Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an_________________? A. Economiser B. Steam superheater C. Air preheaterD. All A., B. and C.
Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ? A. EconomiserB. Regenerator C. Ceramic recuperator D. Waste heat boiler
Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace ? A. Increase in calorific value of the fuel B. Increase in flame temperature C. Reduction in scale…
An example of a periodic furnace is the__________________? A. Blast furnace stoves B. Blast furnace C. Coke oven heating chamber D. Rotary kilns
Which of the following variables does not affect the furnace capacity ? A. Size of the furnace B. Gas velocity in furnace C. Ratio of wall surface to surface of stockD. None of these
Circulation of gases in furnace is caused by the_________________? A. Change in volume during a change of temperature B. Difference in density between hot and cold gases C. Furnace pressure in conjunction with draft in fluesD. All A., B. and…
Which is not accomplished in an underfired furnace ? A. Increase in heating capacity/m2 of floor space B. Elimination of cold spot at the bottom of the charge C. Reduction in the temperature of furnace gases D. Protection of the…
The purpose of controlling the furnace atmosphere is to prevent surface attack by__________________? A. Oxidation/scaling B. Decarburising C. Sulphur penetrationD. Either of the above
Regenerators as compared to recuperators for the same duty_________________? A. Store smaller quantity of waste heat B. Are lighter & compactC. Involve higher initial cost D. All A., B. & C.
Dampers are located__________________? A. Before the I.D fan B. After the I.D. fan C. Near the top of the chimney D. Anywhere after the I.D. fan