This set of Building Construction Questions and Answers for Aptitude test focuses on “Steel – 2”.
1. Red shortness is a defect occurring in steel due to the presence of an excess amount of ___________
a) Sulphur
b) Phosphorus
c) Sodium
d) Calcium
View Answer
Explanation: Red shortness is a defect occurring in steel due to the presence of an excess amount of sulphur. Steel with this defect cracks when being worked in a hot state.
2. Which of the following forms of steel is popularly known as rolled steel joist or beam?
a) I-section
b) Expanded metal
c) Corrugated sheet
d) Channel section
View Answer
Explanation: Steel is available in the market in various forms such as I-sections, expanded metal, angle sections, channel sections, corrugated sheets, etc. I-sections are popularly known as rolled steel joists or beams.
3. The structure of blister steel is homogeneous and is used for making edge tools.
a) True
b) False
View Answer
Explanation: The structure of blister steel is not homogeneous. It is full of cavities and cannot be used for making edge tools.
4. Cold shortness is a defect occurring in steel due to the presence of an excess amount of ___________
a) Potassium
b) Phosphorus
c) Sodium
d) Magnesium
View Answer
Explanation: Cold shortness is a defect occurring in steel due to the presence of an excess amount of phosphorus. Steel with this defect cracks when being worked in a cold state.
5. Which of the following statements about ribbed-torsteel bars is false?
a) They possess excellent bonding properties
b) They can be easily identified
c) They serve as efficient concrete reinforcement
d) Ordinary plain round bars posses better structural properties than these bars
View Answer
Explanation: Ribbed-torsteel bars are produced from ribbed-torsteel that is deformed high strength steel. They possess excellent bonding properties and can be easily identified. They possess better structural properties than ordinary plain round bars and they serve as efficient concrete reinforcement.
6. Which of the following is not a property of mild steel?
a) Mild steel is ductile and malleable
b) It can be used for all types of structural work
c) It cannot be magnetised permanently
d) Mild steel can be easily forged and welded
View Answer
Explanation: Mild steel has the following properties. Mild steel can be easily forged and welded and is ductile and malleable. It can be used for all types of structural work and it can be magnetised permanently.
7. Which of the following is not a property of hard steel?
a) Hard steel can be readily forged and welded
b) It rusts easily
c) Hard steel can be magnetised permanently
d) The specific gravity of hard steel is 7.90
View Answer
Explanation: Hard steel has the following properties. Hard steel cannot be readily forged and welded. It rusts easily and can be magnetised permanently. The specific gravity of hard steel is 7.90.
8. ___________ is the process of saturating the surface layer of steel with nitrogen by heating.
a) Nitriding
b) Normalising
c) Nitrating
d) Tempering
View Answer
Explanation: Nitriding is the process of saturating the surface layer of steel with nitrogen by heating. This process makes the steel hard and increases its resistance to corrosion.
9. Which process is used to make the steel soft?
a) Hardening
b) Nitriding
c) Annealing
d) Cementing
View Answer
Explanation: The process which is used to make the steel soft is called annealing. However, hardening is a process that is the reverse of the annealing process. With the process of hardening, the steel is made hard.
10. Which of the following operations involved in mechanical treatment of steel is used to make wires and rods?
a) Forging
b) Drawing
c) Pressing
d) Rolling
View Answer
Explanation: The various operations involved in mechanical treatment of steel are forging, drawing, pressing and rolling. Drawing is used to make wires and rods while forging is used to make bolts and cramps.
Sanfoundry Global Education & Learning Series – Building Construction.
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