Decreases the hardness of coke
Decreases the abrasion resistance of coke
Causes brittleness in steel
None of these
✅ The correct answer is option D.
Engineering
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3292. Presence of nitrogen in combustion air does not reduce the
Amount of heat liberated
Flame temperature
Flue gas temperature
Any of the above
✅ The correct answer is option A.
3293. Ganister is a source of the
silica
periclase
lime
none of these
✅ The correct answer is option A.
3294. Refractory castables are used for
producing monolithic linings.
patch work.
minimising the number of joints in the structure.
all (a), (b) and (c).
✅ The correct answer is option D.
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.
3296. Dilatometer is used for the determination of __________ of refractories.
modulus of rupture
permanent linear change
resistance to CO attack
RUL
✅ The correct answer is option B.
3297. Zirconia refractories are not used in
making sheaths for thermocouple.
lining high temperature ceramic kilns.
furnaces subjected to fluctuating temperature.
high frequency induction furnaces in the form of inductors.
✅ The correct answer is option C.
3298. Low temperature oxidation of stored coal results in the
Decrease in its caking power & calorific value
Decrease in its carbon & hydrogen content
Increase in its oxygen content
All of the above
✅ The correct answer is option D.
3299. Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
Sulphur
Oxygen
Hydrogen
Carbon
✅ 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.