Telephony Fundamentals
Definition of Decibel
Unit of measure of sound intensity, corresponding to one tenth of a bel, used to express the relationship between two powers.
Amplifier Circuit Gain
An amplifier circuit provides an output of 15 watts with an input signal of 3 watts. Calculate the circuit gain in decibels.
Answer: I do not know.
Unit of dBm
What is the unit of dBm reference?
Answer: Milliwatts (mW).
Crosstalk
What is crosstalk?
Answer: It is the coupling of signals transmitted through a circuit to another nearby circuit.
Read MoreComputer Memory Types: SIMM, DIMM, RIMM, and Memory Management
SIMM
Stands for “Single In-Line Memory Module.” This is an older type of computer memory. A SIMM is a small circuit board with memory chips. SIMMs use a 32-bit bus, with a voltage consumption of 5 volts. In the case of SIMM, the connectors are only present on one side of the module and are shorted together. SIMMs are always used in matched pairs. The typical SIMM module has 72 pins, measures 4.25 inches in length and one inch in width. SIMM was used in computers with Intel 486 or early processors.
Read MoreFundamentals of Electronic Components: Diodes, Semiconductors, and ICs
What is a Diode and How Is It Formed?
A diode is an element that controls the passage of electric current, allowing it to flow in only one direction. It is formed by the junction of two semiconductor crystals: an N-type cathode (electron-donating) and a P-type anode (electron-accepting).
Reverse Bias in a Diode
In reverse bias, a diode behaves as an insulator, blocking current flow. The negative pole of the power supply is connected to the anode, and the positive pole is connected to the cathode. A
Read MoreMountain Bike Maintenance: Cleaning, Lubrication, and Safety Checks
Washing and Lubrication
This is not only for cars and motorcycles but also for our mountain bikes. To extend the life of your machine and always keep the paint bright and the pieces polished, you have to dedicate some time to washing, working, and lubricating your bike. We will take steps so that once you get to work, you do not leave a corner uncleaned.
- The tools we use include: a brush, a container or can to pour the liquid degreaser, a chain cleaner, a sponge, a bucket, a bottle of dish soap, and
Electrical Installation Maintenance and Repair
Electricity Maintenance and Basic Repairs
Maintenance and basic repairs of electrical installations are essential for building conservation.
Basic Electrical Repair Tools and Components:
Electrician’s knife, pliers (flat and cutting), screwdrivers (Phillips and flathead), screwdriver extension poles, wire fish tape, small hammer, duct tape, wire connectors, etc.
Common Electrical Installation Faults:
Short circuits, caused by accidental contact between two conductors, commonly occur in sockets, switches,
Read MoreMetalworking Manufacturing Processes
Item 14: Manufacturing Operations
Introduction
Manufacturing operations are classified into:
- Hand Tools (filing, sawing)
- Machine Tools (shearing, sawing, drilling, turning, milling, and grinding)
- Factor-cost manufacturing (material loss, energy costs)
Filing
Filing is a manual mechanical operation that shapes metal by removing material. Parts include the ear, body, and tip. Files are classified by shape, size, and type (single or double cut).
Phases:
- Grinding: Uses a coarse file to remove a large amount