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Design Of Steel Structures
Quiz 4
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Q.1
For rivets in tension with counter-sunk heads, the tensile value shall be
reduced by 25 %
reduced by 33.3%
increased by 25 %
increased by 33.3 %
Q.2
Area of openings for buildings of large permeability is more than
10% of wall area
20% of wall area
30% of wall area
50% of wall area
Q.3
The overlap of batten plates with the main members in welded connections should be more than (where t = thickness of the batten plate)
3t
4t
6t
8t
Q.4
The capacity of the smallest pressed steel tank is
1000 litre
1650 litre
1950 litre
2450 litre
Q.5
The effective length of a battened column is increased by
5%
10%
15%
20%
Q.6
The statical method of plastic analysis satisfies
equilibrium and mechanism conditions
equilibrium and plastic moment conditions
mechanism and plastic moment conditions
equilibrium condition only
Q.7
Steel tanks are mainly designed for
weight of tank
wind pressure
water pressure
earthquake forces
Q.8
The minimum thickness of plates in a steel stack should be
4 mm
5 mm
6 mm
8 mm
Q.9
The shape factor of an isosceles triangle for bending about the axis parallel to the base is:
1.5
1.7
2.0
2.34
Q.10
The live load for a sloping roof with slope 15°, where access is not provided to roof, is taken as
0.65 kN/m2
0.75 kN/m2
1.35 kN/m2
1.50 kN/m2
Q.11
For the buildings having a low permeability, the internal wind pressure acting normal to the wall and roof surfaces is taken as (where p is basic wind pressure)
zero
±0.2p
± 0.5 p
±0.7p
Q.12
The sway bracing is designed to transfer
2Vi % of the top panel wind load to bottom bracing
10% of the top panel wind load to bottom bracing
25% of the top panel wind load to bottom bracing
50% of the top panel wind load to bottom bracing
Q.13
Load factor is
always equal to factor of safety
always less than factor of safety
always greater than factor of safety
sometimes greater than factor of safety
Q.14
Lug angles
are used to reduce the length of connection.
are unequal angles.
increases shear lag.
all the above
Q.15
The mechanism method of plastic analysis satisfies
equilibrium and mechanism conditions
equilibrium and plastic moment conditions
mechanism and plastic moment conditions
equilibrium condition only
Q.16
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.)
is at the maximum distance from CG of the rivet group
is at the minimum distance from CG of the rivet group
gives the maximum angle between the two forces Fa and Fm
gives the minimum angle between the two forces Fa and Fm
Q.17
Which of the following conditions is to be satisfied both in elastic and plastic analysis ?
equilibrium condition
yield condition
plastic moment condition
mechanism condition
Q.18
Bending compressive and tensile stresses respectively are calculated based on
net area and gross area
gross area and net area
net area in both cases
gross area in both cases
Q.19
The internal pressure coefficient on walls for buildings with large permeability is taken as
± 0.2
±0.5
± 0.7
0
Q.20
The relation between intensity of wind pressure p and velocity of wind V is taken as
pa V
paV2
p a (1/V)
paV”2
Q.21
If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be
40mm
60mm
80mm
100mm
Q.22
The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible for cleaning and repainting, should be:
4.5 mm
6 mm
8 mm
10 mm
Q.23
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.24
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.25
Gantry girders are designed to resist
lateral loads
longitudinal loads and vertical loads
lateral, longitudinal and vertical loads
lateral and longitudinal loads
Q.26
The maximum slenderness ratio of a compression member carrying both dead and superimposed load is
180
200
250
350
Q.27
Economical depth of a plate girder corresponds to
minimum weight
minimum depth
maximum weight
minimum thickness of web
Q.28
Minimum pitch of the rivets shall not be less than (where d is gross diameter of rivet)
1.5 d
2.0 d
2.5 d
3.0 d
Q.29
The basic wind speed is specified at a height ‘h’ above mean ground level in an open terrain. The value of ’h’ is
10 m
20 m
25 m
50 m
Q.30
The heaviest I-section for same depth is
ISMB
ISLB
ISHB
ISWB
0 h : 0 m : 1 s
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