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Furnace Technology
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Q.1
Reducing atmosphere is maintained in a
Calcination kiln
Blast furnace
Soaking pit
L.D. converter
Q.2
The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent.
15
40
70
85
Q.3
Circulation of gases in furnace is caused by the
Change in volume during a change of temperature
Difference in density between hot and cold gases
Furnace pressure in conjunction with draft in flues
All of the above
Q.4
In a furnace operation, which is not preheated?
Solid fuels
Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)
Both A and B
Neither A nor B
Q.5
Soaking pits are meant for heating steel
Ingots
Coils
Sheets
Slabs
Q.6
Turn down ratio of a burner
Should be as low as possible i.e., 1 : 2
Should be 1:1 for a batch type furnace.
Is the ratio of maximum to minimum permissible heat input rates
Is normally much more for a continuous furnace as compared to a batch furnace
Q.7
Advantages of use of preheated combustion air are
Saving in fuel consumption
Reduction in scale losses
Increase in flame temperature
All of the above
Q.8
In salt bath furnace, heat is transferred to the charge mainly by
Conduction
Convection
Radiation
None of these
Q.9
Reverberatory furnace is used for
Roasting/reduction of ores
Annealing steel coil
Heating air
Steel melting
Q.10
Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?
Ash disposal problem
Excessive fly ash discharge from the stack
Higher power consumption in its transportation
Erosion of induced draft fan blades
Q.11
Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an
Blast furnace
Steam boiler
Salt bath furnace
Annealing furnace
Q.12
Unit of furnace loading is
Ton stock/hr/m² hearth area
Ton stock/hr
Ton stock/m² hearth area
Both B and C
Q.13
Which of the following is a batch furnace?
Cupola
Reheating furnace
Glass tank furnace
None of these
Q.14
Which of the following is a rotary furnace?
Lime kiln
Soaking pit
Stoves
Annealing furnace
Q.15
Thermal efficiency of an open hearth furnace may be about __________ percent.
5
20
50
80
Q.16
Furnace pressure is normally controlled by regulating the
Air pressure
Fuel gas pressure
Speed of I.D. fan
Damper
Q.17
An example of shaft furnace is the
L.D. converter
Glass melting tank
Blast furnace
Soaking pit
Q.18
__________ is an indirectly heated furnace.
Open hearth furnace
Muffle furnace
Soaking pit
Reheating furnace
Q.19
Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
350
750
1050
1250
Q.20
Rate of heat release in a furnace, which is the measure of heat intensity is defined as
Kcal/hr/m³ combustion space
Kcal/m³ combustion space
Kcal/hr
None of these
Q.21
Large tonnage of refractory bricks are dried in a
Shaft furnace
Rotary hearth furnace
Tunnel kiln
Muffle furnace
Q.22
Which of the following is a directly fired intermittant furnace?
Walking beam reheating furnace
Reverberatory furnace
Tower furnace
Tunnel kiln
Q.23
To reduce the stack loss, heat recovery from flue gas can be done by
Preheating of cold stock
Preheating of combustion air
Steam generation in waste heat boilers
All of the above
Q.24
Specific heating capacity of a furnace is expressed as
Weight heated/hr
Weight heated/furnace volume
Weight heated/hr/furnace volume
None of these
Q.25
Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
20
40
60
80
Q.26
Maximum thermal efficiency of boiler may be about __________ percent.
10
25
65
90
Q.27
Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.
80
130
180
250
Q.28
Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.
10-15
25-30
45-50
65-70
Q.29
Which furnace employs natural draft?
Coke oven
Boiler
Rotary kilns
L.D. converter
Q.30
Heat balance of furnace provides means of determining the
Thermal efficiency of the process
Sources of heat losses
Scope of reduction of heat losses
All of the above
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