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    Question Paper - Design of Machine Elements 2 Oct-19-October - 2019

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    Chandu
    This document is a past exam paper for an 8th semester mechanical engineering design course. It contains 9 questions across 3 sections (A, B, C) testing knowledge of machine elements design. The questions cover topics like design of clutches, hydrodynamic bearings, spur gears, bevel gears, connecting rods, belts, and pressure vessels. Students are instructed to answer 6 of the 9 questions, with Part A questions worth 15 marks each, Part B questions worth 15 marks each, and Part C questions worth 20 marks each.

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    Question Paper - Design of Machine Elements 2 Oct-19-October - 2019

    Uploaded by

    Chandu
    33 views2 pages
    This document is a past exam paper for an 8th semester mechanical engineering design course. It contains 9 questions across 3 sections (A, B, C) testing knowledge of machine elements design. The questions cover topics like design of clutches, hydrodynamic bearings, spur gears, bevel gears, connecting rods, belts, and pressure vessels. Students are instructed to answer 6 of the 9 questions, with Part A questions worth 15 marks each, Part B questions worth 15 marks each, and Part C questions worth 20 marks each.

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    Question paper - Design of Machine Elements 2 Oct-19-October_2019

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    This document is a past exam paper for an 8th semester mechanical engineering design course. It contains 9 questions across 3 sections (A, B, C) testing knowledge of machine elements design. The questions cover topics like design of clutches, hydrodynamic bearings, spur gears, bevel gears, connecting rods, belts, and pressure vessels. Students are instructed to answer 6 of the 9 questions, with Part A questions worth 15 marks each, Part B questions worth 15 marks each, and Part C questions worth 20 marks each.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    33 views2 pages

    Question Paper - Design of Machine Elements 2 Oct-19-October - 2019

    Uploaded by

    Chandu
    This document is a past exam paper for an 8th semester mechanical engineering design course. It contains 9 questions across 3 sections (A, B, C) testing knowledge of machine elements design. The questions cover topics like design of clutches, hydrodynamic bearings, spur gears, bevel gears, connecting rods, belts, and pressure vessels. Students are instructed to answer 6 of the 9 questions, with Part A questions worth 15 marks each, Part B questions worth 15 marks each, and Part C questions worth 20 marks each.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    A H192017 Pages: 2

    Reg No.:_______________ Name:__________________________


    APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
    EIGHTH SEMESTER B.TECH DEGREE EXAMINATION(S), OCTOBER 2019
    Course Code: ME402
    Course Name: Design of Machine Elements-II
    Max. Marks: 100 Duration: 3 Hours
    Use of design data book is permitted
    Missing data may be suitably assumed
    PART A
    Answer any two full questions, each carries 15 marks. Marks

    1 Design a dry single plate clutch having both sides effective to transmit 19 kW at (15)
    1500 rpm. The ratio of mean radius to radial width is 4.5. The axial thrust is
    provided by 6 springs. Take, coefficient of friction = 0.2 and allowable pressure =
    0.245 M Pa. Assume, spring index, C = 6, shear stress = 420 MPa and G = 84
    GPa. Find (i) mean radius and width of friction surfaces, (ii) dimensions of clutch
    plate and (iii) dimensions of springs.
    2 Design a full hydrodynamic journal bearing operating at 1200 rpm and carrying a (15)
    load of 6 k N. The journal material is hardened steel and bearing is of babbit
    material. The bearing is lubricated with SAE 30 oil and the operating temperature
    of oil is 69 0 C. Assume ambient temperature as 300.
    3 a) Explain the significance of bearing characteristic number in the design of sliding (5)
    contact bearing.
    b) Explain the mechanism of fluid film lubrication. (5)
    c) What is Sommerfeld number? Explain its significance in the design of (5)
    hydrodynamic bearing.
    PART B
    Answer any two full questions, each carries 15 marks.
    4 A compressor receives power through a pair of spur gears. The compressor shaft (15)
    runs at 350 rpm while the motor shaft runs at 1450 rpm, delivering 40 kW power.
    The power transmission is with moderate shock and the drive is to operate 10
    hours per day. Pinion is made of steel C-40 heat treated and gear is made of cast
    steel. Design the spur gear set.
    5 A pair of straight tooth bevel gears at right angles is to transmit 5 kW at 1200 rpm (15)
    of the pinion. The diameter of the pinion is 80 mm and the speed reduction is
    3.5:1. The tooth form is 20o full depth involute. Both the pinion and gear are

    Page 1of 2
    A H192017 Pages: 2

    made of cast iron with allowable stress of 55 MPa. Determine module and face
    width from the standpoint of strength. And also check the design from the
    standpoint of dynamic load and wear.
    6 a) Derive Lewis Equation for beam strength of a gear tooth and also state the (7)
    assumptions.
    b) What is pressure angle? Discuss its significance. (4)
    c) What are the commonly used tooth profiles for spur gear? Explain the (4)
    characteristics of each.
    PART C
    Answer any two full questions, each carries 20 marks.
    7 a) Design a connecting rod for four stroke petrol engine with the following data; (16)
    Diameter of piston-8.8 cm, Stroke-12.5 cm, Weight of reciprocating parts-1.6 Kg,
    Length of connecting rod (centre to centre)-30 cm, RPM-2200 with possible over
    speed of 3000, Compression ratio-6.8:1, Maximum explosion pressure-35
    Kg/cm2. The maximum allowable bearing pressure at big end and the small end
    are respectively 12 N/mm2 and 16 N/mm2. The density of material of the rod may
    be taken as 8000 kg/m3 and allowable stress in the bolts as 80 N/mm2 and in the
    cap as 75 N/mm2.
    b) What is the effect of centrifugal tension in belt on power transmission? (4)
    8 a) Enumerate the advantages and disadvantages of a flat belt drive. (4)
    b) Design a V-belt drive for the following specifications. Power transmitted is 22 (16)
    kW, speed of the driving wheel is 1450 rpm, speed of the driven wheel is 400
    rpm, centre distance should not exceed 2500 mm, and the service of the
    equipment is 15 hrs/day.
    9 a) Differentiate between a thin and thick pressure vessel. (4)
    b) Explain the various types of ends used for pressure vessel giving practical (4)
    application of each.
    c) A cast iron cylinder of internal diameter 200 mm and thickness 50 mm is (12)
    subjected to a pressure of 5 MPa. Calculate the tangential and radial stresses at
    the inner, middle (radius-125 mm) and outer surfaces.
    ****

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