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Q1. | For laminar flow in circular pipes, the Darcy's friction factor f is equal to |

A. | 16/Re [Wrong Answer] |

B. | 32/ Re [Wrong Answer] |

C. | 64/ Re [Correct Answer] |

D. | none of the above where R,, is Reynolds number. [Wrong Answer] |

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Explanation:-
Answer : CDiscuss it below :Naveen nani Said on 2020-06-20 23:46:31C !! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on

a circular disc of plate held normal to flow

a sphere

a cylinder

a streamlined body

⇒ If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be.

from reservoir A to reservoirs B and C

from reservoir B to reservoirs C and A

from reservoir C to reservoirs A and B

unpredictable

⇒ A floating body is said to be in a state of stable equilibrium

when its metacentric height is zero

when the metacentre is above the centre of gravity

when the metacentre is below the centre of gravity

only when its centre of gravity is below its centre of buoyancy

⇒ The Prartdtl mixing length is

zero at the pipe wall

maximum at the pipe wall

independent of shear stress

none of the above

⇒ Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is.

slightly less

slightly more

nearly half

equal

⇒ For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be.

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337.5

600

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⇒ The pressure intensity in kg/cm

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The friction factor decreases with time.

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⇒ Which of the following is an incorrect statement ?

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⇒ For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is

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a function of Reynolds number and relative roughness

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⇒ The boundary layer thickness in turbulent flow varies as.

x"7

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x4/5

x3/5

⇒ The unit of kinematic viscosity is.

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dyne-sec/cm2

gm/cm2-sec

cm2/sec

⇒ The ratio between inertia force and viscous force is called

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⇒ The turbine suitable for low heads and high flow rates is

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⇒ The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is

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20 km

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⇒ As ideal fluid is

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⇒ If the Froude's number of flow in an open channel is more than 1.0 then the flow is said to be

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⇒ Pressure measured with the help of piezometer tube is

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Transition flow

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⇒ Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is

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between 1.5 d and 2d

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⇒ Froude number is the ratio of inertia force to

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Gravity force

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⇒ Hot wire anemometer is used to measure.

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pressure intensity of gas

pressure intensity of liquid

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Kinetic energy

⇒ The weight per unit volume of a liquid at a standard temperature and pressure is called

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⇒ When an ideal fluid flows past a sphere,

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⇒ In a forced vortex motion, the velocity of flow is

directly proportional to its radial distance from axis of rotation

inversely proportional to its radial distance from the axis of rotation

inversely proportional to the square of its radial distance from the axis of rotation

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⇒ A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be

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10m

100m

none of the above

⇒ The force exerted by jet on vane is determined by

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Momentum principle

Continuity equation

None of the above

⇒ An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to

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g