Most Latest Refractory Technology MCQs – Chemical Engineering MCQs
This post is comprising of latest ” Refractory Technology MCQs – Latest Competitive Chemical Engineering MCQs “. Here you’ll get latest mechanical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding mechanical engineering then read these mcqs of Design of Steel Structures.
Latest Chemical Engineering MCQs
By practicing these MCQs of Refractory Technology MCQs – Latest Competitive Chemical Engineering MCQs , an individual for exams performs better than before. This post comprising of mechanical engineering objective questions and answers related to “Refractory Technology Mcqs “. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of mechanical engineering to approach the success. Tab this page to check “Refractory Technology Mcqs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others.
Latest Refractory Technology Mcqs
The most occurred mcqs of Refractory Technology in past papers. Past papers of Refractory Technology Mcqs. Past papers of Refractory Technology Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Refractory Technology Mcqs. The Important series of Refractory Technology Mcqs are given below:
Fireclay refractories____________________?
A. Shrink during firing
B. Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc
C. Are not resistant to the action of basic slags
D. All A., B. and C.
Fireclay bricks is not used for lining the__________________?
A. Gas producer
B. Cupola
C. Bottom of hot metal mixer
D. Roof of open hearth furnace
In panel test for spalling resistance, the average face temperature of panel assembly is maintained at ______________ °C for 24 hours?
A. 1000
B. 700
C. 1600
D. 2000
Which is an acidic refractory ?
A. Dolomite
B. Magnesite
C. Fireclay
D. Chrome magnesite
Which is not an acidic refractory ?
A. Fireclay
B. Silica
C. High alumina refractory
D. Carbon black
Fireclay bricks are used in the__________________?
A. Coke oven walls
B. Outer lining of L.D. converter
C. Hearth bottom of blast furnace
D. Coke ovens regenerator
Process Control And Instrumentation Mcqs
Fusion point of a basic refractory material is__________________?
A. Reduced by the addition of acid oxides
B. Not affected by the addition of acid oxides
C. Increased by the addition of acid oxides
D. Always less than 1000°C
Thermal conductivity of refractory bricks_________________?
A. Increases with decrease in porosity
B. Increases with the amount of air entrapped in pores
C. Is independent of its porosity and is maximum for insulating bricks
D. Decreases with decreases in porosity
Which form of silica has the highest specific gravity ?
A. Quartz
B. Tridymite
C. Cristobalite
D. All have the same specific gravity
Fireclay bricks are not used in the_____________________?
A. Hot blast stove
B. Blast furnace
C. Cupola
D. Wall of coke oven
Permeability of bricks is a measure of the_________________?
A. Melting point
B. Refractoriness
C. Rate at which a fluid will pass through the pores
D. Expansion during heating
Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?
A. Silicon carbide
B. Crystalline magnesia
C. Silicon nitride
D. Zirconium sulphate
Pick out the wrong statement?
A. Calcined magnesite is also called dead burnt magnesite
B. Graphite refractories are also called plumbago refractories
C. Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28
D. Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks
Pick out the wrong statement ?
A. Refractories used in muffle furnace should have low thermal conductivity
B. For reducing spalling tendency, the refractory should be well fired and its porosity should be more
C. The electrical resistivity of refractories drops rapidly with rise in temperature
D. Refractoriness under load (RUL) of a refractory is always less than its refractoriness
Pick out the wrong statement?
A. Silica occurs in nature in all cellular, amorphous or crystalline form
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. Sand & coke is the main raw material for the manufacture of silicon carbide
Refractory Technology Mcqs
Pick out the wrong statement ?
A. Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces
B. Electrical conductivity of porous refractory material is low
C. Refractories used for lining electrical furnaces should ordinarily have very low electrical conductivity
D. Graphite and metals are the good electrical conductor among the refractories and others are all electrical insulators
Pick out the wrong statement?
A. Main constituents of clay are alumina and silica
B. Fluxing material like lime is added in clay to reduce the vitrification temperature
C. Addition of sand in ceramic materials makes it non-plastic, increases its fusion point and reduces its shrinkage on burning
D. Vitrification of fireclay material is done to increase its porosity
Pick out the wrong statement ?
A. Ceramic materials are brittle in nature
B. Ceramic materials do not undergo vitrification on heating
C. A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscous state is termed s glass
D. Non-oxide ceramic materials generally act as a semi-conductor