A. Velocity is uniform at any cross-section
B. Velocity gradient is zero at the solid surface
C. Resistance between the surface & the fluid is lesser as compared to that between the fluid
layers themselves
D. Velocity is not zero at the solid surface
Related Mcqs:
- Bernoulli’s equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli’s equation? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible ?
A. A, C, D
B. B, D, E
C. A, B, E
D. A, D, E - The pressure drop per unit length of pipe incurred by a fluid ‘X’ flowing through pipe is Δp. If another fluid ‘Y’ having both the specific gravity & density just double of that of fluid ‘X’, flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be__________________?
A. Δp
B. 2Δp
C. Δp2
D. Δp/2 - A rectangular surface 3′ × 4′, has the lower 3 edge horizontal and 6′ below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is (where, y = specific weight of water) ?
A. 39.6y
B. 48y
C. 49.2y
D. 58y - In the Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is ______________ the fluid viscosity?
A. Directly proportional to
B. Inversely proportional to
C. Inversely proportional to the square root of
D. Independent of - In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant ?
A. Rotational
B. Unsteady
C. Turbulent
D. Non-uniform - The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which “sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis”. The centre of pressure of a rectangular surface (of width ‘w’) immersed vertically in a static mass of fluid is at a depth of (where, y = depth of the liquid) ?
A. 1/(y/3)
B. 2y/3
C. 1/(y/4)
D. 3y/4 - The main factor on which the behaviour of a mass of fluidised solid depends mainly is the___________________?
A. Fluid characteristics
B. Particle size
C. Both A. and B.
D. Neither A. nor B. - For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the___________________?
A. Square of the radial distance
B. Radial distance linearly
C. Inverse of the radial distance
D. Elevation along vertical direction - In area meter (e.g., Rotameter), with increase in the fluid flow rate, the___________________?
A. Pressure drop increases linearly
B. Pressure drop is almost constant
C. Area through which fluid flows does not vary
D. None of these - The terminal velocity of a small sphere settling in a viscous fluid varies as the___________________?
A. First power of its diameter
B. Inverse of the fluid viscosity
C. Inverse square of the diameter
D. Square of the difference in specific weights of solid & fluid
