Structural Engineering - Online Test

Q1. Group I contains representative stress-strain curves as shown in the figure, while Group II gives the list of materials. Match the stress-strain curves with the corresponding materials. 

Answer : Option B
Explaination / Solution:
No Explaination.


Q2. The first moment of area about the axis of bending for a beam cross-section is
Answer : Option B
Explaination / Solution:

Section mod ulus, z = 1/r = A.r2/r = A.r,  i.e. Moment of Area.

Q3. The target mean strength fcm for concrete mix design obtained from the characteristic strength fck and standard deviation σ, as defined in IS:456-2000, is
Answer : Option D
Explaination / Solution:
No Explaination.


Q4. The modulus of elasticity, E = 500fck where fck is the characteristic compressive strength of concrete, specified in IS:456-2000 is based on
Answer : Option B
Explaination / Solution:
No Explaination.


Q5. The contact pressure for a rigid footing resting on clay at the centre and the edges are respectively
Answer : Option D
Explaination / Solution:



Q6. The values of axial stress (σ) in kN/m2 , bending moment (M) in kNm, and shear force (V) in kN acting at point P for the arrangement shown in the figure are respectively
 
Answer : Option B
Explaination / Solution:

Loading after removing of cable 
Axial stress = 50/(0.2×0.2) = 1250kN/m2
B.M = 50 × 3 = 150kNm
S.F = 50kN

Q7. Considering the symmetry of a rigid frame as shown below, the magnitude of the bending moment (in kNm) at P (preferably using the moment distribution method) is 

Answer : Option C
Explaination / Solution:


Axis of symmetry is passing through a column; hence it can be treated as 


Q8. A prismatic beam (as shown below) has plastic moment capacity of Mp, then the collapse load P of the beam is 

Answer : Option C
Explaination / Solution:



Q9. The tension (in kN) in a 10 m long cable, shown in the figure, neglecting its self-weight is 

Answer : Option B
Explaination / Solution:

Taking moment about Q =0 
R ×6−120 ×3 = 0 ⇒ RA =60kN
Taking moment about R = 0 
R × 3 - H × 4 = 0
H = (3/4) × 60 = 45kN



Q10. A circular raft foundation of 20 m diameter and 1.6m thick is provided for a tank that applies a bearing pressure of 110 kPa on sandy soil with Young’s modulus, E,’ = 30 MPa and Poisson’s ration, υs = 0.3. The raft is made of concrete (EC = 30 GPa and υC = 0.15) . Considering the raft as rigid, the elastic settlement (in mm) is
Answer : Option B
Explaination / Solution:

Elastic settlement of rigid footing