Test 27 - Welded Joints

Question 1 ప్రశ్న 1

Which statement correctly describes the current Indian-code context for welded structural-steel connections?

A IS 800:2007 contains structural weld design provisions and requires welds and welding to conform to IS 816 and IS 9595, as appropriate B IS 456 is the principal code for structural-steel weld design C Weld design is excluded from IS 800:2007 D Only the older Working Stress provisions may be used for welded steel connections

Question 2 ప్రశ్న 2

Which set consists entirely of weld types recognized in IS 800:2007?

A Fillet, butt, slot, plug and compound welds B Lap, bearing, friction and riveted welds C Black, turned and fitted welds D Shop bolts, field bolts and plug rivets

Question 3 ప్రశ్న 3

For an ordinary fillet weld, what dimension is taken as the weld size under IS 800:2007?

A The effective throat thickness B The minimum weld leg size C The weld length divided by two D The thickness of the thicker plate

Question 4 ప్రశ్న 4

A normal 8 mm fillet weld joins two surfaces at 90 degrees. Using the IS 800 value K = 0.70, what effective throat thickness is used for stress calculations?

A 4.0 mm B 5.6 mm C 8.0 mm D 11.4 mm

Question 5 ప్రశ్న 5

A fillet weld of size 8 mm joins fusion faces at an angle of 110 degrees. If IS 800 Table 22 gives K = 0.55 for the applicable angle range, what effective throat thickness should be used?

A 4.0 mm B 4.4 mm C 5.2 mm D 5.6 mm

Question 6 ప్రశ్న 6

Two steel parts are to be connected by a single-run fillet weld, and the thicker part is 18 mm thick. What minimum weld size is specified by IS 800:2007 Table 21 in the absence of preheating considerations requiring otherwise?

A 3 mm B 4 mm C 5 mm D 6 mm

Question 7 ప్రశ్న 7

A fillet weld is applied along the square edge of a 10 mm thick plate. According to the usual IS 800 detailing recommendation, what weld size should generally not be exceeded if the plate edge is to project beyond the weld?

A 6.0 mm B 7.0 mm C 8.5 mm D 10.0 mm

Question 8 ప్రశ్న 8

A continuous 6 mm fillet weld has an actual overall length of 162 mm. Using the usual IS 800 detailing relation that the actual weld length is the effective length plus twice the weld size, what effective length corresponds to this weld?

A 144 mm B 150 mm C 156 mm D 162 mm

Question 9 ప్రశ్న 9

Under IS 800:2007 Clause 10.5.4.1, a normal continuous fillet weld has size 6 mm. What is the minimum actual weld length under the provision that the actual length shall not be less than four times the weld size?

A 12 mm B 18 mm C 24 mm D 40 mm

Question 10 ప్రశ్న 10

A 6 mm fillet weld terminates at the corner of a connected part. Where an end return is practicable, what minimum return length does IS 800 recommend?

A 6 mm B 9 mm C 12 mm D 24 mm

Question 11 ప్రశ్న 11

Two plates form a welded lap joint, and the thinner plate is 12 mm thick. What minimum lap length is required by the IS 800 rule of four times the thinner-part thickness or 40 mm, whichever is greater?

A 40 mm B 48 mm C 60 mm D 80 mm

Question 12 ప్రశ్న 12

For a shop fillet weld, the smaller ultimate tensile strength of the weld metal and parent metal is 410 MPa. Using gamma_mw = 1.25, what design weld strength fwd = fu/(sqrt(3) gamma_mw) is obtained?

A 157.8 MPa B 189.4 MPa C 236.7 MPa D 328.0 MPa

Question 13 ప్రశ్న 13

For the same fu = 410 MPa weld made at site during erection, use gamma_mw = 1.50. What design weld strength is obtained?

A 136.7 MPa B 157.8 MPa C 189.4 MPa D 236.7 MPa

Question 14 ప్రశ్న 14

A shop-welded connection has two parallel 6 mm fillet welds, each with effective length 150 mm. Take K = 0.70 and fwd = 189.37 MPa. What total design strength of the two welds is obtained for direct shear?

A 119.3 kN B 159.1 kN C 238.6 kN D 318.2 kN

Question 15 ప్రశ్న 15

A factored axial force of 200 kN is to be transferred by two identical parallel 6 mm shop fillet welds. Take K = 0.70 and fwd = 189.37 MPa. What minimum effective length is required for each weld, ignoring long-joint reduction?

A 63 mm B 100 mm C 126 mm D 252 mm

Question 16 ప్రశ్న 16

Two plates of thickness 16 mm and 12 mm are connected by a complete-penetration butt weld. What effective throat thickness is used according to IS 800:2007?

A 6 mm B 12 mm C 14 mm D 16 mm

Question 17 ప్రశ్న 17

How is a complete-penetration butt weld treated for design strength under IS 800:2007?

A It is always assigned half the strength of the parent metal B It is treated as parent metal with thickness equal to the effective throat, and stresses are limited by the corresponding parent-metal design provisions C It is designed using the bolt-bearing equation D It can resist only shear and never direct tension

Question 18 ప్రశ్న 18

For an intermittent 6 mm fillet weld, what minimum effective length must each weld segment have under IS 800:2007?

A 24 mm B 30 mm C 36 mm D 40 mm

Question 19 ప్రశ్న 19

Intermittent fillet welds connect 10 mm thick plates. What is the maximum permitted clear spacing between effective weld lengths for a tension joint, based on the IS 800 limit of 16 times the thinner-part thickness or 200 mm, whichever is less?

A 100 mm B 120 mm C 160 mm D 200 mm

Question 20 ప్రశ్న 20

For the same 10 mm thick plates, what maximum clear spacing applies to intermittent fillet welds in a compression joint when the IS 800 limit is 12 times thickness or 200 mm, whichever is less?

A 100 mm B 120 mm C 160 mm D 200 mm

Question 21 ప్రశ్న 21

A side weld transferring shear has an effective throat thickness of 4.2 mm. At what joint length does the IS 800 long-joint threshold of 150 times the throat thickness occur?

A 420 mm B 525 mm C 630 mm D 840 mm

Question 22 ప్రశ్న 22

A fillet weld is subjected simultaneously to a normal stress fa = 150 MPa and shear stress q = 50 MPa. Using the IS 800 expression fe = sqrt(fa^2 + 3q^2), what equivalent stress is obtained?

A 158.1 MPa B 166.7 MPa C 173.2 MPa D 200.0 MPa

Question 23 ప్రశ్న 23

For an in-plane eccentrically loaded weld group, which statement best describes the usual elastic weld-group analysis?

A Only the direct force is considered and eccentricity is ignored B The direct load is distributed over the total effective weld length and the eccentric moment produces a secondary shear whose magnitude varies with distance from the weld-group centroid C Only the weld nearest the load carries force D The torsional component is uniform and independent of distance from the group centroid

Question 24 ప్రశ్న 24

A weld group consists of two vertical weld lines, each 100 mm long, located at x = ±50 mm from the group centroid and extending from y = -50 mm to y = +50 mm. A downward load of 100 kN acts 100 mm to the right of the centroid. Using qd = P/Ltotal and qm = Mr/J, with J = 666666.7 mm^3 for the weld-line group, what is the maximum resultant weld force per unit length at a corner?

A 0.583 kN/mm B 0.795 kN/mm C 1.061 kN/mm D 1.458 kN/mm

Question 25 ప్రశ్న 25

For the eccentric weld group in the previous question, suppose each weld is a 6 mm shop fillet weld with K = 0.70 and fwd = 189.37 MPa. The design resistance per unit effective weld length is t_t fwd. Which conclusion is correct when the maximum demand is 1.458 kN/mm?

A The weld is adequate because its resistance is approximately 1.59 kN/mm B The weld is adequate because its resistance is approximately 1.06 kN/mm C The weld is inadequate because its resistance is only approximately 0.795 kN/mm D The weld is exactly adequate because demand and resistance are equal

Question 26 ప్రశ్న 26

Which statement most accurately compares welded connections with conventional riveted or bearing-type bolted connections?

A Welded connections generally avoid fastener holes and can provide continuous force transfer, but weld quality, residual stresses, distortion, fatigue behaviour and fabrication control still require careful consideration B Welding removes the need to check the connected parent metal C A welded connection can never experience fatigue cracking D Welding always produces a weaker connection than riveting irrespective of geometry and workmanship

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