- (A) 500
- (B) 1500
- (C) 6500
- (D) 20000
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- (A) Controlling the excess air
- (B) Oxygen enrichment of combustion air
- (C) Using low c.v. fuels
- (D) Maintaining proper draft in the furnace
- (A) Back draughting
- (B) Banking
- (C) Under pressurising
- (D) None of these
- (A) Decreases the hardness of coke
- (B) Decreases the abrasion resistance of coke
- (C) Causes brittleness in steel
- (D) None of these
- (A) 500
- (B) 750
- (C) 950
- (D) 1100
- (A) Facilitates by-products recovery
- (B) Takes 2-3 days for coking of coal but requires no external fuel for heating
- (C) Gives larger yield of coke (around 85%) as compared to by-product ovens
- (D) Produces coke with very poor strength
- (A) If its ash content is zero
- (B) If its carbon content is very low
- (C) If its hydrogen/hydrogen compound content is zero
- (D) Under no circumstances
- (A) Hydrogenation
- (B) Gasification
- (C) Carbonisation
- (D) None of these
- (A) Is friable, charcoal like substance
- (B) Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
- (C) Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation
- (D) All
- (A) 30
- (B) 50
- (C) 75
- (D) 95
