In salt bath furnace, heat is transferred to the charge mainly by
In salt bath furnace, heat is transferred to the charge mainly by
In order to maintain an oxidising atmosphere in a furnace, it should have
In order to maintain an oxidising atmosphere in a furnace, it should have
In order to maintain a reducing atmosphere in a furnace, it should have
In order to maintain a reducing atmosphere in a furnace, it should have
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
Which of the following is a periodic furnace?
Which of the following is a periodic furnace?
Pulverised fuel fired furnaces employ __________ fuel firing.
Pulverised fuel fired furnaces employ __________ fuel firing.
Means for giving direction to the circulation of gases in furnaces are
Means for giving direction to the circulation of gases in furnaces are
Reducing atmosphere is maintained in a
Reducing atmosphere is maintained in a
Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
Overfire burning in a furnace is a phenomenon characterised by
Overfire burning in a furnace is a phenomenon characterised by
Main gas valve in a gaseous fuel burner is a __________ valve.
Main gas valve in a gaseous fuel burner is a __________ valve.
The rate of scaling of furnace stock depends upon the
The rate of scaling of furnace stock depends upon the
The advantages of firing pulverised coal in the furnace lies in the fact that, it
The advantages of firing pulverised coal in the furnace lies in the fact that, it
Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.
If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.
Decarburisation of steel
Decarburisation of steel
Neutral atmosphere is maintained in a/an __________ furnace.
Neutral atmosphere is maintained in a/an __________ furnace.
In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?
Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?
Fuel economy in an industrial furnace operation can not be achieved by the use of
Fuel economy in an industrial furnace operation can not be achieved by the use of
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
Which is a continuous furnace?
Which is a continuous furnace?
Reverberatory furnace is used for
Reverberatory furnace is used for
Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.
Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.
Fuel used in B.F. stove is
Fuel used in B.F. stove is
The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
Operation of blast furnace stove is based on the principles of a __________ furnace.
Operation of blast furnace stove is based on the principles of a __________ furnace.
The resistance furnace produces heat by the
The resistance furnace produces heat by the
Fuel economy in furnaces can be achieved by
Fuel economy in furnaces can be achieved by
Size of the combustion chamber of a furnace depends upon the
Size of the combustion chamber of a furnace depends upon the
In a muffle furnace, the muffle
In a muffle furnace, the muffle
Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by
Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by
Which of the following is not a directly fired furnace?
Which of the following is not a directly fired furnace?
If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.
If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.
Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
Circulation of gases in furnace is caused by the
Circulation of gases in furnace is caused by the
Blast furnace stoves are meant for heating
Blast furnace stoves are meant for heating
Which of the following is the most suitable for preheating combustion air above 650°C ?
Which of the following is the most suitable for preheating combustion air above 650°C ?
Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the
Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the
An example of a periodic furnace is the
An example of a periodic furnace is the
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
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
Advantages of use of preheated combustion air are
Advantages of use of preheated combustion air are
Thermal efficiency of furnaces can be improved by
Thermal efficiency of furnaces can be improved by
Which one shows the diagramatic heat balance in a furnace?
Which one shows the diagramatic heat balance in a furnace?
Which is not accomplished in an underfired furnace?
Which is not accomplished in an underfired furnace?
Combustion of fuel in a furnace with oxygen enriched air results in higher
Combustion of fuel in a furnace with oxygen enriched air results in higher
Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
__________ atmosphere is maintained inside an iron blast furnace.
__________ atmosphere is maintained inside an iron blast furnace.
Presence of SO₂ in furnace gases attacks the ferrous metal by way of
Presence of SO₂ in furnace gases attacks the ferrous metal by way of
The main function of a muffle in the muffle furnace is to
The main function of a muffle in the muffle furnace is to
Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?
Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?
The amount of combustible escaping uncon-sumed from the furnace, depends upon the
The amount of combustible escaping uncon-sumed from the furnace, depends upon the
Which of the following is a natural draft furnace?
Which of the following is a natural draft furnace?
Calcination of limestone to produce lime is done in a __________ kiln.
Calcination of limestone to produce lime is done in a __________ kiln.
The function of an economiser in a boiler is to preheat the
The function of an economiser in a boiler is to preheat the
Oxygen enrichment of combustion air does not result in increase of the
Oxygen enrichment of combustion air does not result in increase of the
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
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
Pot furnace which is either regenerative or recupterative, is used in the manufacture of
Pot furnace which is either regenerative or recupterative, is used in the manufacture of
Example of an indirectly heated furnace is
Example of an indirectly heated furnace is
The heating capacity of continuous reheating furnace depends upon the
The heating capacity of continuous reheating furnace depends upon the
Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by
Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by
In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of
In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of
Low stack loss indicates the
Low stack loss indicates the
Power required in case of forced draught as compared to induced draught (for the same draught produced) is
Power required in case of forced draught as compared to induced draught (for the same draught produced) is
Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the
Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the
Which furnace employs preheating, heating and soaking zones?
Which furnace employs preheating, heating and soaking zones?
Ingress of cold air in the furnaces through cracks, charging doors, openings etc.
Ingress of cold air in the furnaces through cracks, charging doors, openings etc.
Which is the most thermally efficient furnace?
Which is the most thermally efficient furnace?
__________ is an indirectly heated furnace.
__________ is an indirectly heated furnace.
Forced recirculation of furnace gases is practised
Forced recirculation of furnace gases is practised
Air filtration in a furnace
Air filtration in a furnace
Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of
Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of
Rate of heat release in a furnace, which is the measure of heat intensity is defined as
Rate of heat release in a furnace, which is the measure of heat intensity is defined as
Scaling of furnace stock is reduced by __________ in flue gas.
Scaling of furnace stock is reduced by __________ in flue gas.
Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.
Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.
Maximum heat transfer in high temperature furnaces is by
Maximum heat transfer in high temperature furnaces is by
Which of the following variables affects the furnace capacity?
Which of the following variables affects the furnace capacity?
Tunnel kilns are usually used for
Tunnel kilns are usually used for
Which of the following is a heat treatment furnace?
Which of the following is a heat treatment furnace?
Which of the following is a batch furnace?
Which of the following is a batch furnace?
Which of the following variables does not affect the furnace capacity?
Which of the following variables does not affect the furnace capacity?
Cement Kiln is a
Cement Kiln is a
Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?
Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?
Which is not a hearth furnace?
Which is not a hearth furnace?
The heating capacity of muffle furnace depends on the
The heating capacity of muffle furnace depends on the
Hearth furnaces are not used for
Hearth furnaces are not used for
Which of the following is a rotary furnace?
Which of the following is a rotary furnace?
Which of the following furnaces will have maximum thermal efficiency?
Which of the following furnaces will have maximum thermal efficiency?
Which is a regenerative furnace?
Which is a regenerative furnace?
In reverberatory furnace, charge is heated mainly by
In reverberatory furnace, charge is heated mainly by
The method of Lobo and Evans is concerned with the calculation of the
The method of Lobo and Evans is concerned with the calculation of the
Protective gas used in the annealing furnace for steel coil comprises of
Protective gas used in the annealing furnace for steel coil comprises of
__________ furnace is not an electric furnace.
__________ furnace is not an electric furnace.
An example of indirectly heated furnace is the
An example of indirectly heated furnace is the
Dampers are located
Dampers are located
Large tonnage of refractory bricks are dried in a
Large tonnage of refractory bricks are dried in a
The reason for excessive clinker formation in gas producers is the
The reason for excessive clinker formation in gas producers is the
Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of
Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of
An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace.
An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace.
