Engineering BE Electrical Engineering Sem 7 December 2022 2022 Electrial Machine Design Question Paper - Mumbai University | munotes
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Questions asked in this paper
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Q1 Answer the following questions. 20 marks
- a) Define the term total magnetic loading, total electric loading, specific magnetic loading and specific electric loading
- b) Explain effect of short circuit ration on performance of synchronous machine
- c) What are the desired properties of conducting materials and insulating materials used in electric machines?
- d) Explain the need for CAD analysis
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Q2 a) Derive output equation of single-phase transformer and specify the various 10 marks
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Q2 b) Calculate approximate overall dimensions for a 200 kVA, 6600/440V, 50Hz, three phase core type transformer. The following data may be assumed: factor = 0.9. Use a3 stepped core. For 3 stepped core width of largest stamping = 0.9d, and net iron area = where d is diameter of circumscribing circle 10 marks
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Q3 a) Derive the output equation for a three-phase induction motor and specify the 10 marks
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Q3 b) Determine the main dimensions and number of turns per phase of a 3.7 kW, 400V, three phase 50Hz, squirrel cage induction motor to be started by star delta starter. Assume following data: Average flux density in the gap = 0.45 ampere conductors per meter = factor = 0.9, ratio of core length to pole pitch is 1.5 Define dispersion coefficient? Explain effect of dispersion coefficient on 10 Explain different cooling methods of transformer. 10 10 marks
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Q5 a) Write note on design of field winding of synchronous machines. 10 marks
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Q5 b) Determine the main dimensions, flux per pole and turns per phase of a 75000 peripheral speed should be about 40 m/s. Assume average gap density= 0.65 ampere conductors per meter= 40000 and current density= 4 A 10 marks
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Q6 a) Write note on design of EV grade induction motor. 10 marks
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Q6 b) flowchart explain synthesis method of computer aided machine design. 10 marks
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