Adesktop computer is to be cooled by a fan whose flow rate is 0.34 m3 /min. determine the mass flow rate of air through the fan at an elevation of 3400 m where the air density is 0.7 kg/m3 . also, if the average velocity of air is not to exceed 110 m/min, determine the diameter of the casing of the fan. (page 215).

On a average work day more than work place firs are reorted

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented