In a furnace employing forced draught as compared to induced draught, Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced The fan operates hot and hence blades are liable to corrosion and erosion None of these Positive pressure exists in the furnace TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace? Ceramic recuperator Regenerator Waste heat boiler Economiser 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 Transportation of coal Preheating the primary air Drying of coal TRUE ANSWER : ? YOUR ANSWER : ?
Advantages of use of preheated combustion air are Saving in fuel consumption Reduction in scale losses All of these Increase in flame temperature TRUE ANSWER : ? YOUR ANSWER : ?
The heat recoverable from flue gases of furnaces depends on the Quantity of flue gases Flue gas temperature drop through the furnace All of these Thermal efficiency of furnace TRUE ANSWER : ? YOUR ANSWER : ?
While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C. 3000 4500 2000 6000 TRUE ANSWER : ? YOUR ANSWER : ?
Regenerators compared to the recuperators for the same duty Are less costly Occupy more space Are of smaller size All of these TRUE ANSWER : ? YOUR ANSWER : ?
Pulverised fuel fired furnaces employ __________ fuel firing. Horizontal All of these Tangential Vertical TRUE ANSWER : ? YOUR ANSWER : ?
In order to maintain a reducing atmosphere in a furnace, it should have None of these CO in flue gas High excess air No O₂ in flue gas TRUE ANSWER : ? YOUR ANSWER : ?