Steel Structures Objective type Questions with Answers

Steel Structures Objective type Questions with Answers

1. In the plate girder, the vertical stiffeners are provided when the ratio of clear depth to the thickness of web exceeds.
a) 50 
b) 85
c) 65 
d) 75






1. (B) ( 85)

Solutions-
       𝑑/𝑡𝑤< 85 – No stiffener is required

      85 < 𝑑/𝑡𝑤 ≤ 200 (Vertical stiffener required)

     200 < 𝑑/𝑡𝑤 ≤ 250 (Vertical + Horizontal stiffener required)

      250 < 𝑑/𝑡𝑤 ≤ 400 ((1) Vertical + (2) Horizontal stiffener required)




2. The effective length of battened columns is increased by
a) 5% 
b) 10%
c) 15% 
d) 20%




answer-
2. (B) For battened columns effective length is increased by 10%.




3. The maximum spacing of tacking rivets is
a) 500 mm 
b) 750 mm
c) 1000 mm 
d) 1500 mm




Answer- 3. (C)
Max. Spacing between tracking rivets.
Tension – 1000 mm

compression – 600 mm




4. The economic spacing of a roof truss depends upon the ?
a) cost of purlins and cost of roof coverings
b) Cost of roof covering and dead loads
c) Dead loads and live loads
d) Live loads and cost of purlins





4. (A)
For economical spacing of trusses.
  
 t = 2P + r

P – cost of purlin
r – Cost of purlin

t = Cost of trusses



5. The maximum slenderness ratio for tension member shall not exceed
a) 180 
b) 300
c) 350 
d) 400


5. (D)

i). A member carrying compressive loads resulting from dead
loads and imposed loads.----------------------180

ii). A tension member in which stress due to loads other than wind of seismic forces ------------------------180

iii). A member subjected to compression force resulting from wind/
earthquake forces provided the deformation of such member does not adversely affect the stress in any part of the structure. -----------------------250

(iv). compression flange of a beam ----------------------  300

(v). A member normally acting as a tie a roof truss or a bracing system but subject to possible reverse of stress resulting from the action of wind of earthquake forces. ---------------350


(vi) Tension members (other than pretension members)--------- 400



6. Rolled steel sections are classified
a) Equal angles 
b) Unequal angles
c) Bulb angles 
d) All the above


ANSWER
6. (D)
Rolled steel angle sections are classified as per ISI as
• Equal angle section
• Unequal angle section
• Bulb angle

7. Ties are load carrying members of a frame which are subjected to ?
a) Transverse loads
b) Axial tension loads
c) Axial compression loads
d) Torsional loads





7. (B)
Ties – are used to carry tension load
Struts – Are used to carry compression loads.


8. In fillet weld,the weakest section is the ?
a) Smaller side of the fillet
b) Throat of the fillet
c) Side perpendicular to force
d) Side parallel to force





8. (B)
In fillet weld throat of fillet weld is assumed to resist entire load byshearing action.





9. The shape factor for a rectangular section is equal to
a) 1.00 
b) 1.50
c) 2.34 
d) 1.70






ANSWER - B (1.50) 

Design Of Steel Structures MCQ Questions & Answers For Civil Engineering

10. For steel construction where secondary effects, are considered without wind or earthquake loads the permissible stresses on the members or connections, as specified, may be exceeded.
a) 25 percent 
b) 33 percent
c) 33.33 percent 
d) 40 percent




10. (A)
For secondary effect in steel construction for members and its connection when wind or earthquake loads are not taken into account, then its permissible stresses may be exceeded by 25%



11. In calculating area to be deducted for bolts of 36 mm diameter, the diameter of the hole shall be taken as
a) 37.5 mm 
b) 36.0 mm
c) 38.0 mm 
d) 38.5 mm





11. (C)
For Rivet  

When (d<25)
d’ = d + 1.5 mm

When (d≥25)
d’ = d + 2 mm


∵ d’ = 36 + 2 = 38 mm



12. The maximum slenderness ratio of a tension member, as per the code, shall not exceed
a) 300 
b) 180
c) 400 
d) 450






12. (C)
slenderness ratio for lacing bars ≤ 145


13. As per the code, the slenderness ratio of the lacing bars for compression members should not exceed.
a) 80 
b) 100
c) 145 
d) 225





Answer -- C (  145 )


14. For field rivets the maximum permissible stresses in rivets and bolts as given in the code are reduced by
a) 5 percent 
b) 10 percent
c) 15 percent 
d) 20 percent





14. (B)
For field rivets permissible stresses are reduced by 10%.

15. As per the code, the permissible stress in axial tension in N/mm2, on the net effective area of the sections shall not exceed (where fy is the minimum yield steel in N/mm2.
a) 0.5 fy 
b) 0.6 fy

c) 0.75 fy 
d) 0.8 fy







15. (B).
Max permissible stress in
• Tension & compression - 0.6fy
• In bearing (at support) - 0.75fy

• In shearing - 0.4fy




16. The maximum center to center distance between rivets in a tension member of thickness 10 mm is.
a) 200 mm 
b) 160 mm
c) 120 mm 
d) 100 mm







16. (B)
Max center to center distance between rivers of pitch of rivet in direction of force applied
• Tension member – min of (16 t or 200 mm)

• compression member – Min of [12 t or 200 mm]
∵ 16 x 10 = 160 or 200 mm 

160 is lesser one




17. Which of the following does not describe a weld type?
a) Butt weld 
b) Plug weld
c) Zigzag weld 
d) Lap weld




17. (C)
Zigzag is not described as a weld type.


18. The type of welding used to connect two plates at a lap joint is called
a) Butt weld 
b) Plug weld
c) Plug weld 
d) Fillet weld






18. (D)
When two plates at lap joint are connected fillet weld is used.


19. A riveted joint can fail in
a) Tearing of plate only
b) Shearing of rivet only
c) Bearing of plate of rivet only
d) Any of the above






19. (D).
A rivet joint can fail due to
• Tension failure in plates
• shearing failure across one or more planes
• Bearing failure between plates and rivers.




20. The gross diameter of a 14 mm nominal diameter rivet is
a) 15.5 mm
b) 16 mm
c) 16.5 mm

d) None of the above

20 (A).
d’ = d + 1.5 (D < 25 mm)
= 14 + 1.5

= 15.5 mm




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