ME or MEng Master of Engineering Master of Engineering Computer-Aided Manufacturing 2 — Questions and Answers
Question 1: In CNC machining, what does the G41 command specify?
- Tool length compensation
- Cutter radius compensation left (Correct answer)
- Cutter radius compensation right
- Fixture offset activation
Correct answer: Cutter radius compensation left
G41 activates cutter radius compensation to the left of the programmed tool path.
Question 2: Which manufacturing process uses a focused beam of electrons to melt and fuse metal powder layer by layer?
- Selective Laser Sintering (SLS)
- Fused Deposition Modeling (FDM)
- Electron Beam Melting (EBM) (Correct answer)
- Binder Jetting
Correct answer: Electron Beam Melting (EBM)
Electron Beam Melting (EBM) uses a high-energy electron beam in a vacuum to fully melt metal powder.
Question 3: What is the primary purpose of a Digital Twin in Computer-Aided Manufacturing?
- To replace physical prototypes entirely
- To create a virtual replica for simulation and monitoring of physical assets (Correct answer)
- To store CAD files in the cloud
- To automate quality inspection reports
Correct answer: To create a virtual replica for simulation and monitoring of physical assets
A Digital Twin mirrors a physical asset in real time, enabling simulation, predictive maintenance, and process optimization.
Question 4: In sheet metal forming simulation, which criterion is most commonly used to predict fracture during deep drawing?
- Von Mises yield criterion
- Forming Limit Diagram (FLD) (Correct answer)
- Taylor factor
- Bauschinger effect index
Correct answer: Forming Limit Diagram (FLD)
The Forming Limit Diagram (FLD) maps strain states where sheet metal fractures or wrinkles during forming.
Question 5: Which communication protocol is most commonly used for real-time data exchange in industrial IoT (IIoT) manufacturing environments?
- FTP
- OPC-UA (Correct answer)
- HTTP/1.1
- SMTP
Correct answer: OPC-UA
OPC-UA (Open Platform Communications Unified Architecture) is the standard for secure, platform-independent industrial data exchange.
Question 6: When performing tolerance stack-up analysis, the Root Sum Square (RSS) method assumes that:
- All tolerances are at their worst-case limits simultaneously
- Individual tolerances are statistically independent and normally distributed (Correct answer)
- Manufacturing processes have zero mean shift
- Only bilateral tolerances are valid
Correct answer: Individual tolerances are statistically independent and normally distributed
RSS analysis assumes tolerances are statistically independent and follow normal distributions, yielding a less conservative result than worst-case analysis.
Question 7: In CAM software, what is the function of a 'rest machining' toolpath strategy?
- Machining only the flat surfaces of a part
- Removing material left behind by a larger tool using a smaller tool (Correct answer)
- Restarting an interrupted machining operation
- Generating finishing passes after heat treatment
Correct answer: Removing material left behind by a larger tool using a smaller tool
Rest machining identifies and removes residual material left in corners or recesses by a previous, larger cutting tool.
ME or MEng Master of Engineering Master of Engineering Computer-Aided Manufacturing 2
In CNC machining, what does the G41 command specify?