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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