Q.1
Which of the following is not a directly fired furnace?
Q.2
In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
Q.3
The reason for excessive clinker formation in gas producers is the
Q.4
Coke ovens in steel plant are heated by
Q.5
Which of the following is not an additive for flue gases from furnace to reduce its dew-point?
Q.6
In low or standard frequency induction furnace, heat is produced by the
Q.7
Use of pulverised coal in boilers provides
Q.8
Recuperator is
Q.9
A refractory wall separating the stock and the source of heat is provided in a
Q.10
In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of
Q.11
Presence of SO₂ in furnace gases attacks the ferrous metal by way of
Q.12
Which one shows the diagramatic heat balance in a furnace?
Q.13
Maximum heat transfer in high temperature furnaces is by
Q.14
Fuel economy in furnaces can be achieved by
Q.15
Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
Q.16
Thermal efficiency of furnaces can be improved by
Q.17
Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the
Q.18
Which furnace employs preheating, heating and soaking zones?
Q.19
Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of
Q.20
In a muffle furnace, the muffle
Q.21
Example of an indirectly heated furnace is
Q.22
The main function of a muffle in the muffle furnace is to
Q.23
Which of the following is a periodic furnace?
Q.24
Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?
Q.25
Operation of blast furnace stove is based on the principles of a __________ furnace.
Q.26
Which is not accomplished in an underfired furnace?
Q.27
Which is a continuous furnace?
Q.28
Which is not a hearth furnace?
Q.29
Fuel used in B.F. stove is
Q.30
Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the
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