Chemical Engineering Online Exam - Fluid Mechanics - Set 39 - ObjectiveBooks

# Practice Test: Question Set - 39

1. In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.
(A) Directly proportional to
(B) Inversely proportional to
(C) Inversely proportional to the square root of
(D) Independent of

2. Pick out the wrong statement pertaining to fluid flow.
(A) The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid in circular pipes is 0.5
(B) The Newtonian fluid velocity in a circular pipe flow is maximum at the centre of the pipe
(C) Navier-Stokes equation is applicable to the analysis of viscous flows
(D) Hagen-Poiseuille equation is applicable to the laminar flow of Newtonian fluids

3. The capacity of an accumulator is the maximum
(A) Energy which it can store
(B) Discharge which it can deliver
(C) Liquid which it can store
(D) None of these

4. For the manometer set up shown in the figure, the pressure difference PA - PB is given by

(A) (ρH - ρair)gH
(B) (ρH - ρL)gH
(C) (ρH - ρL) gH + (ρL - ρair) . g(L - H)
(D) (ρH - ρL) gL + (ρL - ρair)gH

5. Priming of a centrifugal pump is done to
(A) Increase the mass flow rate of fluid
(B) Develop effective pressure rise by the pump
(C) Avoid chances of separation inside the impeller
(D) None of these

6. In case of a Rotameter, the density of the float material is __________ that of the liquid it replaces.
(A) More than
(B) Less than
(C) Equal to
(D) Either (a) or (b)

7. The fluid property which matters for falling rain drops to acquire spherical shape is its
(A) Pressure
(B) Height of descend
(C) Viscosity
(D) Surface tension

8. For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance 'd' measured from the wall of the pipe and the friction velocity 'v', and it follows a __________ relationship.
(A) Logarithmic
(B) Linear
(C) Hyperbolic
(D) Parabolic

9. Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an
(A) Weir
(B) Hot wire anemometer
(C) Cup and vane anemometer
(D) None of these

10. Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation?
(A) Decrease in effect
(B) Increase in thrust
(C) Develops noise
(D) Develops high pressure

11. A centrifugal pump loses prime after starting. The reason of this trouble may be
(A) Incomplete priming
(B) Too high a suction lift
(C) Low available NPSH and air leaks in the suction pipe
(D) All (a), (b), and (c)

12. Cd is always __________ Cc.
(A) Greater than
(B) Less than
(C) Equal to
(D) Either more or less than

13. The kinetic energy correction factor for velocity distribution of laminar flow is
(A) 0.5
(B) 1.66
(C) 1
(D) 2

14. A gas (density = 1.5 kg/m3, viscosity = 2 × 10‒5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5 kg/m3and viscosity of 3 × 10‒5kg/m.s flowing at 3 m/s will be
(A) 8400 Pa/m
(B) 12600 Pa/m
(C) 18900 Pa/m
(D) 16800 Pa/m

15. The co-efficient of drag and lift for an incompressible fluid depends on the
(A) Reynolds number
(B) Froude number
(C) Mach number
(D) All (a), (b) and (c)

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