An impulse turbine
A.Always operates submerged
B.Makes use of a draft tube
C.Is most suited for low head installations
D.Converts pressure head into velocity head throughout the vanes
E.Operates by initial complete conversion to kinctic energy
Category: Fluid Mechanics and Hydraulic Machines Mcqs
In Buttress dam, too flat a slope causes
A.Excessive tensile stress on upstream face
B.A very high inclined stress at the heel
C.Overloading of buttress sections
D.Increased tendency to overturning
E.Excessive tensile stresses in the foundation and the body of the dam
Rocks that undergo notable expansion without flow due to preence of clay minerals, are known as
A.Squeezing rocks
B.Moderately jointed rocks
C.Seamy rocks
D.Schistos rocks
E.Swelling rocks
If the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, the flow is said to be
A.Uniform flow
B.Steady flow
C.Turbulent flow
D.Laminar flow
E.None of the above
Which one is different from the others?
A.Axial flow impeller
B.Mixed flow impeller
C.Warped vane impeller
D.Open impeller
E.Shrouded impeller
The miaimum thickness of boundary layer in a pipe of radius R is
A.0.1 R
B.0.22 R
C.0.5 R
D.R
In a turbine installation gross head is defined as
A.The difference of level between the head race and the tail race
B.The difference of level between reservoir and downstream
C.The difference of head between axis of turbine to discharge stream level
D.The head actually used in developing power
E.None of the above
The Reynolds number for flow of 0.3 m3/s of oil sp. Gr. 0.86,
A.29.2
B.292
C.2920
D.22930
E.None of the above
The line of action of the buoyant force acts through the
A.Centre of gravity of any submerged body
B.Centroid of gravity of any floating body
C.Centroid of the displaced volume of fluid
D.Centroid of the volume of fluid vertically above the body
E.Centroid of the horizontal projection of the body
When power is transmitted through a considerable distance by means of water under pressure, the maximum power is transmitted when
A.Frictional loss of head is one third of the total head supplied
B.Frictional loss of head is half of the total head supplied
C.Frictional loss of head is 10% of the total head
D.Eficiency of transmission is 75%
E.Loss in transmission is 17.7%.
