287 + Mcqs in Design of Steel Structures Page 6 McqOptions

251.	In a truss girder of a bridge, a diagonal consists of mild steel flat 4001.S.F. and carries a pull of 80 tonnes. If the gross-diameter of the rivet is 26 mm, the number of rivets required in the splice, is
A.	6
B.	7
C.	8
D.	9
Answer» D. 9

Discussion

252.	A fillet weld whose axis is parallel to the direction of the applied load, is known as
A.	Diagonal filler weld
B.	End fillet weld
C.	Side fillet weld
D.	All the above
Answer» D. All the above

Discussion

253.	As compared to field rivets, the shop rivets are
A.	Stronger
B.	Weaker
C.	Equally strong
D.	Any of the above
Answer» B. Weaker

Discussion

254.	Stiffeners are used in a plate girder
A.	To reduce the compressive stress
B.	To reduce the shear stress
C.	To take the bearing stress
D.	To avoid bulking of web plate
Answer» E.

Discussion

255.	On eccentrically loaded columns, the equivalent axial load may be obtained by
A.	Adding the axial load, eccentric load, the product of the bending moment due to eccentric load and the appropriate bending factor
B.	Adding the axial load and eccentric load and subtracting the product of bending moment and appropriate bending factor
C.	Dividing the sum of axial load and eccentric load by the product of the bending moment and appropriate bending factor
D.	None of these
Answer» B. Adding the axial load and eccentric load and subtracting the product of bending moment and appropriate bending factor

Discussion

256.	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» C. Decrease in thickness

Discussion

257.	For the economical design of a combined footing to support two equal column loads, the projections of beams in lower tier are kept such that bending moment under column is equal to
A.	Bending moment at the centre of the beam
B.	Half the bending moment at the centre of the beam
C.	Twice the bending moment at the centre of the beam
D.	None of these
Answer» B. Half the bending moment at the centre of the beam

Discussion

258.	When the upper column does not provide full bearing area over lower column, the column splice is provided with the following assumption
A.	Bearing plate is assumed as a short beam to transmit the axial load to the lower column section
B.	Axial load is assumed to be taken by flanges
C.	Load transmitted from the flanges of upper column and reactions from the flanges of lower columns are equal and form a couple
D.	All the above
Answer» E.

Discussion

259.	Compression members composed of two channels back-to-back and separated by a small distance are connected together by riveting so that the minimum slenderness ratio of each member between the connections, does not exceed
A.	40
B.	50
C.	60
D.	70
Answer» B. 50

Discussion

260.	Lug angle is
A.	Used with single angle member
B.	Used with single angle member
C.	Used with channel member
D.	All the above
Answer» E.

Discussion

261.	The statical method of plastic analysis satisfies
A.	Equilibrium and mechanism conditions
B.	Equilibrium and plastic moment conditions
C.	Mechanism and plastic moment conditions
D.	Equilibrium condition only
Answer» C. Mechanism and plastic moment conditions

Discussion

262.	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» C. Three dimensional

Discussion

263.	The bracing provided in the plane of end posts is called
A.	Sway bracing
B.	Portal bracing
C.	Top lateral bracing
D.	Bottom lateral bracing
Answer» C. Top lateral bracing

Discussion

264.	A beam may be designed as a cased beam if
A.	Section is of double open channel form with the webs not less than 40 mm apart
B.	Overall depth and width of the steel section do not exceed 750 and 450 mm respectively
C.	Beam is solidly encased in concrete with 10 mm aggregate having 28 days strength 160 kg/cm2
D.	All the above
Answer» E.

Discussion

265.	A column splice is used to increase
A.	Length of the column
B.	Strength of the column
C.	Cross-sectional area of the column
D.	None of these
Answer» B. Strength of the column

Discussion

266.	The bracing between two columns of a steel tank will be designed to resist
A.	Horizontal shear due to wind or earthquake only
B.	Horizontal, shear due to wind or earthquake + 2.5% of column loads
C.	Column loads + 2.5% of horizontal shear due to wind or earthquake
D.	Column loads + full horizontal shear due to wind or earthquake
Answer» C. Column loads + 2.5% of horizontal shear due to wind or earthquake

Discussion

267.	The net area of round bars to resist the tension, is the area of cross section at
A.	Mid-section
B.	Root of the thread
C.	Difference of (a) and (b)
D.	None of these
Answer» C. Difference of (a) and (b)

Discussion

268.	For eccentrically loaded columns, the bending factor is
A.	Cross-sectional area of column/Radius of gyration
B.	Radius of gyration/Cross-sectional area of column
C.	Cross-sectional area of column/Section modulus of the section
D.	Section modulus of the section/Cross-sectional area of column
Answer» D. Section modulus of the section/Cross-sectional area of column

Discussion

269.	The risk coefficient k, depends on
A.	Mean probable design life of structures
B.	Basic wind speed
C.	Both (A) and (B)
D.	None of the above
Answer» D. None of the above

Discussion

270.	The stress in the wall of a thin cylinder subjected to internal pressure, is
A.	Hoop compression
B.	Shear
C.	Torsional shear
D.	Hoop tension
Answer» E.

Discussion

271.	The most commonly used sections in lateral system to carry shear force in built up columns, are
A.	Rolled steel flats
B.	Rolled angles
C.	Rolled channels
D.	All the above
Answer» E.

Discussion

272.	Shear buckling of web in a plate girder is prevented by using
A.	Vertical intermediate stiffener
B.	Horizontal stiffener at neutral axis
C.	Bearing stiffener
D.	None of the above
Answer» B. Horizontal stiffener at neutral axis

Discussion

273.	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
A.	The neutral axis of the section
B.	2/3rd of the depth of the neutral axis from the compression flange
C.	2/5th of the depth of the neutral axis from the compression flange
D.	2/5th of the height of the neutral axis from tension flange
Answer» D. 2/5th of the height of the neutral axis from tension flange

Discussion

274.	The moment of the couple set up in a section of a beam by the longitudinal compressive and tensile force, is known as
A.	Bending moment
B.	Moment of resistance
C.	Flexural stress moment
D.	None of these
Answer» C. Flexural stress moment

Discussion

275.	The maximum spacing of vertical stiffeners is
A.	1.33 d
B.	1.25 d
C.	1.5 d
D.	1.75 d
Answer» D. 1.75 d

Discussion

276.	The strength of a riveted lap joint is equal to its
A.	Shearing strength
B.	Bearing strength
C.	Tearing strength
D.	Least of (a), (b) and (c)
Answer» E.

Discussion

277.	When two plates are placed end to end and are joined by two cover plates, the joint is known as
A.	Lap joint
B.	Butt joint
C.	Chain riveted lap joint
D.	Double cover butt joint
Answer» E.

Discussion

278.	The mechanism method and the statical method give
A.	Lower and upper bounds respectively on the strength of structure
B.	Upper and lower bounds respectively on the strength of structure
C.	Lower bound on the strength of structure
D.	Upper bound on the strength of structure
Answer» C. Lower bound on the strength of structure

Discussion

279.	The spans are considered approximately equal if the longest span does not exceed the shortest span by more than
A.	5 %
B.	10 %
C.	15 %
D.	20 %
Answer» D. 20 %

Discussion

280.	Minimum pitch provided in riveted steel tanks is
A.	1.5 d
B.	2.0 d
C.	2.5 d
D.	3.0 d
Answer» E.

Discussion

281.	To keep the intensity of bearing pressure between the column base and concrete compressive and to vary from zero to 2P/BL, the ratio of the moment M to the axial load P should be
A.	L/2
B.	L/3
C.	L/4
D.	L/6
Answer» E.

Discussion

282.	The effective length of a battened column is increased by
A.	5 %
B.	10 %
C.	15 %
D.	20 %
Answer» C. 15 %

Discussion

283.	When a tension member is made of four angles with a plate as a web, the allowance for holes is made as
A.	Two holes for each angle and one hole for the web
B.	One hole for each angle and one hole for the web
C.	One hole for each angle and two holes for the web
D.	Two holes for each angle and two holes for the web
Answer» D. Two holes for each angle and two holes for the web

Discussion

284.	Load factor is
A.	Always equal to factor of safety
B.	Always less than factor of safety
C.	Always greater than factor of safety
D.	Sometimes greater than factor of safety
Answer» D. Sometimes greater than factor of safety

Discussion

285.	The number of seismic zones in which the country has been divided is
A.	3
B.	5
C.	6
D.	7
Answer» C. 6

Discussion

286.	Allowable working stress corresponding to the slenderness ratio of double angles placed back to back and connected to one side of a gusset plate, is reduced to
A.	50 %
B.	60 %
C.	70 %
D.	80 %
Answer» E.

Discussion

287.	The web crippling due to excessive bearing stress can be avoided by
A.	Increasing the web thickness
B.	Providing suitable stiffeners
C.	Increasing the length of the bearing plates
D.	None of the above
Answer» D. None of the above

Discussion

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A&nbsp;fillet&nbsp;weld&nbsp;whose&nbsp;axis&nbsp;is&nbsp;parallel&nbsp;to&nbsp;the&nbsp;direction&nbsp;of&nbsp;the&nbsp;applied&nbsp;load,&nbsp;is&nbsp;known&nbsp;as

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If the thickness of a structural member is small as compared to its length and width, it is classified as

The bracing provided in the plane of end posts is called

A beam may be designed as a cased beam if

A column splice is used to increase

The bracing between two columns of a steel tank will be designed to resist

The net area of round bars to resist the tension, is the area of cross section at

For eccentrically loaded columns, the bending factor is

The risk coefficient k, depends on

The stress in the wall of a thin cylinder subjected to internal pressure, is

The most commonly used sections in lateral system to carry shear force in built up columns, are

Shear buckling of web in a plate girder is prevented by using

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 moment of the couple set up in a section of a beam by the longitudinal compressive and tensile force, is known as

The maximum spacing of vertical stiffeners is

The strength of a riveted lap joint is equal to its

When two plates are placed end to end and are joined by two cover plates, the joint is known as

The mechanism method and the statical method give

The spans are considered approximately equal if the longest span does not exceed the shortest span by more than

Minimum pitch provided in riveted steel tanks is

The effective length of a battened column is increased by

When a tension member is made of four angles with a plate as a web, the allowance for holes is made as

Load factor is

The number of seismic zones in which the country has been divided is

Allowable working stress corresponding to the slenderness ratio of double angles placed back to back and connected to one side of a gusset plate, is reduced to

The web crippling due to excessive bearing stress can be avoided by