Chemical Engineering Fluid Mechanics Exam Paper Online - Set 31 - ObjectiveBooks

Practice Test: Question Set - 31

1. The pressure head of a flow meter remains constant for
(A) Venturimeter
(B) Orificemeter
(C) Rotameter
(D) Pitot tube

2. 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
(A) Flow rate
(B) Mean velocity
(C) Both 'a' & 'b'
(D) Neither 'a' nor 'b'

3. Which of the following quantities are computed by using the hydraulic radius for non-circular ducts?
(A) Velocity and relative roughness
(C) Reynold number, relative roughness and head loss
(D) Reynolds number and friction factor

4. A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidized by water (density 1000 kg/m3 ). If at the point of incipient fluidization, the bed voidage is 40%, the pressure drop across the bed is
(A) 4.4 KPa
(B) 2.94 KPa
(C) 3.7 KPa
(D) None of these

5. A pressure head of 320 metres of water in meters of CCl4 (sp.gr = 1.6) will be
(A) 100
(B) 200
(C) 320
(D) 160

6. Which of the following denotes the effect of compressibility in fluid flow?
(A) Weber number
(B) Mach number
(C) Euler number
(D) Reynolds number

7. For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter).
(A) 1/D
(B) 1/D2
(C) 1/D5
(D) D2

8. Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will
(A) Increase
(B) Decrease
(C) Remain same
(D) Data insufficient to predict pressure drop

9. A perfect gas
(A) Does not satisfy PV nRT
(B) Is incompressible and has zero viscosity
(C) Has constant specific heat
(D) Can’t develop shear stresses

10. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is
(A) 0.5
(B) 1
(C) 1.5
(D) 2

11. Check in a centrifugal pump is
(A) Provided in the discharge line
(B) Generally a globe valve
(C) Provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running
(D) All (a), (b) and (c)

12. Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (Îµ0) with age/time (t) (where, Îµ = roughness of the surface after time 't'. Î± = a co-efficient to be experimentally determined)?
(A) Îµ = Îµ0 + Î±.t
(B) Îµ = Îµ0 + Î±.t2
(C) Îµ = Îµ0 + Î±.t3
(D) Îµ = Îµ0 + Î±.t4

13. Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have
(A) Very low speeds
(B) Smaller discharge
(C) Higher capital &maintenance cost
(D) High vibrations

14. __________ pumps are axial flow pumps.
(A) Turbine
(B) Propeller
(C) Diffuser
(D) None of these

15. In an incompressible fluid, the density is
(A) Greatly affected by moderate changes in pressure
(B) Greatly affected only by moderate changes in temperature
(C) Not affected with moderate change in temperature & pressure
(D) Sensible to changes in both temperature & pressure

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