Design of Steel Structures MCQ Pdf Download Steel Structures Objective Type Questions with Answers Pdf
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1. According to IS Specifications, the effective length of a column effectively held in position at both ends and restrained in direction at one end is taken as
A. 0.67 L
B. 0.8 L
C. L
D. 1.5 L
Answer: Option B
2. The effective length of a battened strut effectively held in position at both ends but not restrained in direction is taken as
A. 1.8 L
B. 1.3 L
C. 1.1 L
D. 1.5 L
Answer: Option C
3. The web crippling due to excessive bearing stress can be avoided by
A. increasing the web thickness
B. providing suitable stiffeners
C. increasing the length of the bearing plates
D. none of the above
Answer: Option C
4. In case of timber structures, the simple bending formula M = fz may be applied for
A. rectangular beams up to 300 mm depth
B. all rectangular beams
C. solid circular beams only
D. all square cross-section beams
Answer: Option A
5. The difference between gross diameter and nominal diameter for the rivets up to 25 mm diameter is
A. 1.0 mm
B. 1.5 mm
C. 2.0 mm
D. 2.5 mm
Answer: Option B
6. Diameter of a bolt hole is usually taken as
A. gross diameter of bolt
B. nominal diameter + 1.5 mm
C. nominal diameter + 2.0 mm
D. nominal diameter of bolt
Answer: Option B
7. A circular column section is generally not used in actual practice because
A. it is uneconomical
B. it cannot carry the load safely
C. it is difficult to connect beams to the round sections
D. all of the above
Answer: Option C
8. The moment-curvature relation at a plastic hinge is
A. linear
B. parabolic
C. constant moment for all curvatures
D. constant curvature for all moments
Answer: Option C
9. 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: Option B
10. Select the correct statement
A. Material cost of a rivet is higher than that of a bolt
B. Tensile strength of a bolt is lesser than that of a rivet
C. Bolts are used as a temporary fastening whereas rivets are used as permanent fastenings
D. Riveting is less noisy than bolting
Answer: Option C
11. The diameter of base of conical flare of a steel stack is (where d is the diameter of the cylindrical part)
A. less than d
B. equal to d
C. more than d
D. any of the above
Answer: Option C
12. The effective length of a fillet weld should not be less than
A. Two times the weld size
B. Four times the weld size
C. Six times the weld size
D. Weld size
Answer: Option B
13. The external wind pressure acting on a roof depends on
A. degree of permeability of roof
B. slope of roof
C. both (a) and (b)
D. none of the above
Answer: Option C
14. Minimum pitch provided in riveted steel tanks is (where d is diameter of rivets)
A. 1.5 d
B. 2.0 d
C. 2.5 d
D. 3.0 d
Answer: Option D
15. The portal bracing in a truss bridge is used to
A. Transfer load from top of end posts to bearings
B. Keep the rectangular shape of the bridge cross-section
C. Stiffen the structure laterally
D. Prevent the sides-way buckling of top chord
Answer: Option A
16. In case of timber structures, the form factor for solid circular cross-section is taken as
A. 1.18
B. 1.414
C. 1.67
D. 1.81
Answer: Option A
17. The allowable shear stress in the web of mild steel beams decreases with (where ‘h’ is height and t is thickness)
A. decrease in h/t ratio
B. increase in h/t ratio
C. decrease in thickness
D. increase in height
Answer: Option B
18. 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: Option C
19. As compared to field rivets, the shop rivets are
A. stronger
B. weaker
C. equally strong
D. any of the above
Answer: Option A
20. The number of seismic zones in which the country has been divided are
A. 3
B. 5
C. 6
D. 7
Answer: Option B
21. The forces acting on the web splice of a plate girder are
A. Axial forces
B. Shear and axial forces
C. Shear and bending forces
D. Axial and bending forces
Answer: Option C
22. The connection of intermediate vertical stiffeners to the web, not subjected to external loads, shall be designed for a minimum shear force (kN/m) of
(where, t = the web thickness in mm h = the outstand of stiffener in mm)
A. 75 t2/h
B. 125 t3/h2
C. 125 t2/h
D. 175 t2/h
Answer: Option C
23. If the loaded length of span in meters of a railway steel bridge carrying a single track is 6 m, then impact factor is taken as
A. 0
B. 0.5
C. between 0.5 and 1.0
D. 1.0
Answer: Option C
24. The ratio of plastic section modulus to elastic section modulus
A. is equal to 1
B. is always less than 1
C. is always greater than 1
D. can be less than 1
Answer: Option C
25. The effect of racking forces is considered in the design of
i) lateral braces
ii) chord members
The correct answer is
A. only (i)
B. only (ii)
C. both (i) and (ii)
D. none of the above
Answer: Option A
26. The bracing provided in the plane of end posts is called
A. sway bracing
B. portal bracing
C. top lateral bracing
D. bottom lateral bracing
Answer: Option B
27. 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: Option C
28. Battening is preferable when the
i) column carries axial load only
ii) space between the two main components is not very large
iii) column is eccentrically loaded
The correct answer is
A. only (i)
B. only (iii)
C. (i) and (ii)
D. (ii) and (iii)
Answer: Option C
29. For a compression member with double angle section, which of the following section will give larger value of minimum radius of gyration?
A. equal angles back to back
B. unqual legged angles with long legs back to back
C. unequal legged angles with short legs back to back
D. both (b) or (c)
Answer: Option B
30. Which of the following sections should preferably be used at places where torsion occurs?
A. Angle section
B. Channel section
C. Box type section
D. Any of the above
Answer: Option C
31. Rivets connecting flange angles to cover plates in a plate girder are subjected to
A. Horizontal shear only
B. Vertical load only
C. Both (A) and (B)
D. None of the above
Answer: Option A
32. Maximum pitch of rivets, used in steel stacks, is limited to (where t is thickness of thinner plate being connected)
A. 6t
B. 101
C. 121
D. 161
Answer: Option B
33. The use of tie plates in laced columns is
A. prohibited
B. not prohibited
C. permitted at start and end of lacing system only
D. permitted between two parts of the lacing
Answer: Option C
34. The actual thickness of butt weld as compared to the thickness of plate is usually
A. more
B. less
C. equal
D. none of the above
Answer: Option A
35. If the thickness of thinnest outside plate is 10 mm, then the maximum pitch of rivets in tension will be taken as
A. 120 mm
B. 160 mm
C. 200 mm
D. 300 mm
Answer: Option B
36. 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: Option B
37. Bearing stiffeners are provided at
i) the supports
ii) the mid span
iii) the point of application of concentrated loads
The correct answer is
A. only (i)
B. both (i) and (ii)
C. both (i) and (iii)
D. (i), (ii) and (iii)
Answer: Option C
38. According to IS Specifications, the maximum pitch of rivets in compression is (where t is thickness of thinnest outside plate or angle)
A. lesser of 200 mm and 12 t
B. lesser of 200 mm and 161
C. lesser of 300 mm and 32 t
D. lesser of 3 00 mm and 24 t
Answer: Option A
39. When the axis of load lies in the plane of rivet group, then the rivets are subjected to
A. only shear stresses
B. only tensile stresses
C. both (a) and (b)
D. none of the above
Answer: Option A
40. The slenderness ratio of a column supported throughout its length by a masonry wall is
A. zero
B. 10
C. 100
D. infinity
Answer: Option A
41. compression force in two end posts The pin of a rocker bearing in a bridge is designed for
A. bearing and shear
B. bending and shear
C. bearing and bending
D. bearing, shear and bending
Answer: Option D
42. The maximum permissible span of asbestos cement sheets is
A. 650 mm
B. 810 mm
C. 1250 mm
D. 1680 mm
Answer: Option D
43. As per IS : 875, for the purposes of specifying basic wind velocity, the country has been divided into
A. 4 zones
B. 5 zones
C. 6 zones
D. 7 zones
Answer: Option C
44. A butt weld is specified by
A. effective throat thickness
B. plate thickness
C. size of weld
D. penetration thickness
Answer: Option A
45. Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is
A. 40%
B. 50%
C. 60%
D. 70%
Answer: Option C
46. Study the following statements.
i) Top lateral bracing prevents the sidesway buckling of the chord.
ii) Sway bracing keeps the rectangular shape of the bridge cross-section.
iii) Sway bracing transfers the load from top of end posts to bearings.
The correct answer is
A. only (i)
B. both (i) and (ii)
C. both (i) and (iii)
D. all (i), (ii) and (iii)
Answer: Option B
47. Hudson’s formula gives the dead weight of a truss bridge as a function of
A. bottom chord area
B. top chord area
C. effective span of bridge
D. heaviest axle load of engine
Answer: Option A
48. Normally, the angle of roof truss with asbestos sheets should not be less than
A. 26/2°
B. 30°
C. 35°
D. 40°
Answer: Option B
49. To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be
A. 1
B. 2
C. 3
D. 4
Answer: Option B
50. If the floor is supported at or near the bottom but top chords of a bridge is not braced, then the bridge is called
A. Deck type
B. Through type
C. Half through type
D. Double deck type
Answer: Option C
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