silica
fireclay
dolomite
magnesite
✅ The correct answer is option A.
Engineering
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3062. Chemically, mullite refractories is
3Al2O3.2SiO2
Al2O3
ZrSO4
ThO2
✅ The correct answer is option A.
3063. Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.
Colour
Moisture content
Ash content
Volatile matter
✅ The correct answer is option D.
3064. The cooling medium used in dry quenching of coke is
Nitrogen
Air
Phenolic water
Carbon dioxide
✅ The correct answer is option A.
3065. Coke oven gas burns with an yellowish flame, because of the presence of
CO₂
CH₄
H₂
NH₃
✅ The correct answer is option B.
3066. The main advantage of forced draft over natural draft is that
Combustion of fuel is complete
Smaller height chimney can be used
Furnace control is easier
All of the above
✅ The correct answer is option D.
3067. In low temperature carbonisation (as compared to high temperature carbonisation) of coal
Ammonia yield is more
Aliphatic tar is produced
Free carbon in tar is more
All of the above
✅ The correct answer is option B.
3068. Beehive coke oven
Facilitates by-products recovery
Takes 2-3 days for coking of coal but requires no external fuel for heating
Gives larger yield of coke (around 85%) as compared to by-product ovens
Produces coke with very poor strength
✅ The correct answer is option B.
3069. Softening temperature of coal ash is a measure of the __________ of coal.
Caking tendency
Coking tendency
Clinkering tendency
Size stability
✅ The correct answer is option C.
3070. Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?
50
70
85
100
✅ The correct answer is option D.