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11192017 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.
Derive Lewis Equation for beam strength of a gear tooth and also state the
assumptions.
What is pressure angle? Discuss its significance.
What are the commonly used tooth profiles for spur gear? Explain the
characteristics of each.
PART C

Answer any two full questions, each carries 20 marks.
Design a connecting rod for four stroke petrol engine with the following data;
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/cm’. The maximum allowable bearing pressure at big end and the small end
are respectively 12 N/mm? and 16 N/mm/?. The density of material of the rod may
be taken as 8000 kg/m? and allowable stress in the bolts as 80 N/mm? and in the
cap as 75 N/mm?.
What is the effect of centrifugal tension in belt on power transmission?
Enumerate the advantages and disadvantages of a flat belt drive.
Design a V-belt drive for the following specifications. Power transmitted is 22
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.
Differentiate between a thin and thick pressure vessel.
Explain the various types of ends used for pressure vessel giving practical
application of each.
A cast iron cylinder of internal diameter 200 mm and thickness 50 mm is
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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