Apower cycle operating at steady state receives energy by heat transfer at a rate q_h at t_h = 1800 k and rejects energy by heat transfer to a cold reservoir at a rate q_c at t_c = 600 k. for each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible.
a. q._h = 500 kw, q._c = 100 kw
b. q._h = 500 kw, w._cycle = 250 kw, q._c = 200 kw
c. w_cycle = 350 kw, q._c = 150 kw
d. q._h = 500 kw, q._c = 200 kw