Chemical Fluid Mechanics Final Exam with Solution - Set 10 - ObjectiveBooks
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# Practice Test: Question Set - 10

1. The head loss due to sudden contraction is proportional to
(A) Velocity
(C) Turbulence
(D) None of these

2. The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for __________ fluid.
(A) Newtonian
(B) Dilatant
(C) Pseudo-plastic
(D) Non-Newtonian

3. Critical velocity in a pipe flow
(A) Increases as fluid viscosity increases
(B) Increases as pipe diameter increases
(C) Independent of fluid density
(D) None of these

4. The time of oscillation of a floating body is
(A) Longer, if Metacentric height is increased
(B) Independent of the Metacentric height
(C) Dependent on the buoyant forces only
(D) None of these

5. Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2. Pick out the correct statement.
(A) f1 = f2
(B) f1 < f2
(C) f1 > f2
(D) Data not sufficient to relate f1 & f2

6. For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, = pipe radius, x = distance).
(A) V/Vmax = (x/r)1/7
(B) V/Vmax = (r/x)1/7
(C) V/Vmax = (x.r)1/7
(D) None of these

7. Choose the set of pressure intensities that are equivalent.
(A) 4.33 psi, 10 ft. of water, 8.83 inches of Hg
(B) 4.33 psi, 10 ft. of water, 20.7 inches of Hg
(C) 10 psi, 19.7 ft. of water, 23.3 inches of Hg
(D) 10 psi, 19.7 ft. of water, 5.3 inches of Hg

8. The Reynolds number for an ideal fluid flow is
(A) 4
(B) 2100-4000
(C) 4000
(D) ∞

9. Velocity head on sudden enlargement in a horizontal pipe is converted into __________ head.
(A) Elevation
(B) Pressure
(C) Both (a) & (b)
(D) Neither (a) nor (b)

10. A centrifugal pump has the following specifications:
Power = 4 H.P.; Speed = 800 rpm
Flow = 1000 liters/minutes.
If its speed is halved, then the new head will be __________ meters.
(A) 2
(B) 4
(C) 8
(D) 5.5

11. Transition length for turbulent flow in smooth pipe is equal to __________ times the pipe diameter.
(A) 0.5
(B) 5
(C) 50
(D) 500

12. Enamels and paints are generally __________ fluid.
(A) Rheopectic
(B) Pseudo-plastic
(C) Thixotropic
(D) Dilatant

13. Stoke's law is valid, when the particle Reynolds number is
(A) < 1
(B) > 1
(C) < 5
(D) None of these

14. The distance between metacentre and __________ is called metacentric height.
(A) Water surface
(B) Centre of gravity
(C) Centre of buoyancy
(D) None of these

15. If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is
(A) Same in both the tubes
(B) Greater in 1 mm dia tube
(C) Greater in 0.5 mm dia tube
(D) Zero in both the tubes

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