Chemical Engineering Fluid Mechanics MCQ - Set 41 - ObjectiveBooks

Chemical Engineering Fluid Mechanics MCQ - Set 41

Practice Test: Question Set - 41

1. Manometers measure the __________ pressure.
    (A) Vacuum as well as the atmospheric
    (B) Difference in
    (C) Absolute
    (D) Gage

2. Path followed by water jet issuing from the bottom of a water tank will be a
    (A) Parabola (vertex being at the opening)
    (B) Hyperbola
    (C) Horizontal straight line
    (D) Zig-zag path (which is geometrically undefined)

3. Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid
    (A) Lies above the centroid of the plane surface
    (B) Is independent of the specific weight of the fluid
    (C) Is different for different fluids
    (D) Is at the centroid of the plane surface

4. For flow past a flat plate, if ‘x’ is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to
    (A) √x
    (B) 1/√x
    (C) x
    (D) 1/x

5. Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter 'd'
    (A) d
    (B) 0.5 d
    (C) 2d
    (D) 4d

6. The unit of bulk modulus of elasticity for a liquid in S.I. unit is
    (A) N
    (B) N/m
    (C) N/m2
    (D) N/m3

7. A special type of liquid transporting device is the diffuser pump, in which __________ are minimized.
    (A) Bearing losses
    (B) Disk friction
    (C) Shock losses
    (D) Cavitation

8. It is possible to integrate an automatic flow controller to a
    (A) Flow nozzle
    (B) Venturimeter
    (C) Rotameter
    (D) None of these

9. For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by
    (A) √(2gh)
    (B) C.V. √(2gh)
    (C) Cd √(2gh)
    (D) Cc √(2gh)

10. Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will
    (A) Increase
    (B) Decrease
    (C) Remain unchanged
    (D) Increase or decrease depending on the pipe material

11. Specific speed of a centrifugal pump relates it with another pump having the
    (A) Dynamic similarity
    (B) Same efficiency
    (C) Same speed
    (D) Geometrical similarity

12. The dimension of surface tension is
    (A) ML-2
    (B) MT-2
    (C) MLT-2
    (D) ML-2T

13. Isotropic turbulence occurs
    (A) Where there is no velocity gradient
    (B) At higher temperatures
    (C) Only in Newtonian fluids
    (D) None of these

14. N. second/m2 is
    (A) The S.I. unit of dynamic viscosity
    (B) The S.I. unit of kinematic viscosity
    (C) Equivalent to one poise
    (D) Equivalent to one stoke

15. A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation?
    (A) Inertial and drag forces are important
    (B) Drag, gravitational and buoyancy forces are important
    (C) Drag force and gravitational forces are important
    (D) None of the above

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