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

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Workshop Technology
The purpose of a riser is to

Feed the molten metal to the casting in order to compensate for the shrinkage
Deliver the molten metal from pouring basin to gate
Deliver molten metal into the mould cavity
Act as a reservoir for the molten metal

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Workshop Technology
In permanent mould casting method

Molten metal is forced into mould under high pressure
None of these
Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
Molten metal is poured and allowed to solidify while the mould is revolving

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