650 Important Hydraulics And Fluid Mechanics MCQ Question and Answer | PDF Free Download
1.The line of action of the buoyant force acts through the Centroid of the
- ASubmerged body
- BVolume of the floating body
- CVolume of the fluid vertically above the body
- DDisplaced volume of the fluid
2.The atmospheric pressure at sea level is
- A103 kN/m2
- B10.3 m of water
- C760 mm of mercury
- DAll of these
3.The Bernoulli's equation is based on the assumption that
- AThere is no loss of energy of the liquid flowing
- BThe velocity of flow is uniform across any cross-section of the pipe
- CNo force except gravity acts on the fluid
- DAll of the above
4.The Euler's equation for the motion of liquids is based upon the assumption that
- AThe fluid is non - viscous, homogeneous and incompressible
- BThe velocity of flow is uniform over the section
- CThe flow is continuous, steady and along the stream line
- DAll of the above
5.Euler's equation in the differential form for the motion of liquids is given by
- Adp/ρ + g.dz + v.dv = 0
- Bdp/ρ - g.dz + v.dv = 0
- Cρ.dp + g.dz + v.dv = 0
- Dρ.dp - g.dz + v.dv = 0
6.A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.
- AEqual to
- BLess than
- CMore than
- DNone of these
7.A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.
- AEqual to
- BLess than
- CMore than
- DNone of these
8.When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)
- A0.5 a. √2gH
- B0.707 a. √2gH
- C0.855 a. √2gH
- Da. √2gH
9.The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece)
- A0.855 a.√(2gH)
- B1.855 aH.√(2g)
- C1.585 a.√(2gH)
- D5.85 aH.√(2g)
10.The specific speed of turbine is defined as the speed of a unit
- AOf such a size that it delivers unit discharge at unit head
- BOf such a size that it delivers unit discharge at unit power
- COf such a size that it requires unit power per unit head
- DOf such a size that it produces unit horse power with unit head
11.The overall 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 the 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 dynamic viscosity of gases __________ with rise in temperature.
- ARemain unaffected
- BIncreases
- CDecreases
- DNone of these
13.The dynamic viscosity of the liquid __________ with rise in temperature.
- ARemain unaffected
- BIncreases
- CDecreases
- DNone of these
14.A fluid is said to be ideal, if it is
- AIncompressible
- BViscous and incompressible
- CInviscous and compressible
- DInviscous and incompressible
15.The pressure measured with the help of a pressure gauge is called
- AAtmospheric pressure
- BGauge pressure
- CAbsolute pressure
- DMean pressure
16.In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.
- ALess than
- BMore than
- CEqual to
- DNone of these
17.In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.
- ALess than
- BMore than
- CEqual to
- DNone of these
18.Rotameter is a device used to measure
- AAbsolute pressure
- BVelocity of fluid
- CFlow
- DRotation
19.Braking jet in an impulse turbine is used
- ATo break the jet of water
- BTo bring the runner to rest in a short time
- CTo change the direction of runner
- DNone of these
20.A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface.
- AH/3
- BH/2
- C2H/3
- D3H/4