Civil Engineering MCQ. PWD, CPWD, RRB, SSC, Mock Test Paper

Subject: Fluid Mechanics Paper 6

**Part 6: List for questions and answers of Fluid Mechanics I**

**Q1. The Prandtl mixing length for turbulent flow through pipes is**

a) Independent of shear stress

b) A universal constant

c) Zero at the pipe wall

d) Independent of radial distance from pipe axis

**Q2. The velocity profile for turbulent flow through a closed conduit is**

a) Logarithmic

b) Parabolic

c) Hyperbolic

d) Linear

**Q3. For solving network problems of pipes, necessary condition is**

a) Continuity equation

b) Energy equation

c) Darcy-Weisbach equation

d) All the above.

**Q4. The velocity profile for turbulent flow through a closed conduit is**

a) Logarithmic

b) Parabolic

c) Hyperbolic

d) Linear

**Q5. Which of the following denotes the effect of compressibility in fluid flow?**

a) Weber number

b) Mach number

c) Euler number

d) Reynolds number

**Q6. _________ Pumps are axial flow pumps.**

a) Turbine

b) Propeller

c) Diffuser

d) None of these

**Q7. Two dimensional stream function**

a) Relates velocity and pressure

b) Is constant along a stream line

c) Is constant along an equipotential surface

d) None of these

**Q8. What causes cavitations in centrifugal pump?**

a) High suction pressure

b) Low barometric pressure

c) Low suction pressure

d) High suction velocity

**Q9. Draining of shallow pits or sump is done by a sump pump, which is a __________ pump.**

a) Single stage vertical

b) Centrifugal

c) Plunger

d) Diffuser

**Q10. The Stoke’s stream function applies to the**

a) Irrotational flow only

b) Ideal/non-viscous fluids only

c) Cases of axial symmetry

d) None of these

**Q11. Bernoulli’s equation is dependent on the**

a) First law of thermodynamics

b) Third law of thermodynamics

c) Law of conservation of momentum

d) None of these.

**Q12. The simple pitot tube does not measure the**

a) Static pressure

b) Dynamic pressure

c) Velocity at the stagnation point

d) All (a), (b) and (c)

**Q13. Venturimeter and orifice meter measures the __________ of the fluid**

a) Pressure

b) Maximum velocity

c) Average velocity

d) Point velocity

**Q14. Euler’s equation of motion states, that at every point, the**

a) Fluid momentum is constant

b) Force per unit mass equals acceleration

c) Rate of mass outflow is equal to the rate of mass inflow

d) None of these

**Q15. The Navier-Stokes equation deals with the law of conservation of**

a) Mass

b) Energy

c) Both (a) and (b)

d) Momentum

**Q16. An ideal fluid is**

a) Non-viscous

b) Incompressible

c) Both (a) and (b)

d) Neither (a) and (b)

**Q17. Boundary layer separation is caused by the**

a) Reduction of pressure to vapour pressure

b) Boundary layer thickness reducing to zero

c) Adverse pressure gradient.

d) Reduction of pressure gradient to zero

**Q18. With increase in temperature, the vapour pressure of liquids**

a) Increases

b) Increases linearly

c) Decreases.

d) Remains constant

**Q19. A centrifugal pump is called a turbine pump, if it is having a**

a) Turbine type impeller

b) Vaned diffusion casing

c) Rotatingvaned volute

d) None of these

**Q20. Centre of pressure in an immersed body is __________ the centre of gravity.**

a) Above

b) Below

c) At

d) Either above or below; depends on the liquid density

**Part 6: List for questions and answers of Fluid Mechanics I**

Q1. Answer: a

Q2. Answer: a

Q3. Answer: d

Q4. Answer: a

Q5. Answer: b

Q6. Answer: b

Q7. Answer: b

Q8. Answer: c

Q9. Answer: a

Q10. Answer: c

Q11. Answer: d

Q12. Answer: d

Q13. Answer: c

Q14. Answer: a

Q15. Answer: d

Q16. Answer: c

Q17. Answer: d

Q18. Answer: a

Q19. Answer: b

Q20. Answer: b