This set of Civil Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Steel and Iron Work – 1”.
1. There are many types of heat treating processes available to steel. The most common are ____________ quenching, and tempering.
Explanation: Annealing is the process of heating the steel to a sufficiently high temperature to relieve local internal stresses. It does not create a general softening of the product but only locally relieves strains and stresses locked up within the material. Annealing goes through three phases: recovery, recrystallization, and grain growth. The temperature required to anneal a particular steel depends on the type of annealing to be achieved and the alloying constituents.
2. ____________ is any weapon, artwork, utensil or architectural feature made of iron especially used for decoration.
b) Design work
c) Mason work
d) Makeup work
Explanation: There are two main types of ironwork: wrought iron and cast iron. While the use of iron dates as far back as 4000BC, it was the Hittites who first knew how to extract it and develop weapons. Use of iron was mainly utilitarian until the Middle Ages, it became widely used for decoration in the period between the 16th and 19th century.
3. Wrought ironwork is forged by a blacksmith using an __________
Explanation: Anvils are as massive as they are practical, because the higher their inertia, the more efficiently they cause the energy of striking tools to be transferred to the work piece. On a quality anvil, the smith’s hammer should rebound with almost as much energy as the smith puts into the downward stroke, ultimately making the smith’s job easier and less physically strenuous.
Explanation: The primary work surface of the anvil is known as the face. It is generally made of hardened steel and should be flat and smooth with rounded edges for most work. Any marks on the face will be transferred to the work. Also, sharp edges tend to cut into the metal being worked and may cause cracks to form in the workpiece. The face is hardened and tempered to resist the blows of the smith’s hammer, so the anvil face does not deform under repeated use. A hard anvil face also reduces the amount of force lost in each hammer blow. Hammers, tools, and work pieces of hardened steel should never directly strike the anvil face with full force, as they may damage it; this can result in chipping or deforming of the anvil face.
5. To inhibit corrosion, at least 11% chromium is added to steel so that a hard oxide forms on the metal surface; this is known as _________________
a) ironless steel
b) cast iron
c) hard iron
d) stainless steel
Explanation: Stainless steels are notable for their corrosion resistance, which increases with increasing chromium content. Molybdenum additions increase corrosion resistance in reducing acids and against pitting attack in chloride solutions. Thus, there are numerous grades of stainless steel with varying chromium and molybdenum contents to suit the environment the alloy must endure.
Explanation: Iron (III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3. It is one of the three main oxides of iron, the other two being iron (II) oxide (FeO), which is rare, and iron (II, III) oxide (Fe3O4), which also occurs naturally as the mineral magnetite. As the mineral known as hematite, Fe2O3 is the main source of iron for the steel industry.
7. The carbon in typical steel alloys may contribute up to ___________ of its weight.
Explanation: Varying the amount of carbon and many other alloying elements, as well as controlling their chemical and physical makeup in the final steel (either as solute elements, or as precipitated phases), slows the movement of those dislocations that make pure iron ductile, and thus controls and enhances its qualities.
8. Plain carbon-iron alloys with a higher than 2.1% carbon content are known as _____________
a) coke iron
b) wrought iron
c) cast iron
d) pig iron
Explanation: With modern steelmaking techniques such as powder metal forming, it is possible to make very high-carbon (and other alloy material) steels, but such are not common. Cast iron is not malleable even when hot, but it can be formed by casting as it has a lower melting point than steel and good cast ability properties. Certain compositions of cast iron, while retaining the economies of melting and casting, can be heat treated after casting to make malleable iron or ductile iron objects.
9. What is the raw material which is not needed for steel production?
b) Ferro alloys
Explanation: Steel is made when iron is combined with carbon and other elements like-
• Flux (Limestone and Dolomite)
• Silica or Sand
• Ferro alloys.
10. Which is not a type of steel?
a) Low-speed Steel
b) Carbide Steel
c) Cobalt Steel
d) Stainless Steel
Explanation: Types of steel are-
• Stainless Steel
• Carbide Steel
• Carbon Steel
• High-speed Steel
• Cobalt Steel.
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