Chapter 10 Flashcards
Pelton wheels generally are used in plants that have heads…
Higher than 850 feet
Impulse turbines are usually installed with a horizontal shaft and
One jet to a wheel
Sometimes two or more jets may be used on one wheel in order to…
Increase the power
It is important that this type of wave be kept within reasonable limits to prevent the penstock from being damaged or ruptured
Water hammer
Some installations have an auxiliary needle nozzle below that main nozzle which is used to
Control water flow during sudden load changes, it reduces water flow
A reaction turbine is one which there is only a partial drop in pressure in a blank blank. The remainder of the pressure drop taking place where
Stationary nozzle / rotating runner
The amount of pressure showing on the gage in a turbine runner is a good indication of the degree of…
Effectiveness of the seal rings
The overall effect of the draft tube is to increase the…
Effective head of the turbine
The speed of revolutions per min at which a model of the type in question would operate with a runner of such a size to deliver one horsepower under a head of one foot
Specific speed
What kind of impeller has the blades adjust automatically maintaining the best efficiency for wicket gate position and also for variations of head
Kaplan turbine
What would be a minor problem for a turbine that operated at constant load with no variation in the effective head
Cavitation
The Kaplan turbine is used primarily at low heads up to about…
50 feet
