Turndown ratio of a burner gives an idea of the ______________ in the furnace?

A. Open hearth furnace
B. Muffle furnace
C. Soaking pit
D. Reheating furnace

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

A. Use of coal/coke containing a high % of fines and ash
B. Use of fuel having too low an ash fusion temperature
C. Development of hot spots in the fuel bed and an abnormally high rate of gasification
D. All A., B. and C.

A. kcal/hr/m3 combustion space
B. kcal/m3 combustion space
C. kcal/hr
D. None of these