Design of Steel Structures Multiple Choice Questions on “Types of Steel”.
1. Which of the following is the property of high carbon steel?
a) high toughness
b) reduced ductility
c) high strength
d) reduced strength
Answer: b
Clarification: High carbon steel contains high carbon content. Hence it has reduced ductility, toughness and weldability.
2. High carbon steel is used in ______________
a) transmission lines and microwave towers
b) structural buildings
c) fire resistant buildings
d) for waterproofing
Answer: a
Clarification: High carbon steel is used in transmission lines and microwave towers where relatively light members are joint by bolting.
3. 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%
Answer: c
Clarification: 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.
4. Fire resistant steels are also called as ____________
a) Stainless steel
b) Weathering steel
c) High strength steel
d) Thermomechanically treated steel
Answer: d
Clarification: Fire resistant steels are also called as thermomechanically treated steel. They perform better than ordinary steel under fire.
5. 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%
Answer: c
Clarification: Stainless steel are low carbon steels to which a minimum of 10.5% chromium (maximum 20%) and 0.5% nickel is added.
6. Match the pair of Type of steel with its ultimate tensile strength :
TYPE OF STEEL ULTIMATE TENSILE CAPACITY (A) Carbon Steel (i) 700-950 MPa (B) High Strength Carbon Steel (ii) 440-590 MPa (C) Weathering Steel (iii) 410-440 MPa (D) High Strength quenched & tempered steel (iv) 480 MPa (E) Medium and High strength microalloyed steel (v) 480-550 MPa
a) A-i, B-ii, C-iii, D-iv, E-v
b) A-v, B-iv, C-iii, D-ii, E-i
c) A-iii, B-v, C-iv, D-i, E-ii
d) A-ii, B-iii, C-v, D-i, E-iv
Answer: c
Clarification: Ultimate tensile strength is the capacity of material to withstand loads tending to elongate. It is the maximum stress that a material can withstand while being stretched or pulled. The ultimate tensile strength for Carbon Steel is 410-440 MPa, 480-550 MPa for High Strength Carbon Steel, 480 MPa for Weathering Steel, 700-950 MPa for High Strength quenched & tempered steel, 440-590 MPa for Medium and High strength microalloyed steel.
7. 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
Answer: a
Clarification: Weathering steel are low-alloy atmospheric corrosion-resistant steel. They are often left unpainted. They have an ultimate tensile strength of 480 MPa.
8. Match the pair of Type of steel with its yield strength:
TYPE OF STEEL YIELD STRENGTH (A) Carbon Steel (i) 300-450 MPa (B) High Strength Carbon Steel (ii) 350 MPa (C) Weathering Steel (iii) 350-400 MPa (D) High Strength quenched & tempered steel (iv) 230-300MPa (E) Medium and High strength microalloyed steel (v) 550-700 MPa
a) A-i, B-ii, C-iii, D-iv, E-v
b) A-i, B-iii, C-v, D-iv, E-ii
c) A-v, B-iv, C-iii, D-ii, E-i
d) A-iv, B-iii, C-ii, D-v, E-i
Answer: d
Clarification: Yield Strength is the stress that a material can withstand without any permanent deformation i.e. the point of stress at which any material starts to deform plastically. The yield strength of carbon steel is 230-300MPa, 350-400 MPa for High Strength Carbon Steel, 350 MPa for Weathering Steel, 550-700 MPa for High Strength quenched & tempered steel, 300-450 MPa for Medium and High strength microalloyed steel.