Fluid Mechanics for Chemical MCQs

724 MCQs  — Chemical Engineering MCQs  (Page 16 of 73)

In hindered settling, the particles are_________________________?
A. Placed farther from the wall
B. Not affected by other particles and the wall
C. Near each other
D. None of these
The Prandtl mixing length is_________________?
A. Zero at the pipe wall and is a universal constant
B. Independent of radial distance from the pipe axis
C. Independent of the shear stress
D. Useful for computing laminar flow problems
The distribution of shear stress in a stream of fluid in a circular tube is_____________________?
A. Linear with radius for turbulent flow only
B. Linear with radius for laminar flow only
C. Linear with radius for both laminar & turbulent flow
D. Parabolic with radius for both laminar & turbulent flow
Which of the following is dimensionless ?
A. Angular velocity
B. Fanning friction factor
C. Specific volume
D. None of these
A floating/submerged body is always stable, if its centre of gravity___________________?
A. Lies above its centre of buoyancy
B. And centre of buoyancy coincide
C. Lies below its centre of buoyancy
D. Lies above its metacentre
Boundary layer separation is caused by the ____________________?
A. Reduction of pressure below vapour pressure
B. Reduction of pressure gradient to zero
C. Adverse pressure gradient
D. Reduction of boundary layer thickness to zero
Which of the following conditions must be satisfied for lift force to be developed ?
A. The body should be bluff body
B. The body should be stream lined
C. Circulation around the body is essentially required
D. The main stream velocity must approach the velocity of sound in that fluid medium
Diaphragm valves are used for handling _______________ fluids?
A. Corrosive
B. Viscous
C. Non-newtonian
D. Solid suspended