A. Electric arc struck between electrodes and the charge
B. Flow of current through a heating element
C. Combination of induced current and skin effect
D. None of these
A. Low emissivity
B. High thermal conductivity
C. Both A. and B.
D. Neither A. nor B.
A. Soaking pit
B. Muffle furnace
C. Reheating furnace
D. None of these
A. Cold rolled steel coil annealing
B. Open hearth
C. Soaking pit
D. Walking beam reheating
A. 15
B. 40
C. 70
D. 85
A. Combination of induced current and skin effect
B. Induction and resistance
C. Current flow through a heating element
D. None of these
A. Temperature
B. Time
C. Nature of atmosphere
D. All A., B. and 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. Conduction
B. Convection
C. Radiation
D. Cannot be predicted
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.