650 Important Hydraulics And Fluid Mechanics MCQ Question and Answer | PDF Free Download
1.The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream
- AKeeps on increasing
- BKeeps on decreasing
- CRemain constant
- DMay increase/decrease
2.The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach)
- A(2/3) Cd × L.√2g [H1 - Ha]
- B(2/3) Cd × L. √2g [H13/2 - Ha3/2]
- C(2/3) Cd × L.√2g [H12 - Ha2]
- D(2/3) Cd × L. √2g [H15/2 - Ha5/2]
3.The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.
- A0.34 times
- B0.67 times
- C0.81 times
- D0.95 times
4.Which of the following meters is not associated with viscosity?
- ARed wood
- BSay bolt
- CEngler
- DOrsat
5.A flow in which __________ force is dominating over the viscosity is called turbulent flow.
- AElastic
- BSurface tension
- CViscous
- DInertia
6.An orifice is said to be large, if
- AThe size of orifice is large
- BThe velocity of flow is large
- CThe available head of liquid is more than 5 times the height of orifice
- DThe available head of liquid is less than 5 times the height of orifice
7.The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is
- ASlow speed pump with radial flow at outlet
- BMedium speed pump with radial flow at outlet
- CHigh speed pump with radial flow at outlet
- DHigh speed pump with axial flow at outlet
8.A channel is said to be of most economical cross-section, if
- AIt gives maximum discharge for a given cross-sectional area and bed slope
- BIt has minimum wetted perimeter
- CIt involves lesser excavation for the designed amount of discharge
- DAll of the above
9.The discharge in an open channel corresponding to critical depth is
- AZero
- BMinimum
- CMaximum
- DNone of these
10.Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the
- AForce of adhesion
- BForce of cohesion
- CForce of friction
- DForce of diffusion
11.Which of the following pump is suitable for small discharge and high heads?
- ACentrifugal pump
- BAxial flow pump
- CMixed flow pump
- DReciprocating pump
12.A flow whose streamline is represented by a straight line, is called __________ dimensional flow.
- AOne
- BTwo
- CThree
- DFour
13.According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)
- Aflv²/2gd
- Bflv²/gd
- C3flv²/2gd
- D4flv²/2gd
14.The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)
- A(1 + cos φ)/2
- B(1 - cos φ)/2
- C(1 + sin φ)/2
- D(1 - sin φ)/2
15.Coefficient of velocity is defined as the ratio of
- AActual velocity of jet at vena contracta to the theoretical velocity
- BArea of jet at vena contracta to the area of orifice
- CActual discharge through an orifice to the theoretical discharge
- DNone of the above
16.A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow.
- AIncompressible
- BCompressible
- CViscous
- DNone of these
17.If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by
- AH = Hg/hf
- BH = Hg × hf
- CH = Hg + hf
- DH = Hg – hf
18.The flow which neglects changes in a transverse direction is known as
- AOne dimensional flow
- BUniform flow
- CSteady flow
- DTurbulent flow
19.The power transmitted through the pipe is maximum when the head lost due to friction is equal to
- AOne-fourth of the total supply head
- BOne-third of the total supply head
- COne-half of the total supply head
- DTwo-third of the total supply head
20.The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid)
- A4μvl/wd²
- B8μvl/wd²
- C16μvl/wd²
- D32μvl/wd²