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Furnace Technology
Quiz 2
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Q.1
Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an
Economiser
Steam superheater
Air preheater
All of the above
Q.2
In producer gas making furnace, steam is added along with air to mainly control the
Fusion of coal ash & clinker formation
C. V. of producer gas
Temperature of producer gas
Tar content in producer gas
Q.3
Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by
Increasing the draft in the furnace
Preheating the fuel gas
Oxygen enrichment of combustion air
Preheating the combustion air
Q.4
Neutral atmosphere is maintained in a/an __________ furnace.
Cold rolled steel coil annealing
Open hearth
Soaking pit
Walking beam reheating
Q.5
In order to maintain an oxidising atmosphere in a furnace, it should have
More of excess air
Less of excess air
More of CO in flue gas
More of CO₂ in flue gas
Q.6
Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of
Graphite powder
Thoria
Zircon powder
Beryllium
Q.7
An example of indirectly heated furnace is the
Soaking pit
Muffle furnace
Reheating furnace
None of these
Q.8
The resistance furnace produces heat by the
Electric arc struck between electrodes and the charge
Flow of current through a heating element
Combination of induced current and skin effect
None of these
Q.9
The method of Lobo and Evans is concerned with the calculation of the
Heat absorption in radiant section of a furnace
Heat transfer by forced convection in a reboiler
Heat transfer in vacuum condensers
Mass transfer co-efficient
Q.10
Pulverised fuel fired furnaces employ __________ fuel firing.
Horizontal
Vertical
Tangential
All of the above
Q.11
Combustion of fuel in a furnace with oxygen enriched air results in higher
Flue gas volume
Flame temperature
Fuel consumption
Stack loss
Q.12
Scaling of furnace stock is reduced by __________ in flue gas.
CO
H₂
High CO/CO₂
All of the above
Q.13
Cement Kiln is a
Rotary Kiln
Tunnel Kiln
Natural draft furnace
Batch furnace
Q.14
If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.
Premix
Outside mixing type
Rotary
Diffusion
Q.15
Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of
Furnace oil with air
Furnace oil with oxygen
Blast furnace gas with air
Blast furnace gas with oxygen
Q.16
Which of the following furnaces will have maximum thermal efficiency?
Soaking pits
Walking beam reheating furnace
Boiler furnace
Rotary kilns
Q.17
An example of a periodic furnace is the
Blast furnace stoves
Blast furnace
Coke oven heating chamber
Rotary kilns
Q.18
Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?
Economiser
Regenerator
Ceramic recuperator
Waste heat boiler
Q.19
Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.
50
100
150
250
Q.20
Which is a regenerative furnace?
Coke oven heating chamber
Open hearth furnace
Both A and B
Neither A nor B
Q.21
Dampers are located
Before the I.D fan
After the I.D. fan
Near the top of the chimney
Anywhere after the I.D. fan
Q.22
Protective gas used in the annealing furnace for steel coil comprises of
95% N₂ + 5% H₂
5% H₂ + 9% N₂
100% CO
100 %H₂
Q.23
__________ furnace is not an electric furnace.
Arc
Induction
Pot
Resistance
Q.24
In reverberatory furnace, charge is heated mainly by
Conduction
Natural convection
Radiation of heat from the roof of the combustion chamber
None of these
Q.25
Blast furnace stoves are meant for heating
Air
Blast furnace gas
Steam
None of these
Q.26
In order to maintain a reducing atmosphere in a furnace, it should have
No O₂ in flue gas
CO in flue gas
High excess air
None of these
Q.27
An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace.
Walking beam
Shaft
Tunnel
Rotary hearth
Q.28
Which of the following variables affects the furnace capacity?
Temperature of flue gas
Thermal conductivity of stock
Thickness of heating stock
All of the above
Q.29
Forced recirculation of furnace gases is practised
To increase heat transfer by convection
To ensure uniform temperature
In furnaces, operating below 750°C
All of the above
Q.30
The amount of combustible escaping uncon-sumed from the furnace, depends upon the
Air supplied and furnace temperature
Burner design (thoroughness of mixing versus stratification)
Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
All of the above
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