As the equilibrium moisture content of the coal increases, its Bulk density decreases Swelling number decreases Swelling number increases Calorific value increases TRUE ANSWER : ? YOUR ANSWER : ?
Incomplete combustion of a fuel is characterised by the high __________ in the flue gas. Oxygen Temperature Carbon monoxide Smoke TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not a product of tar distillation? Phenol & naphthalene None of these Anthracene & creosote Benzol & pitch TRUE ANSWER : ? YOUR ANSWER : ?
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about 25000 kcal/kg Same as that of coal middling 8800 kcal/kg 8800 kcal/m³ TRUE ANSWER : ? YOUR ANSWER : ?
Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300° ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air. 20 10 5 35 TRUE ANSWER : ? YOUR ANSWER : ?
During coking of coal, the ash content (percentage) Decreases Remains constant None of these Increases TRUE ANSWER : ? YOUR ANSWER : ?
Blast furnace gas constitutes mainly of N₂ & CO N₂ & CH₄ CH₄ & CO₂ N₂ & H₂ TRUE ANSWER : ? YOUR ANSWER : ?
Safe condition for storage of high V.M. bituminous coal is that Both A and B Maximum 200 tons should be stored in a heap Height of the coal heap should be < 3 metres Neither A nor B TRUE ANSWER : ? YOUR ANSWER : ?
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has Both A & B Higher calorific value Lower hydrogen content Neither A nor B TRUE ANSWER : ? YOUR ANSWER : ?
Low temperature carbonisation of coal produces Soft coke Very low calorific value coke oven gas Metallurgical coke No by-products TRUE ANSWER : ? YOUR ANSWER : ?