81.
In a beam if the elements of cross sections buckle locally even before reaching yield stress, it belongs to
A
plastic section
B
compact section
C
semi-compact section
D
slender section
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In a beam if the elements of cross sections buckle locally even before reaching yield stress, it belongs to
plastic section
compact section
semi-compact section
slender section
If t is the thickness of thinner plate jointed by intermittent weld, minimum spacing recommended in tension and compression joints are respectively
12 t and 16 t
16 t and 12 t
16 t and 20 t
20 t and 16 t
If t is the thickness of thinner plate in a bolted connection of tension member, pitch shall not be more than the
16t or 200 mm whichever is less
16t or 200 mm whichever is more
12t or 150 mm whichever is less
12t or 150 mm whichever is more
If t is the thickness of thinner member and p is the pitch in bolted connection of a compression member, pitch shall not be more than
16t or 200 mm whichever is less
16t or 200 mm whichever is more
12t or 200 mm whichever is less
12t or 180 mm whichever is less
If span of truss is 40 m and above, preferable spacing of trusses is
4.5 to 6 m
6 to 8 m
8 to 10 m
12–15 m
If span of a roof truss is between 15–30 m, preferable spacing is
3.0 to 4.5 m
4.5 to 6.0 m
6 to 8 m
10–12 m
If packing plate thickness tpk exceeds 6 mm the shear capacity is to be reduced by a factor
1 – 0.25 tpk
1 – 0.100 tpk
1 – 0.0125 tpk
1 – 0.01 tpk
If p is the pitch, d is nominal diameter and d¢ bolt hole diameter, minimum pitch is
3d
3d¢
2.5d
2.5d¢
If intermittent butt welding is used, the space between two welds should not be more than..............times the thickness of the thinner member connected.
12
16
20
24
If fillet weld is to the rounded toe of thickness t, a rolled steel section, the size of weld generally not to exceed
t – 1.5 mm
t – 2.0 mm
4/5 t
3/4 t
If a plate with small hole is kept over another plate and the entire hole is filled with weld material, the weled joint is known as
fillet weld
butt weld
plug weld
slot weld
If a fillet weld is to the square edge, the size of weld shall be at least...............less than the edge thickness
1.5 mm
2.0 mm
2.5 mm
3.0 mm
If 7 mm thick A.C. sheets are used maximum spacing of J bolts is
1.4 m
1.6 m
1.8 m
2.0 m
If 6 mm A.C. sheets are used for roofing, maximum spacing is
1.4 m
1.6 m
1.8 m
2.0 m
HSFG bolts transfer load mainly due to
friction
shearing
bearing
none of the above
Gantry girders are designed to resist
vertical load from cranes
longitudinal and vertical loads
lateral, longitudinal and vertical loads
lateral and longitudinal loads
From the consideration of tearing of section strength of an unequal angle section in tension is...............when short leg is connected compared to when its long leg is connected.
more
less
equal
may be any one of above depending upon the ratio of length of the legs
For welded and double laced joints, effective length of lacing is............times the actua1 1ength.
0.5
0.6
0.7
0.85
For spacing of trusses 3 to 4 m, purling used are
angle iron with outstanding leg at top
angle iron with outstanding leg at bottom
channel sections
I-sections
For HSFG bolts, partial safety factor designed at service load and at ultimate load are respectively
1.10 and 1.25
1.2 and 1.4
1.25 and 1.4
1.25 and 1.5