650 Important Hydraulics And Fluid Mechanics MCQ Question and Answer | PDF Free Download
1.The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is
- ADirectly proportional to (radius)2
- BInversely proportional to (radius)2
- CDirectly proportional to (radius)4
- DInversely proportional to (radius)4
2.The pressure in Pascal’s at a depth of 1 m below the free surface of a body of water will be equal to
- A1 Pa
- B91 Pa
- C981 Pa
- D9810 Pa
3.When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as
- ANarrow-crested weir
- BBroad-crested weir
- COgee weir
- DSubmerged weir
4.The sheet of water flowing over a notch or a weir is known as
- ASill or crest
- BNappe or vein
- COrifice
- DNone of these
5.The upper surface of a weir over which water flows is known as
- Avein
- Bnappe
- Csill
- Dweir top
6.The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if
- AThe area is horizontal
- BThe area is vertical
- CThe area is inclined
- DAll of the above
7.The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
- ASlow speed with radial flow at outlet
- BMedium speed with radial flow at outlet
- CHigh speed with radial flow at outlet
- DHigh speed with axial flow at outlet
8.The surface tension of mercury at normal temperature compared to that of water is
- AMore
- BLess
- CSame
- DMore or less depending on size of glass tube
9.The viscosity of water is __________ than that of mercury.
- AHigher
- BLower
- CSame as
- DNone of these
10.A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)
- A4wd/σ cosα
- Bσ cosα/4wd
- C4σ cosα/wd
- Dwd/4σ cosα
11.The hydraulic efficiency of a reaction turbine, is the ratio of
- APower produced by the turbine to the energy actually supplied by the turbine
- BActual work available at the turbine to energy imparted to the wheel
- CWork-done on the wheel to the energy (or head of water) actually supplied to the turbine
- DNone of the above
12.The intensity of pressure at any point, in a liquid, is
- ADirectly proportional to the area of the vessel containing liquid
- BDirectly proportional to the depth of liquid from the surface
- CDirectly proportional to the length of the vessel containing liquid
- DInversely proportional to the depth of liquid from the surface
13.Geometric similarity is said to exist between the model and the prototype, if both of them
- AHave identical velocities
- BAre equal in size and shape
- CAre identical in shape, but differ only in size
- DHave identical forces
14.Dynamic similarity exists when the model and the prototype have the same
- ALength scale ratio and time scale ratio
- BLength scale ratio and velocity scale ratio
- CLength scale ratio, time scale ratio and velocity scale ratio
- DLength scale ratio, velocity scale ratio and force scale ratio
15.Kinematic similarity is said to exist between the model and the prototype, if both of them
- AHave identical velocities
- BAre equal in size and shape
- CAre identical in shape, but differ only in size
- DHave identical forces
16.The jet ratio is defined as the ratio of the
- ADiameter of jet to the diameter of Pelton wheel
- BVelocity of jet to the velocity of Pelton wheel
- CDiameter of Pelton wheel to the diameter of jet
- DVelocity of Pelton wheel to the velocity of jet
17.The flow ratio of Francis turbine is defined as the ratio of the
- AVelocity of flow at inlet to the theoretical jet velocity
- BTheoretical velocity of jet to the velocity of flow at inlet
- CVelocity of runner at inlet to the velocity of flow at inlet
- DNone of the above
18.Operation of McLeod gauge used for low pressure measurement is based on the principle of
- AGas law
- BBoyle's law
- CCharles law
- DPascal's law
19.A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity
- AOne-half
- BOne-third
- CTwo-third
- DThree-fourth
20.In a centrifugal pump casing, the flow of water leaving the impeller, is
- ARectilinear flow
- BRadial flow
- CFree vortex motion
- DForced vortex