Fluid Mechanics MCQs Competitive Exam Questions - Set 07 - ObjectiveBooks
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# Practice Test: Question Set - 07

1. Pick out the Blake-Plummer equation (valid for large NRe) for fluid flow through beds of solids.
(A) ∆p/ρ = 4f (L/D) (V2/2gc)
(B) fP = [150 (1 - ε)/NRe] + 1.75
(C) (-∆p. gc. D P 23)/(L. 0. µ (1 - ε)2) = 150
(D) (-∆p/δ.L) (gc/02) (DP3/(1 - ε)) = 1.75

2. I.D. of 1/4" schedule 40 pipe is 0.364". I.D. of a 1/2" schedule 40 pipe would be __________ inch
(A) 4.728
(B) 0.5
(C) 0.622
(D) 0.474

3. Which of the following is most prone to pulsating discharge flow?
(A) Centrifugal pump
(B) Reciprocating pump
(C) Gear pump
(D) Axial flow pump

4. With the increase in depth, the hydrostatic pressure in an un-accelerated incompressible fluid (in a constant gravitational field)
(A) Decreases
(B) Increases linearly
(C) Increases exponentially
(D) Remain constant

5. A centrifugal pump has the following specifications:
Power = 4 H.P.; Speed = 800 rpm
Flow = 1000 liters/minutes.
If its speed is halved, the new discharge will be __________ liters/minute.
(A) 500
(B) 200
(C) 1000
(D) 750

6. Pressure drop for turbulent fluid flow through a circular pipe is given by
(A) 64/Re
(B) 32µLV/gc.D2
(C) 4f (L/D) (v2/2gc). ρ
(D) f (L/D) (v2/2gc). ρ

7. Discharge in laminar flow through a pipe varies
(A) As the square of the radius
(B) Inversely as the pressure drop
(C) Inversely as the viscosity
(D) As the square of the diameter

8. An isentropic process is the one, in which
(A) pv = constant
(B) pvr= constant
(C) pvr = constant, and process is reversible
(D) None of these

9. Self-priming centrifugal pump can be used for
(A) Booster service
(B) Pumping liquid fertilizer's (e.g. liquid NH3)
(C) Pumping industrial wastes
(D) All (a), (b) and (c)

10. A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is
(A) 5
(B) 14.1
(C) 56.22
(D) 28.2

11. In deriving Bernoulli's equation, fluid is assumed to be
(A) Incompressible, frictionless, steady, along a streamline
(B) Uniform, steady, incompressible, along a streamline
(C) Steady, density being pressure dependent, frictionless
(D) None of these

12. The speed of a sound wave in a gas is analogous to the speed of
(A) An elementary wave in an open channel
(B) Flow in an open channel
(C) A disturbance travelling upstream in moving fluid
(D) None of these

13. Equivalent length of a pipe fitting is
(A) Dependent on Reynolds number
(B) Independent of Reynolds number
(C) Dependent on the length of the pipe
(D) None of these

14. Which of the following is used for very accurate measurement of flow of gas at low velocity?
(A) Pitot tube
(B) Rotameter
(C) Segmental orificemeter
(D) Hot wire anemometer

15. The Kozeny-Carman equation, rewritten in terms of non-dimensional numbers gives (ΔP/pu2 ) proportional to
(A) (L/Dp)/Re
(B) Re/(Dp/L)
(C) (L/Dp)/Re2
(D) Re2/(Dp/L)

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