Thermal efficiency of furnaces can be improved by Maintaining proper draught All of these Waste heat recovery from flue gas Minimising heat losses from furnace walls TRUE ANSWER : ? YOUR ANSWER : ?
Heat transfer rate to the stock/charge in the furnace does not depend upon the Use of waste heat recovery equipments Emissivity of the refactory walls Size of the furance Thickness of the stock TRUE ANSWER : ? YOUR ANSWER : ?
Thermal efficiency of an open hearth furnace may be about __________ percent. 5 20 80 50 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 : ?
Which of the following is a batch furnace? Glass tank furnace Cupola None of these Reheating furnace TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following furnaces will have maximum thermal efficiency? Boiler furnace Rotary kilns Soaking pits Walking beam reheating furnace 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 : ?
Scaling of furnace stock is reduced by __________ in flue gas. H₂ High CO/CO₂ CO All of these TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not a directly fired furnace? By-product coke oven Calcination kiln Sintering furnace Open hearth furnace TRUE ANSWER : ? YOUR ANSWER : ?
An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace. Tunnel Rotary hearth Shaft Walking beam TRUE ANSWER : ? YOUR ANSWER : ?