The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle) ?
Correct answer: A. 6/D.ρ
- A. 6/D.ρ
- B. 2/D.ρ
- C. 4/D.ρ
- D. 12/D.ρ
Explanation
For a sphere, surface area divided by volume is πD² divided by πD³/6, giving 6/D; dividing by density gives the mass-based specific surface, 6/(Dρ). Hence option A represents the usual formula.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Chemical Process Principles
2,710 free Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Chemical Process Principles questions
Trommels are revolving screens which normally operate in the range of _______________ rpm?
Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the_____________________?
For sizing of fine materials, the most suitable equipment is a____________________?
The main differentiation factor between tube mill and ball mill is the ___________________?
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called _____________ is produced?