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0800IET201 122003

distance is 4m. The smaller pulley is of 500 mm diameter, and the coefficient of
friction between belt and pulley is 0.3. Calculate the stress in the belt?

Module 2
A cam of base circle radius 50 mm is to operate a roller follower of 20mm
diameter. The follower is to have SHM. The follower axis has an offset of
15mm towards right. Draw the profile of the cam for a lift of 40mm. Angle of
ascent =60°, angle of dwell=40°, and angle of descent =90°, which is followed
by dwell again?
A porter governor has all four arms 300 mm long. The upper arms are pivoted
on the axis of rotation and the lower arms are attached to the sleeve at a distance
of 35 mm from the axis. The mass of each ball and sleeve are 7 kg and 54 kg
respectively. If the extreme radii of rotation of the balls are 200 mm and 250
mm, determine the range of speed of the governor?

Module 3
Design a double riveted butt joint with two cover plates for longitudinal seam of
a boiler shell, 0.75 m diameter, to carry a maximum steam pressure of 1.05
N/mm”. The allowable stresses are 35 N/mm’ for tension, 28 N/mm? for shear
and 52.5N/mm’ for crushing. Efficiency of the joint is 75%.
A rectangular steel plate is welded as a cantilever to a vertical column and
supports a load 60 KN as shown. Determine the weld size if the allowable shear

stress is not to exceed 140 MPa? All dimension in mm

Module 4

A compressor running at 300 rpm is driven by 15 kW, 1200rpm motor through a
set of 14.5°, full depth gears. The motor pinion is to be C-30 forged steel and the
driven gear is to be cast steel. Assuming medium shock condition determine the
module, the face width, and the number teeth on each gear. Check the gears for
dynamic load?

Two helical gears are used in a speed reducer. The rated power of the speed

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