Fluid Mechanics Multiple Choice Test Online - Chemical engineering - Set 43 - ObjectiveBooks

Fluid Mechanics Multiple Choice Test Online - Chemical engineering - Set 43

Practice Test: Question Set - 43

1. Deformation drag, which is caused by widespread deformation of fluid around the immersed body
    (A) Occurs when NRe is very small
    (B) Is primarily a friction drag
    (C) Is independent of body length
    (D) Depends mainly on cross-sectional shape

2. For a reciprocating pump, the indicator diagram is the graph between the
    (A) Discharge and overall efficiency
    (B) Volume swept by piston for one complete revolution and the pressure in the cylinder
    (C) Angle swept by the crank pin at any instant and the discharge
    (D) None of these

3. The pump impeller and the turbine runner in a hydraulic torque converter
    (A) Have the same diameter
    (B) Have different diameters
    (C) Are directly coupled
    (D) None of these

4. Power requirement of fans having constant wheel diameter varies __________ fan speed.
    (A) As square of
    (B) Directly as
    (C) As cube of
    (D) None of these

5. Which is not a variable head meter?
    (A) Venturimeter
    (B) Pitot tube
    (C) Rotameter
    (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. Working principle of manometer comprises of balancing a column of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure.
    (A) Small differential
    (B) Atmospheric
    (C) Absolute
    (D) Gage

8. Which of the following is a dimensionless parameter?
    (A) Angular velocity
    (B) Specific weight
    (C) Kinematic viscosity
    (D) None of these

9. Creeping flow around a sphere is defined, when particle Reynolds number is
    (A) < 2100
    (B) < 0.1
    (C) > 2.5
    (D) < 500

10. When the pipe Reynold's number is 6000, the flow is generally
    (A) Viscous
    (B) Laminar
    (C) Turbulent
    (D) Transition

11. During ageing of fluid carrying pipes, the
    (A) Pipe becomes smoother with use
    (B) Friction factor increases linearly with time
    (C) Absolute roughness decreases with time
    (D) Absolute roughness increases linearly with time

12. Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.
    (A) NPSH required
    (B) BHP required by the pump
    (C) Head of the liquid pumped
    (D) All (a), (b) and (c)

13. In fluid flow, the stagnation point is defined as a point, where the __________ is zero.
    (A) Flow velocity
    (B) Pressure
    (C) Total energy
    (D) All (a), (b) and (c)

14. If Blasius or Darcy friction factor is 'f1' then the Fanning friction factor is equal to
    (A) f1/4
    (B) 4f2
    (C) 2f1
    (D) f1/2

15. A hydraulic ram acts as a/an __________ pump.
    (A) Centrifugal
    (B) Reciprocating
    (C) Impulse
    (D) Parallel cylinder

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