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Furnace Technology
Quiz 3
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Q.1
Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
< 2
< 5
< 8
< 10
Q.2
Decarburisation of steel
Is the removal of carbon from iron carbide (Fe₃C)
Affects its crystalline structure
Is favoured by CO₂
All of the above
Q.3
Air filtration in a furnace
Reduces its thermal efficiency
Is indicated by flame sting out
Increases the flue gas temperature
None of these
Q.4
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
Transportation of coal
Drying of coal
Combustion of coal by supplying it around the burner
Preheating the primary air
Q.5
Power required in case of forced draught as compared to induced draught (for the same draught produced) is
Same
Less
More
Either more or less; depends on the flue gas density
Q.6
Which is the most thermally efficient furnace?
Reheating furnace
Reverberatory furnace
Rotary kilns
Boiler furnace
Q.7
Hearth furnaces are not used for
Roasting
Melting
Reheating
None of these
Q.8
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
50
65
85
99
Q.9
Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by
Preheating the combustion air
Oxygen enrichment of combustion air
Preheating the fuel gas
All of the above
Q.10
Which of the following is a heat treatment furnace?
Muffle furnace
Annealing furnace
Reheating furnace
Rotary kiln
Q.11
The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
Arc
Resistance
Low frequency induction
High frequency induction
Q.12
Main gas valve in a gaseous fuel burner is a __________ valve.
Gate
Butterfly
Globe
None of these
Q.13
Ingress of cold air in the furnaces through cracks, charging doors, openings etc.
Reduces the flue gas temperature and makes the furnace atmosphere oxidising
Increases the load on the induced draft fan
Reduces the furnace draught
All of the above
Q.14
If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.
Sidefired
Underfired
Covered
Recirculating
Q.15
In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
Ostwald chart
Cox chart
Sankey diagram
None of these
Q.16
The heating capacity of continuous reheating furnace depends upon the
Hearth area and furnace temperature
Emissivity of the stock
Ratio of wall surface to stock surface
All of the above
Q.17
Means for giving direction to the circulation of gases in furnaces are
Fans
Arrangement of heating stock in the furnaces
Location of outlet ports and heating & combustion devices
All of the above
Q.18
The heating capacity of muffle furnace depends on the
Surface area & emissivity of the stock
Properties of the muffle wall (temperature, area, emissivity)
Both A & B
Neither A nor B
Q.19
Fuel economy in an industrial furnace operation can not be achieved by the use of
Stoichiometric combustion air
Non-preheated combustion air
Combustion air not enriched with oxygen
Recupterators
Q.20
Oxygen enrichment of combustion air does not result in increase of the
Flame temperature
Oxygen in the flue gas
Stack loss
Heat transfer rate in the furnace
Q.21
Overfire burning in a furnace is a phenomenon characterised by
Supply of excess fuel
Supply of excess air
Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air
None of these
Q.22
Which of the following variables does not affect the furnace capacity?
Size of the furnace
Gas velocity in furnace
Ratio of wall surface to surface of stock
None of these
Q.23
Reheating furnace (pusher type) is used for heating
Ingots
Slabs
Steel coils
Steel sheets
Q.24
Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.
250
650
850
1000
Q.25
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
Resistance
Arc
Low frequency induction
None of these
Q.26
Calcination of limestone to produce lime is done in a __________ kiln.
Tunnel
Rotary
Vertical shaft
Both B and C
Q.27
Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
Coke oven
Blast furnace stoves
Beehive coke oven
High pressure boiler
Q.28
The function of an economiser in a boiler is to preheat the
Feedwater
Combustion air
Pulverised coal
Furnace oil
Q.29
__________ atmosphere is maintained inside an iron blast furnace.
Oxidising
Reducing
Inert
Decarburising
Q.30
Size of the combustion chamber of a furnace depends upon the
Heat release rate of the fuel
Preheat temperature of fuel & air
Method of mixing the fuel & air
All of the above
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