1
GATE PI 2003
MCQ (Single Correct Answer)
+2
-0.6
Match List - I (welding defects) with List - II (causes) and select the correct answer using the codes given below the lists GATE PI 2003 Joining of Materials - Welding Question 30 English
A
$$A - 4,\,\,B - 2,\,\,C - 3,\,\,D - 1$$
B
$$A - 4,\,\,B - 2,\,\,C - 1,\,\,D - 3$$
C
$$A - 2,\,\,B - 4,\,\,C - 1,\,\,D - 3$$
D
$$A - 2,\,\,B - 4,\,\,C - 3,\,\,D - 1$$
2
GATE PI 2002
MCQ (Single Correct Answer)
+2
-0.6
In spot pulsed laser welding of aluminium plates (density $$ = 2700kg/{m^3},$$ specific heat $$=896J/kg,$$ melting temp $$=933K,$$ latent heat of melting $$ = 398\,\,kJ/kg)$$ at a temp of $${30^ \circ }C,$$ pulse with energy of $$0.5J$$ is focused onto an area of $$0.05m{m^2}.$$ If the entire energy is coupled into the material, what will be the depth of weld assuming the $$CS$$ area of the weld is circular and is uniform throughout its depth and only heat conduction in the direction of penetration
A
$$5.34mm$$
B
$$2.15mm$$
C
$$4.23mm$$
D
$$3.85mm$$
3
GATE PI 1993
MCQ (Single Correct Answer)
+2
-0.6
During gas welding of copper sheets a neutral flame was used consuming $$8$$ liters of acetylene. But the weld was found to be defective. So it was re-welded using an oxidizing flame. The likely consumption of oxygen in liters will be
A
$$6$$
B
$$8$$
C
$$10$$
D
$$16$$
4
GATE PI 1992
Subjective
+2
-0
GATE PI 1992 Joining of Materials - Welding Question 37 English
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