JNTU
JNTU B.Tech III CAD AND CAM Previous Question Paper (August/September - 2021 - R18)
Answer any five questions. All questions carry equal marks.
Main
With the help of a neat sketch explain the flow of manufacturing information in the State-of-the-art CAD/CAM/CNC systems.
Answer
The flow of manufacturing information in a state-of-the-art CAD/CAM/CNC system follows an integrated digital thread starting from design conceptualization to physical production. The process begins with the CAD module, where a 3D geometric model is created. This model is exported via neutral formats (like IGES or STEP) or native interfaces to the CAM software.
In the CAM stage, the geometry is analyzed to define machining parameters, tool paths, and cutting sequences. The system then generates a Post-Processor file, which converts the generic cutter location (CL) data into a specific G-code program tailored to the target CNC machine's controller. Finally, this code is transferred to the CNC machine unit, which interprets the instructions to drive the machine axes and execute the physical manufacturing of the part.
Flow sequence: Design (CAD) → Toolpath Generation (CAM) → Post-Processing (G-code) → Machine Controller (CNC) → Physical Part.
Write briefly on the secondary storage devices used in CAD System along with their importance.
Answer
Secondary storage devices are essential in CAD systems for the non-volatile retention of large geometric models, assembly files, and simulation data. Unlike primary memory (RAM), these devices provide high-capacity, long-term storage necessary for complex engineering data.
Key secondary storage devices include:
- Solid State Drives (SSD): Currently the industry standard for CAD workstations due to high read/write speeds, which significantly reduce the time required to load large assemblies and perform rendering tasks.
- Hard Disk Drives (HDD): Used for mass storage of archival data, legacy projects, and extensive component libraries due to their lower cost per gigabyte compared to SSDs.
- Network Attached Storage (NAS) / Cloud Storage: Vital for collaborative design environments, allowing multiple engineers to access, version-control, and back up centralized CAD data securely.
The importance of these devices lies in their ability to maintain data integrity, support rapid retrieval of complex 3D models, and provide a reliable backup infrastructure to prevent the loss of critical intellectual property.
Why do you consider studying geometric modeling is important in relation to CAD in manufacturing industry? Explain with suitable case study.
Answer
Sign in to view the complete answer paper.
Define, describe and bring out the difference among explicit, implicit and non-parametric form of curves.
Answer
Sign in to view the complete answer paper.
Explain the parametric properties of Ruled surface and its Industrial Applications.
Answer
Sign in to view the complete answer paper.
Describe procedure to ensure convex hull property in Bezier surface.
Answer
Sign in to view the complete answer paper.
Discuss the common facilities available in a solid modeling package along with applications.
Answer
Sign in to view the complete answer paper.
What is boundary representation? What are the basic entities for B-rep? Validate the B-rep model using Euler’s law.
Answer
Sign in to view the complete answer paper.
With the aid of a neat diagram, explain the structure of a post processor in a NC System.
Answer
Sign in to view the complete answer paper.
Write down the syntax for defining a geometry in computer assisted part programming. Also name the four types of statements in a complete APT part program.
Answer
Sign in to view the complete answer paper.
"Use of canned cycles reduce the length of a manual part program" Justify this statement with suitable example.
Answer
Sign in to view the complete answer paper.
Describe the concept of DNC and what are the advantages of using DNC on the shop floor.
Answer
Sign in to view the complete answer paper.
What do you understand by machinability database system? Explain the different parameters required for machinability database system.
Answer
Sign in to view the complete answer paper.
Explain the various stages of Manufacturing Resource Planning (MRP-II) with suitable diagram. Also state the benefits of MRP-II.
Answer
Sign in to view the complete answer paper.
What are the various layout configurations of FMS? Explain with suitable applications.
Answer
Sign in to view the complete answer paper.
Explain how Machine Vision system is useful in industrial inspection.
Answer
Sign in to view the complete answer paper.