A refrigeration unit has a COP of 4 and extracts 10 kJ of heat from the cold reservoir. If this machine works as a heat pump, how much heat will it deliver to the environment?
(A) 2 kJ
(B) 2.5 kJ
(C) 12.5 kJ
(D) 25 kJ
71. When a hydrocarbon fuel burns in deficit air, Orsat analyzer will show the presence of following gases in the engine exhaust
(A) 2 2 2 CO N and O
(B) 2 2 2 CO,CO N and O
(C) 2 2 CO,CO and N
(D) 2 2 2 2 CO CO, N ,O and H O