Elements of Mechanical Engineering - May 2016

First Year Engineering (P Cycle) (Semester 1)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1(a) Explain the working of hydroelectric power paln with a neat sketch.(10 marks) 1(b) Distinguish between renewable and non-renewable sources of energy with suitable examples.(6 marks) 10(a) With a neat sketch, explain working a room air conditioner.(10 marks) 10(b) Distinguish between refrigeration and conditioning.(6 marks) 2(a) With a neat sketch,explain the working of a water tube boiler. Show the path of flue gases.(10 marks) 2(b) Draw a neat sketch of tempreature-Enthalpy diagram and indicate the following on it: Latent heat of evapotration, Amount of super heat.Sensible heat, Degree of superheat. Saturation tempreature.(6 marks) 3(a) Discuss the advantages of steam turbines over their prime movers.(10 marks) 3(b) Draw a neat sketch of a simple impulse water turbine indicating the parts.Explain its working.(6 marks) 4(a) Explain the working of four stroke petrol engine with neat sketches.(10 marks) 4(b) A 4-cylinder two stroke engine develop 30 k W at 2500 rpm. Calculate the diameter and stroke of each cylinder if the stroke to bore ratio is 1.5. The mean effective pressure on each piston is 6 bar and its mechanical efficiency is 80 percentage.(6 marks) 5(a) Explain the process of taper turning by swiveling if the compound rest with a neat sketch.(10 marks) 5(b) Differentiate between:
i) Drilling and reaming.
ii) Boring and counter boring.(6 marks) 6(a) Explain the Cartesian co-ordinate configuraton and spherical co-ordinate configuration robots with neat sketches.(10 marks) 6(b) Mention the advantages and limitationsof automation(6 marks) 7(a) Define composite materials. How are composites classified?(10 marks) 7(b) Mention the applications of composite materials in aerospace and automotive industries.(6 marks) 8(a) Explain the principle of are welding with a neat sketch.(10 marks) 8(b) List the different types of oxyacetylene flames and state their applications.(6 marks) 9(a) Explain the working principle of a vapour compression refigeration system with a neat sketch.(10 marks) 9(b) List desirable properties a refrigerant.(6 marks)