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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

All Topics  9594

Pick out the wrong statement?
A Fluxing material like lime is added in clay to reduce the vitrification temperature
B Main constituents of clay are alumina and silica
C Addition of sand in ceramic materials makes it non-plastic, increases its fusion point and
D Vitrification of fireclay material is done to increase its porosity
Correct Answer: Vitrification of fireclay material is done to increase its porosity
Pick out the wrong statement ?
A Electrical conductivity of refractory is not important, when these are to be used in electrical
B Graphite and metals are the good electrical conductor among the refractories and others are all
C Refractories used for lining electrical furnaces should ordinarily have very low electrical
D Electrical conductivity of porous refractory material is low
Correct Answer: Electrical conductivity of refractory is not important, when these are to be used in electrical
Pick out the wrong statement?
A Sand & coke is the main raw material for the manufacture of silicon carbide
B Carbon refractories cannot be used in the furnaces operating under reducing conditions
C Mullite can be obtained by the heating of alusite, kyanite or sillimanite
D Silica occurs in nature in all cellular, amorphous or crystalline form
Correct Answer: Carbon refractories cannot be used in the furnaces operating under reducing conditions
Pick out the wrong statement ?
A Refractories used in muffle furnace should have low thermal conductivity
B The electrical resistivity of refractories drops rapidly with rise in temperature
C For reducing spalling tendency, the refractory should be well fired and its porosity should be
D Refractoriness under load (RUL) of a refractory is always less than its refractoriness
Correct Answer: Refractories used in muffle furnace should have low thermal conductivity
Pick out the wrong statement?
A Insulating refractories used in place of regular refractory bricks are usually called light weight
B Graphite refractories are also called plumbago refractories
C Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28
D Calcined magnesite is also called dead burnt magnesite
Correct Answer: Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28
Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?
A Silicon carbide
B Silicon nitride
C Crystalline magnesia
D Zirconium sulphate
Correct Answer: Silicon carbide
Permeability of bricks is a measure of the_________________?
A Refractoriness
B Melting point
C Rate at which a fluid will pass through the pores
D Expansion during heating
Correct Answer: Rate at which a fluid will pass through the pores
Fireclay bricks are not used in the_____________________?
A Blast furnace
B Hot blast stove
C Cupola
D Wall of coke oven
Correct Answer: Wall of coke oven
Which form of silica has the highest specific gravity ?
A Quartz
B Cristobalite
C Tridymite
D All have the same specific gravity
Correct Answer: Quartz
Thermal conductivity of refractory bricks_________________?
A Increases with decrease in porosity
B Decreases with decreases in porosity
C Is independent of its porosity and is maximum for insulating bricks
D Increases with the amount of air entrapped in pores
Correct Answer: Increases with decrease in porosity
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