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Design Of Steel Structures
Quiz 1
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Q.1
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.2
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.3
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.4
Select the correct statement
Material cost of a rivet is higher than that of a bolt
Tensile strength of a bolt is lesser than that of a rivet
Bolts are used as a temporary fastening whereas rivets are used as permanent fastenings
Riveting is less noisy than bolting
Q.5
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.6
The portal bracing in a truss bridge is used to
Transfer load from top of end posts to bearings
Keep the rectangular shape of the bridge cross-section
Stiffen the structure laterally
Prevent the sides-way buckling of top chord
Q.7
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.8
The ratio of plastic section modulus to elastic section modulus
is equal to 1
is always less than 1
is always greater than 1
can be less than 1
Q.9
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
Q.10
Battening is preferable when the
i) column carries axial load only
ii) space between the two main components is not very large
iii) column is eccentrically loaded
The correct answer is
only (i)
only (iii)
(i) and (ii)
(ii) and (iii)
Q.11
Bearing stiffeners are provided at
i) the supports
ii) the mid span
iii) 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.12
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.13
The risk coefficient k, depends on
mean probable design life of structures
basic wind speed
both (a) and (b)
none of the above
Q.14
As per IS : 800, for compression flange, the outstand of flange plates should not exceed (where t = thickness of thinnest flange plate)
121
161
201
251
Q.15
Economical depth of a plate girder corresponds to
minimum weight
minimum depth
maximum weight
minimum thickness of web
Q.16
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.17
The maximum slenderness ratio of a compression member carrying both dead and superimposed load is
180
200
250
350
Q.18
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.19
Minimum thickness of web in a plate girder, when the plate is accessible and also exposed to weather, is
5 mm
6 mm
8 mm
10 mm
Q.20
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.21
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.22
The best arrangement to provide unified behaviour in built up steel columns is by
lacing
battening
tie plates
perforated cover plates
Q.23
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.24
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.25
As compared to field rivets, the shop rivets are
stronger
weaker
equally strong
any of the above
Q.26
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.27
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.28
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.29
A butt weld is specified by
effective throat thickness
plate thickness
size of weld
penetration thickness
Q.30
The bracing provided in the plane of end posts is called
sway bracing
portal bracing
top lateral bracing
bottom lateral bracing
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