Workshop Technology
The current in electric resistance welding can be regulated by

Any one of the listed here
Changing the secondary turns of the transformer
Changing the primary turns of the transformer
Varying the input supply

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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?

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

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