Steel Structures with 70 Questions with Answers
1. When the effect of wind
or earthquake
load is taken into account, the permissible stress as specified in rivets
may be
increased
by
A.
33*1/3%
B.
50%
C.
10%
D.
25 %
ANSWER: D
2.
Fillet weld is not recommended if the
angle between fusion face is
(i) less than
45 degree
(ii) greater
than 120 degree
(iii) less
than 60 degree
(iv) greater
than 145 degree
The
correct statements are:
A.
(i)
and (ii)
B.
(i)
and (iv)
C.
(ii) and (iii)
D.
(iii) and ANSWER: C
3.
A lacing column is designed to carry500 kN axial load. Then total transverse
shear resisted by lacing will be
A.
25 kN
B.
6.25 kN
C.
12.5 kN
D.
15 kN
ANSWER: C
4. The
slenderness ratio of lacing
bars should not exceed
A.
100
B.
120
C.
180
D.
145
ANSWER: D
5.
Angle of inclination of the lacing bar with the longitudinal
axis of the column should preferably be between
A.
10 to 30 degree
B.
30 to 80 degree
C.
40 to 70 degree
D.
20 to 70 degree
ANSWER: C
6. If18 mm rivets are
used
in lacing bars, then minimum width of lacing
bars should be
A.
45 mm
B.
50 mm
C.
55 mm
D.
60 mm
ANSWER:
C
|
ANSWER: A
8.
The buckling load
in steel column is
A.
related to length
B.
directly
proportional to the slenderness ratio
C.
inversely proportional
to the slenderness ratio
D.
Non linearity of the slenderness
ratio
ANSWER: A
9. Lug
angles are
A.
used
to reduce the length
of connection
B.
are
unequal angles
C.
increases shear
legs
D.
all of the above
ANSWER: A
10.
Most efficient and economical section
used as abeam is
A.
I section
B.
Circular
section
C.
Angles
D.
H section
ANSWER: A
11. When abeam is subjected
to lateral load then designer choice for section should be
A.
Angle
B.
H section
C.
I section with channel section at
top flange
D.
Lug angle
ANSWER: C
12. Bearing
stiffeners are provided at
1. the
support
2. the
mid span
3. The
point of application of concentrated load
The correct answer is
A.
only1.
B.
1, 2 and 3.
C.
both 1 and 2
D.
both 1 and 3
ANSWER: D
13. In case of buckling, the dispersion of load from bearing
plate
to neutral axis takes
place
at
A.
30 degree
B.
60 degree
C.
45 degree
D.
10 Degree
ANSWER: C
14.
Shear determines the design
of beam when
1. depth of beam section is large
2. depth of beam section is small and uniformly
loaded
3. Large
concentrated loads are placed near beam supports
The correct answer
is
A.
Only
2
B.
1 and
3
C.
2 and
3
D.
Only
2 ANSWER:
C
15. Maximum deflection in steel
beam is limited to
A. L/360
B.
L/325
C.
L/250
D.
L/100
ANSWER: B
16. The
plastic section modulus for a rectangular section of width b and depth d is
A.
bd3/3
B.
bd2/6
C.
bd2/4
D.
bd2/12 ANSWER:
C
17. Plastic modulus for a circular section of diameter
d is
A. d3/6
B.
d3/3
C.
d3/4
D.
d3/5
ANSWER:
A
18.
Shape factor is a property that depends upon
A.
only
the ultimate stress of material
B.
only
on the field stress of the material
C.
only
on geometry of section
D.
both on yield stress and ultimate
stress of the material
ANSWER: C
19.
At fully plastic section, infinite rotation can occur at
A.
zero moment
B.
constant elastic
moment
C.
constant plastic
moment
D.
All of the above
ANSWER: C
20.
A short column subjected
to design axial load and
design uniaxial moment, if eccentricity
(e) is relatively small, column is likely to undergo
A.
tension failure
B.
compression failure
C.
shear
failure
D.
None of these
ANSWER: B
21.
A steel welded plate girder
is subjected to a maximum bending moment of150 t-m. If the maximum permissible bending
stress is 1650 kg/cm^2, then the most economical depth of the girder will be
A.
60 cm
B.
80 cm
C.
100 cm
D.
120 cm ANSWER: D
22.
The problem of lateral
buckling
can
arise
only in those steel beams which
has
A.
moment
of inertia about the bending axis larger than the other
B.
moment
of inertia about the bending axis smaller than the other
C.
fully
supported compression flange
D.
None of the above
ANSWER: A
23.
Racking force on a steel
railway bridge is due to
A.
tracting
effect
B.
breaking
effect
C.
resistance offered by
the bearing to the movement at the roller end
D.
Lateral
movement of the train when moving on a straight track
ANSWER: D
24. Bolts are most suitable to carry
A.
Shear
B.
bending
C.
axial tension
D.
shear and bending
ANSWER: C
25.
Pitch of taking rivets, when double angles
connected back
to back and acting
as tension member should not be more than
A.
500 mm
B.
600 mm
C.
1000 mm
D.
300 mm
ANSWER:
C
26. Battens provided for a compression
member shall be designed to carry
a transverse shear equal
to
A.
2.5 %of axial force
in member
B.
5 %of axial force
in member
C.
10 %of axial force
in member
D.
20 %of axial force
in member
ANSWER: A
27. The
allowable shear stress
in the web of mild steel beams
decreases with
A.
Decrease in h/t ratio
B.
Increase
in h/t ratio
C.
Decrease in thickness
D.
Increase in height
ANSWER: B
28. Intermediate vertical stiffeners are provided
in plate girder to
A.
eliminate web
buckling
B.
eliminate local
buckling
C.
transfer concentrated loads
D.
Prevent excessive deflection
ANSWER: A
29.
The thickness of web for un stiffened plate girder with clear
distanced between the flanges shall not be less than
A.
d/200
B.
d/85
C.
d/100
D.
d/160
ANSWER: B
30.
Generally the purlins
are placed at the panel points so as to avoid
A.
axial force in rafter
B.
shear
force in rafter
C.
deflection
in rafter
D.
bending moment in rafter
ANSWER: D
31.
The risk co-efficient k1 depends on
A.
mean
probable design life of structure
B.
basic
wind speed
C.
both design life and wind speed
D.
none of the given options
ANSWER: C
32.
The external wind pressure acting
on a roof depends on
A.
degree of
permeability
B.
slope of roof
C.
both degree of
permeability and slope of roof
D.
none of the given options
ANSWER:
B
33.
As per IS: 875, for the purpose
of specifying basic
wind velocity, the country
has been divided into
A.
4 zones
B.
5 zones
C.
6 zones
D.
7 zones
ANSWER: C
|
ANSWER:
B
35.
A continuous beam of constant Mp has three equal
spans and carries total
uniformly distributed load 'w' on each
span. The value of collapse
load for the beam will be
A.
12 Mp/L
B.
11.656 Mp/L
C.
8.65 Mp/L
D.
4 Mp/ L
ANSWER: B
36. When designing
steel structures, one must ensure that local buckling in webs does not take place. This check
may not
be very critical when
using rolled steel sections
because
A.
Quality control; at time of manufacturing of
rolled
sections is very good
B.
Web depths
available are small
C.
Web stiffeners are
in built in rolled steel sections
D.
Depth to thickness ratio( of web)
are appropriately adjusted
ANSWER: D
37. In a plate girder, the web plate is connected to the flange plate by fillet welding.
The size of the fillet welds is designed
to safely resist
A.
The bending stresses in the
flanges
B.
Vertical shear force
at the section
C.
Horizontal shear
force between the flanges
and the web plate
D.
The force causing
buckling
in the web
ANSWER: C
38.
A propped cantilever
of span
L is carrying vertical concentrated
load acting at mid span. The
plastic moment of the section
is Mp. The magnitude of the collapse load is
A.
8 Mp/L
B.
6 Mp/L
C.
4 Mp/L
D.
2 Mp/L
ANSWER: B
39. Which of the following is
load factor
A.
Live
load/Dead load
B.
Failure load / Working load
C.
Total
load / Dead load
D.
Dynamic load/ Dead load
ANSWER:
B
40.
Effective length of column effectively held in position and restrained in direction at
one end is
A.
L
B.
0.67L
C.
0.85L
D.
1.5 L
ANSWER:
C
41.
Effective length of column effectively held in position and restrained in direction at
both ends is
A.
L
B.
0.67L
C.
0.85L
D.
1.5 L
ANSWER:
B
42.
Slenderness ratio of a compression member is
A.
Moment
of inertia/Radius of Gyration
B.
Effective
length
/ Area
of cross-section
C.
Radius
of gyration
/ Effective Length
D.
Radius
of gyration
/ Area of cross-section
ANSWER: C
43.
The most economical section
for a column is
A.
Rectangular
B.
solid round
C.
flat
strip
D.
Tubular section
ANSWER:
D
44.
A column splice is used to increase
A.
length
of column
B.
strength of
column
C.
cross-sectional
area
of column
D.
None of these
ANSWER: A
45.
To keep the intensity of bearing
pressure
between the column
base and concrete, compressive throughout the length of the
column base, the ratio of the moment M to axial load P should be
A.
<L/3
B.
<L/6
C.
>L/3
D.
>L/6 ANSWER: B
46.
Net sectional area
of a tension member, is equal
to its gross section area
A.
plus the area of the rivet
holes
B.
divided by the area of rivet
holes
C.
multiplied by the area of the rivet holes
D.
minus the area of the rivet holes
E.
None of these
ANSWER: D
47. A
beam
is defined as a structural member subjected to
A.
axial loading
B.
transverse loading
C.
axial and transverse loading
D.
None of these
ANSWER: B
48. The
rolled steel I-sections are
most commonly used as
beams because these provide
A.
Large
moment of inertia with less cross sectional area
B.
Large
moment of resistance as
compared
to other section
C.
greater lateral stability
D.
All of the above
ANSWER: D
49. In rolled steel beams
shear
force is mostly resisted
by
A.
web
only
B.
flanges only
C.
web
and flanges together
D.
None of these
ANSWER: A
50. The
deflection of beams may be
decreased
by
A.
Increasing the depth of beam
B.
Increasing
the span
C.
Decreasing
the depth of beam
D.
Increasing
the width of beam
E.
None of these
ANSWER: A
51. Web
crippling generally
occur at the point where
A.
Bending
moment is maximum
B.
Shearing force
is minimum
C.
concentrated loads
act
D.
deflection
is maximum
E.
All of the above
ANSWER: C
52. For a column of height
L fixed in position and direction
both at its top and bottom, its effective length
is
A.
L
B.
3L
C.
L/2
D.
2L
ANSWER: D
53.
Stiffeners are
used in a plate girder
A.
to reduce the compressive stress
B.
to reduce the sear
stress
C.
to take the bearing stress
D.
to avoid bulking of web
stress
ANSWER: D
54.
The function of drop panel
in flat slab is
A.
to reduce bending
moment in slab
B.
to reduce shear
stress
in slab
C.
to reduce bending
moment
and shear force in slab
D.
to reduce shear force in slab
ANSWER: B
55.
The constant 'alpha'
used
in calculating moments in exterior panel of flat
slab
depends
on
A.
stiffness of slab
B.
stiffness of column
C.
stiffness of both the slab
and column
D.
stiffness of beam
and column
ANSWER: C
56. In portal frame
rigid connection between
beam and column is useful
A.
to increase stability
B.
to reduce bending
moment in beam
C.
to increase stability and to reduce bending
moment in beam
D.
to reduce bending
moment in slab
ANSWER: C
57.
The bending moment in beam of portal
frame
depends
on
A.
size
of beam
B.
size
of column
C.
support condition
D.
size
of beam, column and support
condition
ANSWER: D
58. If the thickness of a structural member is small as compared
to its length and width, it is classified as
a.
One dimensional
b.
Two
dimensional
c.
Three
dimensional
d.
None of these Answer: B
59.
As per ISI rolled steel beam sections
are classified into
a.
Two
series
b.
Three
series
c.
Four
series
d.
Five
series Answer: D
60.
Rolled steel beams are designated
by Indian
standard series and
its
a.
Weight
perimeter and depth perimeter
b.
Depth
of section and weight
perimeter
c.
Width
of flange and weight
perimeter
d.
Weight
perimeter and flange
width.
Answer: B
61. Rolled steel
tea-section are used
a.
As columns
b.
With
flat strips to connect
pates in steel rectangular
tanks
c.
As built up section to resist axial tension
d.
None of these
Answer: B
62. With a percentage increase
of carbon
in steel, decrease
its
a.
Strength
b.
Hardness
c.
Brittleness
d.
Ductility
Answer: D
63. If P is the wind pressure in
kg/cm2, v is the velocity
in km/hour and K is a constant
of proportionality, then
a.
P =K/v2
b.
v =K/P2
c.
P =Kv2
d.
P=Kv
Answer: C
64. When a load is transferred
through one surface
to another surface
in contact, the stress is
known as
a.
Tensile
stress
b.
Compressive stress
c.
Shearing
stress
d.
None of these
Answer: C
65.
The permissible stress to which a structural
member can be subjected to , is known as
a.
Bearing stress
b.
Working
stress
c.
Tensile
stress
d.
Compressive stress
e.
All of the above
Answer: B
66. Factor
of safety is the ratio of
a.
Yield
stress to working stress
b.
Tensile
stress to working stress
c.
Comprehensive stress to working
stress
d.
Bearing stress
to working stress
e.
Bearing stress
to yield stress
ANSWER: A
67. As per IS : 800, for compression flange, the out stand of flange
plates should
not exceed
a) 12 t b) 16 t c) 20 t d) 25 t
where t = thickness of thinnest
flange plate
ANSWER: B
68. Intermediate vertical stiffeners in a plate girder
need be provided if the depth of
web
exceeds
a) 50 t b) 85 t c) 200 t d) 250 t
ANSWER: B
69. Minimum spacing of vertical stiffeners is limited
to
a) d/4 b) d/3 c) d/2 d) 2d/3 where d is the distance between flange angles
ANSWER: B
70. The maximum spacing of vertical
stiffeners is
a) 1.33 d b) 1.25 d c) 1.50 d d) 1.75 d
ANSWER:C
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