Question Paper: Design of Mechanical System Question Paper - December 2016 - Mechanical Engineering (Semester 8) - Mumbai University (MU)
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Design of Mechanical System - December 2016

MU Mechanical Engineering (Semester 8)

Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Solve any four questionQ.6(a,b,c,d,e,f)

1(a) Give the basic constructional details of different types ropes EOT crane. And what do you understand by 6×37 rope? 5 marks

1(b) Explain different types of take-up arrangement used in belt conveyors. 5 marks

1(c) What are the different types of piston rings? Explain the functions of then. 5 marks

1(d) What are the materials used for the following I.C. Engine components. Justify
i) Cylinder block ii) Crank shaft iii) Connecting rod iv)Gudgeon pin
5 marks

1(e) Explain with diagrams, how the structure and ray diagrams are different from each other in multi-speed gear box. 5 marks

1(f) What do you means by morphology of mechanical design? Explain any two phase of it. 5 marks

2(a) A 20°C troughing belt conveyor has the following data:
Material conveyed : Coal (from mine)
Inclination of conveyor : 10°
Lump size : 80mm
Capacity: 400 tph
Length of conveyor : 120m Design the conveyor for
i) Motor power capacity ii) Belt width iii) No.of troughing idlers and return idlers iv) Belt drive pulley
5 marks

2(b) What are the different types of gear pumps. Explain with sketch, the working of any one of them. 5 marks

3(a) A four stroke, single cylinder, water cooled, vertical, petrol engine has the following data:
Brake power=50kW
Compression ratio=7
Mass of reciprocating parts= 1.5kg
Over speed = 2400 rpm
Speed = 2000 rpm Design the following components of I.C. Engine and sketch them with dimensions. i) Crank shaft ii) Crank pin iii) Main bearings.
5 marks

3(b) Explain how the design approach of petrol and diesel engines differs from each other. 5 marks

4(a) The following specifications refers to an EOT Crane:
Application : Class-II
Load to be lifted: 120kN
Hoisting speed: 5m/min
Maximum lift : 15 m a)Select suitable type and size of wire rope for an expected life of 12 months.
5 marks

4(b) Design the following components of EOT crane.
i) Hook ii) Cross-piece of the hook iii) Shackle plate iv) Rope drum
5 marks

5 The Centrifugal pump has to work with the following specifications:
Static suction head : 3m
Static delivery head : 8m
Length of suction pipe : 7m
Length of delivery pipe : 50m
Discharge : 850 lpm
Working fluid : water at 30°C The pump is directly connected to an elecric motor. Design the pump completely for pumping water.
5 marks

6(a) Find the rpm values and diameter range served by each rpm in Geometric, Harmonic and Logarithmic Progressions and compare them based on the following conditions:
Minimum speed, n1=30 rpm
Maximum speed, n2 =400 rpm
Number of speed steps, z=12
Cutting speed, v=20m/min And draw the gearing (kinematic) diagram as per the Geometric Progression.
5 marks

6(b) Explain the design methodology and Optimum Design. 5 marks

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