Q. Thermal efficiency of an open hearth furnace may be about __________ percent.

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Q. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.

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Q. Which of the following is a rotary furnace?

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Q. While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C.

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Q. Advantages of use of preheated combustion air are

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Q. Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the

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Q. The heating capacity of continuous reheating furnace depends upon the

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Q. Pick out the wrong statement.

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Q. Which one is not an induced draught furnace?

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Q. Overfire burning in a furnace is a phenomenon characterised by

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Q. If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.

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Q. Neutral atmosphere is maintained in a/an __________ furnace.

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Q. The resistance furnace produces heat by the

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Q. Which of the following variables does not affect the furnace capacity ?

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Q. Unit of furnace loading is

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Q. In a furnace operation, which is not preheated ?

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Q. Operation of blast furnace stove is based on the principles of a __________ furnace.

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Q. In salt bath furnace, heat is transferred to the charge mainly by

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Q. In order to maintain an oxidising atmosphere in a furnace, it should have

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Q. Combustion of fuel in a furnace with oxygen enriched air results in higher

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