BME Advanced Manufacturing 3

Question 1

In sheet metal forming, springback occurs because:

Accepted Answer

Elastic recovery causes the part to partially return toward its original shape after forming

Answer

After plastic deformation, the elastic component of strain recovers when the load is removed, causing the sheet to spring back toward its original geometry.

Question 2

Which surface finish process is most appropriate for achieving a mirror-like finish on hardened steel molds?

Accepted Answer

Superfinishing (honing with fine abrasive stones)

Answer

Superfinishing uses fine abrasive stones with oscillating motion to remove micron-level surface asperities, achieving Ra values below 0.05 µm on hardened steel.

Question 3

In a just-in-time (JIT) production system, the kanban card primarily serves as a:

Accepted Answer

Signal to authorize production or material replenishment

Answer

A kanban card is a visual signal that authorizes upstream production or delivery of exactly the quantity consumed, pulling material through the system.

Question 4

What is the key advantage of friction stir welding (FSW) over conventional fusion welding for aluminum alloys?

Accepted Answer

Solid-state process avoids melting defects like porosity and hot cracking

Answer

FSW operates below the melting point, using frictional heat and plastic deformation, eliminating solidification-related defects common in fusion welding of aluminum.

Question 5

In stereolithography (SLA) 3D printing, the photopolymer resin is cured by:

Accepted Answer

UV laser or projector selectively crosslinking the resin

Answer

SLA uses a UV light source to photopolymerize (crosslink) liquid resin layer by layer, building up the part from a vat of photosensitive material.

BME - Bachelor of Mechanical Engineering Practice Test

BME - Bachelor of Mechanical Engineering Practice Test

BME Advanced Manufacturing 3