The total power output in a hydroelectric installation depends upon which of the following?

1.The total water flow

2.The electrical conductivity of water

3.The atmospheric temperature

4.The vertical distance through which the water falls

A1, 2 & 3 only

B2 & 3 only

C1 & 4 only ✓ Correct

D1, 2 & 4 only

Correct answer: (C) 1 & 4 only

Explanation

Total power from a hydro plant depends on the water flow and the vertical fall.

Statement 1 is right, because a greater volume of flowing water carries more energy.

Statement 4 is right, because a larger head, the height of the fall, raises the energy per unit water.

Statement 2 is wrong, since the electrical conductivity of water has no bearing on power output.

Statement 3 is wrong, as atmospheric temperature does not determine the generated power.

Power equals the product of flow rate, head, gravity and the turbine generator efficiency.

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