Porosity is induced in insulating refractories by adding________________?
Correct answer: D. All A., B. and C.
- A. Powdered naphthalene
- B. Ammonium chloride/sulphate
- C. Calcium phosphate
- D. All A., B. and C.
Explanation
Porosity is created when pore-forming additives decompose, volatilise or burn out during firing. Powdered naphthalene, ammonium salts and calcium phosphate can all serve this purpose.
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
Machine moulding of dry mixture of refractories requires a pressure of the order of _____________ kg/cm2?
Carbon bricks are not used in the lining of the_________________?
Grog addition in fireclay during brick manufacture is done to_________________?
Segar cones are used for the determination of ____________ of refractories?
Fusion point of an acidic refractory material is________________?
An ideal refractory should have high__________________?