Design of Steel Structures 1000+ MCQ with answer for CTET

1. 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

2. If f_bt and f_c are the co-existent bending tensile stress and shear stress in a member, the equivalent stress f_c is
A. ?(f_bt² + f_c²)
B. ?(f_bt² + ½f_c²)
C. ?(f_bt² + 3f_c²)
D. ?(f_bt² - 3f_c²)
Answer : C

3. The allowable stress in axial tension is generally kept less if thickness of the member is more than
A. 10 mm
B. 12 mm
C. 15 mm
D. 20 mm
Answer : D

4. In rolled steel beams, shear force is mostly resisted by
A. Web only
B. Flanges only
C. Web and flanges together
D. None of these
Answer : A

5. The net area of round bars to resist the tension, is the area of cross section at
A. Mid-section
B. Root of the thread
C. Difference of (a) and (b)
D. None of these
Answer : B

6. 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

7. 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

8. If the unsupported length of a stanchion is 4 metres and least radius of gyration of its cross-section is 5, the slenderness ratio of the stanchion, is
A. 60
B. 70
C. 80
D. 100
Answer : C

9. 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, if n is
A. 2
B. 4
C. 6
D. 8
Answer : D

10. 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

11. 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

12. 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

13. 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

14. If the moment of inertia of a section about its axis is I and its effective sectional area is A, its radius of gyration r about the axis, is
A. r = I/A
B. r = ?(I/A)
C. r = ?(I/A)
D. r = ?(A/I)
Answer : B

15. Outstanding length of a compression member consisting of a channel, is measured as
A. Half of the nominal width
B. Nominal width of the section
C. From the edge to the first row of rivets
D. None of these
Answer : B

16. Rolled steel beams are:
A. Mainly used to resist bending stress
B. Used as independent sections to resist compressive stress
C. Used as independent sections to resist tensile stress
D. All the above
Answer : D

17. 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

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. When a large value of radius of gyration is not required
A. Channels are placed back to back
B. Channel flanges are kept inward
C. Channel flanges are kept outward
D. None of these
Answer : B

20. The minimum width B of a solid casing for a cased beam, is equal to
A. B = b + 25 mm
B. B = b + 50 mm
C. B = b + 75 mm
D. B = b + 100 mm
Answer : D

21. The least permissible clear dimension of the web of thicknes 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

22. 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

23. 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

24. A column splice is used to increase
A. Length of the column
B. Strength of the column
C. Cross-sectional area of the column
D. None of these
Answer : A

25. 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

26. Spans of continuous fillers 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

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. Gantry girders are designed to resist
A. Lateral loads
B. Longitudinal loads and vertical loads
C. Lateral, longitudinal and vertical loads
D. Lateral and longitudinal loads
Answer : C

29. 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

30. 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

31. 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

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

33. The maximum permissible slenderness ratio of a member carrying loads resulting from wind, is
A. 180
B. 200
C. 250
D. 300
Answer : C

34. The allowable tensile stress in structural mild steel plates for steel tank is assumed as
A. 95.0 MPa on net area
B. 105.5 MPa on net area
C. 105.5 MPa on gross area
D. 150.0 MPa on gross area
Answer : B

35. 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

36. The gross diameter of a rivet is the diameter of
A. Cold rivet before driving
B. Rivet after driving
C. Rivet hole
D. None of these
Answer : B

37. 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

38. The allowable shear stress in the web of mild steel beams decreases with
A. Decrease in h/t ratio
B. Increase in h/t ratio
C. Decrease in thickness
D. Increase in height Where 'h' is height and t is thickness
Answer : B

39. 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

40. The effective length of a weld, is taken as the actual length
A. Minus the size of weld
B. Minus twice the size of weld
C. Plus the size of weld
D. Plus twice the size of weld
Answer : B

41. The slenderness ratio of a column is zero when its length
A. Is zero
B. Is equal to its radius of gyration
C. Is supported on all sides throughout its length
D. Is between the points of zero moments
Answer : D

42. 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

43. Other conditions being same, the load factor in indeterminate structures is
A. Equal to load factor in determinate structures
B. More than the load factor in determinate structures
C. Less than the load factor in determinate structures
D. Unprdictable
Answer : B

44. 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

45. Effective length of a column effectively 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

46. Maximum pitch of rivets, used in steel stacks, is limited to
A. 6 t
B. 10 t
C. 12 t
D. 16 t Where t is thickness of thinner plate being connected
Answer : B

47. 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

48. 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

49. A riveted joint many experience
A. Tearing failure of plates
B. Splitting failure of plates at the edges
C. Bearing failure of rivets
D. All the above
Answer : D

50. On steel structures the dead load is the weight of
A. Steel work
B. Material fastened to steel work
C. Material supported permanently
D. All the above
Answer : D