All Free Chemical Engineering MCQs with Answers
Every Chemical Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
6,983 questions · page 319 of 350
- A. 1520-1630
- B. 1630-1670
- C. > 2000
- D. > 1730
Explanation: Superduty refractories withstand fusion temperatures above approximately 1730°C.
Correct answer: > 1730- A. Buckstay
- B. Breast wall
- C. Armouring
- D. Baffle
Explanation: A buckstay is a steel structural member placed around furnace walls to resist the outward thrust of the brickwork.
Correct answer: Buckstay- A. Magnesite
- B. Fireclay
- C. Forsterite
- D. Chromite
Explanation: Fireclay is an acidic aluminosilicate refractory, not a basic refractory.
Correct answer: Fireclay- A. 1520
- B. 1630
- C. 1670
- D. 1730
Explanation: A Seger cone number above 33 indicates a refractoriness exceeding roughly 1730°C. Therefore the matching temperature range is above 1730°C.
Correct answer: 1730- A. Coke oven regenerators
- B. Muffle furnace
- C. Recuperators
- D. Blast furnace
Explanation: High thermal conductivity is desirable in regenerators and recuperators, where heat must be transferred rapidly.
Correct answer: Blast furnace- A. Subjected to temperature fluctuation
- B. Required to resist corrosive basic slag
- C. Subjected to high load
- D. None of these
Explanation: Magnesite is a basic refractory and resists attack by corrosive basic slags.
Correct answer: Required to resist corrosive basic slag- A. Beehive oven
- B. Zinc roaster
- C. Coke oven walls
- D. Lead blast furnace
Explanation: Fireclay bricks are suitable for several furnace linings, but coke ovens require silica-brick walls because silica refractories withstand…
Correct answer: Coke oven walls- A. Depends on the nature of slag & refractory
- B. Decreases at higher temperature
- C. Decreases, if defective joints & cracks exist in the refractory
- D. All A., B. and C.
Explanation: Slag corrosion depends on chemical compatibility between the slag and refractory, and higher temperature generally accelerates attack.
Correct answer: All A., B. and C.- A. Tar dolomite bricks
- B. Mullite bricks
- C. Fireclay bricks
- D. High alumina bricks
Explanation: Fireclay, mullite and high-alumina bricks are alumino-silicate refractories.
Correct answer: Tar dolomite bricks- A. Fusion point
- B. Specific gravity
- C. RUL
- D. None of these
Explanation: Specific gravity indicates the extent of conversion of silica minerals during firing; properly fired silica brick generally has the…
Correct answer: Specific gravity6371. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?
- A. Fireclay bricks
- B. Tar bonded dolomite bricks
- C. Mullite bricks
- D. Magnesite bricks
Explanation: Tar-bonded dolomite bricks can deteriorate through moisture-related hydration of free lime and magnesia, so temperature and humidity must…
Correct answer: Tar bonded dolomite bricks- A. Rotary kilns
- B. None of these
- C. Sun
- D. Tunnel kilns
Explanation: Refractory green shapes are dried under controlled conditions in tunnel kilns or tunnel driers before firing, which prevents rapid…
Correct answer: Tunnel kilns- A. Silicon carbide
- B. Alumina
- C. Zirconia
- D. Graphite
Explanation: Silicon carbide is electrically conductive and retains strength at high temperature, making it suitable for resistance-heating bars and…
Correct answer: Silicon carbide- A. Direct bonded basic
- B. Fireclay
- C. Silica
- D. Magnesite
Explanation: Fireclay bricks are fired at approximately 1250–1400°C, lower than the usual firing temperatures for silica and basic magnesia…
Correct answer: Fireclay- A. Silicon carbide
- B. Chromite
- C. Magnesite
- D. Graphite
Explanation: Magnesite is a basic refractory because its principal component is magnesium oxide, MgO.
Correct answer: Magnesite- A. Tridymite
- B. Cristobalite
- C. None of these
- D. Quartz
Explanation: Quartz is the stable silica modification at lower temperatures, up to about 870°C under the simplified refractory classification used…
Correct answer: Quartz- A. Increases
- B. Remains unchanged
- C. Decreases linearly
- D. Decreases
Explanation: Alumina has a very high melting point and increases the high-temperature stability of firebricks.
Correct answer: Increases- A. 1380
- B. 1520
- C. 1710
- D. 1915
Explanation: Seger cone 32 corresponds approximately to 1710°C, placing it among the high-temperature silica-brick refractoriness grades.
Correct answer: 1710- A. Fireclay
- B. Carborundum
- C. Chromite
- D. Graphite
Explanation: Graphite conducts electricity well because it has mobile electrons in its layered structure.
Correct answer: Graphite6380. Grog__________________?
- A. All A., B. and C.
- B. Is crushed firebrick
- C. Is a non-plastic material
- D. Contains both alumina and silica
Explanation: Grog is calcined and crushed refractory material, commonly crushed firebrick; it is non-plastic and mainly contains alumina and silica.
Correct answer: All A., B. and C.