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BARC & GATE Question series via Concepts Presented by Deep sangeet Maity

About ME Working as a Design engineer at "Cameron Manufacturing India Pvt Limited (A Schlumberger Company)". . Currently working as "GATE content editor and developer" at "Kreatryx" .Qualified GATE "3" times Qualified "Gate 2018 with 99.4 percentile 779(75.26 marks) gate score" in mechanical stream Qualified "Gate 2017 with 98.83 percentile 726(70 marks) gate score" in mechanical stream I also have an 3+ years of experience of teaching Engineering subjects like Engineering mechanies, Thermodynamies, SOM, HMIT Ex-CADD Engineer at "CADD CENTRE". Passed B.E. with honours with 76.71%. I am pursuing my MTech in Thermal I have an 2.5+ years of experience as a CADD Engineer. . Ialso have worked for "CAD ACADEMY" as a Design engineer for 1 year.

Question: In linear gas tungsten arc welding of two plates of the same material, the peak temperature T (in K) is given as T-14, where q is the heat input per unit length (in J m) of weld, is the thermal diffusivity (in m/s) of the plate materials and C1 is a constant independent of process parameters and material types. Two welding cases are given below. C1q Case 1: Case II: v-15 V, 1-200 A, -5 mm/s, k 150 W/mK, 3000 kg/m3, C 900 J/kg-K V= 15 V, 1-300 A, v = 10 mm/s, k = 50 W/mK, = 8000 kg/m", C = 450 J/kg-K where, Vis welding voltage, I is welding current, v is welding speed, and k, and C refer to the thermal conductivity, the density and the specific heat of the plate materials, respectively. Consider that electrical energy is completely converted to thermal energy. All other conditions remain same. The ratio of the peak temperature in Case I to that in Case II is 1 (C) 1 (D) 2 3 2

TCiwen) > J/m f Electmical ener

So s Therma en r1 giutn

Case- C. Case a

15 x 30 2 T.

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