A. 250
B. 650
C. 850
D. 1000
0
Air filtration in a furnace___________________?
0
Which of the following is not a directly fired furnace ?
A. Reduces its thermal efficiency
B. Is indicated by flame sting out
C. Increases the flue gas temperature
D. None of these
0
Thermal efficiency of an open hearth furnace may be about _____________ percent?
A. By-product coke oven
B. Calcination kiln
C. Sintering furnace
D. Open hearth furnace
0
The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?
A. 5
B. 20
C. 50
D. 80
0
Which of the following is the most suitable for preheating combustion air above 650°C ?
A. Arc
B. Resistance
C. Low frequency induction
D. High frequency induction
0
Artificial draught produced by a fan in the furnace can be controlled by the___________________?
A. Regenerator
B. Metallic recuperator
C. Ceramic recuperator
D. None of these
0
Protective gas used in the annealing furnace for steel coil comprises of__________________?
A. Speed of the fan
B. Damper
C. Variation in the pitch of fan blades
D. All A., B. and C.
0
Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about ____________ °C?
A. 95% N2 + 5% H2
B. 5% H2 + 9% N2
C. 100% CO
D. 100% H2
0
Reheating furnace (pusher type) is used for heating_____________________?
A. 80
B. 130
C. 180
D. 250
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