Workshop Technology
In a four high rolling mill, there are four rolls out of which

Two are working rolls and two are backing up rolls
All of the four are working rolls
Three are working rolls and one is backing up roll
One is working roll and three are backing up rolls

ANSWER DOWNLOAD EXAMIANS APP

Workshop Technology
The purpose of a riser is to

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

ANSWER DOWNLOAD EXAMIANS APP