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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 11
Q1 | The power transmitted through the pipe is maximum when the head lost due to friction is equal to
- One-fourth of the total supply head
- One-third of the total supply head
- One-half of the total supply head
- Two-third of the total supply head
Q2 | Falling drops of water become spheres due to the property of
- Adhesion
- Cohesion
- Surface tension
- Viscosity
Q3 | The difference of pressure between the inside and outside of a liquid drop is
- p = T × r
- p = T/r
- p = T/2r
- p = 2T/r
Q4 | A venturi -flume is used to measure
- Pressure of liquid
- Discharge of liquid
- Pressure difference between two points in a channel
- Pressure difference between two points in a pipe
Q5 | Working principle of dead weight pressure gauge tester is based on
- Pascal's law
- Dalton's law of partial pressure
- Newton's law of viscosity
- Avogadro's hypothesis
Q6 | The meatcentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of aship is
- 4.1 s
- 5.2 s
- 10.4 s
- 14.1 s
Q7 | The discharge through a channel of rectangular section will be maximum, if
- Its depth is twice the breadth
- Its breadth is twice the depth
- Its depth is thrice the breadth
- Its breadth is thrice the depth
Q8 | The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.
- 0.34 times
- 0.67 times
- 0.81 times
- 0.95 times
Q9 | Uniform flow occurs when
- The flow is steady
- The flow is streamline
- Size and shape of the cross section in a particular length remain constant
- Size and cross section change uniformly along length
Q10 | Bulk modulus of a fluid is the ratio of
- Shear stress to shear strain
- Increase in volume to the viscosity of fluid
- Increase in pressure to the volumetric strain
- Critical velocity to the viscosity of fluid
Q11 | An average value of coefficient of velocity is
- 0.62
- 0.76
- 0.84
- 0.97
Q12 | A liquid would wet the solid, if adhesion forces as compared to cohesion forces are
- Less
- More
- Equal
- Less at low temperature and more at high temperature
Q13 | When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angularvelocity, the pressure
- Varies as the square of the radial distance
- Increases linearly as its radial distance
- Increases as the square of the radial distance
- Decreases as the square of the radial distance
Q14 | Which of the following is the unit of kinematic viscosity?
- Pascal
- Poise
- Stoke
- Faraday
Q15 | Reynold's number is the ratio of the inertia force to the
- Surface tension force
- Viscous force
- Gravity force
- Elastic force
Q16 | A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is
- 1
- 5
- 7
- 6
Q17 | A differential manometer is used to measure
- Atmospheric pressure
- Pressure in pipes and channels
- Pressure in Venturimeter
- Difference of pressures between two points in a pipe
Q18 | In a venturi-flume, the flow takes place at
- Atmospheric pressure
- Gauge pressure
- Absolute pressure
- None of these
Q19 | The normal stress is same in all directions at a point in a fluid
- Only when the fluid is frictionless
- Only when the fluid is incompressible and has zero viscosity
- When there is no motion of one fluid layer relative to an adjacent layer
- Irrespective of the motion of one fluid layer relative to an adjacent layer
Q20 | The highest efficiency is obtained with a channel of __________ section.
- Circular
- Square
- Rectangular
- Trapezoidal
Q21 | 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 per unit length is (where w = Specific weight of liquid, and H = Height of liquid)
- wH
- wH/2
- wH2/2
- wH2/3
Q22 | Which of the following manometer has highest sensitivity?
- U-tube with water
- Inclined U-tube
- U-tube with mercury
- Micro-manometer with water
Q23 | The velocity corresponding to Reynold number of 2800, is called
- Sub-sonic velocity
- Super-sonic velocity
- Lower critical velocity
- Higher critical velocity
Q24 | For a floating body to be in equilibrium
- Meta centre should be above e.g.
- Centre of buoyancy and e.g. must lie on same vertical plane
- A righting couple should be formed
- All of the above
Q25 | 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)
- 0.5 a. gH
- 0.707 a. gH
- 0.855 a. gH
- a. gH