6361. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is
0.5
1
1.5
2
✅ The correct answer is option D.
Chemical Engineering
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6362. Horsepower requirement for given pump capacity depends upon the
Specific gravity of the liquid
Suction lift
Discharge head
All of the above
✅ The correct answer is option D.
6363. The fluid property which matters for fall-ing rain drops to acquire spherical shape is its
Pressure
Height of descend
Viscosity
Surface tension
✅ The correct answer is option D.
6364. Fanning friction factor is equal to(where, fB = Blassius friction factor).
fB/4
fB/2
4fB
2fB
✅ The correct answer is option A.
6365. Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is
10√2π
5π/2
5√2π
5π/√2
✅ The correct answer is option B.
6366. Prandtl number is a measure of the
Heat conduction to viscosity of a fluid
Cp/Cv of a fluid
Elastic force to pressure force in the fluid flow
Inertial force to elastic force in the fluid flow
✅ The correct answer is option A.
6367. The Prandtl mixing length is
Zero at the pipe wall and is a universal constant
Independent of radial distance from the pipe axis
Independent of the shear stress
Useful for computing laminar flow problems
✅ The correct answer is option D.
6368. Which of the following is an undesirable property of a manometric liquid?
Non-sticky & non-corrosive nature
High vapour pressure
Low viscosity & surface tension
Low co-efficient of thermal expansion
✅ The correct answer is option B.
6369. For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary
Directly as square of gas density
Directly as gas density
Directly as square root of gas density
Inversely as gas density
✅ The correct answer is option B.
6370. Froude number is the ratio of
Shear stress to gravitational stress
Drag stress to shear stress
Inertial stress to shear stress
Inertial stress to gravitational stress
✅ The correct answer is option D.