Rolled steel angle sections are classified as
Equal angles
Unequal angles
Bulb angles
All the above
Correct Answer :
D. All the above
Related Questions
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
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
The slenderness ratio of lacing bars should not exceed
100
120
145
180
The side thrust T on the tie rods provided at the end beam of jack arch of rise R, is calculated from the formula
T = WL/4R
T = WR/8L
T = WL/8R
T = WL/2R
Rivets connecting flange angles to cover plates in a plate girder are subjected to
Horizontal shear only
Vertical load only
Both (A) and (B)
None of the above
A second horizontal stiffener is always placed at the neutral axis of the girder if the thickness of the web is less than
d/250 for structural steel
d/225 for high tensile steel
Both (c) and (b)
Neither (a) nor (b)
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
The permissible bearing stress in steel, is
1500 kg/cm2
1890 kg/cm2
2025 kg/cm2
2340 kg/cm2
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
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
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
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
In a tension member if one or more than one rivet holes are off the line, the failure of the member depends upon:
Pitch
Gauge
Diameter of the rivet holes
All the above
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
Unequal legged angles with long legs back to back
Unequal legged angles with short legs back to back
Both (B) and (C)
As per IS : 875, for the purposes of specifying basic wind velocity, the country has been divided into
4 zones
5 zones
6 zones
7 zones
Generally the purlins are placed at the panel points so as to avoid
Axial force in rafter
Shear force in rafter
Deflection of rafter
Bending moment in rafter
If the thickness of thinnest outside plate is 10 mm, then the maximum pitch of rivets in tension will be taken as
120 mm
160 mm
200 mm
300 mm
By providing sufficient edge distance, which of the following failures of riveted joint can be avoided?
Tension failure of the plate
Shear failure of the rivet
Shear failure of the plate
Crushing failure of the rivet
For simply supported beams, the maximum permitted deflection, is
1/325 of the span
1/350 of the span
1/375 of the span
1/400 of the span
Diameter of a rivet hole is made larger than the diameter of the rivet by
1.0 mm for rivet diameter upto 12 mm
1.5 mm for rivet diameter exceeding 25 mm
2.0 mm for rivet diameter over 25 mm
None of these
The connection of one beam to another beam by means of an angle at the bottom and an angle at the top, is known as
Unstiffened seated connection
Stiffened seated connection
Seated connection
None of these
The main advantage of a steel member, is:
Its high strength
Its gas and water tightness
Its long service life
All the above
The critical load for a column of length I hinged at both ends and having flexural rigidity El, is given by
Pc = π²EI/l²
Pc = πEI/l²
Pc = πEI/I²
None of these
According to the Unwin's formula, if t is thickness of the plate in mm, the nominal diameter of the rivet, is
d = 1.91 t
d = 1.91 t2
d = 1.91 √t
d = 1.91 t
The rolled steel I-sections are most commonly used as beams because these provide
Large moment of inertia with less cross-sectional area
Large moment of resistance as compared to other section
Greater lateral stability
All the above
If the unsupported length of a stanchion is 4 metres and least radius of gyration of its cross-section is 5, the slenderness ratio of the stanchion, is
60
70
80
100
If d is the distance between the flange angles, the vertical stiffeners in plate girders without horizontal stiffeners, are spaced at a distance not less than
0.15 d
0.22 d
0.33 d
0.44 d
The rivets which are heated and then driven in the field, are known
Power driven shop rivets
Power driven field rivets
Hand driven rivets
Cold driven rivets
For determination of allowable stress in axial compression, Indian Standard Institution has adopted
Euler's formula
Rankine formula
Perry Robertson formula
Secant formula
Net sectional area of a tension member, is equal to its gross section area
Plus the area of the rivet holes
Divided by the area of rivet holes
Multiplied by the area of the rivet holes
None of these