Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV Year UTILIZATION OF ELECTRICAL ENERGY Previous Question Paper (June/July - 2024 - R18)
Note: Part A is compulsory (25 Marks). Answer all questions. Part B (50 Marks) - Answer any one question from each unit (10 marks each).
Part A
What is the principle of Induction heating?
Answer
Write any three applications of dielectric heating.
Answer
- Preheating of plastic preforms before molding.
- Gluing of wood in furniture manufacturing.
- Dehydration and drying of food products and textiles.
Write any two application of Electrolysis.
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Describe Projection welding.
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What is meant by luminance? Define specific height ratio.
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What are the requirements of lighting system?
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What are various factors on which choice of traction system depends?
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List difference between AC and DC systems of traction?
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Which type of laws is used for railway lighting?
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Explain the concept of double battery parallel block system in electric train lighting.
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Part B
i) How will you control most efficiently the heat of resistance furnace? ii) What advantages does graphite electrode process over carbon electrode?
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A 20-kW, 230-V, and single-phase resistance oven employs nickel-chrome strip 25-mm thick is used, for its heating elements. Calculate the width and length of the wire if temp does not exceed 1200C and charge is at 700C.
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A low-frequency induction furnace has a secondary voltage of 20 V and takes 600 kW at 0.5 pf when the hearth is full. If the secondary voltage is maintained at 20 V, determine the power absorbed and the power factor when the hearth is half-full. Assume the resistance of the secondary circuit to be doubled and the reactance to remain the same.
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Explain principle of arc welding and operation with neat diagram?
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Explain the various methods of electric resistance welding with neat sketches.
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Describe Spot welding with neat diagram.
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With a neat diagram, explain the working of metallic Arc welding.
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Explain with connection diagram the operation of the low-pressure fluorescent lamp and state its advantages.
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The luminous intensity of a lamp is 600 CP. Find the flux given out. Also find the flux in the hemisphere containing the source of light and zero above the horizontal.
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What polar curves are as applied to light sources? Show how these curves are used for finding in MHCP and MSCP?
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Two lamps are 16m apart and are fitted with a 100 candle power lamp each at a height of 6m above the ground. Calculate the illumination on the ground i) under each lamp ii) mid-way between the lamps.
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Derive an expression for specific energy output on level track using a simplified speed–time curve.
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An electric train has an average speed of 40 kmph on a level track between stops 1,500 m apart. It is accelerated at 2 kmphps and is braked at 3 kmphps. Draw the speed–time curve for the run.
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What are the different methods of approximation of speed-Time curves? Derive expression for distance travelled using quadrilateral approximation method of V(t) curve.
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A 200 Tonne motor each having 4 motors, each developing 6000Nm torque during acceleration, starts from rest. Calculate time taken to attain speed of 50Kmph.
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Mention the requirements of railway coach air conditioning.
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Describe the concept of single battery system.
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Describe the method of obtaining constant output in train lighting.
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Describe the train lighting by making use of 25KV AC supply?
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