Chemical Fluid Mechanics Viva Test - Set 49 - ObjectiveBooks

# Practice Test: Question Set - 49

1. Fanning equation is given by (∆P/ρ) = 4f (L/D) (v2/2gc). It is applicable to __________ region flow.
(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) 4x
(B) 2x
(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 V0. 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) VX = V0 + q (x3/L2D)
(B) VX = V0 + ⅓q (x3/L2)
(C) VX = V0 + 2q (x2/LD)
(D) VX = V0 + (4/3) q (x3/L2D)

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