Workshop Technology
Which of the following welding method uses a pool of molten metal?

MIG arc welding
Submerged arc welding
TIG arc welding
Carbon arc welding

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Workshop Technology
A three high rolling mill consists of three rolls placed one above the other. Which of the following statement is correct?

Any one of the above
The bottom and middle roll rotate in the same direction
The upper and middle rolls rotate in the same direction whereas the bottom roll rotates in opposite direction
The upper and bottom rolls rotate in the same direction whereas the middle roll rotates in opposite direction

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