Question Paper: Basic Mechanical Engineering (BME) : Question Paper Apr 2013 - First Year Engineering (Semester 2) | Pune University (PU)

Basic Mechanical Engineering (BME) - Apr 2013

First Year Engineering (Semester 2)

(1) Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8
(2) Assume suitable data, if necessary.

Answer any one question from Q1 & Q2

1 (a) Explain with neat sketch flange coupling.(6 marks) 1 (b) Explain the factors affecting the selection of material.(6 marks) 2 (a) Differentiate between flat belt drive and V belt drive.(6 marks) 2 (b) Write a note on four bar mechanism.(6 marks)

Answer any one question from Q3 & Q4

3 (a) Explain with sketches the different stages involved in manufacturing of sand casting.(7 marks) 3 (b) With neat sketches explain surface grinding and cylindrical grinding operations.(6 marks) 4 (a) Explain with neat sketch the major parts of a center lathe machine.(7 marks) 4 (b) Draw self explanatory sketches of various operations performed in sheet metal working.(6 marks)

Answer any one question from Q5 & Q6

5 (a) Define thermodynamic system. Explain its types with examples.(4 marks) 5 (b) Explain second law of thermodynamics for heat engine.(4 marks) 5 (c) A heat engine operates between source and sink temperatures of 235°C and30°C respectively. If heat engine receives 35KW from the source, find the net work done by the engine, the heat rejected to the sink by the engine and the efficiency of engine. Draw the sketch of system.(5 marks) 6 (a) State various statements and limitations of first law of thermodynamics.(4 marks) 6 (b) Define: Heat source, Heat sink, Thermal efficiency and Coefficient of performance.(4 marks) 6 (c) A U tube manometer is used to measure the pressure of a gas in the pipe. The level of liquid in the manometer arm open to the atmosphere is 170 mm lower than the level of the liquid connected to the gas pipe. The liquid in the manometer has specific gravity of 0.8. Find the absolute pressure of the gas if barometer reads 76 cm of mercury. Take the density of mercury as 13600 Kg/m3. Draw the sketch of system.(5 marks)

Answer any one question from Q7 & Q8

7 (a) Differentiate between fire tube boiler and water tube boiler.(6 marks) 7 (b) With neat sketches explain principle of working of four stroke petrol engine.(6 marks) 8 (a) Write a note on hydro-electric power plant.(6 marks) 8 (b) With neat sketch explain window air conditioner.(6 marks)

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