Design of Steel Structures Quiz | Design of Steel Structures Multiple Choice Questions with Answers

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Questions
61 The centrifugal force due to curvature of track is assumed to act on the bridge at a height of
A 1.23 m above the rail level
B 1.50 m above the rail level
C 1.83 m above the rail level
D 2.13 m above the rail level

Answer: 1.83 m above the rail level
62 If the floor is supported at or near the bottom but top chords of a bridge are not braced, then the bridge is called
A deck type
B through type
C half through type
D double deck type

Answer: half through type
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63 If the loaded length of span in meters of a railway steel bridge carrying a single track is 6 m, then impact factor is taken as
A 0
B 0.5
C between 0.5 and 1.0
D 1.0

Answer: between 0.5 and 1.0
64 Hudson’s formula gives the dead weight of a truss bridge as a function of
A bottom chord area
B top chord area
C effective span of bridge
D heaviest axle load of engine

Answer: bottom chord area
65 The diameter of base of conical flare of a steel stack is where d is the diameter of the cylindrical part
A less than d
B equal to d
C more than d
D any of the above

Answer: more than d
66 The minimum thickness of plates in a steel stack should be
A 4 mm
B 5 mm
C 6 mm
D 8 mm

Answer: 6 mm
67 The bracing between two columns of a steel tank will be designed to resist
A horizontal shear due to wind or earthquake only
B horizontal, shear due to wind or earthquake + 2.5% of column loads
C column loads + 2.5% of horizontal shear due to wind or earthquake
D column loads + full horizontal shear due to wind or earthquake

Answer: horizontal, shear due to wind or earthquake + 2.5% of column loads
68 The capacity of the smallest pressed steel tank is
A 1000 litre
B 1650 litre
C 1950 litre
D 2450 litre

Answer: 1950 litre
69 Which of the following sections should preferably be used at places where torsion occurs ?
A angle section
B channel section
C box type section
D any of the above

Answer: box type section
70 Steel tanks are mainly designed for
A weight of tank
B wind pressure
C water pressure
D earthquake forces

Answer: water pressure
71 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: 105.5 MPa on net area
72 Minimum pitch provided in riveted steel tanks is where d is diameter of rivets
A 1.5 d
B 2.0 d
C 2.5 d
D 3.0 d

Answer: 3.0 d
73 The number of seismic zones in which the country has been divided are
A 3
B 5
C 6
D 7

Answer: 5
74 As per IS : 875, for the purposes of specifying basic wind velocity, the country has been divided into
A 4 zones
B 5 zones
C 6 zones
D 7 zones

Answer: 6 zones
75 Area of openings for buildings of large permeability is more than
A 10% of wall area
B 20% of wall area
C 30% of wall area
D 50% of wall area

Answer: 20% of wall area
76 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

Answer: slope of roof
77 The risk coefficient k, depends on
A mean probable design life of structures
B basic wind speed
C both (a) and (b)
D none of the above

Answer: both (a) and (b)
78 The basic wind speed is specified at a height ‘h’ above mean ground level in an open terrain. The value of’h’ is
A 10 m
B 20 m
C 25 m
D 50 m

Answer: 10 m
79 The portal bracing in a truss bridge is used to
A transfer load from top of end posts to bearings
B keep the rectangular shape of the bridge cross-section
C stiffen the structure laterally
D prevent the sidesway buckling of top chord

Answer: transfer load from top of end posts to bearings
80 The sway bracing is designed to transfer
A 2Vi % of the top panel wind load to bottom bracing
B 10% of the top panel wind load to bottom bracing
C 25% of the top panel wind load to bottom bracing
D 50% of the top panel wind load to bottom bracing

Answer: 50% of the top panel wind load to bottom bracing
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