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3-Phase Servo AVR (AC Voltage Stabilizer) — Troubleshooting, Repair & Maintenance By Edwin Ogie • December 18, 2025 • -- AC Voltage Stabilizer — 3-phase servo control type (example from user photo) A practical, step-by-step guide to diagnose, repair and maintain 3-phase servo Automatic Voltage Regulators (AVR) / servo voltage stabilizers. Written in simple terms for technicians and maintenance teams working with generators, UPS rooms and factories. Includes videos, spare-parts list, safety checklist, troubleshooting flow and links to internal/external resources. Contents Why this matters In environments with unstable mains (frequent sags, surges or phase imbalance) a servo AVR protects sensitive equipment by continuously adjusting an autotransformer tap via a small servo motor. A well-maintained stabilizer saves equipment, reduces downtime and prevents costly damage. ...
Definition: Organic chemistry is the study of carbon-based compounds. Unlike the older view that only substances from living organisms were “organic,” today we understand that many such compounds can be synthetically produced from inorganic precursors.
Carbon’s unique ability to catenate (link together) enables the formation of extensive straight, branched, or cyclic chains, often including atoms such as hydrogen, oxygen, nitrogen, and halogens. It also forms single, double, or triple covalent bonds, which greatly increases the diversity of organic molecules.
Chapter One: Carbon-Hydrogen Compounds
1.1 Overview
Hydrocarbons, derived from the words “hydro” (water) and “carbon,” are compounds composed solely of carbon and hydrogen. They form the primary fraction of crude oil—a thick, dark, and viscous liquid. Crude oil is a complex blend that includes gaseous, liquid, and solid alkanes (which can make up to 90% of petroleum), as well as alkenes, cyclic compounds, and aromatic molecules like benzene, ethylbenzene, and naphthalene. In some cases, crude oil also contains oxygen, nitrogen, and sulfur; for example, Nigerian “sweet crude” has minimal sulfur content, thus resulting in reduced pollution.
1.2 Classification Overview
Hydrocarbons can be broadly grouped as saturated or unsaturated. In saturated hydrocarbons (also known as alkanes), every carbon atom’s four bonds are completely fulfilled by single covalent bonds. In contrast, unsaturated hydrocarbons, such as alkenes and alkynes, feature one or more double or triple bonds and are prone to addition reactions.
1.2.1 Saturated Hydrocarbons (Alkanes)
Alkanes are compounds that consist solely of carbon–carbon (C–C) and carbon–hydrogen (C–H) single bonds. Their general formula is CnH2n+2, where n represents the number of carbon atoms. They are also known as paraffins.
1.2.2 Unsaturated Hydrocarbons
Unsaturated compounds include alkenes (with at least one double bond) and alkynes (with at least one triple bond). Their formulas are typically CnH2n (for alkenes) and CnH2n-2 (for alkynes). The key difference lies in the type and number of bonds between the carbon atoms.
1.2.3 Cyclic and Aromatic Compounds
Cyclic hydrocarbons are those in which the terminal carbon atoms of an open chain connect to form a ring. Aromatic hydrocarbons, such as benzene, possess a unique ring structure with resonance stabilization. Additionally, haloalkanes form when one or more hydrogen atoms in an alkane are replaced by halogen atoms (e.g., Cl, Br, F).
Chapter Two: Alcohols (Alkanols)
2.1 Overview
Alcohols, also known as alkanols, are organic compounds containing one or more hydroxyl (-OH) groups. They are classified based on the number of hydroxyl groups (monohydric vs. polyhydric) and exhibit distinct physical and chemical properties.
2.2 Classification and Properties
Alcohols are divided into monohydric (one -OH group) and polyhydric (more than one -OH group) categories. Their physical properties, such as boiling point and solubility, vary with molecular weight and structure, while chemically they can undergo oxidation, dehydration, and substitution reactions.
Chapter Three: Alkanoic Acids
3.1 Overview
Alkanoic acids (commonly known as carboxylic acids) contain a carboxyl (-COOH) functional group. They can be simple or substituted, with dicarboxylic and aromatic acids as special categories. These acids are integral in biological systems and industrial processes.
3.2 General Preparation and Reactions
Alkanoic acids are typically produced by the oxidation of aldehydes or through the hydrolysis of nitriles. They participate in neutralization, esterification, and polymerization reactions, making them essential in both nature and industry.
Chapter Four: IUPAC Nomenclature of Organic Compounds
This section outlines the systematic naming of organic molecules. Names are constructed using a prefix (denoting the number of carbon atoms) and a suffix (indicating the compound’s functional group). For instance:
Carbon Chain Prefixes
Number of Carbons
Prefix
1
meth-
2
eth-
3
prop-
4
but-
Functional Group Suffixes
Compound Class
Suffix
Alkanes
-ane
Alkenes
-ene
Alcohols
-ol
Carboxylic Acids
-oic acid
Note: For fluidity in pronunciation, an extra syllable is often inserted (e.g., “ethanol” rather than “ethol”).
Interactive Quiz
Question 1: Which term best describes compounds composed solely of carbon and hydrogen?
Question 2: In IUPAC nomenclature, what suffix is used for alkenes?
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FORGIVENESS THE SECRET TO A SUCCESSFUL RELATIONSHIP Forgiveness is a critical aspect of human relationships, particularly in marriage. Treating others with mercy and leniency requires you to overlook misunderstandings and the wrongs they have done to you. The capacity to forgive is a fundamental virtue that is the linchpin of safeguarding relationships and leading a flourishing life. Lack of forgiveness causes lots of damage to marriages, and it is often the root cause of divorce in our society. It is, therefore, vital to understand that forgiveness is the key to a lasting, successful, and fulfilling marriage. Before embarking on the journey of marriage, individuals should take responsibility and learn to know themselves deeply. It is essential to realize that marriage is not a walk in the park. It requires perseverance, tenacity, and a loving spirit from the partners involved. When hurt arises, forgiveness is an indispensable tool that partners must employ to calm their difference...
EO Navigating Life’s Complexities Through Self-Consciousness A practical, story-driven guide to building mental resilience, clarity and better relationships in daily life. Expand all Collapse all Print Download .doc Introduction What is Self-Consciousness? Why it Matters The Nigerian Context Stories in Action Root Causes Upbringing & Environment Strategies to Grow Applications Exercises & Plans Scripts & Conversation Frames Resources Conclusion Introduction In a world of constant noise, stress, and social pressure, developing self-consciousness — the steady ability to notice yourself and choose — is essential. This post explains what it is, why it matters (especially in Nigeria), and how to build it with concrete stories...
Mastering the Art of Present Steps for Future Triumphs" In the pursuit of victory, every step forward is pivotal. It's essential to navigate your present position with care, for it is the springboard to your future achievements. How you handle your current endeavors directly impacts the path to your next conquests. Attempting to bypass or disregard your present circumstances can undermine your success in the steps that follow. In the realm of business, strategic maneuvering is essential to attaining your desired goals. Step into Consciousness: Harnessing Experience for Future Benefits Experience serves as our greatest teacher, guiding us towards tomorrow's rewards. Often, we fall into the trap of assuming the world revolves around us, treating our current situations with indifference and overlooking their implications for future outcomes. It's crucial to be mindful of how we approach our present steps, recognizing their significance in shaping tomorrow's victories....
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