Pick out the correct statement?

Related Mcqs:

1. Pick out the correct statement pertaining to transition/ entrance length in fluid flow ?

   A. The length of entrance region of pipe, in which full development of fluid flow takes place
   such that velocity profile does not change downstream, is called the transition length
   B. Transition length for laminar flow of Newtonian fluids in a pipe of diameter ‘d’ is equal to
   0.05. D.NRe
   C. Transition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter ‘d’ is
   equal to 50 D
   D. All A., B. and C.

2. Pick out the correct statement pertaining to Venturimeter ?

   A. A Venturimeter with a fixed pressure drop discharges more, when the flow is vertically
   downward, than when the flow is vertically upward
   B. The co-efficient of contraction of a Venturimeter is always unity
   C. For a fixed pressure drop, the discharge of a gas through a Venturimeter is greater, when
   compressibility is taken into account, than when it is neglected
   D. None of these

3. 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

4. Pick out the correct statement?

   A. Human blood is a Newtonian fluid
   B. A Newtonian fluid obeys Newton’s law of cooling
   C. For a non-Newtonian fluid, a straight line passes through the origin in a plot between shear
   stress and shear gradient
   D. Thin lubricating oil is an example of a non-Newtonian fluid

5. Pick out the correct statement pertaining to the flow through a converging-diverging tube ?

   A. The value of Mach number is always unity at the throat
   B. No shock wave develops in the tube when the Mach number at exit is greater than unity
   C. Throughout the converging portion of the tube, the density increases in the downstream
   direction
   D. None of these

6. Pick out the correct statement?

   A. Fanning friction factor is inversely proportional to Reynolds number always
   B. The property of a randomly packed bed (with raschig rings) is given by the ratio of the total
   volume to the volume of voids in the bed
   C. Mach number in an incompressible fluid is always unity
   D. Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under
   conditions of flow

7. 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 characterised by the rapid fluctuation of instantaneous pressure &
   velocity at a point

8. Pick out the wrong statement?

   A. A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity
   B. Newton’s law of viscosity is not applicable to the turbulent flow of fluid with linear velocity
   distribution
   C. Laminar flow of viscous liquids is involved in the lubrication of various types of bearings
   D. Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes

9. 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

10. Pick out the wrong statement about a streamline ?

    A. It is always parallel to the main direction of the fluid flow
    B. It is a line across which there is no flow and it is equivalent to a rigid boundary
    C. Streamlines intersect at isolated point of zero velocity and infinite velocity
    D. The fluid lying between any two streamlines can be considered to be in isolation and the
    streamline spacing varies inversely as the velocity