Design of Steel Structures objective question and answer part 2
Question No. 101
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
(A) d = (M/fb)
(B) d = 1.5 (M/fb)
(C) d = 2.5 (M/fb)
(D) d = 4.5 (M/fb)
Answer: Option D
Question No. 102
Bending compressive and tensile stresses respectively are calculated based on
(A) Net area and gross area
(B) Gross area and net area
(C) Net area in both cases
(D) Gross area in both cases
Answer: Option B
Question No. 103
The thickness t of a single flat lacing should not be less than
(A) 1/30th length between inner end rivets
(B) 1/40th length between inner end rivets
(C) 1/50th length between inner end rivets
(D) 1/60th length between inner end rivets
Answer: Option B
Question No. 104
Minimum pitch of the rivets shall not be less than
(A) 1.5 d
(B) 2.0 d
(C) 2.5 d
(D) 3.0 d
Where d is gross diameter of rivet
Answer: Option C
Question No. 105
Tongue plates are provided in a steel girder at
(A) The upper flange
(B) The lower flange
(C) The upper end of the web
(D) The upper and lower ends of the web
Answer: Option D
Question No. 106
For steel members exposed to weather and not accessible for repainting, the thickness of steel
should not be less than
(A) 4.5 mm
(B) 6 mm
(C) 8 mm
(D) 10 mm
Answer: Option C
Question No. 107
The slenderness ratio of a column supported throughout its length by a masonry wall is
(A) Zero
(B) 10
(C) 100
(D) Infinity
Answer: Option A
Question No. 108
The main assumption of the method of simple design of steel frame work, is:
(A) Beams are simply supported
(B) All connections of beams, girders and trusses are virtually flexible
(C) Members in compression are subjected to forces applied at appropriate eccentricities
(D) All the above
Answer: Option D
Question No. 109
Outstanding length of a compression member consisting of a channel, is measured as
(A) Half of the nominal width
(B) Nominal width of the section
(C) From the edge to the first row of rivets
(D) None of these
Answer: Option B
Question No. 110
The use of tie plates in laced columns is
(A) Prohibited
(B) Not prohibited
(C) Permitted at start and end of lacing system only
(D) Permitted between two parts of the lacing
Answer: Option C
Question No. 111
According to IS : 800-1962 the permissible bending stress in steel slab plates, is
(A) 1500 kg/cm2
(B) 1420 kg/cm2
(C) 2125 kg/cm2
(D) 1890 kg/cm2
Answer: Option D
Question No. 112
The side thrust T on the tie rods provided at the end beam of jack arch of rise R, is calculated from
the formula
(A) T = WL/4R
(B) T = WR/8L
(C) T = WL/8R
(D) T = WL/2R
Answer: Option C
Question No. 113
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
t
Answer: Option B
Question No. 114
The minimum pitch of rivet holes of diameter d should not be less than
(A) d
(B) 1.25 d
(C) 1.5 d
(D) 2.5 d
Answer: Option D
Question No. 115
Design of a riveted joint, is based on the assumption:
(A) Load is uniformly distributed among all the rivets
(B) Shear stress on a rivet is uniformly distributed over its gross area
(C) Bearing stress in the rivet is neglected
(D) All the above
Answer: Option D
Question No. 116
For the buildings having a low permeability, the internal wind pressure acting normal to the wall
and roof surfaces is taken as
(A) Zero
(B) ±0.2 p
(C) ± 0.5 p
(D) ±0.7 p
Where p is basic wind pressure
Answer: Option B
Question No. 117
If is the maximum allowable bending stress in a tension member whose radius of gyration
is and depth is 2y, the required cross sectional area is given by
(A) A = My/fr²
(B) A = My²/fr²
(C) A = My/fr
(D) A = My/f²r²
Answer: Option A
Question No. 118
The load on a lintel is assumed as uniformly distributed if the height of the masonry above it, is
upto a height of
(A) The effective span
(B) 1.25 times the effective span
(C) 1.50 times the effective span
(D) 2.0 times the effective span
Answer: Option B
Question No. 119
Maximum pitch of rivets, used in steel stacks, is limited to
(A) 6 t
(B) 10 t
(C) 12 t
(D) 16 t
t
Answer: Option B
Question No. 120
Diameter of a rivet hole is made larger than the diameter of the rivet by
(A) 1.0 mm for rivet diameter upto 12 mm
(B) 1.5 mm for rivet diameter exceeding 25 mm
(C) 2.0 mm for rivet diameter over 25 mm
(D) None of these
Answer: Option C
Question No. 121
According to IS: 800-1962, the coefficient of expansion of steel per degree centigrade per unit
length, is taken as
(A) 0.000008
(B) 0.000010
(C) 0.000012
(D) 0.000014
Answer: Option C
Question No. 122
In case of timber structures, the simple bending formula M = fz may be applied for
(A) Rectangular beams up to 300 mm depth
(B) All rectangular beams
(C) Solid circular beams only
(D) All square cross-section beams
Answer: Option A
Question No. 123
Perforated cover plates are particularly suitable for built up sections consisting of
(A) Channels placed back to back
(B) Channels placed toe to toe
(C) Four angle box section
(D) All the above
Answer: Option C
Question No. 124
If R is the reaction on the bearing plate, the minimum moment of. inertia of the bearing stiffener
provided at the support of a plate girder of overall depth D, the maximum thickness of the
compression flange T, carrying total load W, is
(A) (D²/250) × (R/W)
(B) (D
3
T/250) × (R/W)
(C) (DT/250) × (R/W)
(D) (DT/250) × (W/R)
Answer: Option B
Question No. 125
As per IS: 800, in the plastic design, which of the following pairs are correctly matched?
Working Loads Load factor
(i) Dead load 1.7
(ii) Dead Load + imposed load 1.7
(iii) Dead load + load due to wind or 1.3 seismic forces
(iv) Dead load + imposed load + load 1.7 due to wind or seismic forces
Of these statements
(A) (i) and (ii) are correct
(B) (i), (ii) and (iii) are correct
(C) (ii) and (iii) are correct
(D) Only (i) is correct
Answer: Option A
Question No. 126
Effective length of a column effectively held in position and restrained in direction at both ends, is
(A) L
(B) 0.67 L
(C) 0.85 L
(D) 1.5 L
Answer: Option B
Question No. 127
Pick up the correct statement from the following:
(A) The ends of a strut, are connected together with two rivets
(B) The members of strut will have at least two connections spaced equidistant in their length
(C) The members when separated back-to-back, the connecting rivets should pass through solid
washer or packing
(D) All the above
Answer: Option D
Question No. 128
For rivets in tension with countersunk heads, the tensile value shall be
(A) Reduced by 25 %
(B) Reduced by 33.3%
(C) Increased by 25 %
(D) Increased by 33.3 %
Answer: Option B
Question No. 129
Effective length of a column effectively held in position and restrained in direction at one end but
neither held in position nor restrained in direction at the other end, is
(A) 1.5 L
(B) 0.67 L
(C) 0.85 L
(D) 2 L
Answer: Option D
Question No. 130
The equivalent axial load may be defined as the load which produces a stress equal to
(A) Maximum stress produced by the eccentric load
(B) Maximum stressed fibre
(C) Bending stress
(D) None of these
Answer: Option A
Question No. 131
If the thickness of thinnest outside plate is 10 mm, then the maximum pitch of rivets in tension
will be taken as
(A) 120 mm
(B) 160 mm
(C) 200 mm
(D) 300 mm
Answer: Option B
Question No. 132
The connection of one beam to another beam by means of an angle at the bottom and an angle at
the top, is known as
(A) Unstiffened seated connection
(B) Stiffened seated connection
(C) Seated connection
(D) None of these
Answer: Option C
Question No. 133
The channels get twisted symmetrically with regard to its axis
(A) Parallel to flanges
(B) Parallel to web
(C) Perpendicular to flanges
(D) Perpendicular to web
Answer: Option B
Question No. 134
Bolts are most suitable to carry
(A) Shear
(B) Bending
(C) Axial tension
(D) Shear and bending
Answer: Option C
Question No. 135
Rolled steel angle sections are classified as
(A) Equal angles
(B) Unequal angles
(C) Bulb angles
(D) All the above
Answer: Option D
Question No. 136
According to I.S. : 800 - 1871, lacing bars resist transverse shear equal to
(A) 1.0% of the axial load
(B) 2.0% of the axial load
(C) 2.5% of the axial load
(D) 3.0% of the axial load
Answer: Option C
Question No. 137
The effective length of a battened strut effectively held in position at both ends but not restrained
in direction is taken as
(A) 1.8 L
(B) L
(C) 1.1 L
(D) 1.5 L
Answer: Option C
Question No. 138
The method of design of steel framework for greatest rigidity and economy in weight, is known as
(A) Simply design
(B) Semi-rigid design
(C) Fully rigid design
(D) None of these
Answer: Option C
Question No. 139
For a cantilever beam of length built-in at the support and restrained against torsion at the free
end, the effective projecting length is
(A) l = 0.7 L
(B) l = 0.75 L
(C) l = 0.85 L
(D) l = 0.5 L
Answer: Option B
Question No. 140
Economical depth of a plate girder corresponds to
(A) Minimum weight
(B) Minimum depth
(C) Maximum weight
(D) Minimum thickness of web
Answer: Option A
Question No. 141
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: Option C
Question No. 142
The least permissible clear dimension of the web of thickness t in the panel of a plate girder, is
restricted to
(A) 150 t
(B) 160 t
(C) 170 t
(D) 180 t
Answer: Option D
Question No. 143
Bearing stiffeners are provided at
(i) The supports
(ii) The mid span
(iii) The point of application of concentrated loads
The correct answer is
(A) Only (i)
(B) Both (i) and (ii)
(C) Both (i) and (iii)
(D) (i), (ii) and (iii)
Answer: Option C
Question No. 144
Web crippling generally occurs at the point where
(A) Bending moment is maximum
(B) Shearing force is minimum
(C) Concentrated loads act
(D) Deflection is maximum
Answer: Option C
Question No. 145
Pick up the correct statement from the following:
(A) The slenderness ratio of lacing bars for compression members should not exceed 145
(B) The minimum width of lacing bar connected with rivets of nominal diameter 16 mm, is kept
50 mm
(C) The minimum thickness of a flat lacing bar is kept equal to one-fortieth of its length between
inner end rivets
(D) All the above
Answer: Option D
Question No. 146
The basic wind speed is specified at a height 'h' above mean ground level in an open terrain. The
value of 'h' is
(A) 10 m
(B) 20 m
(C) 25 m
(D) 50 m
Answer: Option A
Question No. 147
If d is the distance between the flange angles, the vertical stiffeners in plate girders are spaced not
greater than
(A) d
(B) 1.25 d
(C) 1.5 d
(D) 1.75 d
Answer: Option C
Question No. 148
If d is the distance between the flange angles of a plate girder, vertical stiffeners are provided at a
distance not greater than
(A) d but not less than 0.20 d
(B) 1.25 d but not less than 0.33 d
(C) 1.5 d but not less than 0.33 d
(D) 2.0 d but not less than 0.50 d
Answer: Option B
Question No. 149
The allowable tensile stress in structural mild steel plates for steel tank is assumed as
(A) 95.0 MPa on net area
(B) 105.5 MPa on net area
(C) 105.5 MPa on gross area
(D) 150.0 MPa on gross area
Answer: Option B
Question No. 150
A second horizontal stiffener is always placed at the neutral axis of the girder if the thickness of
the web is less than
(A) d/250 for structural steel
(B) d/225 for high tensile steel
(C) Both (c) and (b)
(D) Neither (a) nor (b)
Answer: Option C
Question No. 151
The strength of ISA 125 = 75 × 10 mm used as a tie member with its longer leg connected at the
ends by 27 mm diameter rivets, is
(A) 26,000 kg
(B) 26,025 kg
(C) 26,050 kg
(D) 26,075 kg
Answer: Option D
Question No. 152
The effect of racking forces is considered in the design of
(i) Lateral braces
(ii) Chord members
The correct answer is
(A) Only (i)
(B) Only (ii)
(C) Both (i) and (ii)
(D) None of the above
Answer: Option A
Question No. 153
For a column of height fixed in position and direction both at its top and bottom, its effective
length, is
(A) L
(B) L
(C) ½ L
(D) 2L
Answer: Option C
Question No. 154
As per ISI, rolled steel beam sections are classified into
(A) Two series
(B) Three series
(C) Four series
(D) Five series
Answer: Option D
Question No. 155
Shape factor is a property which depends
(A) Only on the ultimate stress of the material
(B) Only on the yield stress of the material
(C) Only on the geometry of the section
(D) Both on the yield stress and ultimate stress of material
Answer: Option C
Question No. 156
A tension member, if subjected to possible reversal of stress due to wind, the slenderness ratio of
the member should not exceed
(A) 180
(B) 200
(C) 300
(D) 350
Answer: Option D
Question No. 157
Pick up the correct statement from the following:
(A) Tacking rivets are used if the minimum distance between centres of two adjacent rivets
exceeds 12 t or 200 mm, whichever is less
(B) Tacking rivets are not considered to calculate stress
(C) Tacking rivets are provided throughout the length of a compression member composed of
two components back to back
(D) All the above
Answer: Option D
Question No. 158
Lug angles
(A) Are used to reduce the length of connection
(B) Are unequal angles
(C) Increases shear lag
(D) All the above
Answer: Option A
Question No. 159
The Indian standard code which deals with steel structures, is
(A) IS : 875
(B) IS : 800
(C) IS : 456
(D) IS : 1893
Answer: Option B
Question No. 160
Under a concentrated load, bearing stress fb in a beam is given by (where b is the length of the
bearing plate and h is the depth of the root of the fillet).
(A) fb = W/(b + h tw
(B) fb = W/(b + 2h tw
(C) fb = W/(b + 2h tw
(D) fb = W/(b + h tw
Answer: Option B
Question No. 161
When the axis of load lies in the plane of rivet group, then the rivets are subjected to
(A) Only shear stresses
(B) Only tensile stresses
(C) Both (A) and (B)
(D) None of the above
Answer: Option A
Question No. 162
For double angles carrying tension, placed back to back and connected to either side of the gusset
plate, the sectional area of the section, is equal to cross sectional area of
(A) The section
(B) The section plus area of rivet holes
(C) The section minus area of rivet holes
(D) The section multiplied by the area of the rivet hole
Answer: Option C
Question No. 163
The beam outside a wall upto floor level above it, is known as
(A) Rafter
(B) Purlin
(C) Spandrel beam
(D) Lintel
Answer: Option C
Question No. 164
In the cross-section of a weld, throat is the
(A) Minimum dimension
(B) Average dimension
(C) Maximum dimension
(D) None of the above
Answer: Option A
Question No. 165
The rivets which are heated and then driven in the field, are known
(A) Power driven shop rivets
(B) Power driven field rivets
(C) Hand driven rivets
(D) Cold driven rivets
Answer: Option B
Question No. 166
If fbt and fc
are the co-existent bending tensile stress and shear stress in a member, the equivalent
stress fc
is
(A) fbt² + fc
²)
(B) fbt² + ½fc
²)
(C) fbt² + 3fc
²)
(D) fbt² - 3fc
²)
Answer: Option C
Question No. 167
According to IS: 800, in the Merchant Rankine formula the value of imperfection index (n) is
(A) 1.0
(B) 1.4
(C) 1.8
(D) 2.0
Answer: Option B
Question No. 168
When a large value of radius of gyration is not required
(A) Channels are placed back to back
(B) Channel flanges are kept inward
(C) Channel flanges are kept outward
(D) None of these
Answer: Option B
Question No. 169
The ratio of hydrostatic stress to the volumetric strain within the elastic range, is called
(A) Modulus of elasticity
(B) Shear modulus of elasticity
(C) Bulk modulus of elasticity
(D) All the above
Answer: Option D
Question No. 170
Minimum thickness of web in a plate girder, when the plate is accessible and also exposed to
weather, is
(A) 5 mm
(B) 6 mm
(C) 8 mm
(D) 10 mm
Answer: Option B
Question No. 171
If d is the distance between the flange angles, the vertical stiffeners in plate girders without
horizontal stiffeners, are spaced at a distance not less than
(A) 0.15 d
(B) 0.22 d
(C) 0.33 d
(D) 0.44 d
Answer: Option C
Question No. 172
Long column is one
(A) Which is more than 3 m long
(B) Whose lateral dimension is less than 25 cm
(C) Which is free at its top
(D) Which has a ratio of effective length and least lateral dimension more than 15
Answer: Option D
Question No. 173
To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall
be
(A) 1
(B) 2
(C) 3
(D) 4
Answer: Option B
Question No. 174
When the length of a tension member is too long
(A) A wire rope is used
(B) A rod is used
(C) A bar is used
(D) A single angle is used
Answer: Option C
Question No. 175
In factory buildings, the horizontal beams spanning between the wall columns supporting a wall
covering, are called
(A) Stringers
(B) Trimmers
(C) Girts
(D) Lintels
Answer: Option C
Question No. 176
The minimum thickness of plates in a steel stack should be
(A) 4 mm
(B) 5 mm
(C) 6 mm
(D) 8 mm
Answer: Option C
Question No. 177
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: Option B
Question No. 178
A structural member subjected to tensile force in a direction parallel to its longitudinal axis, is
generally known as
(A) A tie
(B) A tie member
(C) A tension member
(D) All the above
Answer: Option D
Question No. 179
Compression force in two end posts, the pin of a rocker bearing in a bridge is designed for
(A) Bearing and shear
(B) Bending and shear
(C) Bearing and bending
(D) Bearing, shear and bending
Answer: Option D
Question No. 180
According to the Unwin's formula, if is thickness of the plate in mm, the nominal diameter of
the rivet, is
(A) d = 1.91 t
(B) d = 1.91 t2
(C) d = 1.91 t
(D) d = 1.91 t
Answer: Option C
Question No. 181
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
(A) 10 tonnes
(B) 12 tonnes
(C) 15 tonnes
(D) 18 tonnes
Answer: Option C
Question No. 182
The ratio of plastic section modulus to elastic section modulus
(A) Is equal to 1
(B) Is always less than 1
(C) Is always greater than 1
(D) Can be less than 1
Answer: Option C
Question No. 183
Bulb angles are used in
(A) Column building
(B) Bridge building
(C) Ship building
(D) Water tank building
Answer: Option C
Question No. 184
The diameter of a bolt hole is taken as the nominal diameter of the bolt plus
(A) 1.0 mm
(B) 1.2 mm
(C) 1.4 mm
(D) 1.6 mm
Answer: Option D
Question No. 185
The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible
for cleaning and repainting, should be:
(A) 4.5 mm
(B) 6 mm
(C) 8 mm
(D) 10 mm
Answer: Option C
Question No. 186
For determination of allowable stress in axial compression, Indian Standard Institution has
adopted
(A) Euler's formula
(B) Rankine formula
(C) Perry Robertson formula
(D) Secant formula
Answer: Option D
Question No. 187
Rolled steel beams are:
(A) Mainly used to resist bending stress
(B) Used as independent sections to resist compressive stress
(C) Used as independent sections to resist tensile stress
(D) All the above
Answer: Option D
Question No. 188
When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be
the one which
moment in any rivet.)
(A) Is at the maximum distance from CG of the rivet group
(B) Is at the minimum distance from CG of the rivet group
(C) Gives the maximum angle between the two forces Fa and Fm
(D) Gives the minimum angle between the two forces Fa and Fm
Answer: Option D
Question No. 189
According to IS : 800 - 71, the minimum thickness of a vertically stiffened web plate, shall not be
less than
(A) d/85
(B) d/200
(C) d/225
(D) d/250
Answer: Option D
Question No. 190
A web plate is called unstiffened if the ratio of clear depth to thickness is less than
(A) 35
(B) 50
(C) 65
(D) 85
Answer: Option D
Question No. 191
A butt weld is specified by
(A) Effective throat thickness
(B) Plate thickness
(C) Size of weld
(D) Penetration thickness
Answer: Option A
Question No. 192
The most economical section for a column, is
(A) Rectangular
(B) Solid round
(C) Flat strip
(D) Tubular section
Answer: Option D
Question No. 193
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: Option A
Question No. 194
If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be
(A) 40 mm
(B) 60 mm
(C) 80 mm
(D) 100 mm
Answer: Option B
Question No. 195
The minimum edge distance of a rivet line connecting two or more plates, is kept equal to 37 mm
plus (where t is the thickness in mm of the thinner outside plate).
(A) 2 t
(B) 4 t
(C) 6 t
(D) 8 t
Answer: Option B
Question No. 196
For simply supported beams, the maximum permitted deflection, is
(A) 1/325 of the span
(B) 1/350 of the span
(C) 1/375 of the span
(D) 1/400 of the span
Answer: Option A
Question No. 197
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: Option B
Question No. 198
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 the above
Answer: Option D
Question No. 199
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: Option C
Question No. 200
As per IS : 875, for the purposes of specifying basic wind velocity, the country has been divided
into
(A) 4 zones
(B) 5 zones
(C) 6 zones
(D) 7 zones
Answer: Option C
Question No. 201
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) None of these
Answer: Option D
Question No. 202
For a single section used as a tension member, the given area is assumed
(A) 20% to 30% in excess of the net area
(B) 30% to 40% in excess of the net area
(C) 40% to 50% in excess of the net area
(D) 50% to 60% in excess of the net area
Answer: Option C
Question No. 203
Study the following statements.
(i) Top lateral bracing prevents the sides-way buckling of the chord.
(ii) Sway bracing keeps the rectangular shape of the bridge cross-section.
(iii) Sway bracing transfers the load from top of end posts to bearings.
The correct answer is
(A) Only (i)
(B) Both (i) and (ii)
(C) Both (i) and (iii)
(D) All (i), (ii) and (iii)
Answer: Option B
Question No. 204
The effective length of a weld, is taken as the actual length
(A) Minus the size of weld
(B) Minus twice the size of weld
(C) Plus the size of weld
(D) Plus twice the size of weld
Answer: Option B
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