Design of Steel Structures Objective Type Questions and Answers

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(21) Economical depth of a plate girder corresponds to

[A] minimum weight

[B] minimum depth

[C] maximum weight

[D] minimum thickness of web

Answer: minimum weight

(22) The slenderness ratio of lacing bars should not exceed

[A] 100

[B] 120

[C] 145

[D] 180

Answer: 145

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(23) The overlap of batten plates with the main members in welded connections should be more than where t = thickness of the batten plate

[A] 3t

[B] 4t

[C] 6t

[D] 8t

Answer: 4t

(24) The effective length of a battened column is increased by

[A] 5%

[B] 10%

[C] 15%

[D] 20%

Answer: 10%

(25) Battening is preferable when the

i) column carries axial load only

ii) space between the two main components is not very large

iii) column is eccentrically loaded The correct answer is

[A] only (i)

[B] only (iii)

[C] (i) and (ii)

[D] (ii) and (iii)

Answer: (i) and (ii)

(26) Angle of inclination of the lacing bar with the longitudinal axis of the column should preferably be between

[A] 10° to 30°

[B] 30° to 40°

[C] 40° to 70°

[D] 90°

Answer: 40° to 70°

(27) Lacing bars in a steel column should be designed to resist

[A] bending moment due to 2.5% of the column load

[B] shear force due to 2.5% of the column load

[C] 2.5% of the column load

[D] both (a) and (b)

Answer: shear force due to 2.5% of the column load

(28) 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: permitted at start and end of lacing system only

(29) If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be

[A] 40mm

[B] 60mm

[C] 80mm

[D] 100mm

Answer: 60mm

(30) The best arrangement to provide unified behaviour in built up steel columns is by

[A] lacing

[B] battening

[C] tie plates

[D] perforated cover plates

Answer: lacing

31 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: 1.4

32 The maximum slenderness ratio of a steel column, the design of which is governed by wind or seismic forces is

[A] 150

[B] 180

[C] 250

[D] 350

Answer: 250

33 The maximum slenderness ratio of a compression member carrying both dead and superimposed load is

[A] 180

[B] 200

[C] 250

[D] 350

Answer: 180

34 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: 1.1 L

35 According to IS Specifications, the effective length of a column effectively held in position at both ends and restrained in direction at one end is taken as

[A] 0.67 L

[B] 0.8 L

[C] L

[D] 1.5 L

Answer: 0.8 L

36 The slenderness ratio of a column supported throughout its length by a masonry wall is

[A] zero

[B] 10

[C] 100

[D] infinity

Answer: zero

37 A circular column section is generally not used in actual practice because

[A] it is uneconomical

[B] it cannot carry the load safely

[C] it is difficult to connect beams to the round sections

[D] all of the above

Answer: it is difficult to connect beams to the round sections

38 According to IS Specifications, the maximum pitch of rivets in compression is where t is thickness of thinnest outside plate or angle

[A] lesser of 200 mm and 12 t

[B] lesser of 200 mm and 161

[C] lesser of 300 mm and 32 t

[D] lesser of 3 00 mm and 24 t

Answer: lesser of 200 mm and 12 t

39 The actual thickness of butt weld as compared to the thickness of plate is usually

[A] more

[B] less

[C] equal

[D] None of these

Answer: more

40 A butt weld is specified by

[A] effective throat thickness

[B] plate thickness

[C] size of weld

[D] penetration thickness

Answer: effective throat thickness

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Design of Steel Structures Quiz | Design of Steel Structures Objective Type Questions and Answers

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