steel design columns beams roof trusses plate girders connections construction - Question Bank

1. What is the main difference between hot-rolled and cold-formed steel sections?
A) Hot-rolled sections are formed at room temperature, while cold-formed sections are formed at high temperatures.
B) Hot-rolled sections are formed by passing steel through rollers at high temperatures, resulting in rounded corners, while cold-formed sections are shaped at ambient temperature, often resulting in sharper corners and increased yield strength.
C) Hot-rolled sections are generally lighter and thinner than cold-formed sections.
D) Cold-formed sections are primarily used for primary structural members, while hot-rolled are for secondary elements.
2. What does 'ductility' mean for structural steel?
A) The ability to resist high temperatures without deforming
B) The ability of the material to undergo significant plastic deformation before fracture
C) The stiffness of the material
D) The resistance to impact loads
3. What is the primary advantage of using steel as a construction material?
A) High density and weight
B) High strength-to-weight ratio, ductility, and predictability
C) Poor resistance to tension
D) Susceptibility to moisture absorption
4. What is 'corrosion protection' for steel structures?
A) Painting the steel members
B) Applying coatings like galvanization or specialized paints to prevent rust and degradation
C) Using stainless steel members
D) Regular cleaning of steel surfaces
5. What is a 'moment frame' in steel construction?
A) A frame where connections are designed to be pinned
B) A frame where beam-to-column connections are rigid (moment resisting), allowing the frame to resist lateral loads through flexure of its members
C) A frame primarily designed for axial loads
D) A frame composed solely of trusses
6. Which method of fire protection for steel involves encasing the steel member with a material like concrete or gypsum board?
A) Intumescent coatings
B) Spray-applied fire-resistive materials (SFRM)
C) Cementitious materials
D) All of the above
7. What is the purpose of 'fireproofing' in steel construction?
A) To increase the strength of steel members
B) To protect steel members from significant loss of strength and stiffness during a fire, extending the time before structural collapse
C) To prevent corrosion of steel
D) To improve the appearance of steel structures
8. What is 'erection tolerance' in steel construction?
A) The acceptable deviation from the designed dimensions or positions of erected steel members
B) The time allowed for completing the erection process
C) The load-carrying capacity of temporary supports
D) The safety margin for workers
9. What is a common method for ensuring the stability of a steel frame during construction?
A) Relying solely on permanent bracing
B) Using temporary bracing and sequencing of erection
C) Increasing the size of all members
D) Waiting for the concrete slabs to be cast
10. What is 'site erection' in steel construction?
A) The process of manufacturing steel components in a factory
B) The process of assembling and erecting fabricated steel members at the construction site
C) The design and detailing of steel connections
D) The inspection of finished steel structures
11. What is 'shop fabrication' in steel construction?
A) The assembly of steel members at the construction site
B) The manufacturing of steel components in a controlled factory environment
C) The process of erecting steel structures
D) The design of steel elements
12. What is the throat thickness of a fillet weld?
A) The length of the weld along its axis
B) The perpendicular distance from the root of the weld to the face of the weld
C) The width of the weld bead
D) The depth of penetration into the base metal
13. What is a 'fillet weld'?
A) A weld made in a V-groove
B) A weld deposited in a corner formed by two surfaces at approximately right angles
C) A weld made on the surface of a plate
D) A weld used for joining pipes
14. What is 'slip resistance' in bolted connections, particularly for high-strength bolts?
A) The ability of the connection to allow controlled slippage
B) The resistance to relative movement between connected parts due to friction between the faying surfaces
C) The capacity of the bolt to stretch before breaking
D) The resistance to pull-out of the bolt
15. What is the primary failure mode considered for bolts in a shear connection?
A) Tension yielding of the bolt shank
B) Shear failure of the bolt shank
C) Bearing failure of the connected plates
D) Buckling of the bolt
16. What is a 'moment resisting connection'?
A) A connection designed to resist only axial forces
B) A connection designed to transfer and resist bending moments in addition to shear and axial forces
C) A connection that allows free rotation between members
D) A connection that uses bolts in standard clearance holes
17. Which type of connection is generally considered more rigid and can transfer bending moments?
A) Bolted connection
B) Welded connection
C) Riveted connection
D) Pinned connection
18. What is the primary function of connections in steel structures?
A) To increase the aesthetic appeal of the structure
B) To transfer forces and moments between structural members, ensuring the integrity of the structure
C) To reduce the overall weight of the structure
D) To provide fire resistance
19. What are 'purlins' in a roof structure?
A) Main supporting beams that carry floor loads
B) Members that span between trusses and support the roofing sheets or panels
C) Vertical columns supporting the roof structure
D) Diagonal bracing members
20. What is a 'pin-jointed' assumption for truss analysis?
A) Members are rigidly connected at joints
B) Joints are assumed to be smooth pins, allowing free rotation, and only axial forces exist in members
C) Members are connected by bolts
D) Joints can transfer bending moments
21. Which method is commonly used for analyzing forces in truss members?
A) Finite Element Method
B) Method of Joints and Method of Sections
C) Virtual Work Method
D) Direct Stiffness Method
22. What is the role of 'web members' (verticals and diagonals) in a roof truss?
A) To carry the primary bending moment
B) To resist shear forces and stabilize the chords against buckling
C) To provide support for roofing materials
D) To increase the overall weight of the truss
23. What type of stress do the bottom chord members of a simply supported roof truss typically experience?
A) Tension
B) Compression
C) Shear
D) Pure bending
24. What type of stress do the top chord members of a simply supported roof truss typically experience?
A) Tension
B) Compression
C) Shear
D) Pure bending
25. A typical roof truss consists of members arranged in:
A) A grid pattern
B) Triangular units
C) A lattice structure
D) A series of parallel beams
26. What is the primary function of roof trusses in steel structures?
A) To support vertical loads from floors
B) To span large distances and support roof loads, transferring them to the main structure
C) To provide lateral bracing to the building
D) To act as primary vertical load-bearing elements
27. What is a 'web splice' in a plate girder?
A) A connection between the flanges
B) A connection made in the web plate to join two sections end-to-end
C) A stiffener welded to the web
D) A connection to a supporting beam
28. What is a 'biaxial bending' scenario for a steel member?
A) Bending about one principal axis
B) Bending about two perpendicular principal axes simultaneously
C) Bending due to axial load and shear force
D) Torsional loading
29. What is the purpose of intermediate stiffeners in a plate girder?
A) To increase the moment of inertia of the girder
B) To provide lateral support to the compression flange
C) To prevent or reduce web buckling due to shear forces
D) To increase the overall depth of the girder
30. What is the main challenge in designing plate girders compared to rolled steel beams?
A) Higher material cost
B) Greater susceptibility to shear failure
C) Potential for web buckling and the need for intermediate stiffeners
D) Limited availability of standard sections
31. A plate girder typically consists of:
A) Two flange plates and a single web plate
B) Two flange plates and two web plates
C) A single I-section
D) A box section made of four plates
32. What are 'plate girders' primarily used for in steel structures?
A) Short spans with heavy loads
B) Long spans requiring high bending resistance
C) Columns subjected to axial loads
D) Roof purlins
33. What is the maximum permissible deflection for a simply supported steel beam under service loads, as per general guidelines?
A) Span/150
B) Span/250
C) Span/350
D) Span/500
34. Which factor influences the design bending strength of a steel beam?
A) Its slenderness ratio
B) Its yield strength and section properties, and susceptibility to lateral torsional buckling
C) The type of end connections
D) The ambient temperature
35. What is 'web crippling' in a steel beam?
A) Failure of the web due to excessive shear
B) Buckling of the web under concentrated loads or reactions
C) Local buckling of the web due to bending stresses
D) Yielding of the web material
36. In IS 800:2007, what is the condition for a beam to be considered 'laterally supported' and not prone to lateral torsional buckling?
A) When the compression flange is continuously braced
B) When the shear stress in the web is below a critical value
C) When the deflection is within permissible limits
D) When the beam is made of high-strength steel
37. What is the purpose of 'stiffeners' in a steel beam?
A) To increase the bending strength
B) To prevent or delay local buckling of flanges and web, and web crippling
C) To provide attachment points for cladding
D) To reduce the self-weight of the beam
38. What is 'lateral torsional buckling' in a steel beam?
A) Buckling of the web due to shear stress
B) Local buckling of the flange
C) Buckling of the beam in a direction perpendicular to its plane of bending, accompanied by twisting
D) Failure due to excessive deflection
39. Which type of steel beam is most commonly used in building construction due to its efficiency in resisting bending and shear?
A) Solid rectangular bar
B) Hollow circular section
C) Rolled steel I-section (Universal Beam)
D) Channel section
40. What is the primary function of a steel beam in a building structure?
A) To resist axial compression
B) To transfer shear forces and bending moments from slabs to columns or walls
C) To provide stability against wind loads
D) To act as a primary vertical load-bearing element
41. Which formula is commonly used to calculate the design compressive strength of a steel column based on IS 800:2007?
A) Euler's formula
B) Rankine's formula
C) Secant formula
D) The formula incorporating the design stress and effective area
42. What is a 'battens' system in built-up steel columns?
A) A system of diagonal members connecting two vertical components
B) A system of flat plates connecting two vertical components
C) A system of reinforcing bars embedded within the steel section
D) A system of transverse stiffeners
43. What is the purpose of lacing in built-up steel columns?
A) To increase the overall strength of the column
B) To provide lateral support to the individual components and prevent local buckling
C) To reduce the weight of the column
D) To facilitate connections to other structural members
44. Which failure mode is typically associated with short, stocky steel columns under axial compression?
A) Buckling
B) Yielding
C) Creep
D) Fatigue
45. What is the effective length of a steel column fixed at both ends and having no restraint against rotation?
A) L
B) 0.5L
C) 0.67L
D) 2L
46. According to IS 800:2007, what is the maximum permissible slenderness ratio for a main member carrying compressive loads?
A) 180
B) 250
C) 350
D) 400
47. What is 'slenderness ratio' in the context of steel columns?
A) The ratio of the column's cross-sectional area to its length
B) The ratio of the column's effective length to its radius of gyration
C) The ratio of the column's moment of inertia to its cross-sectional area
D) The ratio of the column's yield strength to its ultimate tensile strength
48. Which type of steel column is most efficient for resisting high axial loads?
A) Single angle section
B) Built-up section
C) I-section (Rolled steel joist)
D) Channel section
49. What is the primary function of a steel column in a building structure?
A) To resist lateral loads like wind and seismic forces
B) To transfer axial loads from beams and slabs to the foundation
C) To provide lateral stability to the structure
D) To span distances between supports
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