3211. Grog
contains both alumina and silica.
iscrushed firebrick.
is a non-plastic material.
all (a), (b) and (c).
✅ The correct answer is option D.
Chemical Engineering
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3212. Bottom of basic open hearth furnace are constructed of
dead burnt magnesite ramming mass.
porous fireclay bricks.
semi-silica bricks.
silicon carbide bricks.
✅ The correct answer is option A.
3213. Which is a neutral refractory ?
Graphite
Magnesite chrome
Silica
Magnesia
✅ The correct answer is option A.
3214. Addition of grog in fireclay brick during its manufacture is advantageous, because it results in
less shrinkage in heating, decreased apparent porosity & increased specific gravity.
high strength & thermal spalling resistance.
less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production.
all (a), (b) and (c).
✅ The correct answer is option D.
3215. Which one expands on heating ?
Silica bricks
Fireclay bricks
Both (a) & (b)
Neither (a) nor (b)
✅ The correct answer is option A.
3216. Silicon carbide refractories are used in the
muffle furnace
zinc smelting furnace
ceramic recuperators
all (a), (b) and (c)
✅ The correct answer is option D.
3217. Chromite refractories are
acidic refractory.
neutral refractory.
basic refractory.
fired at a temperature of 600°C only.
✅ The correct answer is option B.
3218. Coke having higher porosity has
Lower bulk density
Lower strength
Higher reactivity
All of the above
✅ The correct answer is option D.
3219. A coal with high ash content is undesirable, as
It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber
The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the
The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes
All of the above
✅ The correct answer is option D.
3220. Short/intense flame is produced during combustion of gaseous fuel by using
High amount/current of combustion air
Low amount/current of combustion air
Preheated secondary air
Very little excess air
✅ The correct answer is option A.