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1000+ Design of Steel Structures MCQ for LSAT [Solved]

Thursday 9th of March 2023

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1. The maximum spacing of vertical stiffeners is
A. 1.33 d
B. 1.25 d
C. 1.5 d
D. 1.75 d Where d is the distance between flange angles
Answer : C
2. The thickness t of a single flat lacing should not be less than
A. 1/30th length between inner end rivets
B. 1/40th length between inner end rivets
C. 1/50th length between inner end rivets
D. 1/60th length between inner end rivets
Answer : B
3. The risk coefficient k, depends on
A. Mean probable design life of structures
B. Basic wind speed
C. Both (A) and (B)
D. None of the above
Answer : C
4. Shape factor is a property which depends
A. Only on the ultimate stress of the material
B. Only on the yield stress of the material
C. Only on the geometry of the section
D. Both on the yield stress and ultimate stress of material
Answer : C
5. The failure of a web plate takes place by yielding if the ratio of the clear depth to thickness of the web, is less than
A. 45
B. 55
C. 62
D. 82
Answer : D
6. For determination of allowable stress in axial compression, Indian Standard Institution has adopted
A. Euler's formula
B. Rankine formula
C. Perry Robertson formula
D. Secant formula
Answer : D
7. By providing sufficient edge distance, which of the following failures of riveted joint can be avoided?
A. Tension failure of the plate
B. Shear failure of the rivet
C. Shear failure of the plate
D. Crushing failure of the rivet
Answer : C
8. When the depth of a plate girder is at least n times the depth of vertical leg of the flange angles, the girder is known as deep plate girder, if n is
A. 2
B. 4
C. 6
D. 8
Answer : D
9. The strength of ISA 125 = 75 × 10 mm used as a tie member with its longer leg connected at the ends by 27 mm diameter rivets, is
A. 26,000 kg
B. 26,025 kg
C. 26,050 kg
D. 26,075 kg
Answer : D
10. The allowable tensile stress in structural mild steel plates for steel tank is assumed as
A. 95.0 MPa on net area
B. 105.5 MPa on net area
C. 105.5 MPa on gross area
D. 150.0 MPa on gross area
Answer : B
11. The live load for a sloping roof with slope 15°, where access is not provided to roof, is taken as
A. 0.65 kN/m²
B. 0.75 kN/m²
C. 1.35 kN/m²
D. 1.50 kN/m²
Answer : A
12. The rolled steel I-sections are most commonly used as beams because these provide
A. Large moment of inertia with less cross-sectional area
B. Large moment of resistance as compared to other section
C. Greater lateral stability
D. All the above
Answer : D
13. 2.Compression members composed of two channels back-to-back and separated by a small distance are connected together by riveting so that the minimum slenderness ratio of each member between the connections, does not exceed
A. 40
B. 50
C. 60
D. 70
Answer : A
14. If d is the distance between the flange angles, the vertical stiffeners in plate girders without horizontal stiffeners, are spaced at a distance not less than
A. 0.15 d
B. 0.22 d
C. 0.33 d
D. 0.44 d
Answer : C
15. Pitch of tacking rivets, when double angles connected back to back and acting as tension members should not be more than
A. 500 mm
B. 600 mm
C. 1000 mm
D. 300 mm
Answer : C
16. If a pair of angles placed back to back in tension are connected by one leg of each angle, the net effective area of the section, is
A. a - [b/{1 + 0.35 (b/a)}]
B. a + [b/{1 + 0.35 (b/a)}]
C. a - [b/{1 + 0.2 (b/a)}]
D. a + [b/{1 + 0.2 (b/a)}]
Answer : D
17. The gross diameter of a rivet is the diameter of
A. Cold rivet before driving
B. Rivet after driving
C. Rivet hole
D. None of these
Answer : B
18. Other conditions being same, the load factor in indeterminate structures is
A. Equal to load factor in determinate structures
B. More than the load factor in determinate structures
C. Less than the load factor in determinate structures
D. Unpredictable
Answer : B
19. The maximum slenderness ratio of a compression member carrying both dead and superimposed load is
A. 180
B. 200
C. 250
D. 350
Answer : A
20. Tongue plates are provided in a steel girder at
A. The upper flange
B. The lower flange
C. The upper end of the web
D. The upper and lower ends of the web
Answer : D
21. The connection of one beam to another beam by means of an angle at the bottom and an angle at the top, is known as
A. Unstiffened seated connection
B. Stiffened seated connection
C. Seated connection
D. None of these
Answer : C
22. If the thickness of plate to be connected by a rivet is 16 mm, then suitable size of rivet as per Unwin's formula will be
A. 16 mm
B. 20 mm
C. 24 mm
D. 27 mm
Answer : C
23. A steel beam supporting loads from the floor slab as well as from wall is termed as
A. Stringer beam
B. Lintel beam
C. Spandrel beam
D. Header beam
Answer : C
24. Angle of inclination of the lacing bar with the longitudinal axis of the column should preferably be between
A. 10° to 30°
B. 30° to 40°
C. 40° to 70°
D. 90°
Answer : C
25. Web crippling generally occurs at the point where
A. Bending moment is maximum
B. Shearing force is minimum
C. Concentrated loads act
D. Deflection is maximum
Answer : C
26. Minimum pitch provided in riveted steel tanks is
A. 1.5 d
B. 2.0 d
C. 2.5 d
D. 3.0 d Where d is diameter of rivets
Answer : D
27. A fillet weld may be termed as
A. Mitre weld
B. Concave weld
C. Convex weld
D. All the above
Answer : D
28. According to IS Specifications, the maximum pitch of rivets in compression is
A. Lesser of 200 mm and 12 t
B. Lesser of 200 mm and 16 t
C. Lesser of 300 mm and 32 t
D. Lesser of 3 00 mm and 24 t Where t is thickness of thinnest outside plate or angle
Answer : A
29. For a standard 45° fillet, the ratio of size of fillet to throat thickness is
A. 1 : 1
B. 1 : ?2
C. ?2 : 1
D. 2 : 1
Answer : C
30. The net area of round bars to resist the tension, is the area of cross section at
A. Mid-section
B. Root of the thread
C. Difference of (a) and (b)
D. None of these
Answer : B
31. The minimum width B of a solid casing for a cased beam, is equal to
A. B = b + 25 mm
B. B = b + 50 mm
C. B = b + 75 mm
D. B = b + 100 mm
Answer : D
32. The minimum pitch of rivet holes of diameter d should not be less than
A. d
B. 1.25 d
C. 1.5 d
D. 2.5 d
Answer : D
33. For a cantilever beam of length L continuous at the support and unrestrained against torsion at the support and free at the end, the effective length l is equal to
A. l = L
B. l = 2L
C. l = 0.5L
D. l = 3L
Answer : D
34. The centrifugal force due to curvature of track is assumed to act on the bridge at a height of
A. 1.23 m above the rail level
B. 1.50 m above the rail level
C. 1.83 m above the rail level
D. 2.13 m above the rail level
Answer : C
35. A tension member, if subjected to possible reversal of stress due to wind, the slenderness ratio of the member should not exceed
A. 180
B. 200
C. 300
D. 350
Answer : D
36. The permissible stress to which a structural member can be subjected to, is known as
A. Bearing stress
B. Working stress
C. Tensile stress
D. Compressive stress
Answer : B
37. In the cross-section of a weld, throat is the
A. Minimum dimension
B. Average dimension
C. Maximum dimension
D. None of the above
Answer : A
38. Pick up the correct statement from the following:
A. Loaded columns are supported on column bases
B. Column bases transmit the column load to the concrete foundation
C. Column load is spread over a large area on concrete
D. All the above
Answer : D
39. Factor of safety is the ratio of
A. Yield stress to working stress
B. Tensile stress to working stress
C. Compressive stress to working stress
D. Bearing stress to working stress
Answer : A
40. If the moment of inertia of a section about its axis is I and its effective sectional area is A, its radius of gyration r about the axis, is
A. r = I/A
B. r = ?(I/A)
C. r = ?(I/A)
D. r = ?(A/I)
Answer : B
41. The distance measured along one rivet line from the centre of a rivet to the centre of adjoining rivet on an adjacent parallel rivet line, is called
A. Pitch of rivet
B. Gauge distance of rivet
C. Staggered pitch
D. All the above
Answer : C
42. If the pitch is 6 cm and rivet value is 4 tonnes, the number of rivets required for a riveted connection carrying an eccentric load of 15 tonnes at a distance of 30 cm from the centre line, is
A. 6
B. 8
C. 10
D. 15
Answer : B
43. The mechanism method and the statical method give
A. Lower and upper bounds respectively on the strength of structure
B. Upper and lower bounds respectively on the strength of structure
C. Lower bound on the strength of structure
D. Upper bound on the strength of structure Answer : B
44. The allowable stress in axial tension for rolled I-sections and channels, is taken as
A. 1420 kg/cm2
B. 1500 kg/cm2
C. 2125 kg/cm2
D. 1810 kg/cm2
Answer : B
45. Pick up the correct statement from the following:
A. Vertical stiffeners may be placed in pairs one on each side of the web
B. Single vertical stiffeners may be placed alternately on opposite sides of the web
C. Horizontal stiffeners may be placed alternately on opposite sides of the web
D. All the above
Answer : D
46. The effective length of a compression member of length L held in position and restrained in direction at one end and effectively restrained in direction but not held in position at the other end, is
A. L
B. 0.67 L
C. 0.85 L
D. 1.5 L
Answer : A
47. Maximum pitch of rivets, used in steel stacks, is limited to
A. 6 t
B. 10 t
C. 12 t
D. 16 t Where t is thickness of thinner plate being connected
Answer : B
48. When plates are exposed to weather, tacking rivets are provided at a pitch in line not exceeding (where t is the thickness of the outside plate).
A. 8 t
B. 16 t
C. 24 t
D. 32 t
Answer : B
49. Length of an outstanding leg of a vertical stiffener, may be taken equal to
A. 1/10th of clear depth of the girder plus 15 mm
B. 1/20th of clear depth of the girder plus 20 mm
C. 1/25th of clear depth of the girder plus 25 mm
D. 1/30th of clear depth of the girder plus 50 mm
Answer : C
50. To keep the intensity of bearing pressure between the column base and concrete, compressive throughout the length of the column base, the ratio of the moment M to axial load P should be
A. < L/3
B. < L/6
C. > L/3
D. > L/6
Answer : B
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