Reverberatory furnace is used for
A. Roasting/reduction of ores
B. Annealing steel coil
C. Heating air
D. Steel melting
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Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?
A. Ash disposal problem
B. Excessive fly ash discharge from the stack
C. Higher power consumption in its transportation
D. Erosion of induced draft fan blades
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Circulation of gases in furnace is caused by the
A. Change in volume during a change of temperature
B. Difference in density between hot and cold gases
C. Furnace pressure in conjunction with draft in flues
D. All of the above
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Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
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Rate of heat release in a furnace, which is the measure of heat intensity is defined as
A. kcal/hr/m3 combustion space
B. kcal/m3 combustion space
C. kcal/hr
D. None of these
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Advantages of use of preheated combustion air are
A. Saving in fuel consumption
B. Reduction in scale losses
C. Increase in flame temperature
D. All of the above
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In salt bath furnace, heat is transferred to the charge mainly by
A. Conduction
B. Convection
C. Radiation
D. None of these
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Which of the following is a batch furnace?
A. Cupola
B. Reheating furnace
C. Glass tank furnace
D. None of these
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Which of the following is a rotary furnace?
A. Lime kiln
B. Soaking pit
C. Stoves
D. Annealing furnace
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Large tonnage of refractory bricks are dried in a
A. Shaft furnace
B. Rotary hearth furnace
C. Tunnel kiln
D. Muffle furnace
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Fuel used in B.F. stove is
A. Pulverised coal
B. Furnace oil
C. Blast furnace gas/mixed gas
D. Coke oven gas
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Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the
A. Quantity & temperature of waste gas
B. Dust concentration & nature of dust in waste gas
C. Corrosive nature of the waste gas
D. All of the above
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The rate of scaling of furnace stock depends upon the
A. Temperature
B. Time
C. Nature of atmosphere
D. All of the above
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Which of the following is the most suitable for preheating combustion air above 650°C ?
A. Regenerator
B. Metallic recuperator
C. Ceramic recuperator
D. None of these
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Which of the following is a natural draft furnace?
A. Blast furnace stoves
B. Power plant boilers
C. Sintering furnace
D. None of these
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Which furnace employs preheating, heating and soaking zones?
A. Soaking pit
B. Reheating furnace
C. Open hearth furnace
D. Cupola
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Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of
A. Low emissivity
B. High thermal conductivity
C. Both A and B
D. Neither A nor B
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Which is not accomplished in an underfired furnace?
A. Increase in heating capacity/m2 of floor space
B. Elimination of cold spot at the bottom of the charge
C. Reduction in the temperature of furnace gases
D. Portection of the periphery of the charge from excessive radiation
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Which is a continuous furnace?
A. Coke ovens
B. Annealing furnace
C. Glass tank furnace
D. None of these
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Which is not a hearth furnace?
A. Glass tank furnace
B. Open hearth furnace
C. Cupola
D. Reheating furnace
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