A. Viscous forces to gravity forces
B. Inertial forces to viscous forces
C. Viscous forces to inertial forces
D. Inertial forces to gravity forces
Related Mcqs:
- Power number is the ratio of____________________?
A. Drag stress to inertial stress
B. Inertial stress to drag stress
C. Inertial stress to gravitational stress
D. Gravitational stress to drag stress - Stoke’s equation is valid in the Reynolds number range__________________?
A. 0.01 to 0.1
B. 0.1 to 2
C. 2 to 10
D. 10 to 100 - Stoke’s law is valid, when the particle Reynolds number is ______________________?
A. < 1
B. > 1
C. < 5
D. None of these - The Reynolds number for an ideal fluid flow is _________________?
A. 4
B. 2100-4000
C. 4000
D. ∞ - Laminar flow of a Newtonian fluid ceases to exist, when the Reynolds number exceeds___________________?
A. 4000
B. 2100
C. 1500
D. 3000 - In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of___________________?
A. Relative roughness
B. Absolute roughness
C. Friction co-efficient for flows at equal Reynold number
D. All A., B. & C. - As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1 ?
A. Increases linearly with V
B. Decreases linearly with V
C. Decreases as V2
D. None of these - A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation ?
A. Inertial and drag forces are important
B. Drag, gravitational and buoyancy forces are important
C. Drag force and gravitational forces are important
D. None of the above - Boundary layer separation is characterised by one of the conditions given below, where ‘Re’ is the Reynolds number for the flow. Select the appropriate conditions ?
A. Re <> 1, accelerating flow
C. Re << 1, decelerating flow
D. Re >>1, decelerating flow - In the low Reynolds number region, the drag force on a sphere is proportional to_______________?
A. V
B. V2
C. V4
D. V0.5
