Workshop Technology
A three high rolling mill consists of three rolls placed one above the other. Which of the following statement is correct?

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

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Workshop Technology
In a hot chamber die casting machine

Ferrous alloys with low melting temperature are casted
Nonferrous alloys with low melting temperature are casted
Ferrous alloys with high melting temperature are casted
Nonferrous alloys with high melting temperature are casted

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Workshop Technology
In permanent mould casting method

Molten metal is poured and allowed to solidify while the mould is revolving
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 forced into mould under high pressure

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Workshop Technology
A jolt machine is used to

Produce uniform sand hardness throughout the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform packing of sand in the mould

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