect on the appearance and quality of the deposited surface. [8] OR P.T.O. Q4) a) b) Describe the process of electro-extraction of Zinc and Aluminium. [8] Draw electric circuit of refrigerator and explain its working. How can temperature inside the refrigerator be adjusted. [8] Q5) a) b) Discuss the requirement of good lighting. [8] Explain the working of a high pressure mercury vapour lamp giving its circuit diagram. Give its advantages, disadvantages and applications. What is the usual value of power factor for this lamp. [10] OR Q6) a) b) What are the general principles that are usually employed in the design of street lighting & explain. [8] A hall 30 m long and 12 m wide is to be illuminated and illumination required is 50 meter candle. Five types of lamps having lumen outputs as given below are available Watts : 100 200 300 500 1000 Lumens : 1615 3650 4700 9950 21500 Taxing a depreciation factor of 1.3 and utilisation coefficient of 0.5, calculate the number of lamps needed in each case to produce required illumination. Out of the above five types of lamps select most suitable type and design a suitable scheme and make a sketch showing location of lamps. Assume a suitable mounting height and calculate space-height [10] ratio of lamps. SECTION - II Q7) a) b) Explain different systems of electric traction existing in our country.[8] Compare the DC and AC systems of railway electrification from the point of main line and sub urban line railway service. [8] OR Q8) a) b) Explain current collection system in electric traction. [8] What are the advantages of electric traction over other types of traction systems. [8] Q9) a) Draw and explain a typical speed-time curve for an electric train and explain what do you understand by crest speed, average speed and schedule speed. [8] [3864] - 222 -2- b) An electric train has quadrilateral speed-time curve as follows : i) Uniform acceleration from rest at 2 kmphps for 30 seconds. ii) Coasting for 50 seconds. iii) Uniform braking to rest for 20 seconds. 10 , train resistance is 1000 40 N/tonne rotational inertia effect 10% of dead weight and duration of stop 30 seconds. Find schedule speed. [8] If train is moving a uniform up gradient of OR Q10)a) b) Q11)a) b) Derive an expression for specific energy output on level track using a simplified speed-time curve. [8] An electric train is to have acceleration and braking retardation of 0.8 kmphps and 3.2 kmphps respectively. If the ratio of maximum to average speed is 1.3 and time for stops 26 seconds. Find schedule speed for a run of 1.5 km. Assume simplified trapezoidal speed-time curve. [8] Give the essential electrical and mechanical characteristics of traction motors. [8] What are the advantages and disadvantages of regenerative braking & explain how regenerative braking can be obtained in dc locomotives.[10] OR Q12)a) b) Compare shunt and bridge transition? [8] A motor coach weighing 150 tonnes is equipped with four 600 V motors for series parallel control. If during series - parallel starting the current per motor is maintained at 300 Amp. Calculate : i) The duration of starting period. ii) The speed of train at transition. iii) The Rheostatic losses during 1) Series 2) Parallel steps and start. At 300 A, 600 V, the tractive effort is 15000 N per motor and the train speed is 30 kmph. Assume the train is started up a gradient of 1% and train resistance is 10 N/tonne. Allow 10% for the effect of rotational [10] inertia. Each motor has a resistance of 0.1 . [3864] - 222 -3-

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