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
Correct Answer :
C. Is always greater than 1
Related Questions
Minimum spacing of vertical stiffeners is limited to
d/4
d/3
d/2
2d/3 Where d is the distance between flange angles
The minimum thickness of plates in a steel stack should be
4 mm
5 mm
6 mm
8 mm
The moment of the couple set up in a section of a beam by the longitudinal compressive and tensile force, is known as
Bending moment
Moment of resistance
Flexural stress moment
None of these
As per IS : 800, for compression flange, the outstand of flange plates should not exceed
12 t
16 t
20 t
25 t Where t = thickness of thinnest flange plate
A steel beam supporting loads from the floor slab as well as from wall is termed as
Stringer beam
Lintel beam
Spandrel beam
Header beam
The forces acting on the web splice of a plate girder are
Axial forces
Shear and axial forces
Shear and bending forces
Axial and bending forces
The load on a lintel is assumed as uniformly distributed if the height of the masonry above it, is upto a height of
The effective span
1.25 times the effective span
1.50 times the effective span
2.0 times the effective span
Outstanding length of a compression member consisting of a channel, is measured as
Half of the nominal width
Nominal width of the section
From the edge to the first row of rivets
None of these
Pick up the correct statement from the following:
Vertical stiffeners may be placed in pairs one on each side of the web
Single vertical stiffeners may be placed alternately on opposite sides of the web
Horizontal stiffeners may be placed alternately on opposite sides of the web
All the above
The distance between e.g. of compression and e.g. of tension flanges of a plate girder, is known as
Overall depth
Clear depth
Effective depth
None of these
Which of the following sections should preferably be used at places where torsion occurs?
Angle section
Channel section
Box type section
Any of the above
If the loaded length of span in meters of a railway steel bridge carrying a single track is 6 m, then impact factor is taken as
0
0.5
Between 0.5 and 1.0
1.0
The maximum tensile and compressive bending stress in extreme fibres of rolled I-sections and channels on the effective section, is
1500 kg/cm2
1420 kg/cm2
1650 kg/cm2
2285 kg/cm2
A beam may be designed as a cased beam if
Section is of double open channel form with the webs not less than 40 mm apart
Overall depth and width of the steel section do not exceed 750 and 450 mm respectively
Beam is solidly encased in concrete with 10 mm aggregate having 28 days strength 160 kg/cm2
All the above
For a rectangular section, the ratio of the maximum and average shear stresses, is
1.5
2.0
2.5
3.5
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
Rolled steel Tee-sections are used
As columns
With flat strips to connect plates in steel rectangular tanks
As built up sections to resist axial tension
None of these
The heaviest I-section for same depth is
ISMB
ISLB
ISHB
ISWB
Bearing stiffener in a plate girder is used to
Transfer the load from the top flange to the bottom one
Prevent buckling of web
Decrease the effective depth of web
Prevent excessive deflection
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
When the depth of a plate girder is at least n times the depth of vertical leg of the flange angles, the girder is known as deep plate girder, if n is
2
4
6
8
The safe working pressure for a spherical vessel 1.5 m diameter and having 1.5 cm thick wall not to exceed tensile stress 50kg/cm2, is
16 kg/cm2
18 kg/cm2
20 kg/cm2
22 kg/cm2
The size of a butt weld is specified by the effective throat thickness which in the case of incomplete penetration, is taken as
½ of the thickness of thicker part
¾ of the thickness of thicker part
¾ of the thickness of thinner part
7/8 of the thickness of thinner part
The maximum permissible slenderness ratio of compression member carrying dead and superimposed load, is
180
200
250
350
The allowable shear stress in the web of mild steel beams decreases with
Decrease in h/t ratio
Increase in h/t ratio
Decrease in thickness
Increase in height Where 'h' is height and t is thickness
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
Bulb angles are used in
Column building
Bridge building
Ship building
Water tank building
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
The most commonly used sections in lateral system to carry shear force in built up columns, are
Rolled steel flats
Rolled angles
Rolled channels
All the above
According to IS Specifications, the effective length of a column effectively held in position at both ends and restrained in direction at one end is taken as
0.67 L
0.8 L
L
1.5 L