650 Important Hydraulics And Fluid Mechanics MCQ Question and Answer | PDF Free Download
1.The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
- ALess than
- BMore than
- CEqual to
- DNone of these
2.The flow in a pipe or channel is said to be non-uniform when
- AThe liquid particles at all sections have the same velocities
- BThe liquid particles at different sections have different velocities
- CThe quantity of liquid flowing per second is constant
- DEach liquid particle has a definite path
3.The force present in a moving liquid is
- AInertia force
- BViscous force
- CGravity force
- DAll of these
4.Which of the following turbine is preferred for 0 to 25 m head of water?
- APelton wheel
- BKaplan turbine
- CFrancis turbine
- DNone of these
6.The maximum number of jets, generally, employed in an impulse turbine without jet interference are
- ATwo
- BFour
- CSix
- DEight
7.Froude's number is the ratio of inertia force to
- APressure force
- BElastic force
- CGravity force
- DSurface tension force
8.Reynold's number is the ratio of inertia force to
- APressure force
- BElastic force
- CGravity force
- DViscous force
9.The unit of dynamic viscosity in S.I. units is
- AN-m/s²
- BN-s/m²
- CPoise
- DStoke
10.When a liquid is flowing through a pipe, the velocity of the liquid is
- AMaximum at the centre and minimum near the walls
- BMinimum at the centre and maximum near the walls
- CZero at the centre and maximum near the walls
- DMaximum at the centre and zero near the walls
11.According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.
- AEqual to
- BDirectly proportional
- CInversely proportional
- DNone of these
12.Which of the following is an example of laminar flow?
- AUnderground flow
- BFlow past tiny bodies
- CFlow of oil in measuring instruments
- DAll of these
13.Power required to drive a centrifugal pump is directly proportional to _________ of its impeller.
- ADiameter
- BSquare of diameter
- CCube of diameter
- DFourth power of diameter
14.A large Reynold number is indication of
- ASmooth and streamline flow
- BLaminar flow
- CSteady flow
- DHighly turbulent flow
15.The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately
- A5 mm
- B10 mm
- C20 mm
- D30 mm
16.Motion of a liquid in a volute casing of a centrifugal pump is an example of
- ARotational flow
- BRadial
- CForced spiral vortex flow
- DSpiral vortex flow
17.The flow of water through the hole in the bottom of a wash basin is an example of
- ASteady flow
- BUniform flow
- CFree vortex
- DForced vortex
18.A hydraulic press is a device used
- ATo store pressure energy which may be supplied to a machine later on
- BTo increase the intensity of pressure of water by means of energy
- CTo lift larger load by the application of a comparatively much smaller force
- DAll of the above
19.A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called
- ASteady flow
- BUniform flow
- CStreamline flow
- DTurbulent flow
20.When a body floating in a liquid, is displaced slightly, it oscillates about
- AC.G. of body
- BCenter of pressure
- CCenter of buoyancy
- DMetacentre