# MCQs on Unsymmetrically Loaded Welded Joints

1 - Question

This set of Machine Design quiz focuses on “Unsymmetrically Loaded Welded Joints”.

Answer the question 1-7 with respect to figure 1
The two welds shown in the figure experience equal resisting force?

a) True
b) False

Explanation: As the welded joints are unsymetrically loaded hence resisting forces are different in the two welds.

2 - Question

The moment of forces about the CG is ?

a) Zero
b) Infinite
c) P₁y₁+P₂y₂
d) None of the listed

Explanation: External force passes through CG hence moment is zero.

3 - Question

Which equations can be used to find the resisting force in the two welds?

a) P=P₁+P₂
b) P₁+P₂=0
c) Both P=P₁+P₂ and P₁y₁=P₂y₂
d) P₁y₁=P₂y₂

Explanation: One equation is of equilibrium and the other conservation of moment about CG.

4 - Question

For the following welded joint l₁y₁=l₂y₂.

a) True
b) False

Explanation: P₁y₁=P₂y₂ and P₁=0.707hl₁τ and P₂=0.707hl₂τ.

5 - Question

Find the total length of weld required to with stand the load of 100kN. Permissible shear stress in weld is 70kN/mm².

a) None of the listed
b) 101.03mm
c) 202.06mm
d) 30309mm

Explanation: 100000=0.707x10xlx70.

6 - Question

Find the length of weld 2 required to with stand the load of 100kN. Permissible shear stress in weld is 70kN/mm².

a) None of the listed
b) 102.22mm
c) 132.4mm
d) 70.16mm

Explanation: By finding CG y₂=103.9mm, therefore l₁y₁=l₂y₂ and l₁+l₂=202.06mm.

7 - Question

Find the length of weld 1 required to with stand the load of 100kN. Permissible shear stress in weld is 70kN/mm².

a) None of the listed
b) 102.22mm
c) 132.4mm
d) 70.16mm

Explanation: By finding CG y₂=103.9mm, therefore l₁y₁=l₂y₂ and l₁+l₂=202.06mm.
Figure 2

Answer the following questions with respect to figure 2

8 - Question

The following welded joint is an example of

a) Eccentric Load in plane of welds
b) Axial load in plane of welds
c) Axial load in plane perpendicular to plane of welds
d) None of the mentioned

Explanation: The figure clearly depicts.

9 - Question

What kind of stresses does the welded joint undergo?

a) Torsional shear stress
b) Direct shear stress
c) Direct and torsional shear stress
d) None of the listed

Explanation: After shifting force to CG, we have a force and a moment about CG.

10 - Question

While considering moment of inertia for calculating torsional shear stress, J=I(xx) + I(yy), which of the following can be neglected in context with the following figure?

a) I(xx)
b) I(yy)
c) Both I(xx) and I(yy)
d) None of the listed

Explanation: I(xx) is negligible as compared to I(yy) as I(xx)=ltᵌ/12 and t is very less as compared to l so I(xx) is neglected in comparison to I(yy).

11 - Question

Calculate the direct shear stress in the welds by ignoring torsional shear stress if P=8kN and thickness of weld is 5mm.

a) None of the listed
b) 12.33N/mm
c) 13.33N/mm
d) 14.33N/mm

Explanation: Direct Shear=P/2xtx60.

12 - Question

Determine the torsional shear stress in the welds if P=8kN and thickness of the welds is assumed t.

a) None of the listed
b) 456.34/t
c) 543.13/t
d) 589.31/t

Explanation: M=8000×150,r(farthest point)=√25²+25²,J=2x[tlᵌ/12 + Ar₁²] ; τ=Mr/J.

13 - Question

Find the thickness of the weld if P=8kN and permissible shear stress in the welds is 100N/mm²

a) 4mm
b) 5mm
c) 6mm
d) 7mm