Chemical Fluid Mechanics Multiple Choice Test - Set 16 - ObjectiveBooks

# Practice Test: Question Set - 16

1. The peripheral velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec.
(A) 1.8
(B) 12.4
(C) 186.2
(D) 736.4

2. The main factor on which the behavior of a mass of fluidized solid depends mainly is the
(A) Fluid characteristics
(B) Particle size
(C) Both (a) and (b)
(D) Neither (a) nor (b)

3. Hot wire anemometer is used to measure the
(A) Velocity of liquids
(B) Temperature of liquids
(C) Velocity of gases
(D) Pressure of liquids

4. Curve III in the bellow diagram represents a/an
(A) Dilatent fluid
(B) Pseudo plastic fluid
(C) Ideal plastic
(D) None of these

5. The pressure intensity is the same in all directions at a point in a fluid
(A) Only when the fluid is frictionless
(B) Only when the fluid is at rest having zero velocity
(C) When there is no motion of one fluid layer relative to an adjacent layer
(D) Regardless of the motion of one fluid layer relative to an adjacent layer

6. The capacity of a centrifugal pump Can be increased by increasing the
(A) Impeller diameter or speed
(B) Number of pumps and joining them in series
(C) Number of pumps and joining them in parallel
(D) All (a), (b) and (c)

7. Hydraulic mean radius for flow through packed bed of spherical particle of size, 'Dp, with porosity 'Îµ' is
(A) (Dp/6) (Îµ/1- Îµ)
(B) (Dp/6) (1- Îµ/Îµ)
(C) ⅔Dp (1- Îµ/Îµ)
(D) ⅔Dp (Îµ/1- Îµ)

8. The unit of velocity head is
(A) ft-lb/sec
(B) ft-lb/ft3
(C) ft-lbf/lb
(D) ft-lbf/sec

9. Gradually varying fluid flow is an example of __________ flow.

10. The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe)
(A) V2
(B) 1/V2
(C) 1/V
(D) V

11. Disc compensators are provided in large diameter fuel gas carrying pipelines to
(A) Keep the pipe in proper orientation
(B) Make the pipe joint leak-proof
(C) Account for contraction/expansion of pipe due to temperature changes of the surroundings
(D) Account for the pressure variation side the pipeline

(A) Elevation & kinetic energy
(B) Elevation & pressure
(C) Kinetic energy & pressure
(D) None of these

13. For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.
(A) Brings about no further reduction of
(B) Increases
(C) Decreases
(D) None of these

14. Prandtl number is a measure of the
(A) Heat conduction to viscosity of a fluid
(B) Cp/Cv of a fluid
(C) Elastic force to pressure force in the fluid flow
(D) Inertial force to elastic force in the fluid flow

15. Horsepower requirement for given pump capacity depends upon the
(A) Specific gravity of the liquid
(B) Suction lift
(D) All (a), (b) and (c)

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