The greatest gauge of long rivets should not exceed (where d is the diameter of the holes).
2 d
4 d
6 d
8 d
Correct Answer :
D. 8 d
Related Questions
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
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
Design of a riveted joint, is based on the assumption:
Load is uniformly distributed among all the rivets
Shear stress on a rivet is uniformly distributed over its gross area
Bearing stress in the rivet is neglected
All the above
A column splice is used to increase
Length of the column
Strength of the column
Cross-sectional area of the column
None of these
For a rectangular section, the ratio of the maximum and average shear stresses, is
1.5
2.0
2.5
3.5
When a large value of radius of gyration is not required
Channels are placed back to back
Channel flanges are kept inward
Channel flanges are kept outward
None of these
The bracing provided in the plane of end posts is called
Sway bracing
Portal bracing
Top lateral bracing
Bottom lateral bracing
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
The strength of a riveted lap joint is equal to its
Shearing strength
Bearing strength
Tearing strength
Least of (a), (b) and (c)
Pick up the correct statement from the following:
Loaded columns are supported on column bases
Column bases transmit the column load to the concrete foundation
Column load is spread over a large area on concrete
All the above
The effective length of a fillet weld should not be less than
Two times the weld size
Four times the weld size
Six times the weld size
Weld size
For double angles carrying tension, placed back to back and connected to either side of the gusset plate, the sectional area of the section, is equal to cross sectional area of
The section
The section plus area of rivet holes
The section minus area of rivet holes
The section multiplied by the area of the rivet hole
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)
Effective length of a column effectively held in position at both ends and restrained in direction at one end, is
L
0.67 L
0.85 L
1.5 L
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 maximum slenderness ratio of a compression member carrying both dead and superimposed load is
180
200
250
350
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
2.Compression members composed of two channels back-to-back and separated by a small distance are connected together by riveting so that the minimum slenderness ratio of each member between the connections, does not exceed
40
50
60
70
In the virtual work method, the virtual quantity is
Displacement
Load
Slope
Moment
Number of rivets required in a joint, is
Load/Shear strength of a rivet
Load/Bearing strength of a rivet
Load/Tearing strength of a rivet
Load/Rivet value
Pick up the correct statement from the following:
The minimum pitch should not be less than 2.5 times the gross diameter of the river
The minimum pitch should not be less than 12 times the gross diameter of the rivet
The maximum pitch should not exceed 10 times the thickness or 150 mm whichever is less in compression
All the above
Perforated cover plates are particularly suitable for built up sections consisting of
Channels placed back to back
Channels placed toe to toe
Four angle box section
All the above
If f is the maximum allowable bending stress in a tension member whose radius of gyration is r and depth is 2y, the required cross sectional area A is given by
A = My/fr²
A = My²/fr²
A = My/fr
A = My/f²r²
The minimum width B of a solid casing for a cased beam, is equal to
B = b + 25 mm
B = b + 50 mm
B = b + 75 mm
B = b + 100 mm
The internal pressure coefficient on walls for buildings with large permeability is taken as
± 0.2
±0.5
± 0.7
0
Rolled steel angle sections are classified as
Equal angles
Unequal angles
Bulb angles
All the above
The ratio of longitudinal stress to strain within elastic limit, is known as
Modulus of elasticity
Shear modulus of elasticity
Bulk modulus of elasticity
All the above
Long column is one
Which is more than 3 m long
Whose lateral dimension is less than 25 cm
Which is free at its top
Which has a ratio of effective length and least lateral dimension more than 15
In case of timber structures, the simple bending formula M = fz may be applied for
Rectangular beams up to 300 mm depth
All rectangular beams
Solid circular beams only
All square cross-section beams
The thickness of the web of a mild steel plate girder is less than d/200. If only one horizontal stiffener is used, it is placed at
The neutral axis of the section
2/3rd of the depth of the neutral axis from the compression flange
2/5th of the depth of the neutral axis from the compression flange
2/5th of the height of the neutral axis from tension flange