3290. Which of the following gaseous fuels is likely to have the highest gross calorific value?
Sewage gas
LPG
Producer gas
Natural gas
✅ The correct answer is option B.
3295. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.
fireclay
silica
dolomite
very low alumina
✅ The correct answer is option B.
3300. Calorific value of coke oven gas is around __________ Kcal/Nm³.
900
4200
7500
2000
✅ The correct answer is option B.
3306. Hot face insulating linings of high purity alumina fused mullite are used, where
very high temperatures are involved.
highly reducing conditions are involved.
presence of iron or silica is harmful.
all (a), (b) and (c).
✅ The correct answer is option D.
3311. Combustion reaction of fuels is a/an __________ reaction.
Auto catalytic
Exothermic
Endothermic
None of these
✅ The correct answer is option B.
3316. Roof of a basic electric furnace is made of __________ bricks.
superduty fireclay
silica
chromite
none of these
✅ The correct answer is option B.
3321. Calorific value of of blast furnace gas is around __________ KCal/Nm³.
850
1800
4200
6500
✅ The correct answer is option A.
3324. Fireclay refractories
are not resistant to the action of basic slags.
combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc.
shrink during firing
all (a), (b) and (c)
✅ The correct answer is option D.
3328. High temperature in gasification of coal favours
High production of CO₂
Low production of CO₂
High production of CO
Both B and C
✅ The correct answer is option D.
3257. Tar dolomite bricks are used in the
basic Bessemer converter
basic open hearth furnace
electric furnaces
all (a), (b) and (c)
✅ The correct answer is option D.