This set of Iron Making Multiple Choice Questions & Answers (MCQs) focuses on “Ideal Blast Furnace”.
1. In the concept of ideal furnace the radial variations are ignored for better understanding.
a) True
b) False
View Answer
Explanation: The change in temperature and composition takes place along the radial direction and along the depth of the furnace. However, radial variation is ignored in ideal furnace concept, in order to better understand the interior state of the furnace.
2. The ideal blast furnace consists of mainly ___________
a) three zones
b) four zones
c) two zones
d) five zones
View Answer
Explanation: The ideal blast furnace consists of mainly three zones, namely preheating zone, TRZ (thermal reserve zone) and CRZ (chemical reserve zone), direct reduction and melting zone. Indirect reduction takes place in preheating zone and TRZ.
3. In the BF, the gas temperature is always higher than the ___________
a) solid temperature
b) semi solid temperature
c) vapour temperature
d) liquid temperature
View Answer
Explanation: In the ideal blast furnace, the gas temperature is always higher than the solid temperature. As a result heat flow takes place from gas to solid, as gas is at a higher temperature than solid.
4. What happen to the gas temperature in going vertically upwards from the bottom?
a) Gas temperature decreases rapidly
b) Gas temperature increases rapidly
c) Gas temperature increases slowly
d) Gas temperature decreases slowly
View Answer
Explanation: From the experimental observations it is observed that the gas temperature decreases rapidly in going vertically upwards from the bottom and it becomes constant at the TRZ (thermal reserve zone), then it begins to decrease.
5. The temperature of the solids remains constant at the ______________
a) TRZ(thermal reserve zone)
b) CRZ (chemical reserve zone)
c) Preheating zone
d) Melting zone
View Answer
Explanation: In ideal blast furnace, the temperature of the solids also remains constant at the TRZ (thermal reserve zone). The ideal blast furnace consists of mainly three zones, namely preheating zone, TRZ (thermal reserve zone) and CRZ (chemical reserve zone), direct reduction and melting zone.
Sanfoundry Global Education & Learning Series – Iron Making.
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