LIC ADO - Design of Steel Structures 1000+ MCQ [Solved] PDF Download

1. The slenderness ratio of a column supported throughout its length by a masonry wall is
A. Zero
B. 10
C. 100
D. Infinity
Answer : A

2. 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

3. 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 : A

4. If W and L are the total superimposed load and the span of a plate girder in metres, the approximate self weight (W) of the girder, is taken as
A. M = WL/100
B. M = WL/200
C. M = WL/300
D. M = WL/400
Answer : C

5. The effective length of a compression member of length L held in position at both ends but not restrained in direction, is
A. L
B. 0.67 L
C. 0.85 L
D. 1.5 L
Answer : A

6. Economical depth of a plate girder corresponds to
A. Minimum weight
B. Minimum depth
C. Maximum weight
D. Minimum thickness of web
Answer : A

7. 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 : A

8. Pick up the correct statement from the following:
A. The steel beams placed in plain cement concrete, are known as reinforced beams
B. The filler joists are generally continuous over three-supports only
C. Continuous fillers are connected to main beams by means of cleat angles
D. Continuous fillers are supported by main steel beams
Answer : D

9. A web plate is called unstiffened if the ratio of clear depth to thickness is less than
A. 35
B. 50
C. 65
D. 85
Answer : D

10. The diameter of a bolt hole is taken as the nominal diameter of the bolt plus
A. 1.0 mm
B. 1.2 mm
C. 1.4 mm
D. 1.6 mm
Answer : D

11. 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

12. 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 : B

13. The distance between e.g. of compression and e.g. of tension flanges of a plate girder, is known as
A. Overall depth
B. Clear depth
C. Effective depth
D. None of these
Answer : C

14. 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

15. Horizontal stiffener in a plate girder is provided to safeguard against
A. Shear buckling of web plate
B. Compression buckling of web plate
C. Yielding
D. All of the above
Answer : B

16. 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

17. Minimum pitch of the rivets shall not be less than
A. 1.5 d
B. 2.0 d
C. 2.5 d
D. 3.0 d Where d is gross diameter of rivet
Answer : C

18. The equivalent axial load may be defined as the load which produces a stress equal to
A. Maximum stress produced by the eccentric load
B. Maximum stressed fibre
C. Bending stress
D. None of these
Answer : A

19. 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

20. Tacking rivets in compression plates not exposed to the weather, have a pitch not exceeding 300 mm or
A. 16 times the thickness of outside plate
B. 24 times the thickness of outside plate
C. 32 times the thickness of outside plate
D. 36 times the thickness of outside plate
Answer : C

21. 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

22. Diameter of a rivet hole is made larger than the diameter of the rivet by
A. 1.0 mm for rivet diameter upto 12 mm
B. 1.5 mm for rivet diameter exceeding 25 mm
C. 2.0 mm for rivet diameter over 25 mm
D. None of these
Answer : C

23. 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

24. 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

25. In the virtual work method, the virtual quantity is
A. Displacement
B. Load
C. Slope
D. Moment
Answer : A

26. Lug angle is
A. Used with single angle member
B. Not used with double angle member
C. Used with channel member
D. All the above
Answer : D

27. Number of rivets required in a joint, is
A. Load/Shear strength of a rivet
B. Load/Bearing strength of a rivet
C. Load/Tearing strength of a rivet
D. Load/Rivet value
Answer : D

28. The risk coefficient k, depends on
A. Mean probable design life of structures
B. Basic wind speed
C. Both (A) and (B)
D. None of the above
Answer : C

29. On eccentrically loaded columns, the equivalent axial load may be obtained by
A. Adding the axial load, eccentric load, the product of the bending moment due to eccentric load and the appropriate bending factor
B. Adding the axial load and eccentric load and subtracting the product of bending moment and appropriate bending factor
C. Dividing the sum of axial load and eccentric load by the product of the bending moment and appropriate bending factor
D. None of these
Answer : A

30. The beam outside a wall upto floor level above it, is known as
A. Rafter
B. Purlin
C. Spandrel beam
D. Lintel
Answer : C

31. 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

32. Assuming the values of maximum deviation ?P and ?E to be 25% of the computed value of P and E respectively, the minimum value of the factor of safety is
A. 1.00
B. 0.67
C. 1.67
D. 2.67
Answer : C

33. 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 : C

34. The capacity of the smallest pressed steel tank is
A. 1000 litre
B. 1650 litre
C. 1950 litre
D. 2450 litre
Answer : C

35. A tension member, if subjected to possible reversal of stress due to wind, the slenderness ratio of the member should not exceed
A. 180
B. 200
C. 300
D. 350
Answer : D

36. The beams supporting the steps of a stair are generally known as
A. Headers
B. Trimmers
C. Stringers
D. Spandrel beams
Answer : C

37. 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

38. 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

39. 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

40. The least permissible clear dimension of the web of thickness t in the panel of a plate girder, is restricted to
A. 150 t
B. 160 t
C. 170 t
D. 180 t
Answer : D

41. Efficiency of a riveted joint is defined as the ratio of
A. Least strength of a riveted joint to the strength of solid plate
B. Greatest strength of a riveted joint to the strength of solid plate
C. Least strength of a riveted plate to the greatest strength of the riveted joint
D. All the above
Answer : D

42. As per IS: 800, in the plastic design, which of the following pairs are correctly matched?
Working Loads Load factor
(i) Dead load 1.7
(ii) Dead Load + imposed load 1.7
(iii) Dead load + load due to wind or 1.3 seismic forces
(iv) Dead load + imposed load + load 1.7 due to wind or seismic forces
Of these statements
A. (i) and (ii) are correct
B. (i), (ii) and (iii) are correct
C. (ii) and (iii) are correct
D. Only (i) is correct
Answer : A

43. 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

44. 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

45. 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

46. The load on a lintel is assumed as uniformly distributed if the height of the masonry above it, is upto a height of
A. The effective span
B. 1.25 times the effective span
C. 1.50 times the effective span
D. 2.0 times the effective span
Answer : B

47. Maximum permissible slenderness ratio of a member normally acting as a tie in a roof truss, is
A. 180
B. 200
C. 250
D. 350
Answer : D

48. The allowable stress in axial tension for rolled I-sections and channels, is taken as
A. 1420 kg/cm²
B. 1500 kg/cm²
C. 2125 kg/cm²
D. 1810 kg/cm²
Answer : B

49. If d is the distance between the flange angles,
A. Vertical stiffeners are provided in steel plate girders if the web is less than d/85
B. Vertical stiffeners are provided in high tensile steel plate girders if the web is less than d/175
C. Horizontal stiffeners are provided in steel plate girders if the web is less than d/200
D. All the above
Answer : D

50. 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