Fluid Mechanics Problems and Solutions - Set 14 - ObjectiveBooks

Fluid Mechanics Problems and Solutions - Set 14

Practice Test: Question Set - 14

1. A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump
    (A) Develops a lower head
    (B) Capacity is reduced
    (C) Requires more power
    (D) All (a), (b) and (c)

2. Colebrook equation for friction factor in turbulent flow is given by,
f-0.5 = -4 loge [(ε/D) + (1.26/NReF). It reduces to Nikuradse equation for a value of (ϵ/D) equal to
    (A) 0
    (B) 1
    (D) 0.5

3. The pressure and power requirement of a gas fan at constant speed & capacity varies __________ the gas density.
    (A) Directly as
    (B) Inversely as square root of
    (C) Inversely as
    (D) As square of

4. Potential function is applicable only for __________ flow.
    (A) Irrotational
    (B) Turbulent
    (C) Steady
    (D) None of these

5. The maximum depth from which a centrifugal pump can draw water is
    (A) Dependent on the speed of the pump
    (B) Dependent on the power of the pump
    (C) 34 feet
    (D) 150 feet

6. The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids
    (A) Having high viscosities
    (B) Moving at low velocities
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

7. Laminar flow is characterized by the nonexistence of
    (A) Pressure fluctuation
    (B) Eddies
    (C) Deviating velocities
    (D) All (a), (b) & (c)

8. The losses in open channel flow generally vary as the
    (A) Inverse of the roughness
    (B) First power of the roughness
    (C) Square of the velocity
    (D) Inverse square of hydraulic radius

9. The capillary rise of mercury is maximum in glass tube of dia __________ mm.
    (A) 0.5
    (B) 1
    (C) 2
    (D) 5

10. Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a
    (A) Pitot tube
    (B) Manometer
    (C) Rotameter
    (D) None of these

11. Boundary layer exists in flow
    (A) Of real fluids
    (B) Over flat surfaces only
    (C) In pipes only
    (D) Of ideal fluids only

12. The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by
    (A) Cv . √(2gH)
    (B) Cc . √(2gH)
    (C) Cd . √(2gH)
    (D) Cv . Va

13. The most serious disadvantage of an orificemeter is that
    (A) It is not very accurate
    (B) It is very costly
    (C) Most of the pressure drop is not recoverable
    (D) It is not suitable for measuring gas flow

14. The component of acceleration resulting due to unsteady nature of flow is called __________ acceleration.
    (A) Normal
    (B) Local
    (C) Convective
    (D) Tangential

15. Drag is the force component exerted on an immersed object,
    (A) Passing the centroid of the body at 60°to the direction of motion
    (B) The component being parallel to the flow direction
    (C) The component being normal to the flow direction
    (D) None of these

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