Ostwald charts are meant for__________?
Which of the following furnaces will have maximum thermal efficiency ?
The function of an economiser in a boiler is to preheat the __________?
Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ?
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 ?

Pick out the wrong statement ?

A. Addition of methane to the furnace atmosphere reduces decarburising by hydrogen
B. Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases
carburise the surface of steel at annealing temperatures
C. Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation
with increase in surface hardness
D. None of these

Correct Answer: None of these ✔

Last Updated: March 11, 2019