This set of Design of Steel Structures Multiple Choice Questions & Answers (MCQs) focuses on “Design Specifications”.

1. Which of the following are not the assumptions made in the analysis of welded joints?

a) welds connecting various joints are homogenous, isotropic

b) parts connected by weld are rigid

c) only stresses due to internal forces are considered

d) effects of residual stresses are neglected

View Answer

Explanation: The following are the assumptions made in analysis of welded joints: (i) welds connecting various joints are homogenous, isotropic and elastic elements, (ii) parts connected by weld are rigid and their deformations are neglected, (iii) only stresses due to external forces are considered. Effects of residual stresses, stress concentration and shape of welds are neglected.

2. The minimum size of fillet weld should _______

a) not be less than 3mm

b) be less than 3mm

c) be less than 2mm

d) greater than thickness of thinner part joined

View Answer

Explanation: The minimum size of fillet weld should not be less than 3mm and not more than thickness of thinner part joined.

3. The maximum size of fillet weld is obtained by _______

a) adding 1.5mm to thickness of thinner member to be jointed

b) adding 3mm to thickness of thinner member to be jointed

c) subtracting 3mm from thickness of thinner member to be jointed

d) subtracting 1.5mm from thickness of thinner member to be jointed

View Answer

Explanation: The maximum size of fillet weld is obtained by subtracting 1.5mm from thickness of thinner member to be jointed. The maximum size of weld should not be more than 3/4 of the thickness of section at toe when welds are applied to round toe of steel sections.

4. What is the minimum specified length of fillet weld?

a) two times the size of weld

b) four times the size of weld

c) six times the size of weld

d) half the size of weld

View Answer

Explanation: As per IS code, the actual length of fillet weld should not be less than four times the size of weld. If this requirement is not met, the size of weld should be one fourth of the effective length.

5. Effective length of fillet weld is _______

a) equal to overall length plus twice the weld size

b) twice the overall length plus twice the weld size

c) equal to overall length minus twice the weld size

d) twice the overall length minus twice the weld size

View Answer

Explanation: Effective length of fillet weld is taken equal to overall length minus twice the weld size. The deduction is made to allow for craters to be formed at the ends of welded length.

6. End returns are made ________

a) equal to twice the size of weld

b) equal to half the size of weld

c) equal to the size of weld

d) equal to thrice the size of weld

View Answer

Explanation: End returns are made equal to twice the size of weld to relieve the weld lengths from high stress concentrations at the ends.

7. Which of the following is not true regarding effective throat thickness of weld?

a) Effective throat thickness should not be less than 3mm

b) It should not exceed 0.7t or 1t, where t is thickness of thinner plate of elements being welded

c) Effective throat thickness = K x size of weld, where K is a constant

d) Effective throat thickness = K x (size of weld)^{2} , where K is a constant

View Answer

Explanation: Effective throat thickness is the shortest distance from the root of fillet weld to face of diagrammatic weld(line joining the toes). The effective throat thickness should not be less than 3mm and it should not exceed 0.7t or 1t, where t is thickness of thinner plate of elements being welded. Effective throat thickness = K x size of weld, where K is a constant which depends on angle between fusion faces.

8. The effective throat thickness is K times the size of weld. What is the value of K when angle between fusion faces is 80˚?

a) 0.5

b) 0.65

c) 0.7

d) 1

View Answer

Explanation: The value of K varies with angle between fusion faces. Values of K for different angles between fusion faces are :

Angle between fusion faces | 60˚-90˚ | 91˚-100˚ | 101˚-106˚ | 107˚-113˚ | 114˚-120˚ |

K | 0.7 | 0.65 | 0.6 | 0.55 | 0.5 |

9. The length of overlap of plates to be fillet welded in lap joint ____

a) should not be less than 4 times the thickness of thinner part

b) should be less than 4 times the thickness of thinner part

c) should be less than 2 times the thickness of thinner part

d) should not be less than 2 times the thickness of thinner part

View Answer

Explanation: The length of overlap of plates to be fillet welded in lap joint should not be less than 4 times the thickness of thinner part.

10. Which of the following option is incorrect?

a) Effective length of groove weld should not be less than 4 times the weld size

b) Effective length of groove weld should be less than 4 times the weld size

c) Effective length of intermittent weld should not be less than 4 times the weld size

d) Effective length of intermittent weld should have a minimum length 80mm

View Answer

Explanation: Effective length of groove weld should not be less than 4 times the weld size. Effective length of intermittent weld should not be less than 4 times the weld size, with a minimum of 40mm.

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