1000+ Design of Steel Structures MCQ for SSC CPO [Solved]

1. The bending moment for filler joists at the middle of an intermediate span, is
A. WL²/10
B. - WL²/10
C. - WL²/12
D. WL²/12
Answer : D

2. 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

3. 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

4. The least dimension in case of a circular column of diameter D is taken as
A. 0.5 D
B. 0.68 D
C. 0.88 D
D. D
Answer : C

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

6. 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

7. A simply supported beam carrying a central load, will be safe in deflection if the ratio of its span to depth, is
A. < 19
B. < 24
C. > 19
D. > 24
Answer : B

8. The moment of the couple set up in a section of a beam by the longitudinal compressive and tensile force, is known as
A. Bending moment
B. Moment of resistance
C. Flexural stress moment
D. None of these
Answer : B

9. 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

10. IS : 800 - 1971 recommends that in a splice plate the number of rivets carrying calculated shear stress through a packing greater than 6 mm thick, is to be increased by 2.5% for every
A. 1.00 mm thickness of packing
B. 1.50 mm thickness of packing
C. 2.0 mm thickness of packing
D. 2.50 mm thickness of packing
Answer : C

11. 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

12. Under a concentrated load, bearing stress f_b in a beam is given by (where b is the length of the bearing plate and h is the depth of the root of the fillet).
A. f_b = W/(b + h?3)t_w
B. f_b = W/(b + 2h?3)t_w
C. f_b = W/(b + 2h?2)t_w
D. f_b = W/(b + h?2)t_w
Answer : B

13. Allowable working stress corresponding to the slenderness ratio of double angles placed back to back and connected to one side of a gusset plate, is reduced to
A. 50 %
B. 60 %
C. 70 %
D. 80 %
Answer : D

14. Perforated cover plates are particularly suitable for built up sections consisting of
A. Channels placed back to back
B. Channels placed toe to toe
C. Four angle box section
D. All the above
Answer : C

15. The number of seismic zones in which the country has been divided is
A. 3
B. 5
C. 6
D. 7
Answer : B

16. When the length of a tension member is too long
A. A wire rope is used
B. A rod is used
C. A bar is used
D. A single angle is used
Answer : C

17. 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

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

19. 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

20. Bearing stiffeners are provided at (i) The supports (ii) The mid span (iii) The point of application of concentrated loads The correct answer is
A. Only (i)
B. Both (i) and (ii)
C. Both (i) and (iii)
D. (i), (ii) and (iii)
Answer : C

21. For determination of allowable stress in axial compression, Indian Standard Institution has adopted
A. Euler's formula
B. Rankine formula
C. Perry Robertson formula
D. Secant formula
Answer : D

23. 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

24. 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

25. If L is the overall length of a combined footing having A as its area, d being the distance between the centre of gravity of the base and centre of the base, the larger width b is
A. (A/L) + (3Ad/L²)
B. (A/L) + (6Ad/L²)
C. (A/L) - (6Ad/L²)
D. (A/L) - (3Ad/L²)
Answer : B

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

27. The maximum permissible span of asbestos cement sheets is
A. 650 mm
B. 810 mm
C. 1250 mm
D. 1680 mm
Answer : D

28. 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

29. If the area of cross-section of a single angle discontinuous strut is 30 cm2 and allowable working stress corresponding to its slenderness ratio is 625 kg/cm², the safe load carrying capacity of the member, is
A. 10 tonnes
B. 12 tonnes
C. 15 tonnes
D. 18 tonnes
Answer : C

30. When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which (Where, Fa is the load shared by each rivet due to axial load and Fm is the shearing load due to moment in any rivet.)
A. Is at the maximum distance from CG of the rivet group
B. Is at the minimum distance from CG of the rivet group
C. Gives the maximum angle between the two forces Fa and Fm
D. Gives the minimum angle between the two forces Fa and Fm
Answer : D

31. 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

32. 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

33. If the pitch is 6 cm and rivet value is 4 tonnes, the number of rivets required for a riveted connection carrying an eccentric load of 15 tonnes at a distance of 30 cm from the centre line, is
A. 6
B. 8
C. 10
D. 15
Answer : B

34. Rolled steel angle sections are classified as
A. Equal angles
B. Unequal angles
C. Bulb angles
D. All the above
Answer : D

35. 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

36. Poisson's ratio for steel within elastic limit, ranges from
A. 0.15 to 0.20
B. 0.25 to 0.24
C. 0.25 to 0.33
D. 0.33 to 0.35
Answer : C

37. 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

38. In case of timber structures, the form factor for solid circular crosssection is taken as
A. 1.18
B. 1.414
C. 1.67
D. 1.81
Answer : A

39. The channels get twisted symmetrically with regard to its axis
A. Parallel to flanges
B. Parallel to web
C. Perpendicular to flanges
D. Perpendicular to web
Answer : B

40. If the depth of the section of an upper column is smaller than the lower column
A. Filler plates are provided with column splice
B. Bearing plates are provided with column splice
C. Filler plates and bearing plates are provided with column splice
D. None of these
Answer : D

41. 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

42. For a standard 45° fillet, the ratio of size of fillet tothroat thickness is
A. 1 : 1
B. 1 : ?2
C. ?2 : 1
D. 2 : 1
Answer : C

43. 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

44. Long column is one
A. Which is more than 3 m long
B. Whose lateral dimension is less than 25 cm
C. Which is free at its top
D. Which has a ratio of effective length and least lateral dimension more than 15
Answer : D

45. The spans are considered approximately equal if the longest span does not exceed the shortest span by more than
A. 5 %
B. 10 %
C. 15 %
D. 20 %
Answer : C

46. For a steel grillage footing to support two unequal column loads
A. Line of action of the resultant of two column loads, is made to coincide with the centre of gravity of the base of the footing
B. Trapezoidal shape is used for the base footing
C. Projections of beams on either side in lower tier are such that bending moments under columns are equal
D. All the above
Answer : D

47. 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

48. 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

49. The rivets which are heated and then driven in the field, are known
A. Power driven shop rivets
B. Power driven field rivets
C. Hand driven rivets
D. Cold driven rivets
Answer : B

50. When the ratio of the moment M to axial load P is greater than L/6, the resultant of the compressive bearing pressure which acts at a distance Y from one side, is given by
A. y = (L/3) - (M/P)
B. y = (L/2) - (P/M)
C. y = (L/2) + (M/P)
D. y = (L/3) + (M/P)
Answer : B