Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing? Erosion of induced draft fan blades High power consumption in its transportation Ash disposal problem Excessive fly-ash discharge from the stack TRUE ANSWER : ? YOUR ANSWER : ?
With increase in calorific value of fuels, their adiabatic flame temperatures Remain unchanged May increase or decrease ; depends on the quantity of products of combustion Increase Decrease TRUE ANSWER : ? YOUR ANSWER : ?
Overfire burning in a furnace is a phenomenon characterised by the Supply of excess fuel None of these Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air Supply of excess air TRUE ANSWER : ? YOUR ANSWER : ?
Octane number of 2, 2, 4 - trimethyl pen-tane is More than 100 100 In between 0 and 100 TRUE ANSWER : ? YOUR ANSWER : ?
Gross and net calorific value of a fuel will be the same Ifits carbon content is very low If its ash content is zero Under no circumstances If its hydrogen/hydrogen compound content is zero TRUE ANSWER : ? YOUR ANSWER : ?
Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in Ammoniacal cuprous chloride KOH Pyrogallol solution None of these 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. < 37% None of these In between 37 & 71% >71% TRUE ANSWER : ? YOUR ANSWER : ?
The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be 42.9 47.3 27.6 23 TRUE ANSWER : ? YOUR ANSWER : ?
A coal containing high amount of volatile matter will have Low adiabatic flame temperature Very little ash content Low ignition temperature High fusion point of its ash TRUE ANSWER : ? YOUR ANSWER : ?
A coal having higher volatile matter content, has lower Ignition temperature Smoking tendency on burning Coke oven gas yield on carbonisation Chance of catching fire during storage in open space TRUE ANSWER : ? YOUR ANSWER : ?