Q.1
Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
Q.2
Decarburisation of steel
Q.3
Air filtration in a furnace
Q.4
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
Q.5
Power required in case of forced draught as compared to induced draught (for the same draught produced) is
Q.6
Which is the most thermally efficient furnace?
Q.7
Hearth furnaces are not used for
Q.8
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
Q.9
Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by
Q.10
Which of the following is a heat treatment furnace?
Q.11
The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
Q.12
Main gas valve in a gaseous fuel burner is a __________ valve.
Q.13
Ingress of cold air in the furnaces through cracks, charging doors, openings etc.
Q.14
If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.
Q.15
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
Q.16
The heating capacity of continuous reheating furnace depends upon the
Q.17
Means for giving direction to the circulation of gases in furnaces are
Q.18
The heating capacity of muffle furnace depends on the
Q.19
Fuel economy in an industrial furnace operation can not be achieved by the use of
Q.20
Oxygen enrichment of combustion air does not result in increase of the
Q.21
Overfire burning in a furnace is a phenomenon characterised by
Q.22
Which of the following variables does not affect the furnace capacity?
Q.23
Reheating furnace (pusher type) is used for heating
Q.24
Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.
Q.25
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
Q.26
Calcination of limestone to produce lime is done in a __________ kiln.
Q.27
Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
Q.28
The function of an economiser in a boiler is to preheat the
Q.29
__________ atmosphere is maintained inside an iron blast furnace.
Q.30
Size of the combustion chamber of a furnace depends upon the
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