# Practice Test: Question Set - 08

**1. Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics?**

- (A) Archimedes principle

- (B) Newton's second law of motion

- (C) Hooke's law

- (D) Newton's third law of motion

**2. Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around**

- (A) 2000

- (B) 10

- (C) 100

- (D) 1000

**3. Pick out the correct statement pertaining to transition/ entrance length in fluid flow.**

- (A) The length of entrance region of pipe, in which full development of
fluid flow takes place such that velocity profile does not change downstream,
is called the transition length

- (B) Transition length for laminar flow of Newtonian fluids in a pipe of
diameter 'd' is equal to 0.05. D.N

_{Re}

- (C) Transition length for turbulent flow of Newtonian fluids in a smooth
pipe of diameter 'd' is equal to 50 D

- (D) All (a), (b) and (c)

**4. In the complete turbulence zone (in rough pipes), the**

- (A) Rough and smooth pipes have the same friction factor

- (B) Laminar film covers the roughness projections

- (C) Friction factor depends upon

*NR*only

_{e}- (D) Friction factor is independent of the relative roughness

**5. In a dry packed bed, the pressure drop will be changed by increasing the flow rate as**

- (A) V

^{1.8}

- (B) V

^{-0.8}

- (C) V

- (D) V

^{-1}

**6. What is the value of Fanning friction factor f ' for smooth pipe at N**

_{Re}= 10^{6}approximately?- (A) 0.003

- (B) 0.01

- (C) 0.1

- (D) 0.3

**7. Toothpaste is a**

- (A) Bingham plastic

- (B) Pseudo-plastic

- (C) Newtonian liquid

- (D) Dilatent

**8. For turbulent flow of an incompressible fluid through a pipe, the flow rate ‘**

*Q*’ is proportional to (Î”*P*)*n*, where Î”P is the pressure drop. The value of exponent '*n*' is- (A) 1

- (B) 0

- (C) < 1

- (D) > 1

**9. Drag force on the float of a Rotameter is (where**

*Q*= flow rate of the)- (A) ∝

*Q*

- (B) ∝ √

*Q*

- (C) ∝

*Q*

^{2}

- (D) Constant

**10. A piezometer provided in the pipe measures**

- (A) Friction factor

- (B) Static pressure

- (C) Dynamic pressure

- (D) None of these

**11. The boundary layer is that part of a moving fluid, in which the fluid velocity is**

- (A) Affected by the fluid flow pressure

- (B) Constant

- (C) Affected by the presence of a solid boundary

- (D) All (a), (b) and (c)

**12. Which of the following equations is valid for laminar flow of a fluid through packed bed?**

- (A) Fanning equation

- (B) Kozeny - Karman equation

- (C) Hagen-Poiseuille equation

- (D) Blake-Plummer equation

**13. The Prandtl mixing length is**

- (A) Zero at the pipe wall and is a universal constant

- (B) Independent of radial distance from the pipe axis

- (C) Independent of the shear stress

- (D) Useful for computing laminar flow problems

**14. As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to (where,**

*Î¼*= fluid viscosity)- (A) 1/

*Î¼*

- (B)

*Î¼*

- (C)

*Î¼*

^{2}

- (D) 1/

*Î¼*

^{2}

**15. The ratio of actual discharge to theoretical discharge through an orifice is equal to**

- (A) C

_{c}. C

_{v}

- (B) C

_{c}. C

_{d}

- (C) C

_{v}. C

_{d}

- (D) C

_{d}/C

_{v}

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