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design of steel structures MCQs

Practise focused design of steel structures questions with marked answers for exam preparation and subject revision.

design of steel structures Mcqs
1. By providing sufficient edge distance, which of the following failures of riveted joint can be avoided ?
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A. shear failure of the rivet

B. shear failure of the plate

C. tension failure of the plate

D. crushing failure of the rivet

2. Rivets connecting flange angles to cover plates in a plate girder are subjected to_________________?
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A. horizontal shear only

B. vertical load only

C. both (A. and (B.

D. none of the above

3. The moment of inertia of the pair of vertical stiffeners about the center line of the web should not be less than__________________?
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A. 1.5d/C2

B. 1.5dV/C

C. 1.5dY/C3

D. 1.5d/C

4. Maximum pitch of rivets, used in steel stacks, is limited to_______________?
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A. re t is thickness of thinner plate being connected

B. 161

C. 121

D. 101

E. 6t

5. Which of the following types of riveted joint is free from bending stresses ?
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A. lap joint

B. none of the above

C. butt joint with single cover plate

D. butt joint with double cover plates
6. The mechanism method of plastic analysis satisfies___________________?
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A. equilibrium condition only

B. equilibrium and mechanism conditions

C. equilibrium and plastic moment conditions

D. mechanism and plastic moment conditions

7. Normally, the angle of roof truss with asbestos sheets should not be less than_______________?
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A. 40

B. 30

C. 35

D. 26/2

8. 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________________?
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A. 0.67 L

B. 0.8 L

C. L

D. 1.5 L

9. A circular column section is generally not used in actual practice because________________?
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A. it is difficult to connect beams to the round sections

B. all of the above

C. it cannot carry the load safely

D. it is uneconomical

10. The best arrangement to provide unified behaviour in built up steel columns is by______________?
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A. tie plates

B. lacing

C. perforated cover plates

D. battening

11. If the thickness of plate to be connected by a rivet is 16 mm, then suitable size of rivet as per Unwins formula will be__________________?
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A. 27 mm

B. 20 mm

C. 24 mm

D. 16 mm

12. The allowable shear stress in the web of mild steel beams decreases with__________________?
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A. decrease in h/t ratio

B. re h is height and t is thickness

C. increase in h/t ratio

D. increase in height

E. decrease in thickness

13. Shape factor is a property which depends________________?
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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

14. The internal pressure coefficient on walls for buildings with large permeability is taken as_______________?
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A. 0.5

B. 0

C. 0.7

D. 0.2

15. The effective length of a fillet weld should not be less than___________________?
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A. six times the weld size

B. two times the weld size

C. four times the weld size

D. weld size

16. If the thickness of thinnest outside plate is 10 mm, then the maximum pitch of rivets in tension will be taken as______________?
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A. 120 mm

B. 160 mm

C. 200 mm

D. 300 mm

17. The use of tie plates in laced columns is_________________?
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A. not prohibited

B. prohibited

C. permitted at start and end of lacing system only

D. permitted between two parts of the lacing

18. Area of openings for buildings of large permeability is more than_________________?
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A. 20% of wall area

B. 50% of wall area

C. 30% of wall area

D. 10% of wall area

19. The ratio of plastic section modulus to elastic section modulus__________________?
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A. is always greater than 1

B. is equal to 1

C. is always less than 1

D. can be less than 1

20. Bearing stiffener in a plate girder is used to__________________?
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A. decrease the effective depth of web

B. prevent excessive deflection

C. prevent buckling of web

D. transfer the load from the top flange to the bottom one

21. In case of plastic design, the calculated maximum shear capacity of a beam as per IS:800 shall be________________?
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A. 0.65 Awfy

B. 0.85 Awfy

C. 0.75 Awfy

D. re, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel

E. 0.55 Awfy
22. In moment resistant connections, the moment resistance of riveted connection depends upon________________?
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A. tension in rivets

B. strength of rivets in bearing

C. shear in rivets

D. compression in rivets

23. Which of the following conditions is to be satisfied both in elastic and plastic analysis ?
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A. equilibrium condition

B. plastic moment condition

C. yield condition

D. mechanism condition

24. The actual thickness of butt weld as compared to the thickness of plate is usually________________?
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A. more

B. equal

C. none of the above

D. less

25. Bending compressive and tensile stresses respectively are calculated based on_________________?
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A. net area and gross area

B. gross area and net area

C. net area in both cases

D. gross area in both cases

26. Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is_________________?
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A. 70%

B. 50%

C. 60%

D. 40%

27. The bracing provided in the plane of end posts is called__________________?
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A. portal bracing

B. top lateral bracing

C. bottom lateral bracing

D. sway bracing

28. The mechanism method and the statical method give__________________?
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A. upper and lower bounds respectively on the strength of structure

B. lower bound on the strength of structure

C. upper bound on the strength of structure

D. lower and upper bounds respectively on the strength of structure

29. According to IS Specifications, the maximum pitch of rivets in compression is_____________________?
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A. lesser of 200 mm and 161

B. lesser of 200 mm and 12 t

C. re t is thickness of thinnest outside plate or angle

D. lesser of 300 mm and 32 t

E. lesser of 3 00 mm and 24 t

30. The maximum slenderness ratio of a compression member carrying both dead and superimposed load is___________________?
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A. 180

B. 250

C. 350

D. 200

31. The relation between intensity of wind pressure p and velocity of wind V is taken as_______________?
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A. paV2

B. p a (1/V)

C. paV2

D. pa V

32. In a gusseted base, when the end of the column is machined for complete bearing on the base plate, then the axial load is assumed to be transferred to base plate__________________?
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A. 75% by direct bearing and 25% through fastenings

B. fully by direct bearing

C. fully through fastenings

D. 50% by direct bearing and 50% through fastenings
33. When the axis of load lies in the plane of rivet group, then the rivets are subjected to________________?
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A. only shear stresses

B. only tensile stresses

C. both (A) and (B)

D. none of the above

34. As compared to field rivets, the shop rivets are________________?
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A. any of the above

B. stronger

C. equally strong

D. weaker

35. The slenderness ratio of lacing bars should not exceed________________?
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A. 100

B. 120

C. 145

D. 180

36. The allowable tensile stress in structural mild steel plates for steel tank is assumed as________________?
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A. 150.0 MPa on gross area

B. 105.5 MPa on net area

C. 105.5 MPa on gross area

D. 95.0 MPa on net area

37. Bolts are most suitable to carry_________________?
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A. bending

B. shear and bending

C. axial tension

D. shear

38. When the bolts are subjected to reversal of stresses, the most suitable type of bolt is________________?
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A. ordinary unfinished bolt

B. turned and fitted bolt

C. black bolt

D. high strength bolt
39. Pitch of tacking rivets, when double angles connected back to back and acting as tension members should not be more than_________________?
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A. 300 mm

B. 1000 mm

C. 600 mm

D. 500 mm

40. According to IS:800, in the Merchant Rankine formula the value of imperfection index (n) is_______________?
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A. 1.4

B. 1.8

C. 2

D. 1

41. The bracing between two columns of a steel tank will be designed to resist_________________?
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A. column loads + full horizontal shear due to wind or earthquake

B. horizontal shear due to wind or earthquake only

C. horizontal, shear due to wind or earthquake + 2.5% of column loads

D. column loads + 2.5% of horizontal shear due to wind or earthquake

42. The least dimension in case of a circular column of diameter D is taken as_______________?
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A. 0.5 D

B. 0.88 D

C. 0.68 D

D. D

43. Angle of inclination of the lacing bar with the longitudinal axis of the column should preferably be between____________________?
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A. 10 to 30

B. 40 to 70

C. 90

D. 30 to 40

44. The number of seismic zones in which the country has been divided are_________________?
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A. 6

B. 5

C. 3

D. 7

45. For a compression member with double angle section, which of the following section will give larger value of minimum radius of gyration?
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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)

46. The risk coefficient k, depends on__________________?
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A. mean probable design life of structures

B. basic wind speed

C. both (A) and (B)

D. none of the above

47. As per IS : 800, for compression flange, the outstand of flange plates should not exceed________________?
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A. 201

B. 121

C. 251

D. 161
48. The effect of racking forces is considered in the design of_________________?
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A. lateral braces

B. correct answer is</strong>

C. chord members

49. The sway bracing is designed to transfer____________________?
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A. 25% of the top panel wind load to bottom bracing

B. 2Vi % of the top panel wind load to bottom bracing

C. 50% of the top panel wind load to bottom bracing

D. 10% of the top panel wind load to bottom bracing

50. Shear buckling of web in a plate girder is prevented by using________________?
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A. none of the above

B. vertical intermediate stiffener

C. horizontal stiffener at neutral axis

D. bearing stiffener