Flow occurring in a pipeline when a valve is being opened is (A) Steady (B) Unsteady (C) Laminar (D) Vortex

Flow occurring in a pipeline when a valve is being opened is
(A) Steady
(B) Unsteady
(C) Laminar
(D) Vortex
by

1 Answer

Answer :

Answer: Option B
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In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow? (A) Discharge of water by a centrifugal pump being run at a constant rpm (B) Water flow in the suction and discharge pipe of a reciprocating pump (C) Water discharge from a vertical vessel in which constant level is maintained (D) Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

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Boundary layer separation occurs when the (A) Pressure reaches a minimum (B) Cross-section of the channel is reduced (C) Valve is closed in a pipeline (D) Velocity of sound is reached

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In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than (A) Frictional force (B) Viscosity (C) Surface friction (D) All of the above

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Which of the following is an example of laminar flow? (A) Underground flow (B) Flow past tiny bodies (C) Flow of oil in measuring instruments (D) All of these

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The velocity at which the laminar flow stops, is known as (A) Velocity of approach (B) Lower critical velocity (C) Higher critical velocity (D) None of these

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For pipes, laminar flow occurs when Reynolds number is (A) Less than 2000 (B) Between 2000 and 4000 (C) More than 4000 (D) Less than 4000

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The velocity at which the flow changes from laminar flow to turbulent flow is called (A) Critical velocity (B) Velocity of approach (C) Sub-sonic velocity (D) Super-sonic velocity

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The flow in a pipe is neither laminar nor turbulent when Reynold number is (A) Less than 2000 (B) Between 2000 and 2800 (C) More than 2800 (D) None of these

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The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v w = Specific weight of the flowing liquid) (A) 4 (B) 8 (C) 16 (D) 32

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