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What are the properties of silicon that make it a suitable material for semiconductors?
MCQ on Electrical Measurements | Electrical Engineering
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Explain the electrical and thermal properties of transformer oil those make it suitable as an electrical insulating medium. Answer : ### Introduction: The Dual Role of Transformer Oil Transformer oil, also known as insulating oil, is a highly refined oil that is stable at high temperatures and has excellent ... characteristics are maintained by robust thermal properties over the entire operating life of the transformer....
Digital Electronics | Octal to Decimal Conversion Example
Explain the suitability of copper as an electrical conductor with reference to its mechanical and electrical properties. Answer : ### Introduction Copper is the industry standard for electrical wiring and conductors, and its widespread use is due to an exceptional combination of both electrical and mechanical properties. While ... for decades, making it the superior choice for the vast majority of electrical applications....
For the given orthogonal Matrix, the inverse is, | Electrical Engineering
Compare the casing / capping system of electrical wiring to concealed system of electrical wiring. On the basis of look, cost, life, safety retentivity of material and suitability for locations. Answer : This comparison covers two of the most common methods for electrical wiring in buildings. Here is a detailed comparison of the Casing/Capping system and the Concealed Conduit system based on your ... and safety to the property. It is the standard for modern residential and commercial construction....
Mason's Gain Formula Problem 2 | Electrical and Electronics Engineering | Electrical Engineering
Compare the electrical, mechanical and thermal properties of : i) asbestos (ii) mica (iii) porcelain as an insulating material Answer : ### Classification of Wiring Electrical wiring can be classified based on several criteria, but for installation purposes, it is most commonly classified by the **method of installation and ... is essential for managing the complex electrical needs of kitchens, laundries, and HVAC systems....
Problem on Kirchhoff's Laws 12 | Electrical Engineering
State the properties of copper and aluminium which make them good conductors of electricity. Answer : ### 1. Presence of Delocalized Valence Electrons This is the most fundamental reason. * **What it is:** In metallic bonding, the outermost electrons (valence electrons) of the ... density and lower cost make it a vital material for specific applications like long-distance power transmission....
Superposition Theorem Solved Example | Electric Circuits | Network Analysis | Network Theory
Explain the suitability of aluminum as an electrical conductor with respect to its mechanical and electrical properties. Answer : Aluminum is an excellent and widely used electrical conductor, second only to copper in global usage. Its suitability is a trade-off: it is not as conductive as copper, but its significantly lower ... at a premium and high conductivity in a small package is essential, copper is the superior choice....
Passive devices or components | Electronics Engineering | Electrical Engineering
Write properties of good electrical insulation material. Answer : ### Introduction An electrical insulator is a material used to prevent the flow of electric current. Its primary job is to confine the current to a desired path (like a conductor wire) and to prevent ... *Chemical & UV Resistance**| High | To ensure long life and reliability in harsh environments. |...
Calculation of Impedance and Current in a Series RL Circuit | Alternating Current
In a Hall Effect experiment, a voltage is measured perpendicular to both the current flow and the magnetic field. What is the physical origin of this "Hall Voltage," and what two crucial properties of a semiconductor material can be determined by measuring it? Answer : The physical origin of the Hall Voltage is the **Lorentz force** acting on charge carriers as they move through a magnetic field. This simple experiment is profoundly important because it ... **carrier concentration `n`**, a fundamental parameter that dictates the material's electrical properties....
Electrical Engineering Facts 15
Describe the role of an Analog-to-Digital Converter (ADC) in an embedded system that measures temperature.
What is meant by hydro power plant? | Electrical Engineering
Draw the labeled hysteresis loop for an electromagnetic material. Answer : ![][1] hysteresis loop [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=16263897287610247627...
MCQ on Nuclear Power Plant | Electrical Engineering
Explain the difference between a conductor, an insulator, and a semiconductor based on their energy band structure.
Resonance in Series Circuit Example: Calculating Capacitance, Voltage, and Q-Factor
State significance of earthing. Draw and explain pipe earthing. State the values of earth resistances for : (i) Substation (ii) Residential wiring (iii) H.T. Line (iv) L.T. Line Answer : ### 1. Significance of Earthing Earthing (or grounding) is a fundamental safety measure in any electrical installation. Its primary significance is to protect people, equipment, and property from ... to consumers. [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=3390146307772186646...
What is Impedance? | Phasor or Frequency Domain | Electrical Engineering
Explain the use of the following components in electrical wiring system and give specification of each: (i) MCB (ii) ELCB Answer : ### Introduction In any modern electrical wiring system, safety and protection are paramount. Devices like MCBs and ELCBs are critical safety components installed in a consumer unit (also known as a ... (lighting, sockets, etc.) | Protecting a group of circuits or an entire installation |...
Digital Electronics | Decimal to Binary Conversion
Explain the use of following tools in carrying out electrical wiring installation: (i) Nose pliers (ii) Test lamps (iii) Crimping tools (iv) Cutter. Answer : General Introduction In electrical wiring, using the correct tool for the job is not just about efficiency; it is a fundamental requirement for safety and the quality of the finished installation. A poor ... Do not use them to cut steel wire or screws, as this will damage the cutting edges....
Impedance Parameters of Two Port Network Solved Example | Z Parameter Example | Electric Circuits
What are the primary design considerations for the core and windings of an electrical transformer?
Electric Substation Practices MCQs | Electrical Engineering
Explain the reasons for failure of gaseous and solid dielectric materials used in electrical engineering application. Answer : ### **Introduction to Dielectric Failure** A dielectric material is an electrical insulator that can be polarized by an applied electric field. Its primary function in electrical engineering is to ... Often a slow, aging-related process - Highly sensitive to impurities, voids, and moisture |...
Nodal Analysis Solved Example Problem | Electrical Engineering
Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole. Answer : ### (i) Insulation between heating element and base plate of electric iron. **Selected Material:** **Mica** **Reasoning:** The insulation in an electric iron has a unique set of ... is very lightweight, has a high strength-to-weight ratio, and performs exceptionally well in polluted environments....
Converting Fractional decimal into Binary Example | Electrical Engineering
State failure phenomena observed in insulating material. State four reasons for failure of gaseous and solid dielectric materials. Answer : ### Failure Phenomena in Insulating Materials Insulating materials (dielectrics) are designed to prevent the flow of electric current. Failure occurs when the material loses its insulating properties ... insulation, concentrating the electric field and providing an easy path for breakdown to occur....
MCQ on DC Generators | Electrical Engineering
Define dielectric failure of electrical insulating material. Answer : ### Definition: Dielectric Failure **Dielectric failure**, also known as **dielectric breakdown** or **insulation failure**, is the event where an electrical insulating material, subjected to a sufficiently ... equipment. * **Safety Hazards:** Poses a significant risk of fire and electric shock....
Maintenance of Electrical Equipment MCQs | Electrical Engineering
State the material used for making (1) Magnetic Core (2) Fuse element Answer : ### (1) Magnetic Core The material used for a magnetic core is a **soft magnetic material**, with the specific choice depending on the application (e.g., frequency of the magnetic ... current rating and performance requirements. **Key Properties:** Low melting point and low electrical resistance....
Current Division Rule Problems | 10 Solved Examples on Basic to Advanced Level Current Divider Rule
Explain with justification two uses of each of two following as an electrical conductor: (i) Brass (ii) Silver Answer : ### (i) Brass Brass is an alloy primarily made of copper and zinc. While it is a good electrical conductor, it is not as conductive as pure copper. Its usefulness comes from a ... silver (lowest possible signal loss) while keeping the cost much lower than using a solid silver conductor....
Complex Number Solved Example | Electrical Engineering
The storage battery of a car has an emf of 12V . If the internal resistance of the battery is 0.4 Ohm , what is the maximum current that can be drawn from the battery? Answer : The maximum current that can be drawn from the battery is **30 Amperes (A)**. --- ### Detailed Explanation #### 1. Understand the Concepts * **EMF (Electromotive Force, $\mathcal{E ... even explode. This calculation is a theoretical maximum. **Never attempt to short-circuit a car battery.**...
Current Division Rule in AC Analysis | Sinusoidal Steady State Analysis | Electrical Engineering
Describe the function of an inverter in a power electronics system.
Problem on power 3 | Electrical and Electronics Engineering | Electrical Engineering
State the need for strictly following safety rules while working in electrical installations. Answer : Strictly following safety rules while working in electrical installations is not merely a recommendation; it is an absolute necessity. Electricity is an invisible, powerful, and unforgiving hazard. The rules ... protect the worker, their colleagues, the public, and the property they are working on....
Calculate the value of R which will absorb maximum power from the circuit of Fig.
Describe with sketches the process of laying of underground cables by the drawing in method. Answer : ### **The "Drawing In" Method for Laying Underground Cables** This method involves first installing a system of pipes or conduits (called ducts) underground. The cables are then pulled, or " ... duct system. However, this is often offset by the long-term flexibility and protection it provides....
Resistance, Reactance, Impedance | Electrical Engineering
Describe with reasons the failure of porcelain insulators. Answer : ### **Introduction: The Role of Porcelain Insulators** Porcelain insulators are a critical component in electrical power systems. Their primary functions are twofold: 1. **Electrical Insulation: ... , and maintenance strategies (like insulator washing) to ensure the reliability of the power grid....
Using Zener Diodes in Forward and Reverse Bias: Applications and Characteristics
Why is accurately estimating Indirect Costs (Overhead) and Profit just as critical as correctly calculating the direct costs of labor and material when submitting a competitive and sustainable electrical bid? Answer : This question gets to the heart of what separates a working electrician from a successful electrical contractor. While getting the direct costs right determines the *cost* of a job, getting ... reward the risk involved. All three are indispensable pillars of a successful electrical contracting bid....
Sinusoidal Steady State Analysis | Nodal Analysis With Dependent Source Solved Example
State the procedure for laying / installation of underground cable. Answer : 1) Direct laying Cable: or Trench laying method: ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=2239248645105787017 Procedure: For laying of a cable trench about 1.5m deep ... one cable does not damage the adjacent cable. Only armored cables are used in this method. ...
Power Up Your Business: Top Electrical and Electronics Products You Need | Business
What is the purpose of grounding (earthing) in an electrical installation?
Electrical Engineering Facts 25
Why is insulation resistance testing important for the maintenance of electrical motors?
Source transformation problem solution | Electrical Engineering
What is the primary function of a circuit breaker in an electrical system? Answer : It Cuts the power off in any fault in the circuit such as overloading to protect appliances....
Wye Delta Transformation 6 | Electrical Engineering
What is the purpose of a substation in an electrical power grid?
Mesh Analysis Solved Example | Electrical Engineering
What is the purpose of earthing or grounding in an electrical installation? Answer : The primary and most critical purpose of earthing (or grounding, as it's more commonly called in North America) in an electrical installation is **safety**. It acts as a ... that saves lives and prevents fires by ensuring any dangerous electrical fault is instantly and automatically disconnected....
Calculating Capacitive Reactance, Current, Power Factor & Consumed Power in a RC Series Circuit
Explain the uses of safety rubber hand gloves and rubber mats in electrical engineering. Answer : In electrical engineering, safety is paramount. Two of the most fundamental and critical pieces of Personal Protective Equipment (PPE) are **safety rubber hand gloves** and **insulating rubber ... environment and preventing a worker's body from becoming the path of least resistance for electricity....
Series and Parallel Resistors : Find the equivalent resistance at terminals a b
Give the justification with diagram — "Earthing saves human life during Electrical faults". State adverse effect of improper earthing system. Answer : ![][1] [1]: https://electrical-engineering.app/?qa=blob&qa_blobid=14708590942510254801 Justification of "Earthing saves human life during Electrical faults": As per the above figure ... earthing may cause burns from arcing Tools plugged into improper earthing circuit may become energized. ...
MCQs on Inductor | Electrical Engineering
Why is "active listening" considered a skill that requires conscious effort, and how does it fundamentally differ from simply hearing someone speak or waiting for your turn to talk? Answer : The difference is one of **intent and engagement**. Hearing is a passive, physiological process of perceiving sound. Waiting for your turn to talk is a self-centered debate tactic. Active ... You gain a much deeper and more accurate understanding of the problem, leading to better solutions....
A series R-L circuit takes a current of 2.7 A when connected to 240 V, 50 Hz, AC supply and consumes
Define earthing related to electrical wiring system. Answer : ### Definition of Earthing **Earthing** (also known as **grounding** in North American terminology) is a fundamental safety measure in electrical wiring systems. It is the process of ... to operate immediately. It is a non-negotiable, critical component of any safe electrical installation....
Basic Electrical MCQ | 3 | Electrical Engineering
In C++, what is the fundamental problem that the virtual keyword solves when working with inheritance and pointers, and what is the practical difference in behavior when a base class function is declared with versus without it? Answer : The `virtual` keyword solves the critical problem of **static vs. dynamic binding**, enabling **runtime polymorphism**, which is arguably the most powerful feature of Object-Oriented Programming. In simple terms, `virtual` ... NOTE: No 'virtual' keyword here void draw() { std::cout ...
[Grade 8 Math: Quadratic Equations] How to factorise 20y²-3y-9? | Electrical Engineering
What is the fundamental difference in the physical mechanism and material structure between a Light Emitting Diode (LED) and a Laser Diode, given that both are semiconductor p-n junction devices that convert electricity into light? Answer : The difference lies in the nature of the photon emission process they utilize and the physical structure required to support that process. An LED relies on **Spontaneous Emission** to produce incoherent light, ... data | Fiber optics, barcode scanners, laser pointers, Blu-ray/DVD players |...
A parallel RLC circuit has the node equation | Determine Voltage using Phasor Method | AC circuit
From a physics perspective, what makes a semiconductor like silicon fundamentally different from a conductor like copper or an insulator like glass, and how is this difference exploited to create the essential electronic component, the diode? Answer : The fundamental difference lies in the **electron energy band structure** of the materials, specifically the size of the **band gap**. This unique property of semiconductors allows us to precisely ... and off at will is the foundation of all digital logic and the entire modern electronics industry....
Thevenin's Theorem Problem | Thevenin's Equivalent Circuit | Electrical Engineering
State different types of holders used in wiring installation. Answer : 1. Pendent Holder 2. Batten Holder 3. Angle holder 4. Screwed holder...
Electrical Engineering Facts 61
Describe an experiment to determine the acceleration due to gravity (g) using a simple pendulum.
Decimal to binary conversion | Electrical and Electronics Engineering | Electrical Engineering
In metrology, what is the fundamental difference between accuracy and precision, and why is it possible—and often dangerous—for a measurement to be highly precise but not accurate? Answer : The fundamental difference is that **accuracy** describes the closeness of a measurement to the true value, while **precision** describes the closeness of repeated measurements to each ... . Understanding that a measurement can be consistently wrong is a foundational principle of metrology....
Electrical Engineering | Electrical Machine | DC motor | MCQ 5 | Electrical Engineering
State applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material. Answer : ### (i) Applications of PVC Paper "PVC paper" typically refers to synthetic paper made from Polyvinyl Chloride resin or paper that is heavily coated with PVC. It is not traditional ... inside electrical enclosures and switchgear to support and insulate current-carrying busbars from the metal frame....
Nodal Analysis with Voltage Sources | Electrical Engineering
Explain HRGO and CRGO. State benefits of CRGO for manufacturing of core. Answer : ### **Explanation of HRGO and CRGO** Both HRGO and CRGO are types of "electrical steel" or "silicon steel." Their primary purpose is to be used in the cores of electromagnetic ... smaller, lighter, quieter, and more energy-efficient devices with a longer and more reliable operational lifespan....
Phasors Problem | Alternating Voltage | Integral | Sinusoids | Electrical Engineering
What factors should be considered when estimating the cost of wiring a new residential building?
Audion | Electrical Engineering
What are the key steps involved in conducting an energy audit for a commercial building?
Electrical Engineering Facts 72
State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them. Answer : ### The Importance of Motor Insulation Motor insulation is a critical system of materials that prevents electrical shorts and ensures the motor's longevity and reliability. It prevents current from leaking ... and reliably operate up to the maximum temperature of that class (155°C for Class F)....
Light Dependent Resistor #electronics #electronicsengineering #electricalengineering
What is Orthographic Projection, and what is the fundamental principle that governs the alignment of the standard views (Front, Top, and Right Side) on a 2D engineering drawing? Answer : **Orthographic Projection** is the primary method used in engineering to represent a three-dimensional object on a two-dimensional surface. The core idea is to look at the object from ... the exact 3D object it represents, making it the unambiguous foundation for manufacturing and construction....
Justify the statement IGBT uses a vertically oriented structure | Electrical Engineering
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