Protective gas used in the annealing furnace for steel coil comprises of__________________?

Related Mcqs:

In salt bath furnace, heat is transferred to the charge mainly by __________________?

A. Conduction B. Convection C. Radiation D. None of these...

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 ?

A. 5 B. 60 C. 20 D. 40...

The rate of scaling of furnace stock depends upon the_________________?

A. Temperature B. Time C. Nature of atmosphere D. All A., B. and C....

Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by______________________?

A. Preheating the combustion air B. Oxygen enrichment of combustion air C. Preheating the fuel gas D. All A., B. & C....

To reduce the stack loss, heat recovery from flue gas can be done by_____________________?

A. Preheating of cold stock B. Preheating of combustion air C. Steam generation in waste heat boilers D. All A., B. and C....