Which of the following is not an additive for flue gases from furnace to reduce its dew-point? Fine dolomite Ammonia Alkaline powders None of these TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is a natural draft furnace? Power plant boilers Sintering furnace None of these Blast furnace stoves TRUE ANSWER : ? YOUR ANSWER : ?
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of Combustion of coal by supplying it around the burner Drying of coal Preheating the primary air Transportation of coal TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace? Increase in flame temperature Saving in fuel consumption Increase in calorific value of the fuel Reduction in scale losses TRUE ANSWER : ? YOUR ANSWER : ?
Maximum heat transfer in high temperature furnaces is by Either A, B or C; depends on the type of furnace Radiation Conduction Convection TRUE ANSWER : ? YOUR ANSWER : ?
The purpose of controlling the furnace atmosphere is to prevent surface attack by Sulphur penetration Oxidation/scaling Either of the above Decarburising TRUE ANSWER : ? YOUR ANSWER : ?
In which of the following furnaces, the gases are sucked through the stock bed from below? Beehive oven None of these Sintering machine Soaking pit TRUE ANSWER : ? YOUR ANSWER : ?
Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C. 650 1000 850 250 TRUE ANSWER : ? YOUR ANSWER : ?
Regenerators compared to the recuperators for the same duty Are less costly Are of smaller size All of these Occupy more space TRUE ANSWER : ? YOUR ANSWER : ?
Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of Blast furnace gas with oxygen Furnace oil with air Blast furnace gas with air Furnace oil with oxygen TRUE ANSWER : ? YOUR ANSWER : ?