Design of Steel Structures MCQ Solved Paper for SSC Scientific Assistant

1. Live load
A. Varies in magnitude
B. Varies in position
C. Is expressed as uniformly distributed load
D. All the above
Answer : D

2. 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

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

4. 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

5. The slenderness ratio of lacing bars should not exceed
A. 100
B. 120
C. 145
D. 180
Answer : C

6. The thickness of the web of a mild steel plate girder is less than d/200. If only one horizontal stiffener is used, it is placed at
A. The neutral axis of the section
B. 2/3rd of the depth of the neutral axis from the compression flange
C. 2/5th of the depth of the neutral axis from the compression flange
D. 2/5th of the height of the neutral axis from tension flange
Answer : C

7. 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

8. The permissible bearing stress in steel, is
A. 1500 kg/cm2
B. 1890 kg/cm2
C. 2025 kg/cm2
D. 2340 kg/cm2
Answer : B

9. 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

10. 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

11. Which of the following conditions is to be satisfied both in elastic and plastic analysis?
A. Equilibrium condition
B. Yield condition
C. Plastic moment condition
D. Mechanism condition
Answer : A

12. A butt weld is specified by
A. Effective throat thickness
B. Plate thickness
C. Size of weld
D. Penetration thickness
Answer : A

13. The effective length L of a simply supported beam with ends restrained against torsion, and also the ends of compression flange partially restrained against lateral bending, is given by
A. L = span
B. L = 0.85 span
C. L = 0.75 span
D. L = 0.7 span
Answer : B

14. 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 : C

15. 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

16. If p and d are pitch and gross diameter of rivets, the efficiency (?) of the riveted joint, is given by
A. ? = p/p - d
B. ? = p/p + d
C. ? = p - d/p
D. ? = p + d/p
Answer : C

17. The statical 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 : B

18. Minimum spacing of vertical stiffeners is limited to
A. d/4
B. d/3
C. d/2
D. 2d/3 Where d is the distance between flange angles
Answer : B

19. 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

20. 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

21. 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

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

23. The bracing between two columns of a steel tank will be designed to resist
A. Horizontal shear due to wind or earthquake only
B. Horizontal, shear due to wind or earthquake + 2.5% of column loads
C. Column loads + 2.5% of horizontal shear due to wind or earthquake
D. Column loads + full horizontal shear due to wind or earthquake
Answer : B

24. Rolled steel beams are designated by Indian Standard series and its
A. Weight per metre and depth of its section
B. Depth of section and weight per metre
C. Width of flange and weight per metre
D. Weight per metre and flange width
Answer : B

25. The ratio of shearing stress to shearing strain within elastic limit, is known as
A. Modulus of elasticity
B. Shear modulus of elasticity
C. Bulk modulus of elasticity
D. Tangent modulus of elasticity
Answer : B

26. The main type of butt joints, is a double cover
A. Shear riveted joint
B. Chain riveted joint
C. Zig-zag riveted joint
D. All the above
Answer : D

27. The basic wind speed is specified at a height 'h' above mean ground level in an open terrain. The value of 'h' is
A. 10 m
B. 20 m
C. 25 m
D. 50 m
Answer : A

28. Design of a riveted joint is based on the assumption:
A. Bending stress in rivets is accounted for
B. Riveted hole is assumed to be completely filled by the rivet
C. Stress in the plate in not uniform
D. Friction between plates is taken into account
Answer : B

29. Rise of a Jack arch is kept about
A. 1/2 to 1/3 of the span
B. 1/3 to 1/4 of the span
C. 1/4 to 1/8 of the span
D. 1/8 to 1/12 of the span
Answer : D

30. The minimum edge distance of a rivet line connecting two or more plates, is kept equal to 37 mm plus (where t is the thickness in mm of the thinner outside plate).
A. 2 t
B. 4 t
C. 6 t
D. 8 t
Answer : B

31. 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

32. 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

33. When a tension member is made of four angles with a plate as a web, the allowance for holes is made as
A. Two holes for each angle and one hole for the web
B. One hole for each angle and one hole for the web
C. One hole for each angle and two holes for the web
D. Two holes for each angle and two holes for the web
Answer : C

34. 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

35. A fillet weld whose axis is parallel to the direction of the applied load, is known as
A. Diagonal filler weld
B. End fillet weld
C. Side fillet weld
D. All the above
Answer : C

36. 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

37. In plastic analysis, the shape factor for circular sections, is
A. 1.5
B. 1.6
C. 1.697
D. None of these
Answer : C

38. If d is the distance between the flange angles of a plate girder, vertical stiffeners are provided at a distance not greater than
A. d but not less than 0.20 d
B. 1.25 d but not less than 0.33 d
C. 1.5 d but not less than 0.33 d
D. 2.0 d but not less than 0.50 d
Answer : B

39. In a built up beam actual bending compressive stress f_bc is given by (when y₁ is the distance of the edge of the beam from the neutral axis).
A. f_bc = (M/I_xx) × y?
B. f_bc = (I_xx/M) × y?
C. f_bc = (I_xx/M) + y?
D. f_bc = (M/I_xx) + y?
Answer : A

40. A major beam in a building structure, is known as
A. A girder
B. A floor beam
C. A main beam
D. All the above
Answer : D

41. 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

42. 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 : B

43. As compared to field rivets, the shop rivets are
A. Stronger
B. Weaker
C. Equally strong
D. Any of the above
Answer : A

44. 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

45. 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

46. The deflection of beams may be decreased by
A. Increasing the depth of beam
B. Increasing the span
C. Decreasing the depth of beam
D. Increasing the width of beam
Answer : A

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 : A

48. 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

49. The distance between the outer faces of flanges of a plate girder, is known as
A. Overall depth
B. Clear depth
C. Effective depth
D. None of these
Answer : A

50. For the steel member exposed to weather and accessible for repainting, the thickness of steel should not be less than (accepting the webs of Indian Standard rolled steel joists and channels).
A. 4 mm
B. 6 mm
C. 8 mm
D. 10 mm
Answer : B