BSIE Manufacturing Process Automation 3 — Questions and Answers
Question 1: In a PID controller, what effect does increasing the integral gain (Ki) have on system response?
- Reduces steady-state error but may cause overshoot and instability (Correct answer)
- Increases rise time and reduces overshoot
- Has no effect on steady-state error
- Only affects the derivative response
Correct answer: Reduces steady-state error but may cause overshoot and instability
Increasing integral gain eliminates steady-state error by accumulating past errors, but too much can cause oscillation and instability due to integral windup.
Question 2: What is the function of a resolver in a CNC machine tool?
- Cooling the spindle motor
- Measuring angular position of a rotating shaft (Correct answer)
- Converting G-code to machine commands
- Detecting tool breakage
Correct answer: Measuring angular position of a rotating shaft
A resolver is a rotary sensor that measures the angular position and velocity of a shaft, providing feedback for closed-loop servo control in CNC machines.
Question 3: Which manufacturing automation level in the ISA-95 hierarchy model is concerned with production scheduling and resource management?
- Level 0 — Field/Process
- Level 1 — Basic Control
- Level 3 — Manufacturing Operations Management (MES) (Correct answer)
- Level 4 — Business Planning (ERP)
Correct answer: Level 3 — Manufacturing Operations Management (MES)
Level 3 (MES) handles production scheduling, resource management, quality management, and performance analysis on the shop floor.
Question 4: In automated assembly, what is the purpose of a vibratory bowl feeder?
- Welding small components together
- Orienting and feeding small parts in a consistent attitude to assembly stations (Correct answer)
- Applying adhesive to components
- Testing electrical continuity of assembled parts
Correct answer: Orienting and feeding small parts in a consistent attitude to assembly stations
A vibratory bowl feeder uses vibration and specially designed tracks to sort, orient, and deliver small parts in a uniform position and direction to automated assembly equipment.
Question 5: What does OEE (Overall Equipment Effectiveness) measure in a manufacturing plant?
- Total energy consumption of equipment
- The product of availability, performance, and quality rates (Correct answer)
- Ratio of planned to actual maintenance costs
- Number of defects per million opportunities
Correct answer: The product of availability, performance, and quality rates
OEE = Availability × Performance × Quality, providing a composite measure of how effectively manufacturing equipment is utilized.
Question 6: Which sensor technology is best suited for detecting metallic objects regardless of color or surface finish in an automated conveyor system?
- Photoelectric through-beam sensor
- Inductive proximity sensor (Correct answer)
- Capacitive proximity sensor
- Ultrasonic sensor
Correct answer: Inductive proximity sensor
Inductive proximity sensors generate an electromagnetic field that detects metallic objects based on eddy current losses, making them insensitive to color, surface finish, or contamination.
Question 7: In computer-integrated manufacturing (CIM), what is the role of CAM (Computer-Aided Manufacturing)?
- Designing product geometry and engineering drawings
- Generating machine tool paths and NC programs from CAD models (Correct answer)
- Managing bills of materials in ERP systems
- Scheduling preventive maintenance tasks
Correct answer: Generating machine tool paths and NC programs from CAD models
CAM software translates CAD geometry into specific machine tool paths, feeds, speeds, and NC code to drive CNC machines and other automated manufacturing equipment.
BSIE Manufacturing Process Automation 3
In a PID controller, what effect does increasing the integral gain (Ki) have on system response?