Workshop Technology
Thermit, used in Thermit welding, is a mixture of

Charcoal and aluminium
Iron oxide and aluminium
Charcoal, iron oxide and aluminium
Charcoal and iron oxide

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Workshop Technology
Lancing is the operation of

Removal of metal to the desired shape from the edge of a plate
Bending a sheet of metal along a curved axis
Cutting a sheet of metal through part of its length and then bending the cut portion
Cutting a sheet of metal in a straight line along the length

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

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