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Civil Engineering
Design Of Steel Structures
Quiz 5
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Q.1
The centrifugal force due to curvature of track is assumed to act on the bridge at a height of
1.23 m above the rail level
1.50 m above the rail level
1.83 m above the rail level
2.13 m above the rail level
Q.2
Bearing stiffener in a plate girder is used to
transfer the load from the top flange to the bottom one
prevent buckling of web
decrease the effective depth of web
prevent excessive deflection
Q.3
As per IS :for compression flange, the outstand of flange plates should not exceed (where t = thickness of thinnest flange plate)
121
161
201
251
Q.4
In case of plastic design, the calculated maximum shear capacity of a beam as per IS:shall be (where, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel)
0.55 Awfy
0.65 Awfy
0.75 Awfy
0.85 Awfy
Q.5
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 or earthquake
Q.6
Lacing bars in a steel column should be designed to resist
Bending moment due to 2.5% of the column load
Shear force due to 2.5% of the column load
2.5% of the column load
Both (A) and (B)
Q.7
Angle of inclination of the lacing bar with the longitudinal axis of the column should preferably be between
10° to 30°
30° to 40°
40° to 70°
90°
Q.8
The risk coefficient k, depends on
mean probable design life of structures
basic wind speed
both (a) and (b)
none of the above
Q.9
Which of the following types of riveted joint is free from bending stresses ?
lap joint
butt joint with single cover plate
butt joint with double cover plates
none of the above
Q.10
When the bolts are subjected to reversal of stresses, the most suitable type of bolt is
black bolt
ordinary unfinished bolt
turned and fitted bolt
high strength bolt
Q.11
The best arrangement to provide unified behaviour in built up steel columns is by
lacing
battening
tie plates
perforated cover plates
Q.12
The maximum spacing of vertical stiffeners is (where d is the distance between flange angles)
1.33 d
1.25 d
1.5 d
1.75 d
Q.13
Minimum spacing of vertical stiffeners is limited to (where d is the distance between flange angles)
d/4
d/3
d/2
2d/3
Q.14
Which of the following sections should preferably be used at places where torsion occurs?
Angle section
Channel section
Box type section
Any of the above
Q.15
As compared to field rivets, the shop rivets are
stronger
weaker
equally strong
any of the above
Q.16
According to IS Specifications, the maximum pitch of rivets in compression is (where t is thickness of thinnest outside plate or angle)
lesser of 200 mm and 12 t
lesser of 200 mm and 161
lesser of 300 mm and 32 t
lesser of 3 00 mm and 24 t
Q.17
Compression force in two end posts The pin of a rocker bearing in a bridge is designed for
bearing and shear
bending and shear
bearing and bending
bearing, shear and bending
Q.18
According to IS Specifications, the effective length of a column effectively held in position at both ends and restrained in direction at one end is taken as
0.67 L
0.8 L
L
1.5 L
Q.19
The allowable shear stress in the web of mild steel beams decreases with (where ‘h’ is height and t is thickness)
decrease in h/t ratio
increase in h/t ratio
decrease in thickness
increase in height
Q.20
The diameter of base of conical flare of a steel stack is (where d is the diameter of the cylindrical part)
less than d
equal to d
more than d
any of the above
Q.21
A butt weld is specified by
effective throat thickness
plate thickness
size of weld
penetration thickness
Q.22
The bracing provided in the plane of end posts is called
sway bracing
portal bracing
top lateral bracing
bottom lateral bracing
Q.23
For a compression member with double angle section, which of the following section will give larger value of minimum radius of gyration?
equal angles back to back
unqual legged angles with long legs back to back
unequal legged angles with short legs back to back
both (b) or (c)
Q.24
The effective length of a battened strut effectively held in position at both ends but not restrained in direction is taken as
1.8 L
1.3 L
1.1 L
1.5 L
Q.25
In case of timber structures, the form factor for solid circular cross-section is taken as
1.18
1.414
1.67
1.81
Q.26
Study the following statements.i) Top lateral bracing prevents the sidesway buckling of the chord.ii) Sway bracing keeps the rectangular shape of the bridge cross-section.iii) Sway bracing transfers the load from top of end posts to bearings.The correct answer is
only (i)
both (i) and (ii)
both (i) and (iii)
all (i), (ii) and (iii)
Q.27
The effect of racking forces is considered in the design ofi) lateral bracesii) chord membersThe correct answer is
only (i)
only (ii)
both (i) and (ii)
none of the above
Q.28
Bearing stiffeners are provided ati) the supportsii) the mid spaniii) the point of application of concentrated loads The correct answer is
only (i)
both (i) and (ii)
both (i) and (iii)
(i), (ii) and (iii)
Q.29
Battening is preferable when thei) column carries axial load onlyii) space between the two main components is not very largeiii) column is eccentrically loaded The correct answer is
only (i)
only (iii)
(i) and (ii)
(ii) and (iii)
Q.30
The web crippling due to excessive bearing stress can be avoided by
increasing the web thickness
providing suitable stiffeners
increasing the length of the bearing plates
none of the above
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