Fluid Mechanics - Chemical Engineering Questions and Answers - Set 05 - ObjectiveBooks

# Practice Test: Question Set - 05

1. Bernoulli's equation is not applicable, when the flow is
(A) Irrotational
(B) Incompressible
(C) Viscous
(D) All (a), (b) & (c)

2. In case of a pipe exit fitted with a nozzle, the
(A) Conversion of kinetic head to pressure head is facilitated
(B) Conversion of pressure head to kinetic head is facilitated
(C) Power transmitted through the nozzle is maximum, when the head lost due to friction in the pipe is equal to one third of the total supply head
(D) Both (b) and (c)

3. Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will __________ the gas discharge pressure.
(A) Increase
(B) Decrease
(C) Not change
(D) Exponentially decrease

4. With increase in molecular weight of the gas, the head developed by a centrifugal compressor will
(A) Decrease
(B) Increase
(C) Remain same
(D) Unpredictable

5. Newton's law of viscosity relates the
(A) Shear stress and velocity
(B) Velocity gradient and pressure intensity
(C) Shear stress and rate of angular deformation in a fluid
(D) Pressure gradient and rate of angular deformation

6. Pick out the wrong statement.
(A) The eddy viscosity is a function of the type of turbulence involved
(B) The eddy viscosity is a fluid property
(C) The viscosity of gas increases with increase in temperature
(D) The viscosity of a liquid increases with decrease in temperature

7. Which is the most efficient and best for measuring very small flow rate of gases?
(A) Venturimeter
(B) Orificemeter
(C) Rotameter
(D) Flow nozzle

8. One poise (unit of absolute/dynamic viscosity) is equivalent to one
(A) gm/cm2. sec
(B) gm/cm. sec
(C) cm2/sec
(D) m2/sec

9. For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as
(A) d
(B) d2
(C) d4
(D) 2

10. Drag is defined as the force exerted by the
(A) Fluid on the solid in a direction opposite to flow
(B) Fluid on the solid in the direction of flow
(C) Solid on the fluid
(D) None of these

11. For laminar flow of Newtonian fluid in a circular pipe, the velocity distribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship.
(A) Logarithmic
(B) Parabolic
(C) Hyperbolic
(D) Linear

12. Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m)
(A) N2D3
(B) ND2
(C) N2D
(D) N3D5

13. A free jet of water of cross-sectional area 0.01m2 and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is
(A) 200 N
(B) 400 N
(C) 2000 N
(D) 4000 N

14. Pick out the wrong statement.
(A) Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces
(B) A hydrometer used for the determination of specific gravities of liquids works on the principle of buoyant forces
(C) In case of unsteady fluid flow, the velocity at any given point does not change with time
(D) Turbulent fluid flow is characterized by the rapid fluctuation of instantaneous pressure & velocity at a point

15. A relief valve
(A) Provides back pressure for a cylinder
(B) Unloads a pump
(C) Is a directional control valve
(D) None of these

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