In low or standard frequency induction furnace, heat is produced by the Induction and resistance None of these Current flow through a heating element Combination of induced current and skin effect TRUE ANSWER : ? YOUR ANSWER : ?
Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent. 65 20 80 40 TRUE ANSWER : ? YOUR ANSWER : ?
Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C. 250 1000 650 850 TRUE ANSWER : ? YOUR ANSWER : ?
In salt bath furnace, heat is transferred to the charge mainly by Convection None of these Radiation Conduction TRUE ANSWER : ? YOUR ANSWER : ?
Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C. 40 20 5 60 TRUE ANSWER : ? YOUR ANSWER : ?
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent. 65 99 85 50 TRUE ANSWER : ? YOUR ANSWER : ?
In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of Imperfect mixing of fuel & air and infiltration of air Use of pulverised solid fuels Use of non-preheated combustion air Use of excessive positive draft in the furnace TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the most suitable for preheating combustion air above 650°C ? Regenerator Metallic recuperator None of these Ceramic recuperator TRUE ANSWER : ? YOUR ANSWER : ?
Which one is not an induced draught furnace? None of these Blast furnace stove Sintering furnace High pressure boiler TRUE ANSWER : ? YOUR ANSWER : ?
Which is a continuous furnace? Glass tank furnace None of these Annealing furnace Coke ovens TRUE ANSWER : ? YOUR ANSWER : ?