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Design of Steel Structures - Interview Questions and Answers

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71. Generally the purlins are placed at the panel points so as to avoid
A. axial force in rafter
B. shear force in rafter
C. deflection of rafter
D. bending moment in rafter
Explanation:
72. 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
Explanation:
73. The live load for a sloping roof with slope 15�, where access is not provided to roof, is taken as
A. 0.65 kN/m2
B. 0.75 kN/m2
C. 1.35 kN/m2
D. 1.50 kN/m2
Explanation:
74. The maximum spacing of vertical stiffeners is
A. 1.33d
B. 1.25 d
C. 1.5 d
D. 1.75d
Explanation:
75. 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
Explanation: