Notes, summaries, assignments, exams, and exercises for Technology for Vocational training

How does an LCD?
- Vertical filter film to polarize the incoming light.
- Glass substrate with electrodes of indium oxide ITO. The shapes of the electrodes determine the black shapes that appear when the screen turns on and off. The vertical edges of the surface is smooth.
- Liquid crystals "Twisted Nematic (TN).
- Glass Substrate common electrode film (ITO) with horizontal ridges to line up with the horizontal filter.
- Horizontal filter film to block / allow the passage of light.
- Reflecting surface to send light back to the viewer. A backlit LCD, this layer is replaced by a light source. Classification of screens depending on whether the light source emits it's own screen or reflected from an external source:
- Transmissive illumination:...

MIG and MAG Welding Systems

Depending on the system used, Gas Metal Arc Welding (GMAW) is categorized based on the shielding gas:

1. MIG (Metal Inert Gas): Uses inert gases like argon or helium. It is typically used to weld materials sensitive to oxidation, such as stainless steel, copper, aluminum, and sheet metal.
2. MAG (Metal Active Gas): Uses active gases, which include carbon dioxide, oxygen, or mixtures of argon and carbon dioxide. MAG is applied primarily to ordinary steel or low alloy steels.

GMAW Equipment Components

A complete GMAW setup consists of the following essential components:

1. Power Supply

   Provides the necessary electrical current for the arc.

2. Wire Feed Mechanism / Electrode

   This mechanism ensures the continuous feeding of the wire electrode.

Different Machines Divided

Simple Splitter Device

A simple splitter device utilizes a universal circular table attached to a division mechanism.

Division Procedures

Procedures include simple, compound, and differential methods.

Worm Gear Mechanism

The worm is a device that transmits motion between shafts that are at right angles.

Worm Gear Features

• Irreversible: Suitable for large reductions.
• High Cost.
• Motion passed at right angles.

Corona Gear

A corona gear is a gear in which teeth are inclined at an angle, similar to a propeller. There are two types: helical and jagged (herringbone).

Employment and Eccentric Cam

Cams are used when you need to transform circular motion. The eccentric cam types include:

• Rectilinear or oscillating flat plate.
• Drum type.
• Simple

Drum Brakes: Features

• Autoreinforcement of primary blocks.
• Decrease in operating force compared to disc brakes.
• Sensitivity to the coefficient of friction and temperature variations.
• Poor self-cleaning and little protection against dirt.

Drum Brake Types

• Brake duplex-simplex.
• Brake duo-servo.
• Brake duo-duplex.

Disc Brakes: Types

Disc Brake with Fixed Caliper

Features:

• A caliper is fixed on each side of the disc, using a high cylinder.
• Ideal for high-performance vehicles.

Brake Inline Frame (Floating Caliper)

Features:

• Uses a single pivot cylinder.
• Smaller radius, less liquid heating.

Disc Brake with Floating Caliper

Feature:

• Allows for a larger piston surface, exerting more force on the brake.
• Little danger of piston seizure.

Pneumatic Disc Brake with Floating Caliper

Features:

What is computer crime?

Any illegal or unauthorized behavior in connection with computers and computer networks.

What is malware?

Any malicious software, which includes any program or file that is harmful to a computer or its user.

What is computer abuse?

It is the use of a computer to do something improper or illegal, such as using a computer to expose an individual's personal information, changing the content of a website owned by someone else, or using one computer to gain unauthorized access to another.

What is computer fraud?

It is the act of using an electronic device to gain personal or sensitive information illegally for economic purposes.

What is computer sabotage?

It is the act of damaging the hardware or software of a computer.

It is a deliberate...

Pliars: The plier is a hand tool. It is my favorite tool. It is very useful for many kinds of different jobs; for example, it is useful for electricians. It is made of metal, plastic, steel, and other materials. It has a plastic handle, which is insulating. It is used for picking up objects and cutting wire; also, this tool is used for tightening wires. There are many kinds of pliers, like needle nose pliers, clamping pliers, lineman pliers, and side-cutting pliers.

Cutting Tools: It has a special insulating plastic handle and a steel blade. It is made of a lot of different colors. There are many kinds of cutting tools like cutters, electrician scissors, wire strippers, and hacksaws. These tools are very dangerous because they can cut your hands...

Vehicle Ventilation and Heating Systems

Air Renewal System in the Vehicle Cabin

The cabin air renewal system typically utilizes two primary functions: ventilation and heating.

Ventilation

Ventilation introduces fresh ambient air into the vehicle interior. This process can be achieved passively through the vehicle's movement (ram air effect) or actively enhanced by an electric fan (blower motor). The air passes through ducts, allowing distribution to various cabin positions selected by the driver.

Heating

Heating involves warming the ambient air. This is achieved by passing the air through a radiator (heater core) that carries hot water flowing parallel to it, sourced from the engine's cooling circuit. The heated air is then directed through ducts...

Cable Stringing and Tensioning Techniques

• By Nivelet: Choosing the span for more favorable regulation, placing two on each end of the span at a vertical distance from the fulcrum. Proceed to the tension of the conductor and, with reference to the lowest point of the cable stringing, align this to the mark visually using two levels.
• By Dynamometers: Installed at the point of attachment on the hoist or tension element. Proceed to tension the conductor until the dynamometer reaches the daN (decanewton) mark; once achieved, secure the cable to the anchor points.

Damage and Repair in Underground Networks

Faults are detected by the performance of the installed protection, usually a fuse in the LV (Low Voltage) box located in the Transformer Station (...

The Purpose of Workplace Safety Signaling

Safety signaling is intended to alert workers to potential workplace risks or instruct them on how to avoid these hazards. To be effective, a sign must:

• Attract the attention of the recipient and provide advance notice of the danger.
• Be clear and free of errors.
• Have a single, unambiguous interpretation.
• Convey hazard warnings and information quickly and effectively.

Method and Composition of Signs

Signs use a standardized combination of elements to convey information:

• Geometric Shape
• Safety Color (the primary background color)
• Contrast Color (for the pictogram and text)
• Pictogram (a symbol representing the hazard or instruction)

Types of Safety Signs

• Warning Signs: These signs warn of a risk or danger. They are