A. Weight heated/hr
B. Weight heated/furnace volume
C. Weight heated/hr/furnace volume
D. None of these
Furnace Technology
Cement Kiln is a___________________?
A. Rotary Kiln
B. Tunnel Kiln
C. Natural draft furnace
D. Batch furnace
The reason for excessive clinker formation in gas producers is the_____________________?
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.
Rotary kilns are used in the____________________?
A. Calcination of limestone & dolomite
B. Cement manufacture
C. Both A. and B.
D. Neither A. nor B.
The heating capacity of muffle furnace depends on the____________________?
A. Surface area & emissivity of the stock
B. Properties of the muffle wall (temperature, area, and emissivity)
C. Both A. & B.
D. Neither A. nor B.
Thermal efficiency of an open hearth furnace may be about _____________ percent?
A. 5
B. 20
C. 50
D. 80
Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about _____________ percent?
A. < 2
B. < 5
C. < 8
D. < 10
Fuel economy in an industrial furnace operation cannot be achieved by the use of__________________?
A. Stoichiometric combustion air
B. Non-preheated combustion air
C. Combustion air not enriched with oxygen
D. Recuperators
Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the__________________?
A. Physical nature, ash content and fineness of the coal
B. Amount of excess air supplied and load on the boiler
C. Type of burner and combustion chamber
D. All A., B. and C.
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as _____________ percent?
A. 50
B. 65
C. 85
D. 99
