A. Ammonia
B. Fine dolomite
C. Alkaline powders
D. None of these
Correct Answer: None of these ✔
Last Updated: March 11, 2019
Related MCQs
- 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__________?
- Fuel economy in an industrial furnace operation cannot be achieved by the use of__________?
- Which furnace employs preheating, heating and soaking zones ?
- Regenerators are normally provided in the__________?
- Overfire burning in a furnace is a phenomenon characterised by__________?
- Which is a continuous furnace ?
- Turndown ratio of a burner gives an idea of the __________ in the furnace?
- A refractory wall separating the stock and the source of heat is provided in a__________?
- Large tonnage of refractory bricks are dried in a__________?
- Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?
- If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace?
- __________ atmosphere is maintained inside an iron blast furnace?
- Which one shows the diagrammatic heat balance in a furnace ?
- In reverberatory furnace, charge is heated mainly by__________?
- Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures?
- In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of__________?
- Which of the following is a heat treatment furnace ?
- An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace?
- Size of the combustion chamber of a furnace depends upon the __________?
- To reduce the stack loss, heat recovery from flue gas can be done by__________?
- __________ furnace is not an electric furnace?
- The advantages of firing pulverised coal in the furnace lies in the fact that, it__________?
- Which is the most thermally efficient furnace __________?
- Ingress of cold air in the furnaces through cracks, charging doors, openings etc __________?
- Fuel economy in furnaces can be achieved by__________?
- __________ is an indirectly heated furnace?
- Furnace pressure is normally controlled by regulating the__________?
- Which one is not an induced draught furnace ?
- Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of__________?
- Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an__________?
- Reducing atmosphere is maintained in a__________?
- The amount of combustible escaping unconsumed from the furnace, depends upon the__________?
- Heat transfer rate to the charge/stock in a furnace does not depend upon the__________?
- Higher furnace temperature cannot be achieved by use of a lean fuel gas in the furnace by__________?
- Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent?
- An example of recuperative furnace is the__________?
- In a furnace employing forced draught as compared to induced draught__________?
- Which is a regenerative furnace ?
- In order to maintain an oxidising atmosphere in a furnace, it should have__________?
- Heat transfer rate to the stock/charge in the furnace does not depend upon the__________?
- The main function of a muffle in the muffle furnace is to__________?
- In a furnace operation, which is not preheated ?
- Fuel used in B.F. stove is__________?
- Reverberatory furnace is used for__________?
- Which furnace employs an I.D. fan for the removal of flue gases from the furnace ?
- Cement Kiln is a__________?
- Which of the following accentuates clinkering troubles on furnace grate burning coal ?
- Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent?
- Means for giving direction to the circulation of gases in furnaces are__________?
- Heat balance of furnace provides means of determining the__________?
- If fuel and air are mixed ahead of the burner, it is called a/an __________ burner?