A. Oxidising
B. Reducing
C. Inert
D. Decarburising
Related Mcqs:
- Thermal efficiency of blast furnace stoves used for heating blast (air) may be about _____________ percent?
A. 20
B. 40
C. 60
D. 80 - Neutral atmosphere is maintained in a/an ____________ furnace?
A. Cold rolled steel coil annealing
B. Open hearth
C. Soaking pit
D. Walking beam reheating - 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 - Furnace aerodynamics is related to the _____________ in the furnace?
A. Movement of gases
B. Measurement of flue gas volume
C. Temperature control
D. Pressure adjustment - The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?
A. Arc
B. Resistance
C. Low frequency induction
D. High frequency induction - While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about _____________ °C?
A. 2000
B. 3000
C. 4500
D. 6000 - _____________ furnace is not an electric furnace?
A. Arc
B. Induction
C. Pot
D. Resistance - Reducing atmosphere is maintained in a__________________?
A. Calcination kiln
B. Blast furnace
C. Soaking pit
D. L.D. converter - Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent?
A. 10-15
B. 25-30
C. 45-50
D. 65-70 - In order to maintain an oxidising atmosphere in a furnace, it should have__________________?
A. More of excess air
B. Less of excess air
C. More of CO in flue gas
D. More of CO2 in flue gas
