A polyamide conveyor belt is required to transport crushed rocks at a distance of 10 ft at a speed of 3 ft/sec. The maximum weight of the cruched rock on the belt is 150 lb and the coefficient of static friction between the belt and the rock is 0.12. Design a flat belt drive. Assume a gearbox reduces the speed from a 10-hp electric motor running at 1750 rpm to the belt drive.

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature

Atmospheric air has a temperature (dry bulb) of 80° f and a wet bulb temperature of 60° f when the barometric pressure is 14.696 psia. determine the specific humidity, grains/lb dry air. a. 11.4 c. 55.8 d. 22.5 b. 44.1