With increase in the temperature of carbonisation of coal Methane content in the coke oven gas decreases and carbon monoxide content increases Hydrogen content of coke oven gas increases due to cracking of hydrocarbons All of these Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content TRUE ANSWER : ? YOUR ANSWER : ?
Natural draught produced by a chimney depends upon the Height of the chimney Neither A nor B Density of the chimney gases Both A & B TRUE ANSWER : ? YOUR ANSWER : ?
Gross and net calorific value of a fuel will be the same Ifits carbon content is very low If its hydrogen/hydrogen compound content is zero Under no circumstances If its ash content is zero TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not a by-product recovered in a high temperature coal carbonisation plant? Pitch-cresosote mixture (PCM) Benzol Ethylene Napthalene TRUE ANSWER : ? YOUR ANSWER : ?
Removal of hydrogen from coke oven gas Increases its calorific value Decreases its calorific value Is not possible on commerical scale Does not alter its calorific value TRUE ANSWER : ? YOUR ANSWER : ?
Atomising steam to fuel oil ratio in a burner should be around 3.5 1.5 0.5 2.5 TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing? Ash disposal problem Excessive fly-ash discharge from the stack High power consumption in its transportation Erosion of induced draft fan blades TRUE ANSWER : ? YOUR ANSWER : ?
Caking index of coal blend used for blast furnace coke making is about 8 12 22 36 TRUE ANSWER : ? YOUR ANSWER : ?
Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent. >71% In between 37 & 71% < 37% None of these TRUE ANSWER : ? YOUR ANSWER : ?
Coking time in narrow by-product coke ovens is around __________ hours. 48 18 8 80 TRUE ANSWER : ? YOUR ANSWER : ?