Elements of Fluid Mechanics Chemical Engineering - Set 50 - ObjectiveBooks

Elements of Fluid Mechanics Chemical Engineering - Set 50

Practice Test: Question Set - 50

1. The lift of a balloon is
    (A) Increased, as it rises to a higher altitude
    (B) Due to the weight of the atmospheric air, that it displaces
    (C) Not dependent on the temperature of the atmosphere
    (D) None of these

2. A globe valve is the most suitable for applications, in which
    (A) Fluid flow control is required
    (B) Fluid contains dispersed solid particles
    (C) Valve is required to be either fully open or fully closed
    (D) One way flow is required

3. Unit of mass velocity is
    (A) kg/hr
    (B) kg/m2. hr
    (C) kg/m2
    (D) kg/m3. hr

4. Buckingham-π theorem states that in any physical problem including 'n' quantities having 'm' dimensions, the quantities can be arranged into __________ independent dimensionless parameters.
    (A) m
    (B) n
    (C) n-m
    (D) n/m

5. Minimum fluidization velocity for a specific system depends upon the
    (A) Particle size
    (B) Fluid viscosity
    (C) Density of both the particle & the fluid
    (D) All (a), (b) and (c)

6. For an ideal fluid flow, Reynolds number is
    (A) 2100
    (B) 100
    (C) 0
    (D) ∞

7. When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an
    (A) Ejector
    (B) Blower
    (C) Injector
    (D) Airlift

8. Permanent pressure loss in a well designed Venturimeter is about __________ percent of the venturi differential.
    (A) 1
    (B) 10
    (C) 30
    (D) 50

9. In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is
    (A) The velocity of sound
    (B) Dependent on its cross-sectional area
    (C) Dependent on fluid viscosity
    (D) Dependent on fluid density

10. The hydraulic radius for flow in a rectangular duct of cross-sectional dimension HW is
    (A) √(HW/π)
    (B) HW/2 (H + W)2
    (C) HW/4 (H + W)2
    (D) 2HW/(H + W)

11. Pressure drop for laminar fluid flow through a circular pipe is given by
    (A) 4f (L/D) (v2/2gc) ρ
    (B) 32 (µLV/gc D2)
    (C) 16/NRe
    (D) (fLρ/D) (v2/2gc)

12. The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is
    (A) 4(Ro-Ri)
    (B) √(Ro-Ri)
    (C) 2(Ro-Ri)
    (D) Ro + Ri

13. What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5)?
    (A) 0.61 - 0.63
    (B) 0.5 - 0.75
    (C) 0.75 - 0.90
    (D) 0.35 - 0.55

14. Flow measurement in an open channel is done by a/an
    (A) Venturimeter
    (B) Orificemeter
    (C) Weir
    (D) Rotameter

15. Major loss in sudden contraction in pipe flow is due to
    (A) Boundary friction
    (B) Flow contraction
    (C) Expansion of flow after sudden contraction
    (D) None of these

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