Lawn Mower Mechanics: Functions, Design, and Maintenance
Grass Cutting Mechanism
How is the grass cut?
The grass is cut by the blades.
How is the height of the cut adjusted?
The cut is adjusted by spacers (to adjust blade height).
What is the purpose of the fan?
The purpose of the fan is to suck in air.
How do the cuttings enter the grass box?
The cuttings enter the grass box via the impeller fan.
How is power provided?
Power is provided by a power lead.
How is the motor protected from grass intake?
The motor is protected from grass intake by a grass filter.
What
Read MoreEngine Performance: Theoretical vs. Practical Diagrams & Timing
Engine Performance: Theoretical vs. Practical Diagrams
Key Losses in Actual Motor Operation:
- Cargo pumping and drainage loss
- Gas cylinder pumping work
Theoretical vs. Practical Diagram Differences
In a practical diagram, the admission pressure remains below atmospheric pressure, and the pump exhaust exceeds the theoretical. Negative work load occurs in the cylinder.
Losses in the Cylinder
- Incomplete cylinder filling results in compression pressure lower than theoretical.
- Heat loss to the cooling circuit.
Understanding Architectural Documents and Home Systems
Architectural Documents and Building Permits
Different Architectural Documents
Building License: Ensures compliance with safety and comfort regulations. This license allows contractors and installers to begin work.
First Occupation License: Local authorities inspect the property to verify that the construction aligns with the approved project and adheres to all regulations. If compliant, the license is granted to the developer.
Habitability Certificate: This document, along with the first occupation
Read MoreRemovable Orthodontic Appliances: Hawley Plate and Functional Devices
Hawley Plate: Removable Appliance and Passive Function
The Hawley plate is a removable appliance with a passive function. Its key components include:
Parts and Retainers
Retainers: These are wire elements that hold the plate in the mouth. A 0.9 mm vestibular arch wire is placed in the anterior region, contacting the most prominent part of the vestibule. The wire ends are shaped into omega loops near the canines.
Resin: The resin occupies the palatal vault, providing stability to the appliance.
Expansion
Read MoreAntenna Technology and Signal Transmission Explained
Understanding Antenna Technology and Signal Transmission
Full-Duplex Transmission on DSL
Full-duplex transmission on DSL operates in two modes, utilizing frequency division range (BW) for echo cancellation.
DMT Modulation
DMT (Discrete Multitone) modulation involves using discrete multitones.
TRC (Television Receiver Circuit) Basics
A TRC works by passing an electron gun beam through an array of glass to a phosphor screen. This screen contains selected colors (red, blue, and green) that vary in intensity
Read MoreMaterial Properties: Mechanical, Physical, and More
Mechanical Properties
- Hardness: Resistance to being scratched or penetrated by another material.
- Toughness: Resistance to breakage when subjected to deformation.
- Ductility: Ability to be stretched into threads.
- Malleability: Ability to be spread into sheets.
- Fatigue: Deformation resulting from repeated loads.
- Brittleness: Increased strength and fragility as a result of cold deformation.
- Castability: Ability to fill a mold.
- Machinability: Ability to be cut by machine tools.
Physical Properties
- Density: Mass