850
1800
4200
6500
✅ The correct answer is option A.
Engineering
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3322. Which is required in an insulating refractory ?
High thermal conductivity
Low porosity
Both (a) and (b)
Neither (a) nor (b)
✅ The correct answer is option D.
3323. Calorific value as determined by bomb calorimeter is the
Higher calorific value at constant volume
Gross calorific value at constant pressure
Lower calorific value at constant pressure
Net calorific value at constant volume
✅ 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.
3325. The main raw material for manufacture of silicon carbide refractories is
corrundum
carborundum
bauxite
periclase
✅ The correct answer is option B.
3326. Gross calorific value will be equal to the net calorific value for
H₂
C₂H₂
CO
C₂H₆
✅ The correct answer is option C.
3327. Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to
thermal spalling
slag attack
fusion under load
CO attack
✅ The correct answer is option A.
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.
3329. Which of the following is not a manufactured fuel ?
Furnace oil
Bagasse
Semi-coke
Kerosene
✅ The correct answer is option B.
3330. Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.
silica
fireclay
magnesite
zirconia
✅ The correct answer is option B.