Q. The effective mean diameter of contact surfaces of a cone clutch is 76 mm. The semi-angle of the cone is 16 degree and the coefficient of friction is 0.3. Assuming uniform rate of wear, determine the torque required to produce slipping of the clutch, if the axial force applied is 200 N. The clutch connects an electric motor running at a uniform speed of 1200 r.p.m to a flywheel which is stationary. The moment of inertia of the flywheel is 0.25 kg-m?. Calculate the time required to attain the full speed and also the energy lost in slipping of the clutch.

Thirty kilograms of butane gas per minute burns with dry air inside a combustion chamber, giving products having the dry molar analysis of 11.0% carbon dioxide, 1.0% carbon monoxide, 3.5% oxygen, and 84.5% nitrogen. Calculate the minimum duct diameter, in mm, used to supply the combustion air at 1 bar and 27 deg C and at a flow velocity of 15 m/s.

The 12ft x 14 foot room illustration in figure 1.6a has an exterior wall at a surface temperature of 60°F, a window surface temperature of 40°F (double glazing on a cold day). The two interior wall surfaces are a temperature of 72°F. Determine the MRT sensation of a person standing in the center of the room. (See figure 1.6 below) Round your values to the nearsest hundreth decimal place (0.00).  You will need to upload your mathematical work in question 4.

A leather-faced cone clutch has a contact surface with a mean diameter of 15 in. and transinits 20 hy turning at 800 rpm. For a cone angle of 20 degrees and a coefficient of friction 0.30, determine the force required to keep the surface in contact. Ans. 121.5 lb.