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Analysis and Design of Structures - MCQ from AMIE exam (Winter 2024)

1. For a compression member having the same effective length about any cross sectional axis, the most preferred section from the point of view of strength is

(i) box

(ii) I-section

(iii) circular tube*

(iv) single angle

Hint: The circular tube is the most preferred for equal effective lengths about any axis — it gives the highest buckling strength for a given cross-sectional area due to uniform radius of gyration and torsional stiffness. 

2. The ordinates of influence line diagram for bending moment has the dimension of

(a) force

(b) length

(c) force x length

(d) force/length

Hint: rdinate = (Bending moment due to unit load) 

= [Force × Length] / [Force] = [Length]. 

3. Two wheel loads 200 and 80 kN spaced 2 m apart moves on the span of girder 16 m. What is the maximum bending moment that will occur at a section 6 m from the left end?

(a) 990 kNm*

(b) 1020 kNm

(c) 900 kNm

(d) 1000 kNm

Hint: 

Case 1: 200 kN load is leading:

To get max BM, draw the influence line diagram (ILD) for BM at section 6m from left support. To do so, assume Imaginary hinge at that point and lift it by  (ab/L) amount as shown below:

ILD for that beam is shown in figure. To get max BM Place 200 kN load at C1 then 80 kN load will automatically come at point D which is at 2 m from left of 200 kN load.

y/4 = 3.75/6

y = 2.5 m

BM = ∑(Ordinate of ILD) x load
= 200 x 3.75 + 2.5 x 80
= 950 kNm

Case 2: Let 80 kN load is leading:

Proceed as above.

BM at C will come out as 990 kNm

From case 1 and 2

Max BM at C will be 990 kN.m. 

4. Which of the following is not a compression member?

(a) Strut

(b) Tie*

(c) Rafter

(d) Boom

5. Permitted maximum slenderness ratio of a steel column under dead load and live load is

(a) 180*

(b) 250

(c) 350

(d) 400

Hint:     

  • For members carrying dead and imposed loads (dead + live loads): maximum slenderness ratio λmax⁡ =180.
  • For members carrying only wind loads in addition to dead loads, higher slenderness (up to 250) may be allowed.
  • For tension members, higher slenderness limits (up to 400) apply. 

6. As per IS:800 - 1984, the ultimate load carrying capacity of tension member is

(a) 0.6 fy As*

(b) 0.67 fy As

(c) 0.75 fy As

(d) 0.85fy /As

7. The batten plates used to connect the components of a built up column are designed to resist

(a) Longitudinal shear only

(b) Transverse shear only

(c) Longitudinal shear and moment arising from transverse shear*

(d) Vertical shear only

8. The heaviest I section for same depth is

(a) ISMB

(b) ISLB

(c) ISH*

(d) ISWB

Hint: Among the given Indian Standard I-sections—ISLB (Indian Standard Light Weight Beam), ISMB (Indian Standard Medium Weight Beam), ISWB (Indian Standard Wide Flange Beam), and ISHB (Indian Standard Heavy Weight Beam)—ISHB is designed with thicker flanges and web for the same nominal depth, resulting in the highest weight per meter and greater load-carrying capacity. 

9. Lateral buckling of beam starts from top flange because of

(a) Compression in top flang*

(b) Different nature of forces in top and bottom flange

(c) Less value of shear force over cross section

(d) None of these

10. IS 800-2007 is based on

(a) Elastic Design Method

(b) Ultimate Load Method

(c) Working Stress Method

(d) Limit State Method*

Hint: 

  • IS 800:1984: Working Stress Method (WSM)/Elastic Design
  • IS 800:2007: Limit State Method (LSM) 

 ---

By amiestudycircle.com

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