Question

Why does the process of energy extraction from a black hole take place with maximum efficiency when entropy remains constant?

Answer 1

The process of energy extraction from a black hole take place with maximum efficiency when entropy remains constant as black holes lose energy their radius decreases: this should lead to a decrease in the area of the black hole, therefore entropy should decrease. 

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Answer 2

A Black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it. The theory of general relativity predicts that a sufficiently compact Mass can deforms spacetime to form a black hole.The boundary of the region from which no escape is possible is called the event horizon Although the event horizon has an enormous effect on the fate and circumstances of an object crossing it, no locally detectable features appear to be observed