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Design of Steel Structures Quiz | Design of Steel Structures MCQs and Answers

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81 The allowable shear stress in the web of mild steel beams decreases with where ‘h’ is height and t is thickness
[A] decrease in h/t ratio
[B] increase in h/t ratio
[C] decrease in thickness
[D] increase in height
Answer: increase in h/t ratio
82 In moment resistant connections, the moment resistance of riveted connection depends upon
[A] shear in rivets
[B] compression in rivets
[C] tension in rivets
[D] strength of rivets in bearing
Answer: tension in rivets
83 Pitch of tacking rivets, when double angles connected back to back and acting as tension members should not be more than
[A] 500 mm
[B] 600 mm
[C] 1000 mm
[D] 300 mm
Answer: 1000 mm
84 A steel beam supporting loads from the floor slab as well as from wall is termed as
[A] stringer beam
[B] lintel beam
[C] spandrel beam
[D] header beam
Answer: spandrel beam
85 For rivets in tension with counter-sunk heads, the tensile value shall be
[A] reduced by 25 %
[B] reduced by 33.3%
[C] increased by 25 %
[D] increased by 33.3 %
Answer: reduced by 33.3%
86 Lug angles
[A] are used to reduce the length of connection.
[B] are unequal angles.
[C] increases shear lag.
[D] all the above
Answer: are used to reduce the length of connection
87 The connection of intermediate vertical stiffeners to the web, not subjected to external loads, shall be designed for a minimum shear force (kN/m) of where, t = the web thickness in mm h = the outstand of stiffener in mm
[A] 75 t2/h
[B] 125 t3/h2
[C] 125 t2/h
[D] 175 t2/h
Answer: 125 t2/h
88 The moment of inertia of the pair of vertical stiffeners about the center line of the web should not be less than. where, ‘t’ is the minimum required thick-ness of the web and ‘C is the maximum permitted clear distance between vertical stiffener for thickness ‘t’.
[A] 1.5dV/C
[B] 1.5d¥/C
[C] 1.5d¥/C2
[D] 1.5dY/C3
Answer: 1.5d¥/C2
89 The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible for cleaning and repainting, should be:
[A] 4.5 mm
[B] 6 mm
[C] 8 mm
[D] 10 mm
Answer: 8 mm
90 In case of plastic design, the calculated maximum shear capacity of a beam as per IS:800 shall be where, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel
[A] 0.55 Awfy
[B] 0.65 Awfy
[C] 0.75 Awfy
[D] 0.85 Awfy
Answer: 0.55 Awfy
91 The shape factor of an isosceles triangle for bending about the axis parallel to the base is:
[A] 1.5
[B] 1.7
[C] 2.0
[D] 2.34
Answer: 2.34
92 In the virtual work method, the virtual quantity is
[A] displacement
[B] load
[C] slope
[D] moment
Answer: displacement
93 Which of the following conditions is to be satisfied both in elastic and plastic analysis ?
[A] equilibrium condition
[B] yield condition
[C] plastic moment condition
[D] mechanism condition
Answer: equilibrium condition
94 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] unpredictable
Answer: more than the load factor in determinate structures
95 The ratio of plastic section modulus to elastic section modulus
[A] is equal to 1
[B] is always less than 1
[C] is always greater than 1
[D] can be less than 1
Answer: is always greater than 1
96 Load factor is
[A] always equal to factor of safety
[B] always less than factor of safety
[C] always greater than factor of safety
[D] sometimes greater than factor of safety
Answer: always greater than factor of safety
97 The mechanism method of plastic analysis satisfies
[A] equilibrium and mechanism conditions
[B] equilibrium and plastic moment conditions
[C] mechanism and plastic moment conditions
[D] equilibrium condition only
Answer: equilibrium and mechanism conditions
98 The statical method of plastic analysis satisfies
[A] equilibrium and mechanism conditions
[B] equilibrium and plastic moment conditions
[C] mechanism and plastic moment conditions
[D] equilibrium condition only
Answer: equilibrium and plastic moment conditions
99 Shape factor is a property which depends
[A] only on the ultimate stress of the material
[B] only on the yield stress of the material
[C] only on the geometry of the section
[D] both on the yield stress and ultimate stress of material
Answer: only on the geometry of the section
100 The moment-curvature relation at a plastic hinge is
[A] linear
[B] parabolic
[C] constant moment for all curvatures
[D] constant curvature for all moments
Answer: constant moment for all curvatures
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