Aclosed piston-cylinder system contains 0.4 kg of methane that can be treated as an ideal gas. it undergoes isobaric expansion 100 kpa from 0.4m3 to 1.2 m3 . what is the change of temperature? multiple choice: 435 oc, 385 oc, -335 oc, 335 oc

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.