BME Advanced Manufacturing 5

Question 1

In computer-aided process planning (CAPP), the variant approach works by:

Accepted Answer

Retrieving and modifying an existing plan for a similar part using group technology

Answer

The variant CAPP approach classifies the new part into a family, retrieves the standard plan for that family, then modifies it to suit the specific part's requirements.

Question 2

During deep drawing of sheet metal, wrinkling of the flange is typically prevented by:

Accepted Answer

Applying a blank holder force to keep the flange flat

Answer

A blank holder applies a controlled force to the sheet flange, suppressing compressive instability that would otherwise cause wrinkling as the material flows inward.

Question 3

Which machining process is best suited for producing highly accurate flat reference surfaces on cast iron machine tool bases?

Accepted Answer

Surface grinding

Answer

Surface grinding uses a rotating abrasive wheel traversing the workpiece, achieving flatness tolerances and surface finishes unattainable by milling on hardened machine tool components.

Question 4

What does a high process capability index (Cpk > 1.67) indicate about a manufacturing process?

Accepted Answer

The process mean is well-centered and variation is well within specification limits

Answer

A Cpk above 1.67 means the process distribution fits comfortably within specification limits with ample margin, corresponding to fewer than 0.6 defects per million opportunities.

Question 5

In laser beam machining (LBM), the parameter most directly controlling the depth of material removed per pulse is:

Accepted Answer

Peak power density (irradiance) at the workpiece surface

Answer

Peak power density (W/cm²) determines whether the threshold for ablation, melting, or vaporization is exceeded and how deeply each pulse penetrates the material.

BME - Bachelor of Mechanical Engineering Practice Test

BME - Bachelor of Mechanical Engineering Practice Test

BME Advanced Manufacturing 5