Hiried Design of Steel Structures Multiple choice Questions and Answers pdf

51.    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)

Ans: c

52.    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

Ans: a

53.    The maximum spacing of vertical stiffeners is
a)    1.33d
b)    1.25 d
c)    1.5 d
d)    1.75d
where d is the distance between flange angles

Ans: c

54.    The range of economical spacing of trusses varies from
a)    L/3 to L/5
b)    L/4to2L/5
c)    L/3 to L/2
d)    2L/5 to 3L/5 where L is span

Ans: a

55.    The maximum permissible span of asbestos cement sheets is
a)    650 mm
b)    810 mm
c)    1250 mm
d)    1680 mm

Ans: d

56.    Normally, the angle of roof truss with asbestos sheets should not be less than
a)    26'/2°
b)    30°
c)    35°
d)    40°

Ans: b

57.    To minimise 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

Ans: b

58.    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

Ans: d

59.    For the buildings having a low permeability, the internal wind pressure acting normal to the wall and roof surfaces is taken as
a)    zero
b)    ±0.2p
c)    ± 0.5 p
d)    ±0.7p
where p is basic wind pressure