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WorksheetsFluid Machinery Quiz 2 (Reaction Turbine)
Total questions: 15
Worksheet time: 8mins
Generally, the value of specific speed of Kaplan turbine is _____________ that of the Pelton turbine.
lower than
higher than
same as
unpredictable
The water from runner in reaction turbine is discharged into tail race through a draft tube which has ____________ cross sectional area.
constant
gradually decreasing
gradually increasing
uneven
__________ turbines are also called as parallel flow turbine.
Radial flow
Axial flow
Both radial flow and axial flow
None of the above
In which type of reaction turbine does the water flow in radial direction at the outer periphery of runner and leave at the centre in the direction parallel to the axis of rotation of runner?
Radial flow turbine
Axial flow turbine
Mixed flow turbine
All of the above
What is the formula to calculate specific speed (Ns) of a turbine rotating at a speed of 'N' rpm that develops the power of 'P' kW at the heat of 'H' m?
(Ns) = (√N x P) / (H)(5/4)
(Ns) = (2 √N x P) / (H)(5/4)
(Ns) = (N √P) / (H)(5/4)
(Ns) = (2N √P) / (H)(5/4)
The gates of aerofoil section in between the outer and inner ring of guide wheel are called as ________.
guide gates
guide vanes
scrolling gates
scrolling vanes
Which of the following components of reaction turbine increases the head on the turbine by an amount equal to the height of runner outlet above the tail race?
Scroll casing
Guide vanes
Moving vanes
Draft tube
As the reaction turbine works on the principle of impulse and reaction, it follows the law of ________.
impulse momentum
angular momentum
both a. and b.
none of the above
impulse momentum
angular momentum
both a. and b.
none of the above
In which type of turbine, the runner needs to be run full of water?
Impulse turbine
Reaction turbine
Both a. and b.
None of the above
In reaction turbine work is done_______________.
totally due to change in kinetic energy of jet
totally due to change in pressure head
mostly due to change in pressure head and small amount of work is due to change in kinetic energy
mostly due to change in kinetic energy and small amount of work is due to change in pressure head
The casing of radial flow reaction turbine is made of spiral shape, so that water may enter the runner__________
Variable acceleration
Constant acceleration
Variable velocity
Constant velocity
Which of following is inward radial flow reaction turbine?
Pelton wheel
Francis turbine
Axial turbine
Kaplan turbine
In Inward radial flow reaction turbine which is not required?
Runner
Air tight casing
Guide vanes
Breaking jet
_____________ allow the water to strike the vanes fixed on runner without shock at inlet
Casing
Guide vanes
Runner
Draft tube
Runner blades are made up of _____________
Cast steel
Cast iron
Wrought iron
Steel
