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Furnace Technology
Quiz 5
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Q.1
Which of the following is not a directly fired furnace?
By-product coke oven
Calcination kiln
Sintering furnace
Open hearth furnace
Q.2
In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
Conduction
Convection
Radiation
Can not be predicted
Q.3
The reason for excessive clinker formation in gas producers is the
Use of coal/coke containing a high % of fines and ash
Use of fuel having too low an ash fusion temperature
Development of hot spots in the fuel bed and an abnormally high rate of gasification
All of the above
Q.4
Coke ovens in steel plant are heated by
Electricity
Blast furnace gas/mixed gas
Coke oven gas
Both B and C
Q.5
Which of the following is not an additive for flue gases from furnace to reduce its dew-point?
Ammonia
Fine dolomite
Alkaline powders
None of these
Q.6
In low or standard frequency induction furnace, heat is produced by the
Combination of induced current and skin effect
Induction and resistance
Current flow through a heating element
None of these
Q.7
Use of pulverised coal in boilers provides
Higher calorific value
Better combustion
Smokeless burning
Less erosion on furnace wall
Q.8
Recuperator is
Not used for fuel gas preheating
An intermittant waste heat recovery equipment
A continuous waste heat recovery equipment
Heavier than regenerator meant for the same duty
Q.9
A refractory wall separating the stock and the source of heat is provided in a
Updraft kiln
Muffle furnace
Continuous furnace
None of these
Q.10
In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of
Use of non-preheated combustion air
Use of pulverised solid fuels
Imperfect mixing of fuel & air and infiltration of air
Use of excessive positive draft in the furnace
Q.11
Presence of SO₂ in furnace gases attacks the ferrous metal by way of
Accelerating the rate of scaling
Causing metal embrittlement
Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature
All of the above
Q.12
Which one shows the diagramatic heat balance in a furnace?
Sankey diagram
Cox chart
Ostwald chart
None of these
Q.13
Maximum heat transfer in high temperature furnaces is by
Conduction
Convection
Radiation
Either A, B or C; depends on the type of furnace
Q.14
Fuel economy in furnaces can be achieved by
Using oxygen enriched combustion air
Preheating the combustion air
Reducing the heat loss through furnace openings & doors
All of the above
Q.15
Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
Furnace employing neutral atmosphere
Carbon resistance furnace
Reducing atmosphere
Furnace employing negative pressure
Q.16
Thermal efficiency of furnaces can be improved by
Waste heat recovery from flue gas
Minimising heat losses from furnace walls
Maintaining proper draught
All of the above
Q.17
Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the
Physical nature, ash content and fineness of the coal
Amount of excess air supplied and load on the boiler
Type of burner and combustion chamber
All of the above
Q.18
Which furnace employs preheating, heating and soaking zones?
Soaking pit
Reheating furnace
Open hearth furnace
Cupola
Q.19
Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of
Low emissivity
High thermal conductivity
Both A and B
Neither A nor B
Q.20
In a muffle furnace, the muffle
Retards the heat transfer
Assists in temperature equalisation in the charge
Permits the use of controlled atmosphere for the protection of stock
All of the above
Q.21
Example of an indirectly heated furnace is
Hood annealing furnace
Muffle furnace
Both A and B
Neither A nor B
Q.22
The main function of a muffle in the muffle furnace is to
Protect the charge from the effects of the products of combustion
Smooth out temperature inequalities on the combustion side of the muffle wall
Both A & B
Neither A nor B
Q.23
Which of the following is a periodic furnace?
Tunnel kiln
Rotary kiln
Soaking pit
Reheating furnace
Q.24
Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?
Increase in calorific value of the fuel
Increase in flame temperature
Reduction in scale losses
Saving in fuel consumption
Q.25
Operation of blast furnace stove is based on the principles of a __________ furnace.
Regenerative
Recuperative
Both A and B
Neither A nor B
Q.26
Which is not accomplished in an underfired furnace?
Increase in heating capacity/m² of floor space
Elimination of cold spot at the bottom of the charge
Reduction in the temperature of furnace gases
Portection of the periphery of the charge from excessive radiation
Q.27
Which is a continuous furnace?
Coke ovens
Annealing furnace
Glass tank furnace
None of these
Q.28
Which is not a hearth furnace?
Glass tank furnace
Open hearth furnace
Cupola
Reheating furnace
Q.29
Fuel used in B.F. stove is
Pulverised coal
Furnace oil
Blast furnace gas/mixed gas
Coke oven gas
Q.30
Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the
Quantity & temperature of waste gas
Dust concentration & nature of dust in waste gas
Corrosive nature of the waste gas
All of the above
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