Volatile matter content in coking coal may be about __________ percent. 1 7 22 46 TRUE ANSWER : ? YOUR ANSWER : ?
When the coal is heated in absence of air, it is called its Deoxidation Gasification Coalification Carbonisation TRUE ANSWER : ? YOUR ANSWER : ?
Blast furnace gas compared to coke oven gas has Higher calorific value Lower ignition temperature Lower theoretical flame temperature Narrower limit of inflammability TRUE ANSWER : ? YOUR ANSWER : ?
Overfire burning in a furnace is a phenomenon characterised by the Supply of excess air Supply of excess fuel Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air None of these TRUE ANSWER : ? YOUR ANSWER : ?
A good metallurgical coke should have very low Fusion point of its ash Hardness & strength Sulphur & phosphorous content Porosity TRUE ANSWER : ? YOUR ANSWER : ?
Combustion of pulverised coal compared to the lumpy coal Provides higher thermal efficiency & flame temperature Provides better control of furnace temperature All of these Facilitates combustion with lower excess air TRUE ANSWER : ? YOUR ANSWER : ?
Fuel combustion is never cent per cent efficient due to Dry gas/stack gas loss Incomplete combustion Moisture loss All of these TRUE ANSWER : ? YOUR ANSWER : ?
A coal with high ash content Is not subjected to washing Has higher calorific value Is harder and stronger Has low quantity of mineral matter TRUE ANSWER : ? YOUR ANSWER : ?
Use of preheated air for combustion of fuel in the furnace, increases the None of these Calorific value of the fuel Scale losses of the furnace stock Flame temperature TRUE ANSWER : ? YOUR ANSWER : ?
Bomb calorimeter can be used to determine the __________ of the coal. Calorific value Neither A nor B Both A & B Sulphur content TRUE ANSWER : ? YOUR ANSWER : ?