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In control systems, list examples of transducers, actuators, and sensors, and describe their functions and advantages.
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QUESTION 4
4.1 A transducer is an electrical device that converts one type of energy to another.
List THREE examples of input transducers.
- Thermistor
- Light Dependent Resistor (LDR)
- Pressure sensor
4.2 List FOUR advantages of electrical transducers.
- They offer high accuracy and precision.
- They have a fast response time.
- They allow for remote operation and monitoring.
- They are compatible with electronic control systems and data processing.
4.3 List THREE types of actuators.
- Hydraulic actuators
- Pneumatic actuators
- Electric actuators
4.4 Define the term sensor as used in control systems.
A sensor is a device that detects and measures a physical quantity (like temperature, pressure, or light) and converts it into an electrical signal that can be read and processed by a control system.
4.5 List THREE types of hydraulic valves that are classified according to their function.
- Directional control valves
- Pressure control valves
- Flow control valves
4.6 Name FIVE input devices that can be connected to a programmable logic controller.
- Push buttons
- Limit switches
- Proximity sensors
- Photoelectric sensors
- Temperature sensors
4.7 Name TWO requirements of an emergency-stop button.
- It must be easily accessible and clearly visible.
- It must have a latching mechanism to remain in the "stop" position once activated.
4.8 State THREE purposes of a manufacturer's manual.
- To provide operating instructions for safe and correct use of the equipment.
- To detail maintenance procedures and schedules to ensure longevity and performance.
- To offer troubleshooting guides for common problems and their solutions.
QUESTION 5
5.1 Complete the table by filling in the CORRECTIVE ACTION.
| PROBLEM | POSSIBLE CAUSE | CORRECTIVE ACTION |
|---|---|---|
| Bearing heats up and seizes up | Rollers damaged | 5.1.1 Replace the damaged bearing |
| Cracks or notches appear on bearing | Excessive shock loads | 5.1.2 Reduce shock loads on the bearing |
| Bearing surface partially or fully rusted | Penetration by water | 5.1.3 Improve sealing to prevent water ingress |
| Heavy wear | Foreign particles in the lubricant | 5.1.4 Filter or replace contaminated lubricant |
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