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

1. If f is the maximum allowable bending stress in a tension member whose radius of gyration is r and depth is 2y, the required cross sectional area A is given by
A. A = My/fr²
B. A = My²/fr²
C. A = My/fr
D. A = My/f²r²
Answer : A

2. 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

3. Modified moment of inertia of sections with a single web, is equal to moment of inertia of the section about Y-Y axis at the point of maximum bending moment and is multiplied by the ratio of
A. Area of compression flange at the minimum bending moment to the corresponding area at the point of maximum bending moment
B. Area of tension flange at the minimum bending moment of the corresponding area at the point of maximum bending moment
C. Total area of flanges at the maximum bending moment to the corresponding area at the point of maximum bending moment
D. None of these
Answer : C

4. The size of a butt weld is specified by the effective throat thickness which in the case of incomplete penetration, is taken as
A. ½ of the thickness of thicker part
B. ¾ of the thickness of thicker part
C. ¾ of the thickness of thinner part
D. 7/8 of the thickness of thinner part
Answer : D

5. A single angle in tension is connected by one leg only. If the areas of connecting and outstanding legs are respectively a and b, net effective area of the angle, 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 : B

6. Rolled steel Tee-sections are used
A. As columns
B. With flat strips to connect plates in steel rectangular tanks
C. As built up sections to resist axial tension
D. None of these
Answer : B

7. 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

8. In double lacing, the thickness t of flat lacing is
A. t < 1/40 th length between inner end rivets
B. t < 1/50 th length between inner end rivets
C. t < 1/60 th length between inner end rivets
D. t < 1/70 th length between inner end rivets
Answer : C

9. 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

10. The effective length of a compression member of length L, held in position and restrained in direction at both ends, is
A. L
B. 0.67 L
C. 0.85 L
D. 1.5 L
Answer : B

11. The elastic strain for steel is about
A. 1/12 of strain at the initiation of strain hardening and about 1/120 of maximum strain
B. 1/2 of strain at the initiation of strain hardening and about 1/12 of maximum strain
C. 1/12 of strain at the initiation of strain hardening and 1/200 of maximum strain
D. 1/24 of strain at the initiation of strain hardening and about 1/200 of maximum strain
Answer : C

12. 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

13. With a percentage increase of carbon in steel, decreases its
A. Strength
B. Hardness
C. Brittleness
D. Ductility
Answer : D

14. 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 : B

15. 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

16. Net sectional area of a tension member, is equal to its gross section area
A. Plus the area of the rivet holes
B. Divided by the area of rivet holes
C. Multiplied by the area of the rivet holes
D. None of these
Answer : D

17. 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

18. The ratio of the span L of the filler joists to the depth d from the underside of the joist to the top of the structural concrete, should not exceed
A. 60
B. 45
C. 35
D. 25
Answer : C

19. If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be
A. 40 mm
B. 60 mm
C. 80 mm
D. 100 mm
Answer : B

20. 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

21. 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

22. 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 : C

23. 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 : C

24. 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 : B

25. For a rectangular section, the ratio of the maximum and average shear stresses, is
A. 1.5
B. 2.0
C. 2.5
D. 3.5
Answer : A

26. 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 : C

27. With usual notations of the letters, the shear stress f_s at any point of the cross-section is given by
A. f_s =FQ/It
B. f_s =Ft/IQ
C. f_s =It/FQ
D. f_s =IF/Qt
Answer : A

28. 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

29. Lug angles
A. Are used to reduce the length of connection
B. Are unequal angles
C. Increases shear lag
D. All the above
Answer : A

30. 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

31. According to IS : 800 - 71, the minimum thickness of a vertically stiffened web plate, shall not be less than
A. d/85
B. d/200
C. d/225
D. d/250
Answer : D

32. 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

33. 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

34. An imaginary line along which rivets are placed, is known as
A. Rivet line
B. Back line
C. Gauge line
D. All the above
Answer : D

35. The range of economical spacing of trusses varies from
A. L/3 to L/5
B. L/4 to 2L/5
C. L/3 to L/2
D. 2L/5 to 3L/5, where L is span
Answer : A

36. Normally, the angle of roof truss with asbestos sheets should not be less than
A. 26 ½°
B. 30°
C. 35°
D. 40°
Answer : B

37. Steel tanks are mainly designed for
A. Weight of tank
B. Wind pressure
C. Water pressure
D. Earthquake forces
Answer : C

38. 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

39. If the depth of two column sections is equal, then the column splice is provided
A. With filler plates
B. With bearing plates
C. With filler and hearing plates
D. None of these
Answer : D

40. 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

41. 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

42. 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

43. 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

44. 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

45. 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 : D

46. In factory buildings, the horizontal beams spanning between the wall columns supporting a wall covering, are called
A. Stringers
B. Trimmers
C. Girts
D. Lintels
Answer : C

47. Strengths of a rivet in single shearing, in bearing and in tearing are 3425 kg, 4575 kg and 5025 kg respectively. If the load in the member is 35 tonnes, the number of rivets required, is
A. 10
B. 11
C. 12
D. 13
Answer : D

48. If R is the reaction on the bearing plate, the minimum moment of. inertia of the bearing stiffener provided at the support of a plate girder of overall depth D, the maximum thickness of the compression flange T, carrying total load W, is
A. (D²/250) × (R/W)
B. (D³T/250) × (R/W)
C. (DT/250) × (R/W)
D. (DT/250) × (W/R)
Answer : B

49. A structural member subjected to tensile force in a direction parallel to its longitudinal axis, is generally known as
A. A tie
B. A tie member
C. A tension member
D. All the above
Answer : D

50. In a truss girder of a bridge, a diagonal consists of mild steel flat 4001.S.F. and carries a pull of 80 tonnes. If the gross-diameter of the rivet is 26 mm, the number of rivets required in the splice, is
A. 6
B. 7
C. 8
D. 9
Answer : C