The main function of a muffle in the muffle furnace is to Neither A nor B Smooth out temperature inequalities on the combustion side of the muffle wall Protect the charge from the effects of the products of combustion Both A & B TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the most suitable for preheating combustion air above 650°C ? Ceramic recuperator None of these Metallic recuperator Regenerator TRUE ANSWER : ? YOUR ANSWER : ?
Rate of heat release in a furnace, which is the measure of heat intensity is defined as Kcal/hr/m³ combustion space Kcal/m³ combustion space Kcal/hr None of these TRUE ANSWER : ? YOUR ANSWER : ?
Maximum heat transfer in high temperature furnaces is by Either A, B or C; depends on the type of furnace Convection Conduction Radiation TRUE ANSWER : ? YOUR ANSWER : ?
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of Drying of coal Combustion of coal by supplying it around the burner Preheating the primary air Transportation of coal TRUE ANSWER : ? YOUR ANSWER : ?
Which furnace employs natural draft? Coke oven Boiler Rotary kilns L.D. converter TRUE ANSWER : ? YOUR ANSWER : ?
Circulation of gases in furnace is caused by the Furnace pressure in conjunction with draft in flues All of these Difference in density between hot and cold gases Change in volume during a change of temperature TRUE ANSWER : ? YOUR ANSWER : ?
Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an Annealing furnace Salt bath furnace Steam boiler Blast furnace TRUE ANSWER : ? YOUR ANSWER : ?
Turndown ratio of a burner gives an idea of the __________ in the furnace. Range of fuel firing rates Minimum heat input rate only Maximum heat input rate only Volume of the combustion chamber TRUE ANSWER : ? YOUR ANSWER : ?
The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent. 40 70 85 15 TRUE ANSWER : ? YOUR ANSWER : ?