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In which wave machine instead of compressing air, the water itself is pressurized?

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In which wave machine instead of compressing air, the water itself is pressurized?

(a) High level reservoir wave machine

(b) Dolphin type wave generator

(c) Hydraulic accumulator

(d) Float wave power conversion device

The question was posed to me in class test.

Question is taken from Wave Energy topic in chapter Ocean Energy & Geothermal Energy of Energy Engineering

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The correct answer is (c) Hydraulic accumulator

The best explanation: Hydraulic accumulator wave machines, instead of compressing air, the water itself is pressurized and stored in a high pressure accumulator or pumped to a high level reservoir, from which it flows through a water turbine electric generator.

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