Refractory and Polymer Technology MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Refractory and Polymer Technology, a fundamental topic in the field of Basic Chemical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Refractory and Polymer Technology MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Refractory and Polymer Technology mcq questions that explore various aspects of Refractory and Polymer Technology problems. Each MCQ is crafted to challenge your understanding of Refractory and Polymer Technology principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Basic Chemical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Refractory and Polymer Technology MCQs are your pathway to success in mastering this essential Basic Chemical Engineering topic.

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Refractory and Polymer Technology MCQs | Page 25 of 52

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Q241.
Fireclay refractories

a.

are not resistant to the action of basic slags.

b.

combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc.

c.

shrink during firing

d.

all (a), (b) and (c)

Discuss
Answer: (d).all (a), (b) and (c)
Q242.
Which is not a high alumina refractory ?

a.

Mullite

b.

Corrundum

c.

Bauxite

d.

Dolomite

Discuss
Answer: (d).Dolomite
Q243.
Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.

a.

Beryllia

b.

Carborundum

c.

Corundum

d.

Thoria

Discuss
Answer: (a).Beryllia
Q244.
Faster rate of drying of moulded refractories results in high __________ of refractories.

a.

green strength

b.

voids

c.

shrinkage

d.

both (b) and (c)

Discuss
Answer: (d).both (b) and (c)
Q245.
Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.

a.

preheating

b.

cooling

c.

burning

d.

all

Discuss
Answer: (c).burning
Q246.
The highest melting pure oxide (m.p. > 3000°C) is

a.

thoria

b.

alumina

c.

beryllia

d.

zirconia

Discuss
Answer: (a).thoria
Q247.
In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.

a.

700

b.

1000

c.

1600

d.

2000

Discuss
Answer: (c).1600
Q248.
Which is not an acidic refractory ?

a.

Silica

b.

Fireclay

c.

High alumina refractory

d.

Carbon black

Discuss
Answer: (d).Carbon black
Q249.
Natural silica

a.

mainly contains quartz.

b.

is not stable at high temperature.

c.

transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes.

d.

all (a), (b) and (c).

Discuss
Answer: (d).all (a), (b) and (c).
Q250.
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.

Discuss
Answer: (a).increases with decrease in porosity.
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