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This set of Design of Steel Structures Multiple Choice Questions & Answers (MCQs) focuses on Design Of Steel Structures Set 12
Q1 | If L is the overall length of a combined footing having A as its area, d being the distance betweenthe centre of gravity of the base and centre of the base, the larger width b is
- (a/l) + (3ad/l²)
- (a/l) + (6ad/l²)
- (a/l) - (6ad/l²)
- (a/l) - (3ad/l²)
Q2 | Select the correct statement
- Material cost of a rivet is higher than that of abolt
- Tensile strength of a bolt is lesser than that of a rivet
- Bolts are used as a temporary fastening whereas rivets are used as permanentfastenings
- Riveting is less noisy than bolting
Q3 | 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
- Fully by direct bearing
- Fully through fastenings
- 50% by direct bearing and 50% through fastenings
- 75% by direct bearing and 25% through fastenings
Q4 | If the floor is supported at or near the bottom but top chords of a bridge is notbraced, then the bridge is called
- Deck type
- Through type
- Half through type
- Double deck type
Q5 | The elastic strain for steel is about
- 1/12 of strain at the initiation of strain hardening and about 1/120 of maximum strain
- 1/2 of strain at the initiation of strain hardening and about 1/12 of maximum strain
- 1/12 of strain at the initiation of strain hardening and 1/200 of maximumstrain
- 1/24 of strain at the initiation of strain hardening and about 1/200 of maximum strain
Q6 | In moment resistant connections, the moment resistance of riveted connectiondepends upon
- Shear in rivets
- Compression in rivets
- Tension in rivets
- Strength of rivets in bearing
Q7 | The moment of the couple set up in a section of a beam by the longitudinalcompressive and tensile force, is known as
- Bending moment
- Moment of resistance
- Flexural stress moment
- None of these
Q8 | The thickness of the web of a mild steel plate girder is less than d/200. If only one horizontal stiffener is used, it is placed at
- The neutral axis of the section
- 2/3rd of the depth of the neutral axis from the compressionflange
- 2/5th of the depth of the neutral axis from the compressionflange
- 2/5th of the height of the neutral axis from tensionflange
Q9 | The most commonly used sections in lateral system to carry shear force in built upcolumns, are
- Rolled steel flats
- Rolled angles
- Rolled channels
- All the above
Q10 | The bracing between two columns of a steel tank will be designed to resist
- Horizontal shear due to wind or earthquake only
- Horizontal, shear due to wind or earthquake + 2.5% of column loads
- Column loads + 2.5% of horizontal shear due to wind or earthquake
- Column loads + full horizontal shear due to wind orearthquake
Q11 | A beam may be designed as a cased beam if
- Section is of double open channel form with the webs not less than 40 mmapart
- Overall depth and width of the steel section do not exceed 750 and 450 mmrespectively
- Beam is solidly encased in concrete with 10 mm aggregate having 28 days strength 160kg/cm2
- All the above
Q12 | In a built up beam actual bending compressive stress fbc is given by (when y1 isthe distance of the edge of the beam from the neutral axis).
- fbc = (M/Ixx) × y
- fbc = (Ixx/M) × y
- fbc = (Ixx/M) + y
- fbc = (M/Ixx) + y
Q13 | If the thickness of a structural member is small as compared to its length andwidth, it is classified as
- One dimensional
- Two dimensional
- Three dimensional
- None of these
Q14 | Compression members composed of two channels back-to-back and separated by a small distance are connected together by riveting so that the minimum slenderness ratio of each member between the connections, does not exceed
- 40
- 50
- 60
- 70
Q15 | 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 and h = the outstand of stiffener in mm)
- 75 t²/h
- 125 t3/h²
- 125 t²/h
- 175 t²/h
Q16 | When the upper column does not provide full bearing area over lower column, the column splice is provided with the following assumption
- Bearing plate is assumed as a short beam to transmit the axial load to the lower column section
- Axial load is assumed to be taken by flanges
- Load transmitted from the flanges of upper column and reactions from the flanges of lower columns are equal and form a couple
- All the above
Q17 | For the economical design of a combined footing to support two equal column loads, the projections of beams in lower tier are kept such that bending moment under column is equal to
- Bending moment at the centre of the beam
- Half the bending moment at the centre of the beam
- Twice the bending moment at the centre of the beam
- None of these
Q18 | The allowable shear stress in the web of mild steel beams decreases with (Where 'h is thickness)
- Decrease in h/t ratio
- Increase in h/t ratio
- Decrease in thickness
- Increase in height
Q19 | On eccentrically loaded columns, the equivalent axial load may be obtained by
- Adding the axial load, eccentric load, the product of the bending moment due to eccentric load and the appropriate bending factor
- Adding the axial load and eccentric load and subtracting the product of bending moment and appropriate bending factor
- Dividing the sum of axial load and eccentric load by the product of the bending moment and appropriate bending factor
- None of these
Q20 | In a truss girder of a bridge, a diagonal consists of mild steel flat 4001.S.F. and carries a pull of 80 tonnes. If the gross-diameter of the rivet is 26 mm, the number of rivets required in the splice, is
- 6
- 7
- 8
- 9
Q21 | When the bolts are subjected to reversal of stresses, the most suitable type of boltis
- Black bolt
- Ordinary unfinished bolt
- Turned and fitted bolt
- High strength bolt
Q22 | The size of a butt weld is specified by the effective throat thickness which in the case of incomplete penetration, is taken as
- ½ of the thickness of thicker part
- ¾ of the thickness of thicker part
- ¾ of the thickness of thinner part
- 7/8 of the thickness of thinner part
Q23 | In a built up section carrying a tensile force, the flanges of two channels are turnedoutward
- To simplify the transverse connections
- To minimise lacing
- To have greater lateral rigidity
- All the above
Q24 | The overlap of batten plates with the main members in welded connections should be more than
- 3 t
- 4 t
- 6 t
- 8 tt
Q25 | Modified moment of inertia of sections with a single web, is equal to moment of inertia of the section about Y-Y axis at the point of maximum bending moment and is multiplied by the ratio of
- Area of compression flange at the minimum bending moment to the corresponding area at the point of maximum bending moment
- Area of tension flange at the minimum bending moment of the corresponding area atthe point of maximum bending moment
- Total area of flanges at the maximum bending moment to the corresponding area at the point of maximum bending moment
- None of these