BSIE Manufacturing Process Automation 2 — Questions and Answers
Question 1: Which communication protocol is most commonly used for real-time data exchange between PLCs and SCADA systems in industrial environments?
- HTTP/REST
- Modbus TCP (Correct answer)
- Bluetooth LE
- SMTP
Correct answer: Modbus TCP
Modbus TCP is a widely adopted industrial protocol for real-time communication between PLCs and SCADA systems due to its simplicity and reliability.
Question 2: In a flexible manufacturing system (FMS), what is the primary role of the material handling system?
- Programming CNC machines
- Transporting workpieces between workstations (Correct answer)
- Monitoring tool wear
- Generating production reports
Correct answer: Transporting workpieces between workstations
The material handling system in an FMS moves workpieces between workstations automatically, enabling continuous and flexible production flow.
Question 3: What does the term 'dead band' refer to in process control systems?
- The maximum allowable set point deviation
- A range of input values that produce no change in controller output (Correct answer)
- The time delay between sensor reading and actuator response
- The frequency band filtered out by signal conditioning
Correct answer: A range of input values that produce no change in controller output
Dead band is the range of error values within which the controller takes no corrective action, preventing unnecessary actuator cycling.
Question 4: Which type of robot configuration offers the largest and most irregular work envelope?
- Cartesian (gantry) robot
- SCARA robot
- Articulated (revolute) robot (Correct answer)
- Cylindrical robot
Correct answer: Articulated (revolute) robot
Articulated robots with multiple rotary joints can reach around obstacles and access complex spatial positions, giving them the largest and most irregular work envelopes.
Question 5: In automated optical inspection (AOI), which imaging technique is commonly used to detect surface defects on printed circuit boards?
- X-ray tomography
- Structured light scanning
- Infrared thermography
- 2D grayscale or color vision with pattern matching (Correct answer)
Correct answer: 2D grayscale or color vision with pattern matching
AOI systems typically use 2D camera-based vision with grayscale or color imaging and pattern matching algorithms to detect solder defects, missing components, and misalignments on PCBs.
Question 6: What is the primary advantage of using servo motors over stepper motors in precision motion control applications?
- Lower cost per unit
- Closed-loop feedback enabling higher accuracy at high speeds (Correct answer)
- Simpler wiring and control electronics
- No need for a controller
Correct answer: Closed-loop feedback enabling higher accuracy at high speeds
Servo motors use closed-loop feedback (encoders) to continuously correct position, maintaining accuracy even under varying loads and high speeds.
Question 7: Which lean automation concept focuses on stopping a production line automatically when a defect is detected?
- Kanban
- Jidoka (autonomation) (Correct answer)
- Heijunka
- Poka-yoke
Correct answer: Jidoka (autonomation)
Jidoka, or autonomation, is the Toyota principle of building in intelligence to detect abnormalities and stop the line automatically to prevent defect propagation.
BSIE Manufacturing Process Automation 2
Which communication protocol is most commonly used for real-time data exchange between PLCs and SCADA systems in industrial environments?