Design of Steel Structures MCQ

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• A steel beam supporting loads from the floor slab as well as from wall is termed as
  ক

  Stringer beam

  খ

  Lintel beam

  গ

  Spandrel beam

  ঘ

  Header beam
• The range of economical spacing of trusses varies from
  ক

  $$\frac{{\text{L}}}{3}$$ to $$\frac{{\text{L}}}{5}$$

  খ

  $$\frac{{\text{L}}}{4}$$ to $$\frac{{2{\text{L}}}}{5}$$

  গ

  $$\frac{{\text{L}}}{3}$$ to $$\frac{{\text{L}}}{2}$$

  ঘ

  $$\frac{{2{\text{L}}}}{5}$$ to $$\frac{{3{\text{L}}}}{5}$$ where L is span
• The capacity of the smallest pressed steel tank is
  ক

  1000 litre

  খ

  1650 litre

  গ

  1950 litre

  ঘ

  2450 litre
• Horizontal stiffener in a plate girder is provided to safeguard against
  ক

  Shear buckling of web plate

  খ

  Compression buckling of web plate

  গ

  Yielding

  ঘ

  All of the above
• If the thickness of plate to be connected by a rivet is 16 mm, then suitable size of rivet as per Unwin’s formula will be
  ক

  16 mm

  খ

  20 mm

  গ

  24 mm

  ঘ

  27 mm
• Shape factor is a property which depends
  ক

  Only on the ultimate stress of the material

  খ

  Only on the yield stress of the material

  গ

  Only on the geometry of the section

  ঘ

  Both on the yield stress and ultimate stress of material
• In the virtual work method, the virtual quantity is
  ক

  Displacement

  খ

  Load

  গ

  Slope

  ঘ

  Moment
• The live load for a sloping roof with slope 15°, where access is not provided to roof, is taken as
  ক

  0.65 kN/m²

  খ

  0.75 kN/m²

  গ

  1.35 kN/m²

  ঘ

  1.50 kN/m²
• For a standard 45° fillet, the ratio of size of fillet to throat thickness is
  ক

  1 : 1

  খ

  $$1:\sqrt 2 $$

  গ

  $$\sqrt 2 :1$$

  ঘ

  2 : 1
• Shear buckling of web in a plate girder is prevented by using
  ক

  Vertical intermediate stiffener

  খ

  Horizontal stiffener at neutral axis

  গ

  Bearing stiffener

  ঘ

  None of the above
• In a gusseted base, when the end of the column is machined for complete bearing on the base plate, then the axial load is assumed to be transferred to base plate
  ক

  Fully by direct bearing

  খ

  Fully through fastenings

  গ

  50% by direct bearing and 50% through fastenings

  ঘ

  75% by direct bearing and 25% through fastenings
• The elastic strain for steel is about
  ক

  $$\frac{1}{{12}}$$ of strain at the initiation of strain hardening and about $$\frac{1}{{120}}$$  of maximum strain

  খ

  $$\frac{1}{2}$$ of strain at the initiation of strain hardening and about $$\frac{1}{{12}}$$ of maximum strain

  গ

  $$\frac{1}{{12}}$$ of strain at the initiation of strain hardening and $$\frac{1}{{200}}$$  of maximum strain

  ঘ

  $$\frac{1}{{24}}$$ of strain at the initiation of strain hardening and about $$\frac{1}{{200}}$$  of maximum strain
• The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible for cleaning and repainting, should be:
  ক

  4.5 mm

  খ

  6 mm

  গ

  8 mm

  ঘ

  10 mm
• When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which (where, Fa is the load shared by each rivet due to axial load and Fm is the shearing load due to moment in any rivet.)
  ক

  Is at the maximum distance from CG of the rivet group

  খ

  Is at the minimum distance from CG of the rivet group

  গ

  Gives the maximum angle between the two forces Fa and Fm

  ঘ

  Gives the minimum angle between the two forces Fa and Fm
• The mechanism method of plastic analysis satisfies
  ক

  Equilibrium and mechanism conditions

  খ

  Equilibrium and plastic moment conditions

  গ

  Mechanism and plastic moment conditions

  ঘ

  Equilibrium condition only
• The statical method of plastic analysis satisfies
  ক

  Equilibrium and mechanism conditions

  খ

  Equilibrium and plastic moment conditions

  গ

  Mechanism and plastic moment conditions

  ঘ

  Equilibrium condition only
• The effective length of a battened column is increased by
  ক

  5%

  খ

  10%

  গ

  15%

  ঘ

  20%
• Lug angles . . . . . . . .
  ক

  Are used to reduce the length of connection

  খ

  Are unequal angles

  গ

  Increases shear lag

  ঘ

  All options are correct
• Load factor is
  ক

  Always equal to factor of safety

  খ

  Always less than factor of safety

  গ

  Always greater than factor of safety

  ঘ

  Sometimes greater than factor of safety
• Area of openings for buildings of large permeability is more than
  ক

  10% of wall area

  খ

  20% of wall area

  গ

  30% of wall area

  ঘ

  50% of wall area
• For rivets in tension with counter-sunk heads, the tensile value shall be
  ক

  Reduced by 25%

  খ

  Reduced by 33.3%

  গ

  Increased by 25%

  ঘ

  Increased by 33.3%
• In the cross-section of a weld, throat is the
  ক

  Minimum dimension

  খ

  Average dimension

  গ

  Maximum dimension

  ঘ

  None of the above
• Bending compressive and tensile stresses respectively are calculated based on
  ক

  Net area and gross area

  খ

  Gross area and net area

  গ

  Net area in both cases

  ঘ

  Gross area in both cases
• Which of the following conditions is to be satisfied both in elastic and plastic analysis?
  ক

  Equilibrium condition

  খ

  Yield condition

  গ

  Plastic moment condition

  ঘ

  Mechanism condition
• The shape factor of an isosceles triangle for bending about the axis parallel to the base is:
  ক

  1.5

  খ

  1.7

  গ

  2.0

  ঘ

  2.34
• The minimum thickness of plates in a steel stack should be
  ক

  4 mm

  খ

  5 mm

  গ

  6 mm

  ঘ

  8 mm
• Steel tanks are mainly designed for
  ক

  Weight of tank

  খ

  Wind pressure

  গ

  Water pressure

  ঘ

  Earthquake forces
• If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be
  ক

  40 mm

  খ

  60 mm

  গ

  80 mm

  ঘ

  100 mm
• The relation between intensity of wind pressure P and velocity of wind V is taken as
  ক

  $${\text{P}} \propto {\text{V}}$$

  খ

  $${\text{P}} \propto {{\text{V}}^2}$$

  গ

  $${\text{P}} \propto \frac{1}{{\text{V}}}$$

  ঘ

  $${\text{P}} \propto {{\text{V}}^{\frac{1}{2}}}$$
• The internal pressure coefficient on walls for buildings with large permeability is taken as
  ক

  ±0.2

  খ

  ±0.5

  গ

  ±0.7

  ঘ

  0