Chemical Engineering Fluid Mechanics GATE Questions - Set 03 - ObjectiveBooks
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# Practice Test: Question Set - 03

1. In a free vortex, the
(A) Velocity changes linearly with radial distance
(B) Flow is necessarily rotational
(C) Radial component of velocity is same everywhere
(D) Stream lines are not circular

2. Applicability of Bernoulli's equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings.
(A) Incompressible
(B) Non-viscous
(C) Both (a) and (b)
(D) Neither (a) nor (b)

3. The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which "sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis". The centre of pressure of a rectangular surface (of width 'w') immersed vertically in a static mass of fluid is at a depth of (where, y = depth of the liquid)
(A) 1/(y/3)
(B) 2y/3
(C) 1/(y/4)
(D) 3y/4

4. The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/√f)-0.4, is called the __________ equation.
(B) Von-Karman
(C) Blasius
(D) Colebrook

5. Fluid flow through a packed bed is represented by the __________ equation.
(A) Fanning's
(B) Ergun's
(C) Hagen-Poiseuille’s
(D) None of these

6. Which of the following relationship is valid for the equilibrium position of the float in a Rotameter? (Where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float).
(A) Df + Bf = Wf
(B) Df = Bf + Wf
(C) Df + Bf + Wf =0
(D) None of these

7. Air vessel of a reciprocating pump is initially filled with
(A) Atmospheric air
(B) Compressed air
(C) Water
(D) None of these

8. Fluid resistance to shear depends upon its
(A) Rate of transfer of molecular momentum
(B) Cohesion
(C) Both (a) and (b)
(D) Neither (a) nor (b)

9. A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062.

(A) 10 m
(B) 11 m
(C) 11.8 m
(D) 30 m

10. Forces acting on a particle settling in fluid are __________ forces.
(A) Gravitational & buoyant
(B) Centrifugal & drag
(C) Gravitational or centrifugal buoyant drag
(D) External, drag & viscous

11. Fanning friction factor equation applies to the __________ fluid flow.
(A) Non-isothermal condition of
(B) Compressible
(C) Both (a) and (b)
(D) Neither (a) nor (b)

12. The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is
(A) 0.1
(B) 0.55
(C) 0.95
(D) 1.85

13. A pressure of 10 m head of water is equivalent to __________ kN/m2.
(A) 98
(B) 147
(C) 196
(D) 49

14. In case of turbulent flow of fluid through a circular pipe, the
(A) Mean flow velocity is about 0.5 times the maximum velocity
(B) Velocity profile becomes flatter and flatter with increasing Reynolds number
(C) Point of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius)
(D) Skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity profile at the wall are more

15. The maximum discharge through a circular channel takes place, when the depth of the fluid flow is __________ times the pipe diameter.
(A) 0.25
(B) 0.5
(C) 0.66
(D) 0.95

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