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The surge tank controls the water when the load on the turbine is ________

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The surge tank controls the water when the load on the turbine is ________

(a) Equal

(b) Decreased

(c) Increased

(d) Not present

The question was asked in an international level competition.

I would like to ask this question from Classification of Hydro-Plant topic in section Hydro Electric Power Plant of Energy Engineering

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Best answer
The correct option is (b) Decreased

The best I can explain: The surge tank controls the water when the load on the turbine decreases. The excess water is stored in the surge tank and hence the pressure variations in the penstock are taken care of preventing water hammer.

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