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
Correct Answer :
C. 20 kg/cm2
Related Questions
In moment resistant connections, the moment resistance of riveted connection depends upon
Shear in rivets
Compression in rivets
Tension in rivets
Strength of rivets in bearing
The greatest permissible clear dimension of the web of thickness t in the panel of a plate girder, is restricted to
180 t
220 t
230 t
270 t
The stress in the wall of a thin cylinder subjected to internal pressure, is
Hoop compression
Shear
Torsional shear
Hoop tension
Minimum spacing of vertical stiffeners is limited to
d/4
d/3
d/2
2d/3 Where d is the distance between flange angles
For a cantilever beam of length L continuous at the support and unrestrained against torsion at the support and free at the end, the effective length l is equal to
l = L
l = 2L
l = 0.5L
l = 3L
Bolts are most suitable to carry
Shear
Bending
Axial tension
Shear and bending
When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which (Where, Fa is the load shared by each rivet due to axial load and Fm is the shearing load due to moment in any rivet.)
Is at the maximum distance from CG of the rivet group
Is at the minimum distance from CG of the rivet group
Gives the maximum angle between the two forces Fa and Fm
Gives the minimum angle between the two forces Fa and Fm
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
The economical depth d of a web plate in which allowable bearing stress is fb, and the maximum bending moment is M, as suggested by Rawater and Clark, is
d = (M/fb)
d = 1.5 (M/fb)
d = 2.5 (M/fb)
d = 4.5 (M/fb)
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
A 20 mm dia steel bar which is subjected to an axial tension of 2300 kg/cm2 produces a strain of 0.004 cm. If Young's modulus of steel is 2.1 × kg/cm2, the bar is
In the elastic range
In the plastic range
At yield point
None of these
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
With a percentage increase of carbon in steel, decreases its
Strength
Hardness
Brittleness
Ductility
Pitch of tacking rivets, when double angles connected back to back and acting as tension members should not be more than
500 mm
600 mm
1000 mm
300 mm
The permissible bearing stress in steel, is
1500 kg/cm2
1890 kg/cm2
2025 kg/cm2
2340 kg/cm2
Cold driven rivets range from
6 to 10 mm in diameter
10 to 16 mm in diameter
12 to 22 mm in diameter
22 to 32 mm in diameter
Pick up the correct statement from the following:
The steel beams placed in plain cement concrete, are known as reinforced beams
The filler joists are generally continuous over three-supports only
Continuous fillers are connected to main beams by means of cleat angles
Continuous fillers are supported by main steel beams
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
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
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
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
A butt weld is specified by
Effective throat thickness
Plate thickness
Size of weld
Penetration thickness
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 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
In the cross-section of a weld, throat is the
Minimum dimension
Average dimension
Maximum dimension
None of the above
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
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)
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
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
The distance measured along one rivet line from the centre of a rivet to the centre of adjoining rivet on an adjacent parallel rivet line, is called
Pitch of rivet
Gauge distance of rivet
Staggered pitch
All the above