Chemical Engineering Fluid Mechanics Objective Type Questions - Set 42 - ObjectiveBooks
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Chemical Engineering Fluid Mechanics Objective Type Questions - Set 42

Practice Test: Question Set - 42


1. Water flow rate in a pipe of 3.5 meters diameter can be most economically and conveniently measured by a/an
    (A) Pitot tube
    (B) Venturimeter
    (C) Orificemeter
    (D) Rotameter

2. Which of the following is the ‘Blasius equation’, relating friction factor to the Reynolds number?
    (A) f = 0.079.NRe-0.25
    (B) f-0.5 = 4.07 loge (NRef)-0.6
    (C) Both ‘a’ and ‘b’
    (D) None of these

3. Maintenance cost of a __________ pump for a particular duty is the least.
    (A) Centrifugal
    (B) Reciprocating
    (C) Volute
    (D) Gear

4. In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant?
    (A) Rotational
    (B) Unsteady
    (C) Turbulent
    (D) Non-uniform

5. With a constant diameter impeller of a centrifugal pump
    (A) Its capacity varies directly as the square of speed
    (B) Head varies as the square of speed
    (C) Horsepower input varies as the square of speed
    (D) Head varies as the speed

6. Draining of shallow pits or sump is done by a sump pump, which is a __________ pump.
    (A) Single stage vertical
    (B) Centrifugal
    (C) Plunger
    (D) Diffuser

7. Which of the following is an undesirable property of a manometric liquid?
    (A) Non-sticky & non-corrosive nature
    (B) High vapor pressure
    (C) Low viscosity & surface tension
    (D) Low co-efficient of thermal expansion

8. Each term of the Bernoulli's equation written in the form, (p/ρ) + (g/gc). Z + (v2/2gc) = constant, represents the total energy per unit
    (A) Mass
    (B) Volume
    (C) Specific weight
    (D) None of these

9. In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.
    (A) Inverse
    (B) Square root
    (C) Second power
    (D) First power

10. What causes convective acceleration in fluid flow?
    (A) Steep slope in flow
    (B) Unsteady nature of flow
    (C) Non-uniformity of flow
    (D) Turbulence in flow

11. The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is
    (A) QN : HN2 : PN3
    (B) QN2 : HN3 : PN
    (C) QN : HN3 : PN2
    (D) QN3 : HN : PN2

12. A streamline is
    (A) The line connecting the mid-points of flow cross-sections
    (B) Defined for uniform flow only
    (C) Drawn normal to the velocity vector at every point
    (D) Always the path of a particle

13. A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 meters and its porosity 0.6, the pressure drop required to fluidize the bed by air is
    (A) 25.61 kPa
    (B) 11.77 kPa
    (C) 14.86 kPa
    (D) 21.13 kPa

14. With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the
    (A) Velocity increases
    (B) Pressure decreases
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

15. Efficiency of power transmission (η) through a circular pipe is given by (ht - hf)/ht, which has a maximum value of __________ percent.
    (A) 33:3
    (B) 50
    (C) 66.6
    (D) 88.8

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