Hydraulics And Fluid Mechanics In Me - Study Mode

[#241] In a reaction turbine, the draft tube is used
Correct Answer

(C) To increase the head of water by an amount equal to the height of the runner outlet above the tail race

Explanation

Solution: In a reaction turbine, the draft tube is used: To increase the head of water by an amount equal to the height of the runner outlet above the tail race: The draft tube helps in converting the velocity head of the water exiting the turbine into pressure head, thus increasing the effective head and improving the efficiency of the turbine. This function of the draft tube ensures that the water exiting the turbine maintains a higher pressure, which enhances the turbine's performance. The draft tube does not run the turbine full, prevent air from entering, or transport water downstream.

[#242] In reaction turbine, draft tube is used
Correct Answer

(B) To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

[#243] The flow rate in gear pump
Correct Answer

(C) More or less remains constant with increase in pressure

[#244] The increase of temperature results in
Correct Answer

(D) Decrease in viscosity of liquid

[#245] Runaway speed of a hydraulic turbine is
Correct Answer

(C) The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open