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

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
by

1 Answer

Answer :

Answer: Option B
by

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11. The velocity at which the turbulent flow starts is known as higher critical velocity. A) Yes B) No

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The velocity corresponding to Reynold number of 2000 is called (A) Sub-sonic velocity (B) Super-sonic velocity (C) Lower critical velocity (D) Higher critical velocity

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The velocity corresponding to Reynold number of 2800, is called (A) Sub-sonic velocity (B) Super-sonic velocity (C) Lower critical velocity (D) Higher critical velocity

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The loss of pressure head in case of laminar flow is proportional to (A) Velocity (B) (Velocity)2 (C) (Velocity)3 (D) (Velocity)4

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Consider the following statements in respect of steady laminar flow through a circular pipe: 1. Shear stress is zero on the central axis of the pipe 2. Discharge varies directly with the viscosity of the fluid 3. Velocity is maximum at the centre of the pipe. 4. Hydraulic gradient varies as the square of the mean velocity of flow. Which of these statements are correct? (a) 1, 2 , 3 & 4 (b) 1 & 3 only (c) 2 & 4 only (d)3 & 4 only

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For a laminar flow of fluid in a circular tube, 'h1 ' is the convective heat transfer co-efficient at velocity 'V1 '. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is (A) 1.26 h1(B) 0.794 h1(C) 0.574 h1(D) 1.741 h1

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A fluid (µ/ρ) = 0.01 cm2 /sec is moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is __________ cm/sec. (A) 7 (B) 700 (C) 7000 (D) 630

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Last Answer : (A) 7

Critical velocity in a pipe flow (A) Increases as fluid viscosity increases (B) Increases as pipe diameter increases (C) Independent of fluid density (D) None of these

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Last Answer : Answer: Option D

The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach) (A) (2/3) Cd × L. 2g [H1 - Ha] (B) (2/3) Cd × L. 2g [H1 3/2 - Ha 3/2] (C) (2/3) Cd × L. 2g [H1 2 - Ha 2 ] (D) (2/3) Cd × L. 2g [H1 5/2 - Ha 5/2]

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