Using K-maps, find the minimum POS of the following: a. f(A, B, C, D) = ∑ m(0, 1, 2, 4, 6, 7, 8, 9, 13, 15) b. f(A, B, C, D) = π M(1, 2, 4, 10, 11, 14) c. f(A, B, C, D) = ∑ m(0, 1, 5, 12, 14, 15) + ∑ d(2, 7, 8, 13) d. f(A, B, C, D) = π M(3, 8, 9, 14) . π D(0, 1, 4, 5, 10, 11)

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.