Which of the following laws of performance is not correctly matched?
Where N is speed and D is diameter.
Which of the following turbine is used for tidal power plant?
The available discharge and head of a proposed hydroelectric power plant are 350 m3/s and 30 m respectively. The turbine efficiency is 80% and speed is 280 rpm. What is the least number of machines required if you have to use Francsis turbine having a specific speed of 300?
[Take g = 10 m/s2 and 305/4 = 70]
P = g Q Hη
= 10 x 350 x 30 x 0.8 = 84000 kW
∴ P = 752 = 5625 kW
∴ Number of turbine
A turbine works under a head of 20 m and has maximum flow rate of 3 m3/s and a speed of 600 rpm. If it has to work in another plant under a head of 5 m, at what speed must the turbine run in order to attain approximately the same efficiency
The speed factor (speed ratio) of a Pelton turbine for its efficient operation lies in the range
Regulation of a pelton turbine is done by changing
A spear or needle is so arranged that it can move forward or backward thereby decreasing or increasing the annular area of the nozzle passage. This spear nozzle regulates the water flow through the nozzle.
The movable wicket gates of a reaction turbine are used to
Guide vanes or wicket gates are arranged inside the casing to form a number of flow passages between the casing and runner blades. They direct the water onto the runner at an angle appropriate to the design.
Which one of the following forms of draft tube will not improve the hydraulic efficiency of the turbine?
Purpose of draft tube is to convert kinetic energy into pressure energy, so option (a) wiil not be suitable for the intended purpose of draft tube.
The value of speed ratio for a Kaplan turbine is about
The specific speed of a fluid machine