The number of seismic zones in which the country has been divided is
3
5
6
7
Correct Answer :
B. 5
Related Questions
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
According to IS : 800-1962 the permissible bending stress in steel slab plates, is
1500 kg/cm2
1420 kg/cm2
2125 kg/cm2
1890 kg/cm2
Stiffeners are used in a plate girder
To reduce the compressive stress
To reduce the shear stress
To take the bearing stress
To avoid bulking of web plate
The effective length of a compression member of length L held in position at both ends but not restrained in direction, is
L
0.67 L
0.85 L
1.5 L
If the depth of the section of an upper column is smaller than the lower column
Filler plates are provided with column splice
Bearing plates are provided with column splice
Filler plates and bearing plates are provided with column splice
None of these
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
If the area of cross-section of a single angle discontinuous strut is 30 cm2 and allowable working stress corresponding to its slenderness ratio is 625 kg/cm2, the safe load carrying capacity of the member, is
10 tonnes
12 tonnes
15 tonnes
18 tonnes
Other conditions being same, the load factor in indeterminate structures is
Equal to load factor in determinate structures
More than the load factor in determinate structures
Less than the load factor in determinate structures
Unpredictable
In a gusseted base, when the end of the column is machined for complete bearing on the base plate, then the axial load is assumed to be transferred to base plate
Fully by direct bearing
Fully through fastenings
50% by direct bearing and 50% through fastenings
75% by direct bearing and 25% through fastenings
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
The beam outside a wall upto floor level above it, is known as
Rafter
Purlin
Spandrel beam
Lintel
Working shear stress on the gross area of a rivet as recommended by Indian Standards, is
785 kg/cm2
1025 kg/cm2
2360 kg/cm2
None of these
The beams supporting the steps of a stair are generally known as
Headers
Trimmers
Stringers
Spandrel beams
The web crippling due to excessive bearing stress can be avoided by
Increasing the web thickness
Providing suitable stiffener
Increasing the length of the bearing plates
None of the above
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
For rivets in tension with countersunk heads, the tensile value shall be
Reduced by 25 %
Reduced by 33.3%
Increased by 25 %
Increased by 33.3 %
Tongue plates are provided in a steel girder at
The upper flange
The lower flange
The upper end of the web
The upper and lower ends of the web
When a load is transferred through one surface to another surface in contact, the stress is known as
Tensile stress
Compressive stress
Shearing stress
None of these
For determination of allowable stress in axial compression, Indian Standard Institution has adopted
Euler's formula
Rankine formula
Perry Robertson formula
Secant formula
The minimum pitch of rivet holes of diameter d should not be less than
d
1.25 d
1.5 d
2.5 d
Rise of a Jack arch is kept about
1/2 to 1/3 of the span
1/3 to 1/4 of the span
1/4 to 1/8 of the span
1/8 to 1/12 of the span
The external wind pressure acting on a roof depends on
Degree of permeability of roof
Slope of roof
Both (A) and (B)
None of the above
If fbt and fc are the co-existent bending tensile stress and shear stress in a member, the equivalent stress fc is
√(fbt² + fc²)
√(fbt² + ½fc²)
√(fbt² + 3fc²)
√(fbt² - 3fc²)
IS : 800 - 1971 recommends that in a splice plate the number of rivets carrying calculated shear stress through a packing greater than 6 mm thick, is to be increased by 2.5% for every
1.00 mm thickness of packing
1.50 mm thickness of packing
2.0 mm thickness of packing
2.50 mm thickness of packing
The number of seismic zones in which the country has been divided is
3
5
6
7
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
The basic wind speed is specified at a height 'h' above mean ground level in an open terrain. The value of 'h' is
10 m
20 m
25 m
50 m
Horizontal stiffener in a plate girder is provided to safeguard against
Shear buckling of web plate
Compression buckling of web plate
Yielding
All of the above
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
Modified moment of inertia of sections with a single web, is equal to moment of inertia of the section about Y-Y axis at the point of maximum bending moment and is multiplied by the ratio of
Area of compression flange at the minimum bending moment to the corresponding area at the point of maximum bending moment
Area of tension flange at the minimum bending moment of the corresponding area at the point of maximum bending moment
Total area of flanges at the maximum bending moment to the corresponding area at the point of maximum bending moment
None of these