1. In space ships, heat rejection to the surroundings is by radiation. A radiator in a space ship has an absorptivity αλ of 0.1 for 0 < λ < 2.5 µm, and 0.95 for λ > 2.5 µm. The surface is maintained at 600 K. What is the net heat flux from the surface when solar irradiation on the surface is 900 W/m2 ? Assume a sky temperature of 0 K, that the surface is diffuse and that the incident solar radiation is normal to the surface.

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.

Select any two (2) areas of applications of chain-drive. (clo4) a)-permanent lubrication necessary b)-hydraulic forklift truck operation c)-rigging and heavy moving materials d)-relatively high maintenance costs e)-costlier than belt drives