A three-cylinder car has pistons of 75 mm and cylinders of 75 mm. Find the percentage change in force required to drive the piston, when the lubricant warms from 25 deg C to 100 deg C. The dynamic viscosity of the lubricant at 25 deg C is 2 Ns/m^2 and at 100 deg C, it is 0.4 Ns/m^2.

3Medium10 marks

The maximum increase in temperature is expected to be 24 deg C after the construction of cement concrete pavement. If the expansion gap is of 2.0 cm design the spacing between the expansion and contraction joints. Assume allowable stress in concrete (tension) during initial period of curing = 0.8 kg/cm^2; coeff of thermal expansion of cement concrete 10 x 10^-6 per deg C, unit wt. of concrete = 2400 kg/m^3 and coeff of friction at interface as 1.3.

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