CH138X Concepts Review

the ratio of shear stress to rate of shear strain is the __

• fluid velocity

• fluid characteristic of deformation

• fluid viscosity

• shear modulus

which of the following is a desirable trait of a manometric fluid?

• high polar liquid
• having a density lower that that of the metered fluid
• having a density greater that that of the metered fluid
• high viscosity

for a turbulent mass transfer in pipes, the sherwood number depends upon the reynolds number as

• Re^0.53
• Re
• Re^0.83
• Re^0.33

which factor leads to the decrease in average settling velocity of particles in hindered conditions compared to free settling?

• increase in fluid velocity
• increased fluid density
• interactions between particles
• less gravitational pull on particles

stroke's law is valid when the particle's reynold number is

• <0.1
• >0.1
• <1000
• >1000

this type of fluid displays an increase in velocity as the rate of shear strain is increased, regardless of time frames

• pseudoplastic
• rheopectic
• thixotropic
• dilatant

what size reduction pattern is brought about by the disintegration of a particle by two rigid forces

• compression
• fluid shear
• impact
• attrition

which of the following is a correct collection of units of thermal resistance?

• *R-h-BTU
• *R/(BTU-h)
• (*R-h)/BTU
• (*R-BTU)/h

for laminar fluid flow through a packed bed, how does the pressure drop across the bed change when the superficial fluid velocity is halved? Assume all other parameters remain constant.

• decrease by a factor of 2
• increase by a factor 4
• decrease by a factor of 4
• increase by a factor of 2

as particle size is reduced

• capacity of the screen is increased
• screening becomes progressively more difficult
• screen progressively becomes easier
• screening efficiency is increased