Chemical Fluid Mechanics Objective Questions & Answers - ObjectiveBooks

Chemical Fluid Mechanics Objective Questions & Answers

Practice Test: Question Set - 51

1. Baffles in mixing tanks are provided to
    (A) Reduce swirling and vortex formation
    (B) Increase the structural strength of the tank
    (C) Aid in rotational flow
    (D) None of these

2. Bernoulli's equation describes the
    (A) Mechanical energy balance in potential flow
    (B) Kinetic energy balance in laminar flow
    (C) Mechanical energy balance in turbulent flow
    (D) Mechanical energy balance in boundary layer

3. __________ is used for measuring the static pressure exerted on the wall by a fluid flowing parallel to the wall in a pipeline.
    (A) Venturimeter
    (B) Pressure gauge
    (C) Pitot tube
    (D) Orificemeter

4. A lubricant 100 times more viscous than water would have a viscosity (in Pa.s)
    (A) 0.01
    (B) 0.1
    (C) 1
    (D) 10

5. In case of laminar flow of fluid through a circular pipe, the
    (A) Shear stress over the cross-section is proportional to the distance from the surface of the pipe
    (B) Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder
    (C) Velocity profile varies hyperbolically and the shear stress remains constant over the cross-section
    (D) Average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)

6. Cp/Cv is termed as
    (A) Adiabatic constant
    (B) Mach number
    (C) Weber number
    (D) Prandtl number

7. Pick out the wrong statement about cavitation.
    (A) Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation
    (B) Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities
    (C) Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise
    (D) Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine blades

8. For pumping slurry, one can use a __________ pump.
    (A) Reciprocating
    (B) Diaphragm
    (C) Centrifugal
    (D) Pneumatic

9. Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is
    (A) 10 √2π
    (B) 5π/2
    (C) 5 √2π
    (D) 5π/√2

10. The pump used for irrigation purposes is generally designed for
    (A) Large capacity & high head
    (B) Large capacity & low head
    (C) Small capacity & high head
    (D) Small capacity & low head

11. Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.
    (A) ∂/∂t = 0
    (B) ∂/∂t = constant
    (C) ∂/∂s = 0
    (D) ∂/∂s = constant

12. Viscosity of a liquid decreases __________ with rise in temperature.
    (A) Exponentially
    (B) Linearly
    (C) Logarithmically
    (D) None of these

13. Hydraulic radius of 6" × 12" cross-section, is __________ inches.
    (A) 2
    (B) 0.5
    (C) 1.5
    (D) None of these

14. Pressure gradient in the pipe flow is influenced by the
    (A) Diameter of pipe
    (B) Velocity of the fluid
    (C) Density & viscosity of the fluid
    (D) All (a), (b) and (c)

15. One stoke (unit of kinematic viscosity) is equivalent to
    (A) 1 cm2/second
    (B) 1 m2/second
    (C) 1 gm/cm. second
    (D) 1 kg. m/second

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