Apower cycle receives energy qh by heat transfer from a hot reservoir at th 5 12008r and rejects energy qc by heat transfer to a cold reservoir at tc 5 4008r. for each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible.
(a) qh 5 900 btu, wcycle 5 450 btu
(b) qh 5 900 btu, qc 5 300 btu
(c) wcycle 5 600 btu, qc 5 400 btu
(d) thermo efficiency = 70%

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.

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