# Practice Test: Question Set - 49

**1. Fanning equation is given by (∆**

*P*/*ρ*) = 4*f*(*L*/*D*) (v^{2}/2*g*). It is applicable to __________ region flow._{c}- (A) Transition

- (B) Laminar

- (C) Turbulent

- (D) Both (b) and (c)

**2. The head loss in turbulent flow in a pipe varies**

- (A) Directly as the velocity

- (B) Inversely as the square of the velocity

- (C) Approximately as the square of the velocity

- (D) Inversely as the square of the diameter

**3. If the head over the triangular notch is doubled, the discharge will increase by __________ times.**

- (A) 2

- (B) 2.828

- (C) 5.657

- (D) 4

**4. Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where,**

*H*= difference in height of mercury column in mm).- (A)

*H*

- (B) 12.6

*H*

- (C) 13.6

*H*

- (D) 14.6

*H*

**5. In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is**

- (A) 0.5

- (B) 0.84

- (C) 1.84

- (D) 1.25

**6. For water, when the pressure increases, the viscosity**

- (A) Also increases

- (B) Decreases

- (C) Remain constant

- (D) First decreases, and then increases

**7. Which of the following fluid forces are not considered in the Navier-Stoke's equation?**

- (A) Gravity forces

- (B) Viscous forces

- (C) Pressure forces

- (D) Turbulent forces

**8. Foot valve provided in the pump is a __________ valve.**

- (A) Direction control

- (B) Back pressure

- (C) Relief

- (D) Pressure reduction

**9. For the production of very high vacuum, a __________ pump is normally used.**

- (A) Diffusion

- (B) Centrifugal

- (C) Jet ejector

- (D) Piston

**10. The equivalent diameter for fluid flow through square cross section channel of side '**

*x*', for pressure drop calculation purpose is given by- (A) 4

*x*

- (B) 2

*x*

- (C)

*x*

- (D) √

*x*

**11. 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

**12. Which of the following produces maximum pressure difference for transportation of gases?**

- (A) Vacuum pumps

- (B) Blowers

- (C) Fans

- (D) Compressors

**13. Navier-Stokes equation is useful in the analysis of __________ fluid flow problems.**

- (A) Non-viscous

- (B) Viscous

- (C) Turbulent

- (D) Rotational

**14. The most economical flow control valve for use with large diameter pipes is a**

- (A) Butterfly valve

- (B) Globe valve

- (C) Needle valve

- (D) None of these

**15. A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of**

*V*_{0}. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(*x*/*L*)^{2}, what will be axial velocity in the pipe at any ‘*x*’? Assume incompressible one dimensional flow i.e., no gradients in the radial direction.- (A)

*V*=

_{X}*V*

_{0}+

*q*(

*x*

^{3}/

*L*

^{2}

*D*)

- (B)

*V*=

_{X}*V*

_{0}+ ⅓

*q*(

*x*

^{3}/

*L*

^{2})

- (C)

*V*=

_{X}*V*

_{0}+ 2

*q*(

*x*

^{2}/

*LD*)

- (D)

*V*=

_{X}*V*

_{0}+ (4/3)

*q*(

*x*

^{3}/

*L*

^{2}

*D*)

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