Rolled steel beams are:
Mainly used to resist bending stress
Used as independent sections to resist compressive stress
Used as independent sections to resist tensile stress
All the above
Correct Answer :
D. All the above
Related Questions
If the thickness of a structural member is small as compared to its length and width, it is classified as
One dimensional
Two dimensional
Three dimensional
None of these
The minimum thickness of plates in a steel stack should be
4 mm
5 mm
6 mm
8 mm
The maximum permissible slenderness ratio of compression member carrying dead and superimposed load, is
180
200
250
350
The stress in the wall of a thin cylinder subjected to internal pressure, is
Hoop compression
Shear
Torsional shear
Hoop tension
The deflection of beams may be decreased by
Increasing the depth of beam
Increasing the span
Decreasing the depth of beam
Increasing the width of beam
For steel members not exposed to weather, the thickness of steel should not be less than
4.5 mm
6 mm
8 mm
10 mm
In case horizontal stiffeners are not used, the distance between vertical legs of flange angles at the top and bottom of a plate girder, is known as
Overall depth
Clear depth
Effective depth
None of these
Hudson's formula gives the dead weight of a truss bridge as a function of
Bottom chord area
Top chord area
Effective span of bridge
Heaviest axle load of engine
The spans are considered approximately equal if the longest span does not exceed the shortest span by more than
5 %
10 %
15 %
20 %
Rolled steel beams are designated by Indian Standard series and its
Weight per metre and depth of its section
Depth of section and weight per metre
Width of flange and weight per metre
Weight per metre and flange width
According to IS: 800, in the Merchant Rankine formula the value of imperfection index (n) is
1.0
1.4
1.8
2.0
The mechanism method and the statical method give
Lower and upper bounds respectively on the strength of structure
Upper and lower bounds respectively on the strength of structure
Lower bound on the strength of structure
Upper bound on the strength of structure
The diameter of base of conical flare of a steel stack is
Less than d
Equal to d
More than d
Any of the above Where d is the diameter of the cylindrical part
When the length of a tension member is too long
A wire rope is used
A rod is used
A bar is used
A single angle is used
When the axis of load lies in the plane of rivet group, then the rivets are subjected to
Only shear stresses
Only tensile stresses
Both (A) and (B)
None of the above
Design of a riveted joint is based on the assumption:
Bending stress in rivets is accounted for
Riveted hole is assumed to be completely filled by the rivet
Stress in the plate in not uniform
Friction between plates is taken into account
Study the following statements. (i) Top lateral bracing prevents the sides-way buckling of the chord. (ii) Sway bracing keeps the rectangular shape of the bridge crosssection. (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)
If P is the wind pressure in kg/cm2, v is the velocity in km/hour and K is a constant of proportionality, then
P = K/v2
v = K/P2
P = Kv2
P = Kv
The allowable tensile stress in structural mild steel plates for steel tank is assumed as
95.0 MPa on net area
105.5 MPa on net area
105.5 MPa on gross area
150.0 MPa on gross area
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)
Poisson's ratio for steel within elastic limit, ranges from
0.15 to 0.20
0.25 to 0.24
0.25 to 0.33
0.33 to 0.35
If d is the distance between the flange angles, the vertical stiffeners in plate girders are spaced not greater than
d
1.25 d
1.5 d
1.75 d
For a rectangular section, the ratio of the maximum and average shear stresses, is
1.5
2.0
2.5
3.5
If the floor is supported at or near the bottom but top chords of a bridge is not braced, then the bridge is called
Deck type
Through type
Half through type
Double deck type
To the calculated area of cover plates of a built-up beam, an allowance for rivet holes to be added, is
10 %
13 %
15 %
18 %
If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be
40 mm
60 mm
80 mm
100 mm
To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be
1
2
3
4
Strengths of a rivet in single shearing, in bearing and in tearing are 3425 kg, 4575 kg and 5025 kg respectively. If the load in the member is 35 tonnes, the number of rivets required, is
10
11
12
13
The cross-section of a standard fillet is a triangle whose base angles are
45° and 45°
30° and 60°
40° and 50°
20° and 70°
According to IS Specifications, the maximum pitch of rivets in compression is
Lesser of 200 mm and 12 t
Lesser of 200 mm and 16 t
Lesser of 300 mm and 32 t
Lesser of 3 00 mm and 24 t Where t is thickness of thinnest outside plate or angle