Refractory Technology Mcqs for Chemical

Q.  Natural silica___________________?

a. Mainly contains quartz
b. Is not stable at high temperature
c. Transforms to other allotropic forms i.e. Tridymite and Cristobalite involving very high volume changes
d. All A., B. and C.


ANSWER: See Answer
 
No explanation is available for this question!
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MCQs:  Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as ______________ kg/cm2?
Category: Chemical Engineering Mcqs,   Published by: T-Code Scripts
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MCQs:  Crushing strength of a refractory____________________?
Category: Chemical Engineering Mcqs,   Published by: T-Code Scripts
MCQs:  Colour of fireclay bricks is_________________?
Category: Chemical Engineering Mcqs,   Published by: T-Code Scripts
MCQs:  Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?
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MCQs:  Highest melting (m.p = 3070°C) oxide refractory is__________________?
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Category: Chemical Engineering Mcqs,   Published by: T-Code Scripts
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Category: Chemical Engineering Mcqs,   Published by: T-Code Scripts
MCQs:  The maximum linear expansion of silica bricks during firing is about ______________ percent?
Category: Chemical Engineering Mcqs,   Published by: T-Code Scripts
MCQs:  Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?
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MCQs:  With decrease in porosity, the ______________ of the refractories decreases?
Category: Chemical Engineering Mcqs,   Published by: T-Code Scripts
MCQs:  ______________ bricks should not be used in oxidising atmosphere?
Category: Chemical Engineering Mcqs,   Published by: T-Code Scripts
MCQs:  Magnesite bricks have poor resistance to attack by _____________ slag?
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