Question

The water from runner in reaction turbine is discharged into tail race through a draft tube which has ____________ cross sectional area.
1 point
a. constant
b. gradually decreasing
c. gradually increasing
d. uneven​

Answer 1

Answer: c. gradually increasing

Explanation:

In reaction turbine water enters a runner under pressure with a certain speed head. The water pressure is gradually converted into a speed head as the water passes over the runner. This pressure is reduced by atmospheric pressure and kinetic energy changes. The rotation of the athlete and the production of machine work are the result of force action.

As water flows under pressure over the runner, over the atmosphere it is necessary that the runner should run full of water. This water from the runner is pumped out of the tail race through a closed-loop closure tube of a cross-sectional area called the repair tube.

Hence, the cross section of the draft tube gradually increases in reaction turbine.

#SPJ3