Home / Chemical Engineering / Fluid Mechanics :: Section 1

### Chemical Engineering :: Fluid Mechanics

1. The fluid property, due to which, mercury does not wet the glass is

2.  A. surface tension B. viscosity C. cohesion D. adhesion

3. Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds

4.  A. 4000 B. 2100 C. 1500 D. 3000

5. When the momentum of one fluid is used for moving another fluid, such a device is called a/an

6.  A. jet pump B. blower C. acid egg D. none of these

7. The normal stress is the same in all directions at a point in a fluid, when the fluid is

8.  A. non-viscous. B. incompressible. C. both (a) and (b). D. having no motion of one fluid layer relative to the other.

9. Head developed by a centrifugal pump depends on its

10.  A. speed B. impeller diameter C. both (a) and (b) D. neither (a) nor (b)

11. Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum

12.  A. flow rate B. mean velocity C. both 'a' & 'b' D. neither 'a' nor 'b'

13. The head loss in turbulent flow in a pipe varies

14.  A. as velocity B. as (velocity)2 C. inversely as the square of diameter D. inversely as the velocity

15. Most commonly used joint in the underground pipe lines is the

16.  A. sleevejoint B. coupling C. flange D. expansion joint

17. Schedule number of a pipe, which is a measure of its wall thickness, is given by

18.  A. 1000 P'/S B. 100 P'/S C. 1000 S/P' D. 10000 P'/S

19. The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the

20.  A. discharge. B. suction. C. suction minus vapor pressure of the liquid at suction temperature. D. discharge minus vapor pressure of the liquid at the discharge temperature.