650 Important Hydraulics And Fluid Mechanics MCQ Question and Answer | PDF Free Download
1.Two pipe systems can be said to be equivalent, when the following quantities are same
- AFriction loss and flow
- BLength and diameter
- CFlow and length
- DFriction factor and diameter
2.The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to
- AHalf the depth
- BHalf the breadth
- CTwice the depth
- DTwice the breadth
3.The ratio of the inertia force to the elastic force is called
- AReynold's number
- BFroude's number
- CWeber's number
- DMach number
4.Buoyant force is
- AThe resultant force acting on a floating body
- BThe resultant force on a body due to the fluid surrounding it
- CEqual to the volume of liquid displaced
- DThe force necessary to maintain equilibrium of a submerged body
5.Specific speed for reaction turbines ranges from
- A0 to 4.5
- B10 to 100
- C80 to 200
- D250 to 300
6.A moving fluid mass may be brought to a static equilibrium position, by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called
- APascal’s law
- BArchimedes’s principle
- CD-Alembert’s principle
- DNone of these
7.The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called
- ANewton's law of motion
- BNewton's law of cooling
- CNewton's law of viscosity
- DNewton's law of resistance
8.For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called
- AContinuity equation
- BBernoulli’s equation
- CPascal’s law
- DArchimedes’s principle
9.When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called
- APascal’s law
- BArchimedes’s principle
- CPrinciple of flotation
- DBernoulli’s theorem
10.The specific weight of sea water is __________ that of pure water.
- ASame as
- BLess than
- CMore than
- DNone of these
11.The velocity 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
12.The Francis formula for the discharge over Cipoletti weir is
- A1.84 LH1/2
- B1.84 LH
- C1.84 LH3/2
- D1.84 LH5/2
13.In order to avoid cavitation in centrifugal pumps
- AThe suction pressure should be high
- BThe delivery pressure should be high
- CThe suction pressure should be low
- DThe delivery pressure should be low
14.The gross or total head of the turbine is the ___________ of the water levels at the head race and tail race.
- ASum
- BDifference
- CProduct
- DNone of these
15.The Specific weight of sea water is more that of pure water because it contains
- ADissolved air
- BDissolved salt
- CSuspended matter
- DAll of the above
16.Bulk modulus of a fluid is the ratio of
- AShear stress to shear strain
- BIncrease in volume to the viscosity of fluid
- CIncrease in pressure to the volumetric strain
- DCritical velocity to the viscosity of fluid
17.The ratio of the inertia force to the __________ is called Euler's number.
- APressure force
- BElastic force
- CSurface tension force
- DViscous force
18.In a centrifugal pump, the liquid enters the pump
- AAt the top
- BAt the bottom
- CAt the canter
- DFrom sides
19.The maximum discharge over a broad crested weir is
- A0.384 Cd × L × H1/2
- B0.384 Cd × L × H3/2
- C1.71 Cd × L × H1/2
- D1.71 Cd × L × H3/2
20.For measuring flow by a Venturimeter, it should be installed in
- AVertical line
- BHorizontal line
- CInclined line with flow downward
- DIn any direction and in any location