Two pipes of inner diameter 100 mm and outer diameter 110 mm each join – McqOptions

MCQOPTIONS

1.	Two pipes of inner diameter 100 mm and outer diameter 110 mm each joined by flash butt welding using 30 V power supply. At the interface, 1 mm of the material melts from each pipe which has a resistance of 42.4 Ω. If the unit melt energy is 64.4 MJm-3, then the time required for welding in seconds is
A.	1
B.	5
C.	10
D.	20
Answer» D. 20

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