In an open channel the discharge corresponding to critical depth is
A.Minimum
B.Maximum
C.Zero
D.Average
E.None of the above
Category: Fluid Mechanics and Hydraulic Machines Mcqs
In order that the water shall never rise more than 100 cm above the crest for a discharge of 5 cube metres per second, the length of weir will be
A.1 metre
B.2.5 metres
C.2.49 metres
D.2.51 metres
E.2.00 metres
The pressure centre is
A.At the centroid of the submerged area
B.The centroid of the pressure prism
C.Independent of the orientation of the area
D.A point on the line of action of the resultant force
E.Always above the centroid of area
In which of the following cases it is possible for flow to occur from low pressure to high pressure?
A.Flow through a converging section
B.Adiabatic flow in a horizontal pipe
C.Flow of liquid in a vertical pipe
D.Flow of air downward in a pipe
E.None of the above
In case the resultant of all the forces acting on a dam passes outside the base, the dam would overturn unless
A.It can resist tensile stress
B.Additional weight is provided on the body of the dam
C.Friction pads are provided
D.Anchor blocks are provided
E.Coefficient of driction of the material is increased
An ideal fluid is
A.Similar to a perfect gas
B.Frictionless and incompressible
C.One which obeys Newton’s law of viscosity
D.One which satisfies continuity equation
E.One which flows through pipes with least friction
Anchor blocks are provided to hold the pipe line so as to
A.Prevent the pipe line sliding down the hill
B.Control the direction of expansion
C.Resist the unbalanced hydrostatic forces at a change of direction of the pipe line
D.Prevent movement of the pipe line on account of vibration or water hammer pressures
E.All of the above
A most economical channel section is one which for a given cross-section area
A.Has maximum velocity of fluid
B.Has maximum discharge
C.Has maximum depth of fluid flowing
D.Has maximum wetted perimeter
E.Has maximum hydraulic radius
Which one of the following is not usually considered particular advantage of a Buttress dam?
A.Economy in use of concrete
B.Less uplift force
C.The power house and switchyard etc. can be located between the buttresses
D.Because of thin members, the volume changes are significant
E.Due to thin section, the problem of temperature control is minimised.
Out ward radial flow turbines
A.Are impulse type
B.Are reaction type
C.Are partly impulse partly reaction
D.May be impulse or reaction type
E.None of the above
