objective of civil engineering of steel structure

Choose the correct options given in questions nos 1 to 157.

1. The advantage of steel structure is

(a) needs less space

(b) quality is assured

(d) all the above

Ans-D

2. Weldability of steel is enhanced by alloying it with ______.

(a) carbon

(b) sulphur

(d) nickel

Ans-b

3. Irrespective of grade, the following properties of steel are same

(a) unit weight

(b) modules of elasticity

(d) all the above

Ans-D

4. The lightest I-section for the same depth is

(a) ISMB

(b) ISLB

(d) ISWB

Ans-c

5. The heaviest I-section for the same depth is

(a) ISMB

(b) ISJB

(d) ISHB

Ans-D

6. A channel section has

(a) two webs one flange

(b) one web two flanges

(d) two webs and two flanges

Ans-b

7. Rolled steel tubes are referred by their

(a) outer diameters

(b) inner diameter

(d) outer radius

Ans-b

8. Maximum thickness of rolled steel strip are

(a) 2.45 mm

(b) 4.5 mm

(d) 8.0 mm

Ans-b

9. Minimum thickness of rolled steel flats available is

(a) 5 mm

(b) 6 mm

(d) 12 mm

Ans-a

10. Maximum width of steel plates manufactured are

(a) 1 m

(b) 1.5 m

(d) 2.5 m

Ans- D

11. IS 800–2007 recommends use of ______ connections as far as possible.

(a) riveted

(b) bolted

(d) any of the above

Ans-c

12. Limit state of strength includes

(a) loss of equilibrium of whole or part of structure

(b) fracture by excessive deformations

(d) all the above

Ans-d

13. Which one of the following is not limit state of serviceability?

(a) Vibration

(b) Corrosion

(d) Fire

Ans-c

14. Which one of the following is not a variable action?

(a) Handling and erection loads

(b) Wind loads

(d) Self-weight

Ans-d

15. Characteristic actions are those which do not exceed ______ percent probability.

(a) 5%

(b) 10%

(d) 15%

Ans-a

16. Partial safety factors for dead load and live load for limit state of strength are

(a) 1.5 and 1.5

(b) 1.5 and 1.0

(d) 1.0 and 1.05

Ans-a

17. Partial safety factor for limit state of serviceability for live load and dead load are

(a) 1.5 and 1.3

(b) 1.5 and 1.2

(d) 1.0 and 1.0

Ans-d

18. Partial safety factor for shop welding and field welding are

(a) 1.10 and 1.25

(b) 1.25 and 1.25

(d) 1.5 and 1.5

Ans-c

19 Size of rivet hole is kept ______ more them size of rivet

(a) 1 to 1.5 mm

(b) 1.5 to 2 mm

(d) 3–4.5 mm

Ans-b

20. The effective diameter of a rivet is taken as

(a) nominal diameter of rivet

(b) rivet hole diameter

(d) rivet hole diameter –1.5 mm

Ans-b

21. Which one of the following is not a type of bolt?

(a) Black bolt

(b) Turned bolt

(d) Hot rolled bolt.

Ans-d

22. The yield strength and ultimate strength of M20 bolts are

(a) 20 N/mm2 and 28 N/mm2

(b) 200 N/mm2 and 280 N/mm2

(d) 240 N/mm2 and 400 N/mm2

Ans-d

23. Actual dimension of turned/finished bolts is

(a) nominal diameter –1.2 to 1.3 mm

(b) nominal diameter

(d) diameter of bolt hole

Ans-c

24. To connect members subjected to dynamic loads which one of the following type of bolts is

preferable?

(a) black bolts

(b) turned bolts

(d) both (b) and (c) types

Ans-c

25. The successful introduction of ______ bolts resulted into replacement of rivets.

(a) black bolt

(b) turned bolt

(d) all of the above

Ans-c

26. The following types of bolts may be classified as bearing types bolts

(a) black bolt

(b) turned bolt

(d) both black and turned bolt

Ans-d

27. Which one of the following is not the advantage of HSFG bolt?

(a) No slip takes place in the joint.

(b) Bolts are not subjected to shearing and bearing stresses.

(d) Less stress concentration.

Ans-c

28. Which one of the following is not an advantage of bolted connection over welded connection?

(a) Making joint is noiseless.

(b) Connection can be made easily.

(d) Alterations in connections can be made easily in the field.

Ans-d

29. If p is the pitch, d is nominal diameter and d¢ bolt hole diameter, minimum pitch is

(a) 3d

(b) 3d¢

(d) 2.5d¢

Ans-c

30. If t is the thickness of thinner plate in a bolted connection of tension member, pitch shall not be

more than the

(a) 16t or 200 mm whichever is less

(b) 16t or 200 mm whichever is more

(d) 12t or 150 mm whichever is more

Ans-a

31. 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

(a) 16t or 200 mm whichever is less

(b) 16t or 200 mm whichever is more

(d) 12t or 180 mm whichever is less

Ans-c

32. Minimum edge distance, in case of hand flame cut edges, shall not be less than ______times bolt

hole diameter.

(a) 1.2

(b) 1.5

(d) 1.8

Ans-c

33. In case of planed edges, minimum edge distance shall not be less than ______ times bolt hole

diameter.

(a) 1.25

(b) 1.5

(d) 2.0

Ans-b

34. In double angle tension member of a truss tacking bolts are provided at a distance not exceeding

(a) 600 mm

(b) 800 mm

(d) 1200 mm

ans-c

35. In a compression member of a truss, consisting of double angle, tacking bolts should be provided

at a distance not more than

(a) 600 mm

(b) 800 mm

(d) 1200 mm

ans-a

36. The assumptions made in the design of bearing bolted connections are

(i) the friction between the plates is negligible

(ii) the shear is uniform over the cross section

(iii) bolts in a group subject to direct load share the load equally

(a) (i) and (ii) are correct

(b) (ii) and (iii) are correct

(d) all the three are correct

ans-d

37. The principle to be observed in bolted connection are:

(i) the centre of gravity of bolts should coincide with the centre of gravity of connected members

(ii) the length of connection should be kept as small as possible

(a) only (i) is correct

(b) only (ii) correct

(d) none is correct

ans-c

38. Minimum edge distances specified by the code should be maintained to avoid

(a) rupture of plate

(b) shearing of plate

(d) both (b) and

ans-d

40. In a width of plate b, thickness t, number of bolts n of diameter d, with hole diameter do net

effective area is

(a) (b – ndo

) t

(b) (b – nd) t

) t

(d) (b – l.ld) t

ans-a

41. In case of standard bolts of diameter d, the cross-sectional area at threads is approximately

(a) 0.78 p/n d

(b) 0.85 p/n d

(d) 0.95 p/n d

ans-a

42. In a bolt of diameter d, effective area for resisting single shear is

(a) 0.78 d

(b) 0.85 d

(d) d

ans-a

43. In double shear a bolt of diameter d has effective area resisting shear is

(a) 1.5 d

(b) 1.6 d

(d) 2.0 d

ans-c

44. The code does not suggests reduction factor for shear capacity in the case

(a) if the joint is too long

(b) if number of bolts exceed a specified number

(d) if packing plate thickness exceeds 6 mm

ans-b

45. If packing plate thickness tpk exceeds 6 mm the shear capacity is to be reduced by a factor

(a) 1 – 0.25 tpk

(b) 1 – 0.100 tpk

(d) 1 – 0.01 tpk

ans-a

46. With usual notations, bearing capacity of bolt is given by

(a) 1.5 kb dt fu

(b) 2.5 kb dt fu

(d) 2.5 kb dt fy

ans-b

54. For HSFG bolts, partial safety factor designed at service load and at ultimate load are

respectively

(a) 1.10 and 1.25

(b) 1.2 and 1.4

(d) 1.25 and 1.5

ans-a

55. HSFG bolts transfer load mainly due to

(a) friction

(b) shearing

(d) none of the above

ans-a

56. Prying forces should be considered in designing

(a) black bolts

(b) turned bolts

(d) HSFG bolts

ans-d

57. For connecting circular tubes in tension, the best connection is by

(a) riveting

(b) bolting

(d) welding

ans-d

58. Under fatigue stresses, which one of the following joint fails earlier?

(a) black bolted

(b) turned bolted.

(d) welded

ans-d.

59. If a plate with small hole is kept over another plate and the entire hole is filled with weld

material, the welded joint is known as

(a) fillet weld

(b) butt weld

(d) slot weld

ans-c

60. The minimum length of butt weld shall be ______ times the size of weld

(a) 4

(b) 5

(d) 8

ans-a

61. If intermittent butt welding is used, the space between two welds should not be more than ______

times the thickness of the thinner member connected.

(a) 12

(b) 16

(d) 24

ans-b

62. For connecting 10 to 20 mm plates minimum size of fillet weld is

(a) 5 mm

(b) 6 mm

(d) 10 mm

ans-a

63. In showing welded connection the length of the weld shown should be

(a) effective length only

(b) effective length + size of weld

(d) effective length + 4 × size of weld

ans-a

64. When welding is carried out, the length of the weld should be

(a) length shown in drawing

(b) length shown in drawing + size of weld

(d) length shown in drawing + 4 × size of weld

ans-c

65. In lap joints with welding, lap should not be less than

(a) 4 × t or 40 mm

(b) 5 t or 50 mm

(d) 100 mm

ans-a

66. If t is the thickness of thinner plate jointed by intermittent weld, minimum spacing recommended

in tension and compression joints are respectively

(a) 12 t and 16 t

(b) 16 t and 12 t

(d) 20 t and 16 t

ans-b

68. If a fillet weld is to the square edge, the size of weld shall be at least ______ less than the edge

thickness

(a) 1.5 mm

(b) 2.0 mm

(d) 3.0 mm

ans-a

69. If fillet weld is to the rounded toe of thickness t, a rolled steel section, the size of weld generally

not to exceed

(a) t – 1.5 mm

(b) t – 2.0 mm

(d) 3/4 t

ans-d

76. In the design of a connection of tension member to a gusset plate, the principle to be followed is

(a) section should be compact

(b) as large portion of it as is possible is connected

(d) all the above

ans-d

77. The design strength of tension member is

(a) design strength of gross section due to yielding

(b) rupture strength of section

(d) lowest of the above

ans-d

79. 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.

(a) more

(b) less

(d) may be any one of above depending

upon the ratio of length of the legs

ans-b

80. In a roof truss a member normally acting as tension member but occasionally subjected to

compression due to wind load, slenderness ratio should not exceed

(a) 150

(b) 250

(d) 450

ans-c

81. The following are the statements about lug angle used to connected heavily loaded tension

member to gusset plates.

(i) The length of end connection is reduced

(ii) By using lug angles there will be saving in the gusset plate

(iii) Cost of connection increases due to additional fasteners and angle required

(a) only (i) and (ii) are correct.

(b) only (i) and (iii) are correct.

(d) all the three are correct

ans-d.

82. Which one of the following is not a correct statement about lug angle connection?

(a) By using lug angle, there will be saving in gusset plate.

(b) The connection of lug angle to main member shall preferably start in advance of the member to

the gusset plate.

(d) Maximum of five bolts should be used in the connection

ans-d.

83. Load carrying capacity of compression member depends upon

(a) cross-sectional area

(b) end condition

(d) all the above

ans-d

84. IS 800–2007, divides sections into ______ number of buckling classes.

(a) 3

(b) 4

(d) 6

ans-b

85. The most economical section for a compression member is

(a) rectangular

(b) I-shaped

ans-d

86. For compression members most preferable I-section is

(a) light beam (b) junior beam

ans-d

87. Lacing and battening of columns is to increase ______ of column.

(a) sectional area

(b) least radius of gyration

(d) none of the above

ans-b

88. In case of bolted lacing, the width of lacing bars shall be ______ times the nominal diameter of

the bolt.

(a) 2

(b) 3

(d) 6

ans-b

91. Maximum spacing of lacing bars shall be such that the maximum slenderness of the main member

between consecutive lacing connection is not more than

(a) 30

(b) 40

(d) 60

ans-c

92. Lacing shall be designed to resist transverse shear Vt equal to

(a) 2.5% of P

(b) 4.0% of P

(d) 10.0% of P

where P is axial compression.

ans-a

93. For welded and double laced joints, effective length of lacing is ______ times the actua1 1ength.

(a) 0.5

(b) 0.6

(d) 0.85

ans-c

94. The slenderness ratio of lacing bars should not exceed

(a) 105

(b) 125

(d) 160

ans-c

95. The effective slenderness ratio of laced columns shall be taken as ______ times the actual

maximum slenderness ratio, in order to account for shear deformation effect.

(a) 1.05

(b) 1.10

(d) 1.20

ans-b

96. The number of battens should be such that the member is divided into not less than ______ bays.

(a) 3

(b) 4

(d) 6

ans-a

97. The effective slenderness ratio of battened columns shall be taken as ______ times the maximum

slenderness ratio of the column

(a) 1.05

(b) 1.10

(d) 1.20

ans-b

101. It is recommended that columns should preferably spliced at

(a) point of maximum shear

(b) point of zero shear

(d) anywhere

ans-c

102. In a column splice, if ends are milled, the connection and splice plates may be designed for only

______ percent of axial load.

(a) 50

(b) 60

(d) 80

ans-a

103. When the two columns to be spliced are of slightly different size

(a) milled ends are provided

(b) filler plates are used

(d) milled end and bearing plated are used

ans-b

104. Column splice plates may be assumed to act as columns with slenderness ratio

(a) zero

(b) 40

(d) 120

ans-a

105. The beam sections in which the extreme fibre in compression can yield stress, but cannot

develop the plastic moment of resistance, due to local buckling are classified as

(a) plastic sections

(b) compact sections

(d) slender sections

ans-c

106. 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

(d) slender section

ans-d

107. The shear area of a rolled steel I-section for minor axis bending is

(a) h tw

(b) b t

(d) h t

where

h = overall depth

b = breadth

tw = thickness of web

f = thickness of flange

ans-c

110. Minimum cover beyond the edges of steel beans in a grillage foundation should be

(a) 25 mm

(b) 50 mm

(d) 100 mm

ans-d

111. In a grillage foundation a minimum clear space of ______ should be maintained

(a) 50 mm

(b) 75 mm

(d) 125 mm

ans-b

112. Which one of the following is not a flexible connection of beams?

(a) Web angle connection

(b) framed connection

(d) stiffened seated connection

ans-a

118. In a plate girder of depth d, if one horizontal stiffener is to be provided, it should be at ______

below compression flange.

(a) 0.2 d

(b) 0.25 d

(d) 0.5 d

ans-a

119. In a plate girder, if two horizontal stiffeners are to be used they should be at depth ______from

compression flange.

(a) 0.2 d and 0.4 d

(b) 0.2 d and 0.5 d

(d) 0.4 d and 0.8 d

ans-b

121. Simple post-critical method may be used for finding shear buckling resistance of web in case of

plate girder

(a) without vertical stiffeners only

(b) with vertical stiffeners only

(d) with vertical and horizontal stiffeners.

ans-c

122. The following are the statements about tension field method of finding shear buckling resistance

of plate girded: which one of them is correct statement?

(a) It may be used if end and intermediate vertical stiffeners are provided.

(b) As the web begins to buckle, it loses the ability to resist diagonal compression.

(d) All the above.

ans-d

123. According to tension field method as web begins to buckle

(a) horizontal component of diagonal compression in web due to shear is resisted by flange

(b) vertical component of diagonal compression in web due to shear is resisted by vertical stiffener

(d) all the above statements are correct

ans-d

124. In designing connection between web plate and flange plate, shear stress is calculated using

moment of inertia of

(a) web plate only

(b) web plate and flange plates

(d) one flange plate only

ans-d

127. Bearing stiffeners are provided at

(i) 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)

(d) all the three

ans-c

128. Gantry girders are designed to resist

(a) vertical load from cranes

(b) longitudinal and vertical loads

(d) lateral and longitudinal loads

ans-c

129. In the design of gantry girders impact factor for vertical loads for electrically operated cranes is

taken as

(a) 10%

(b) 15%

(d) 25%

ans-d

130. In the design of hands operated gantry girders, the impact factor for vertical loads to be

considered is

(a) 10%

(b) 15%

(d) 25%

ans-a

131. In designing gantry girders impact factor for horizontal force along rails is taken as

(a) 5%

(b) 10%

(d) 25%

ans-a

134. In roof trusses bracings should be provided at top chord level in the

(a) end panels using flats

(b) end panels using angles

(d) last but one end panel using angles

ans-b

135. In roof trusses bracings should be provided at bottom chord level in the

(a) end panels using flats

(b) end panels using angles

(d) last but one panel using angles

ans-c

143. If span of a roof truss is between 15–30 m, preferable spacing is

(a) 3.0 to 4.5 m

(b) 4.5 to 6.0 m

(d) 10–12 m

ans-b

144. If span of truss is 40 m and above, preferable spacing of trusses is

(a) 4.5 to 6 m

(b) 6 to 8 m

(d) 12–15 m

ans-d

145. For spacing of trusses 3 to 4 m, purling used are

(a) angle iron with outstanding leg at top

(b) angle iron with outstanding leg at bottom

(d) I-sections

ans-a

146. For 4 to 5 m spacing of trusses purling used are

(a) angles with outstanding leg at top

(b) angles with outstanding leg at bottom

(d) I-sections

ans-c

147. 8 corrugation A.C. sheets are having width of

(a) 500 mm

(b) 660 mm

(d) 1000 mm

ans-b

148. 10 corrugation A.C. sheets have width of

(a) 600 mm

(b) 810 mm

(d) 1240 mm

ans-b

150. In A.C. sheet roofing, if slope is more than 20°, end lap should be at least

(a) 100 mm

(b) 125 mm

(d) 175 mm

ans-a

151. In A.C. sheet roofing, if slope is less than 20°, end lap should be at least

(a) 125 mm

(b) 150 mm

(d) 200 mm

ans-b

152. The A.C. sheets should be fastened to purlins by 8 mm hook bolts at a maximum pitch of

(a) 300 mm

(b) 350 mm

(d) 500 mm

ans-b

153. If 6 mm A.C. sheets are used for roofing, maximum spacing is

(a) 1.4 m

(b) 1.6 m

(d) 2.0 m

ans-a

154. If 7 mm thick A.C. sheets are used maximum spacing of J bolts is

(a) 1.4 m

(b) 1.6 m

(d) 2.0 m

ans-b

155. Unit weight of G.I. sheets is

(a) 65 N/m2

(b) 85 N/m2

(d) 125 N/m2

ans-b

156. The roof covering weight including A.C. sheets, laps, connector etc. may be taken as

(a) 100–125 N/m2

(b) 125–150 N/m2

(d) 170–200 N/m2

ans-d

157. To account for weight of electrical fixtures like lights and fans, on lower panel points of trusses

additional occasional load to be considered is

(a) 5–10 kN

(b) 10–15 kN

(d) 20–30 kN

ans-a

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Objective of Steel structures

objective of civil engineering of steel structure

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