A. Calcination of limestone & dolomite
B. Cement manufacture
C. Both A. and B.
D. Neither A. nor B.
Related Mcqs:
- Thermal efficiency of a limestone calcination rotary kiln may be around ______________ percent?
A. 20
B. 40
C. 65
D. 80 - 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. - In producer gas making furnace, steam is added along with air to mainly control the____________________?
A. Fusion of coal ash & clinker formation
B. C. V. of producer gas
C. Temperature of producer gas
D. Tar content in producer gas - Regenerators are normally provided in the____________________?
A. Glass melting furnace
B. Open hearth furnace
C. By product coke ovens
D. All A., B. and C. - Flue gas outlet temperature from the chimney of any furnace should be ideally about ______________ °C?
A. 50
B. 100
C. 150
D. 250 - Maximum heat transfer in high temperature furnaces is by____________________?
A. Conduction
B. Convection
C. Radiation
D. Either A., B. or C.; depends on the type of furnace - Protective gas used in the annealing furnace for steel coil comprises of__________________?
A. 95% N2 + 5% H2
B. 5% H2 + 9% N2
C. 100% CO
D. 100% H2 - Unit of furnace loading is____________________?
A. Ton stock/hr/m2 hearth area
B. Ton stock/hr
C. Ton stock/m2 hearth area
D. Both B. and C. - Which of the following accentuates clinkering troubles on furnace grate burning coal ?
A. Low reactivity of carbonised residue containing high proportion of iron & sulphur
B. Low forced draft & fuel bed temperature
C. Thick firebed and preheated primary air
D. All A., B. and C. - In reverberatory furnace, charge is heated mainly by__________________?
A. Conduction
B. Natural convection
C. Radiation of heat from the roof of the combustion chamber
D. None of these
