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%

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

Which of the following is an easy way to remember the modified “x” tire rotation? a. nondrive wheels straight, cross the drive wheels b. drive wheels straight, cross the nondrive wheels c. drive wheels crossed, nondrive wheels straight d. drive wheels crossed, nondrive wheels crossed

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.