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Chemical Engineering Objective Questions { Furnace Technology }



92. 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 of the above
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93. In a muffle furnace, the muffle
A. Retards the heat transfer
B. Assists in temperature equalisation in the charge
C. Permits the use of controlled atmosphere for the protection of stock
D. All of the above
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94. Example of an indirectly heated furnace is
A. Hood annealing furnace
B. Muffle furnace
C. Both A and B
D. Neither A nor B
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95. The advantages of firing pulverised coal in the furnace lies in the fact that, it
A. Permits the use of high ash content coal
B. Permits the use of low fusion point ash coal
C. Accelerates the burning rate and economises on fuel consumption
D. All of the above
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96. Tunnel kilns are usually used for
A. Roasting of pyrites
B. Drying/tempering of refractories
C. Reheating of slabs
D. Melting of glass
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97. Which of the following is not a directly fired furnace?
A. By-product coke oven
B. Calcination kiln
C. Sintering furnace
D. Open hearth furnace
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98. Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
A. Furnace employing neutral atmosphere
B. Carbon resistance furnace
C. Reducing atmosphere
D. Furnace employing negative pressure
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