Workshop Technology
Shift is a casting defect which

Occurs as sand patches on the upper surface of a casting
Occurs near the ingates as rough lumps on the surface of a casting
Results in a mismatching of the top and bottom parts of a casting
Results in general enlargement of a casting

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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 upper and bottom rolls rotate in the same direction whereas the middle roll rotates in opposite direction
The bottom and middle roll rotate in the same direction

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Workshop Technology
In permanent mould casting method

Molten metal is forced into mould under high pressure
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
None of these
Molten metal is poured and allowed to solidify while the mould is revolving

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