Design of Steel Structures Objective Questions and Answers - Set 21 - ObjectiveBooks

Design of Steel Structures Objective Questions and Answers - Set 21

Practice Test: Question Set - 21

1. The equivalent axial tensile load Pe, which produces an average axial tensile stress in the section equivalent to the combined stress due to axial tension P and bending M, at the extreme fibre of the section, is given by (where Z is the section modulus of the section).
    (A) Pe = P + MA/Z
    (B) Pe = P - MA/Z
    (C) Pe = P - Z/MA
    (D) Pe = P + Z/MA

2. A 20 mm dia steel bar which is subjected to an axial tension of 2300 kg/cm2 produces a strain of 0.004 cm. If Young's modulus of steel is 2.1 × 106 kg/cm2, the bar is
    (A) In the elastic range
    (B) In the plastic range
    (C) At yield point
    (D) None of these

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

4. The average shear stress for rolled steel beam section, is
    (A) 845 kg/cm2
    (B) 945 kg/cm2
    (C) 1025 kg/cm2
    (D) 1500 kg/cm2

5. 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

6. 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

7. The permissible stress in bending for rolled steel I-beams and channels, is
    (A) 1500 kg/cm2
    (B) 1575 kg/cm2
    (C) 945 kg/cm2
    (D) 1650 kg/cm2

8. 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

9. 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

10. The permissible bearing stress in steel, is
    (A) 1500 kg/cm2
    (B) 1890 kg/cm2
    (C) 2025 kg/cm2
    (D) 2340 kg/cm2

11. 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

12. 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

13. 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

14. 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)

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

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