Workshop Technology
Tandem drawing of wires and tubes is necessary because

It is not possible to reduce at one stage
Surface finish improves after every drawing stage
Annealing is needed between stages
Accuracy in dimensions is not possible otherwise

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

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