Technician A states that when measuring the drum diameter, the measurement should be taken at the deepest groove or worn part of the drum. Technician B states that if it is over the size limit, the drum must be replaced. Who is correct?

Analyze the factors that influence the choice between the following pairs of processes to make the products indicated: i) sand casting versus die casting of an electric-motor housing ii) thread rolling versus machining of a bolt for high-strength application. (co3/c5)