Design of Steel Structures 1000+ MCQ with answer for NDA

1. When the bolts are subjected to reversal of stresses, the most suitable type of bolt is
A. Black bolt
B. Ordinary unfinished bolt
C. Turned and fitted bolt
D. High strength bolt
Answer : D

2. 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

3. In case horizontal stiffeners are not used, the distance between vertical legs of flange angles at the top and bottom of a plate girder, is known as
A. Overall depth
B. Clear depth
C. Effective depth
D. None of these
Answer : B

4. The strength of a riveted lap joint is equal to its
A. Shearing strength
B. Bearing strength
C. Tearing strength
D. Least of (a), (b) and (c)
Answer : D

5. 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
A. 75 t²/h
B. 125 t³/h²
C. 125 t²/h
D. 175 t²/h Where, t = the web thickness in mm and h = the outstand of stiffener in mm
Answer : C

6. The main assumption of the method of simple design of steel frame work, is:
A. Beams are simply supported
B. All connections of beams, girders and trusses are virtually flexible
C. Members in compression are subjected to forces applied at appropriate eccentricities
D. All the above
Answer : D

7. The maximum permissible slenderness ratio of compression member carrying dead and superimposed load, is
A. 180
B. 200
C. 250
D. 350
Answer : A

8. If d is the distance between the flange angles, the vertical stiffeners in plate girders are spaced not greater than
A. d
B. 1.25 d
C. 1.5 d
D. 1.75 d
Answer : C

9. As per IS : 800, for compression flange, the outstand of flange plates should not exceed
A. 12 t
B. 16 t
C. 20 t
D. 25 t Where t = thickness of thinnest flange plate
Answer : B

10. Study the following statements. (i) Top lateral bracing prevents the sides-way buckling of the chord. (ii) Sway bracing keeps the rectangular shape of the bridge crosssection. (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 : B

11. 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 : C

12. Effective sectional area of a compression member is:
A. Gross sectional area - area of rivet hole
B. Gross sectional area + area of rivet hole
C. Gross sectional area × area of rivet hole
D. Gross sectional area + area of rivet hole
Answer : A

13. According to IS: 800-1962, the coefficient of expansion of steel per degree centigrade per unit length, is taken as
A. 0.000008
B. 0.000010
C. 0.000012
D. 0.000014
Answer : C

14. Pick up the incorrect statement from the following:
A. The nominal diameter of a rivet is its diameter before driving
B. The gross diameter of a rivet is the diameter of rivet hole
C. The gross area of a rivet is the cross-sectional area of the rivet hole
D. The diameter of a rivet hole is equal to the nominal diameter of the rivet plus 1.5 mm
Answer : D

15. Area of openings for buildings of large permeability is more than
A. 10% of wall area
B. 20% of wall area
C. 30% of wall area
D. 50% of wall area
Answer : B

16. 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

17. Slenderness ratio of a compression member is
A. Moment of inertia/Radius of gyration
B. Effective length/Area of cross-section
C. Radius of gyration/Effective length
D. Radius of gyration/ Area of cross-section
Answer : C

18. 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

19. The average shear stress for rolled steel beam section, is
A. 845 kg/cm²
B. 945 kg/cm²
C. 1025 kg/cm²
D. 1500 kg/cm²
Answer : B

20. For simply supported beams, the maximum permitted deflection, is
A. 1/325 of the span
B. 1/350 of the span
C. 1/375 of the span
D. 1/400 of the span
Anwer : A

21. Tacking rivets in tension members, are provided at a pitch in line not exceeding
A. 25 cm
B. 50 cm
C. 75 cm
D. 100 cm
Answer : D

22. If P is the wind pressure in kg/cm², v is the velocity in km/hour and K is a constant of proportionality, then
A. P = K/v²
B. v = K/P²
C. P = Kv²
D. P = Kv
Answer : C

23. For steel members not exposed to weather, the thickness of steel should not be less than
A. 4.5 mm
B. 6 mm
C. 8 mm
D. 10 mm
Answer : B

24. 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 : B

25. 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 : A

26. Pick up the correct statement from the following:
A. The ends of a strut, are connected together with two rivets
B. The members of strut will have at least two connections spaced equidistant in their length
C. The members when separated back-to-back, the connecting rivets should pass through solid washer or packing
D. All the above
Answer : D

27. 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 : C

28. Pick up the correct statement from the following:
A. When the gauge distance is larger than the pitch, the failure of the section may occur in a zig-zag line
B. When the gauge distance is smaller than the pitch, the failure of the section may occur in a straight right angle section through the centre of rivet holes
C. When the gauge distance and pitch are both equal, the failure to the section becomes more likely as the diameter of the holes increases
D. All the above
Answer : D

29. Pick up the correct statement from the following:
A. Dead load includes self-weight of the structure and super-imposed loads permanently attached to the structure
B. Dead loads change their positions and vary in magnitude
C. Dead loads are known in the beginning of the design
D. None of these
Answer : A

30. For the economical design of a combined footing to support two equal column loads, the projections of beams in lower tier are kept such that bending moment under column is equal to
A. Bending moment at the centre of the beam
B. Half the bending moment at the centre of the beam
C. Twice the bending moment at the centre of the beam
D. None of these
Answer : A

31. Pick up the correct statement from the following:
A. Tacking rivets are used if the minimum distance between centres of two adjacent rivets exceeds 12 t or 200 mm, whichever is less
B. Tacking rivets are not considered to calculate stress
C. Tacking rivets are provided throughout the length of a compression member composed of two components back to back
D. All the above
Answer : D

32. The web crippling due to excessive bearing stress can be avoided by
A. Increasing the web thickness
B. Providing suitable stiffener
C. Increasing the length of the bearing plates
D. None of the above
Answer : C

33. 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

34. The diameter of base of conical flare of a steel stack is
A. Less than d
B. Equal to d
C. More than d
D. Any of the above Where d is the diameter of the cylindrical part
Answer : C

35. 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

36. The best arrangement to provide unified behaviour in built up steel columns is by
A. Lacing
B. Battening
C. Tie plates
D. Perforated cover plates
Answer : A

37. According to IS : 800-1962 the permissible bending stress in steel slab plates, is
A. 1500 kg/cm²
B. 1420 kg/cm²
C. 2125 kg/cm²
D. 1890 kg/cm²
Answer : D

38. A beam is defined as a structural member subjected to
A. Axial loading
B. Transverse loading
C. Axial and transverse loading
D. None of these
Answer : B

39. According to the Unwin's formula, if t is thickness of the plate in mm, the nominal diameter of the rivet, is
A. d = 1.91 t
B. d = 1.91 t2
C. d = 1.91 ?t
D. d = 1.91 ?t
Answer : C

40. 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, i n is
A. 2
B. 4
C. 6
D. 8
Answer : D

41. The sway bracing is designed to transfer
A. 2Vi % of the top panel wind load to bottom bracing
B. 10% of the top panel wind load to bottom bracing
C. 25% of the top panel wind load to bottom bracing
D. 50% of the top panel wind load to bottom bracing
Answer : D

42. The area A_p of cover plates in one flange of a built up beam, is given by
A. A_p = Z_reqr + Z_beam/h
B. A_p = Z_reqr + Z_beam/A
C. A_p = Z_reqr × Z_beam/h
D. A_p = Z_reqr - Z_beam/h
Answer : D

43. The mechanism method of plastic analysis satisfies
A. Equilibrium and mechanism conditions
B. Equilibrium and plastic moment conditions
C. Mechanism and plastic moment conditions
D. Equilibrium condition only
Answer : A

44. A fillet weld may be termed as
A. Mitre weld
B. Concave weld
C. Convex weld
D. All the above
Answer : D

45. The internal pressure coefficient on walls for buildings with large permeability is taken as
A. ± 0.2
B. ±0.5
C. ± 0.7
D. 0
Answer : C

46. For a column of height L fixed in position and direction both at its top and bottom, its effective length, is
A. L
B. 1/?2 × L
C. ½ L
D. 2L
Answer : C

47. The effective length of a double angle strut with angles placed back to back and connected to both the sides of a gusset plate, by not less than two rivets, is
A. 0.5 L
B. 0.67 L
C. 0.85 L
D. 2 L
Answer : C

48. Bending compressive and tensile stresses respectively are calculated based on
A. Net area and gross area
B. Gross area and net area
C. Net area in both cases
D. Gross area in both cases
Answer : B

49. The most commonly used sections in lateral system to carry shear force in built up columns, are
A. Rolled steel flats
B. Rolled angles
C. Rolled channels
D. All the above
Answer : D

50. A structural member subjected to compressive stress in a direction parallel to its longitudinal axis, is generally known as
A. Column
B. Stanchion
C. Post
D. All the above
Answer : D