1. Which of the following properties are affected due to addition of carbon and manganese to steel?
(i) tensile strength and yield property
(ii) Ductility
(iii) Welding
(iv) Corrosion resistance
a) i and ii only
b) i and iii only
c) i, ii, iii
d) i and iv only
Discussion
Explanation: Increased quantity of carbon and manganese imparts higher tensile strength and yield properties but lowers ductility which is more difficult to weld.
2. Chrome and Nickel are added to Steel to improve _________
a) corrosion resistance and high temperature resistance
b) strength
c) ductility
d) weldablity
Discussion
Explanation: Steel is weak in fire and corrosion resistance. So, to improve corrosion resistance and high temperature resistance, chromium and nickel are added to steel.
3. Which of the following is the property of high carbon steel?
a) high toughness
b) reduced ductility
c) high strength
d) reduced strength
Discussion
Explanation: High carbon steel contains high carbon content. Hence it has reduced ductility, toughness and weldability.
4. High carbon steel is used in ______________
a) transmission lines and microwave towers
b) structural buildings
c) fire resistant buildings
d) for waterproofing
Discussion
Explanation: High carbon steel is used in transmission lines and microwave towers where relatively light members are joint by bolting.
5. What is the permissible percentage of micro-alloys in medium and high strength micro-alloyed steel?
a) 0.1%
b) 0.5%
c) 0.25%
d) 1.0%
Discussion
Explanation: Medium and High strength micro-alloyed steel have low carbon content, but alloys such as niobium, vanadium, titanium or boron are added to achieve high strength.
6. Fire resistant steels are also called as ____________
a) Stainless steel
b) Weathering steel
c) High strength steel
d) Thermomechanically treated steel
Discussion
Explanation: Fire resistant steels are also called as thermomechanically treated steel. They perform better than ordinary steel under fire.
7. What is the minimum percentage of chromium and nickel added to stainless steel?
a) 0.5%, 10.5%
b) 2%, 20%
c) 10.5%, 0.5%
d) 30%, 50%
Discussion
Explanation: Stainless steel are low carbon steels to which a minimum of 10.5% chromium (maximum 20%) and 0.5% nickel is added.
8. What is weathering steel?
a) low-alloy atmospheric corrosion-resistant steel
b) low-carbon steel
c) high strength quenched and tempered steel
d) fire resistant steel
Discussion
Explanation: Weathering steel are low-alloy atmospheric corrosion-resistant steel. They are often left unpainted. They have an ultimate tensile strength of 480 MPa.
9. Which of the following is correct criteria to be considered while designing?
a) Structure should be aesthetically pleasing but structurally unsafe
b) Structure should be cheap in cost even though it may be structurally unsafe
c) Structure should be structurally safe but less durable
d) Structure should be adequately safe, should have adequate serviceability
Discussion
Explanation: Structure should be designed such that it fulfils it intended purpose during its lifetime and be adequately safe in terms of strength, stability and structural integrity and have adequate serviceability. Structure should also be economically viable, aesthetically pleasing and environment friendly.
10. Analysis is referred to _____________
a) determination of cost of structure
b) determination of axial forces, bending moment, shear force etc.
c) determination of factor of safety
d) drafting architectural plans and drawings
Discussion
Explanation: Analysis refers to determination of axial forces, bending moment, shear force, torsional moments etc. acting on different members of structure due to applied loads and their combinations.