A reversible heat engine operates between two reservoirs at temperature 850 °C and 25 °C. The engine drives a reversible refrigerator which operates between reservoir at temperature 25 °C and -35 °C. The heat transfer to the engine is 2800 kJ and the net work output of the combined engine refrigerator plant is 400 kJ. a) From the information given, determine; 1. The efficiency of heat engine and COP of refrigerator ii. The net work transfer from engine, W 1 and net work transfer to refrigerator, ni. The heat transfer to the refrigerator iv. The net heat transfer to the reservoir at 25 °C