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 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
Any one of the above

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Workshop Technology
Riddle is used for

Reinforcement of sand in the top part of moulding box
Moistening the sand around the edge before removing pattern
Smoothing and cleaning out depressions in the mould
Cleaning the moulding sand

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Workshop Technology
Piercing is an operation of cutting

A number of holes evenly spaced in a regular pattern on a sheet of metal
A cylindrical hole in a sheet of metal by the punch and the die
A hole (other than cylindrical) in a sheet of metal by the punch and the die
A flat sheet to the desired shape

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