The gross diameter of a rivet is the diameter of
Cold rivet before driving
Rivet after driving
Rivet hole
None of these
Correct Answer :
B. Rivet after driving
Related Questions
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
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
The critical stress on a column for elastic buckling given by Euler's formula, is
fc = π²E/(I/r)²
fc = (I/r)²/ πE
fc = (I/r)/ πE
fc = π²E/(I/r)
Length of an outstanding leg of a vertical stiffener, may be taken equal to
1/10th of clear depth of the girder plus 15 mm
1/20th of clear depth of the girder plus 20 mm
1/25th of clear depth of the girder plus 25 mm
1/30th of clear depth of the girder plus 50 mm
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
A beam is defined as a structural member subjected to
Axial loading
Transverse loading
Axial and transverse loading
None of these
In case of plastic design, the calculated maximum shear capacity of a beam as per IS: 800 shall be
0.55 Aw.fy
0.65 Aw.fy
0.75 Aw.fy
0.85 Aw.fy Where, Aw = effective cross-sectional area resisting shear fy = yield stress of the steel
The maximum slenderness ratio of a compression member carrying both dead and superimposed load is
180
200
250
350
For a rectangular section, the ratio of the maximum and average shear stresses, is
1.5
2.0
2.5
3.5
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 %
The average shear stress for rolled steel beam section, is
845 kg/cm2
945 kg/cm2
1025 kg/cm2
1500 kg/cm2
Web crippling generally occurs at the point where
Bending moment is maximum
Shearing force is minimum
Concentrated loads act
Deflection is maximum
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
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
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
For steel members exposed to weather and not accessible for repainting, the thickness of steel should not be less than
4.5 mm
6 mm
8 mm
10 mm
The difference between gross diameter and nominal diameter for the rivets up to 25 mm diameter is
1.0 mm
1.5 mm
2.0 mm
2.5 mm
A simply supported beam carrying a central load, will be safe in deflection if the ratio of its span to depth, is
< 19
< 24
> 19
> 24
Assuming the values of maximum deviation ΔP and ΔE to be 25% of the computed value of P and E respectively, the minimum value of the factor of safety is
1.00
0.67
1.67
2.67
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
The maximum axial load which is just sufficient to keep a column in a small deflected shape, is called
Crippling load
Buckling load
Critical load
All the above
If L is the overall length of a combined footing having A as its area, d being the distance between the centre of gravity of the base and centre of the base, the larger width b is
(A/L) + (3Ad/L²)
(A/L) + (6Ad/L²)
(A/L) - (6Ad/L²)
(A/L) - (3Ad/L²)
Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is
40 %
50 %
60 %
70 %
According to IS : 800 - 71, the minimum thickness of a vertically stiffened web plate, shall not be less than
d/85
d/200
d/225
d/250
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
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
A riveted joint many experience
Tearing failure of plates
Splitting failure of plates at the edges
Bearing failure of rivets
All the above
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
A butt weld is specified by
Effective throat thickness
Plate thickness
Size of weld
Penetration thickness
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