REVISION Flashcards
what is predictive maintenance?
Predictive maintenance is a proactive maintenance strategy that uses real-time data and condition monitoring techniques to predict when equipment will fail, allowing maintenance to be performed only when necessary.
what is planned maintenance?
Planned maintenance is a proactive approach to maintaining electrical and mechanical systems by scheduling regular inspections, servicing, and repairs before a failure occurs.
what is reactive maintenance?
Reactive maintenance (also called breakdown maintenance) is a corrective approach where repairs are only carried out after a failure occurs.
what is routine maintenance?
Routine maintenance refers to regularly scheduled maintenance activities carried out to ensure equipment operates efficiently and safely. It typically includes basic inspections, cleaning, lubrication, and minor adjustments that help prevent breakdowns.
what does a circuit breaker protect from when tripping?
overload
short circuit
what is the half split fault finding technique?
The half-split method is a systematic fault-finding approach used in electrical and electronic circuits to quickly locate faults by dividing the circuit into halves and testing each section.
what is unit substitution in reference to fault finding?
Unit substitution is a fault-finding technique where a suspected faulty component or device is temporarily replaced with a known working unit to determine if the original unit is defective.
what is the 6 point technique in reference to fault finding?
1 . Collect Information – Gather details about the problem from operators, maintenance logs, or system indicators (e.g., error codes, alarms).
2 . Understand the Normal Operation – Know how the system should function under normal conditions to identify deviations.
- Identify Possible Causes – List potential causes based on symptoms (e.g., power failure, faulty components, loose connections).
4 .Test to Eliminate Causes – Perform systematic tests (voltage checks, continuity tests, visual inspection) to rule out incorrect assumptions.
- Confirm the Fault – Once a faulty component or issue is found, verify it by replicating the fault or swapping with a known working unit.
- Rectify & Test the System – Fix or replace the faulty component, restore power, and test to ensure the issue is resolved before returning the system to service.
what is the input output method in terms of fault finding?
The Input-Output (I/O) method is a structured troubleshooting technique used to diagnose faults in electrical and control systems by systematically checking the inputs and outputs of a system to identify where the failure occurs.
what is condition based maintenance?
Condition-Based Maintenance (CBM) is a maintenance strategy that involves monitoring the actual condition of equipment in real-time to determine when maintenance is needed. Rather than relying on a fixed schedule (like preventive maintenance), CBM only performs maintenance when specific indicators show signs of potential failure. (vibration monitoring for example)
What is BS7671:2018?
BS 7671:2018 is the British Standard for electrical wiring installations in the UK. It is also known as the IET Wiring Regulations (18th Edition) and sets out the rules for the design, installation, inspection, and testing of electrical systems to ensure safety.
What is the purpose of BS7671:2018?
🔹 Ensures electrical safety in homes, businesses, and industrial settings.
🔹 Provides guidance on wiring, earthing, and protective measures.
🔹 Helps prevent electric shocks, fires, and other electrical hazards.
🔹 Ensures compliance with UK legal and regulatory requirements.
What is BS7671 commonly known as?
IET wiring regulations
18th edition wiring regulations
what is the recommended safe lifting weight for manual handeling ?
25kg for men and 16kg for women.
what is a block diagram?
A block diagram is a simplified graphical representation of a system, process, or concept that uses blocks (rectangles or other shapes) to represent components or functions and arrows to show the flow of signals, power, or information between them.
what is a wiring diagram?
A wiring diagram is a detailed visual representation of an electrical circuit that shows the actual physical connections between components. It includes symbols for wires, electrical devices, and connections, helping electricians and engineers understand how a system is wired.
what is a schematic diagram?
A schematic diagram is a graphical representation of an electrical or electronic circuit that uses standardized symbols to illustrate components and their interconnections. Unlike a wiring diagram, which shows the physical arrangement of wires and components, a schematic diagram focuses on how the circuit functions logically.
what is a visual aid drawing?
A visual aid drawing is any graphical representation used to support communication, explanation, or instruction. It helps simplify complex ideas, making them easier to understand through images, diagrams, or illustrations.
what is the half split technique?
The half-split technique is a systematic troubleshooting method used to diagnose faults in electrical, electronic, or mechanical systems efficiently. It works by dividing a system into two halves and testing the midpoint to quickly determine which half contains the fault. This process is repeated until the exact faulty component or section is identified.
what is condition based maintenance?
proactive maintenance strategy where equipment is monitored in real-time, and maintenance is performed only when necessary based on the actual condition of the machine.
what is scheduled maintenance?
is a planned maintenance strategy where inspections, servicing, and repairs are performed at predetermined intervals, regardless of the equipment’s condition. It is done to prevent failures, ensure reliability, and extend the lifespan of machinery and systems.
what is pre planned maintenance?
Pre-Planned Maintenance (PPM) is a proactive maintenance strategy where all maintenance activities are scheduled in advance based on time, usage, or specific conditions. It ensures that equipment is regularly inspected, serviced, and repaired before potential failures occur.
what is preventative maintenance?
Preventive maintenance (PM) is a proactive approach to maintaining equipment by regularly servicing and inspecting it to prevent unexpected breakdowns and ensure smooth operation. It involves planned, scheduled tasks designed to reduce the likelihood of equipment failure and extend the lifespan of machinery, systems, and components.
what is an MCB?
circuit breaker
How does an MCB work?
An MCB (Miniature Circuit Breaker) works by detecting electrical faults (such as overloads or short circuits) and automatically disconnecting the affected circuit to prevent damage to the wiring and connected equipment
What does a MCB protect From?
overload
short circuit
how does an mcb protect from overload
The overload condition heats up a bimetallic strip inside the MCB. The bimetallic strip bends when it gets too hot (due to excess current), which then triggers the mechanism to disconnect the circuit.
how does an MCB protect from short circuits?
A magnetic coil inside the MCB detects the rapid surge in current. The coil produces a magnetic field that pulls on a lever, which trips the MCB to break the circuit immediately, preventing damage from the high current.
