Workshop Technology
The purpose of a riser is to

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

ANSWER DOWNLOAD EXAMIANS APP

Workshop Technology
In permanent mould casting method

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

ANSWER DOWNLOAD EXAMIANS APP