3262. Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?
Vitrain
Clarain
Durain
Fussain
✅ The correct answer is option A.
3267. Which furnace consumes maximum refractory annually in an integrated steel plant ?
Soaking pit
Blastfurnace
L.D. converter
Coke ovens
✅ The correct answer is option C.
3276. Fireclay bricks are never used in the
beehive oven
coke oven walls
zinc roaster
lead blast furnace
✅ The correct answer is option B.
3281. ‘Wind loss’ resulting from unscientific storage of coal may be the order of about __________ percent.
2.5
7.5
10.5
14.5
✅ The correct answer is option A.
3286. Electrical resistor bars are made of
silicon carbide
alumina
zirconia
graphite
✅ The correct answer is option A.
3291. Higher percentage of ash in coal meant for the production of metallurgical grade coke
Decreases the hardness of coke
Decreases the abrasion resistance of coke
Causes brittleness in steel
None of these
✅ The correct answer is option D.
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.
3301. Calorific value of
Light paraffinic fuel oils is equal to that of equivalent olefins
N-paraffin is lower than that of iso-paraffins of the same compounds
Light paraffinic fuel oils is higher than that of equivalent olefins
Light paraffinic fuel oils is lower than that of equivalent olefins
✅ The correct answer is option C.
3307. Carbon refractories are exclusively used in the
hearth of blast furnace.
walls of coke oven.
regenerators of coke oven.
side wall of soaking pits.
✅ The correct answer is option A.