This document is a question paper for an Electrical and Machines Engineering examination. It contains 15 multiple choice and numerical problems covering topics like basic rotating electric machines, electromagnetic induction, transformer equivalent circuits, magnetic circuits, electric motor principles and characteristics. Students are required to answer all questions in the paper which is divided into two parts - Part A contains 10 short 2-mark questions, and Part B contains 5 long 16-mark numerical problems.
E L E C T R I C A L M A C H I N E S I I I J N T U M O D E L P A P E R{Wwwguest3f9c6b
This document contains an examination paper for the subject Electrical Machines-III. It has 8 questions covering various topics related to electrical machines like alternators, synchronous motors, induction motors, and stepper motors. The questions test the students' understanding of concepts like armature winding, EMF calculation, load characteristics, synchronization, voltage regulation, and operation of different electric machines. They are required to solve analytical problems and explain concepts with diagrams where needed. The paper is divided into 4 sets with 5 questions each and the students have to answer any 5 questions carrying equal marks from the set chosen.
E L E C T R I C A L M A C H I N E S I I J N T U M O D E L P A P E R{Wwwguest3f9c6b
This document contains questions from an Electrical Machines II exam for a BTech program. It includes 8 multi-part questions related to transformers and induction motors. The questions cover topics such as deriving transformer equations, calculating efficiency, regulation and losses. For induction motors, questions address operation, equivalent circuits, speed control methods and performance characteristics like torque.
This document contains sample questions from previous years' GATE exams related to electrical machines. It includes 20 multiple choice questions covering topics like induction motors, transformers, DC machines, and synchronous machines. The questions are at varying difficulty levels, ranging from one mark to two mark questions. The document also contains explanatory text and diagrams relating to some of the multiple choice questions.
The document provides information about various components and aspects of electrical substations:
1) Stones are used in substations to drain oil from transformers if leaks occur and to prevent weed growth. Devices like synchronous condensers and reactors are used to improve power factor.
2) Minimum phase to phase clearances for 400kV conductors and common components like CVTs, wave traps, and arrestors are identified. Reactors are used to limit short circuit current.
3) Ring main distribution systems are generally used for distribution. Earthing conductivity is affected by various soil factors and emulsifier protection relates to multiple protections like grounding and fire.
The document discusses the structure of matter and electricity at the atomic level. It explains that matter is made up of molecules which are made of atoms, and atoms contain protons, neutrons, and electrons. The three types of materials are conductors, insulators, and semiconductors depending on whether electrons can flow freely. Circuits are made up of components like batteries, resistors, and wires. Resistance is measured in ohms and depends on the material's ability to oppose electron flow. Color codes are used to identify resistor values.
The document contains 40 multiple choice questions and answers related to electrical engineering topics. Some key topics covered include:
- Transformers and how their windings are linked
- Operation of synchronous motors, induction motors, and DC motors
- Motor speed control based on field current and terminal voltage
- Power factors of different motor types
- Generation and transmission voltages
- Transformer voltage regulation
- Stepper motor operation
The questions cover fundamental concepts in electrical circuits, motors, transformers, generators and other power systems components. The objective type questions and answers provide a high-level overview of important electrical engineering concepts.
Electrical engineering objective type questions(www.allexamreview.com) أساأ...Ahmed Mohammed Alhntoshi
UNIT NAME NO OF QNS
1 DC GENERATORS 124
2 DC MOTORS 123
3 TRANSFORMERS 135
4 THREE PHASE INDUCTION MOTORS 101
5 SINGLE PHASE INDUCTION MOTORS 110
6 SYNCHRONOUS MOTORS 124
7 TRANSMISSION AND DISTRIBUTION 102
8 CABLES 56
TOTAL 875
E L E C T R I C A L M A C H I N E S I I I J N T U M O D E L P A P E R{Wwwguest3f9c6b
This document contains an examination paper for the subject Electrical Machines-III. It has 8 questions covering various topics related to electrical machines like alternators, synchronous motors, induction motors, and stepper motors. The questions test the students' understanding of concepts like armature winding, EMF calculation, load characteristics, synchronization, voltage regulation, and operation of different electric machines. They are required to solve analytical problems and explain concepts with diagrams where needed. The paper is divided into 4 sets with 5 questions each and the students have to answer any 5 questions carrying equal marks from the set chosen.
E L E C T R I C A L M A C H I N E S I I J N T U M O D E L P A P E R{Wwwguest3f9c6b
This document contains questions from an Electrical Machines II exam for a BTech program. It includes 8 multi-part questions related to transformers and induction motors. The questions cover topics such as deriving transformer equations, calculating efficiency, regulation and losses. For induction motors, questions address operation, equivalent circuits, speed control methods and performance characteristics like torque.
This document contains sample questions from previous years' GATE exams related to electrical machines. It includes 20 multiple choice questions covering topics like induction motors, transformers, DC machines, and synchronous machines. The questions are at varying difficulty levels, ranging from one mark to two mark questions. The document also contains explanatory text and diagrams relating to some of the multiple choice questions.
The document provides information about various components and aspects of electrical substations:
1) Stones are used in substations to drain oil from transformers if leaks occur and to prevent weed growth. Devices like synchronous condensers and reactors are used to improve power factor.
2) Minimum phase to phase clearances for 400kV conductors and common components like CVTs, wave traps, and arrestors are identified. Reactors are used to limit short circuit current.
3) Ring main distribution systems are generally used for distribution. Earthing conductivity is affected by various soil factors and emulsifier protection relates to multiple protections like grounding and fire.
The document discusses the structure of matter and electricity at the atomic level. It explains that matter is made up of molecules which are made of atoms, and atoms contain protons, neutrons, and electrons. The three types of materials are conductors, insulators, and semiconductors depending on whether electrons can flow freely. Circuits are made up of components like batteries, resistors, and wires. Resistance is measured in ohms and depends on the material's ability to oppose electron flow. Color codes are used to identify resistor values.
The document contains 40 multiple choice questions and answers related to electrical engineering topics. Some key topics covered include:
- Transformers and how their windings are linked
- Operation of synchronous motors, induction motors, and DC motors
- Motor speed control based on field current and terminal voltage
- Power factors of different motor types
- Generation and transmission voltages
- Transformer voltage regulation
- Stepper motor operation
The questions cover fundamental concepts in electrical circuits, motors, transformers, generators and other power systems components. The objective type questions and answers provide a high-level overview of important electrical engineering concepts.
Electrical engineering objective type questions(www.allexamreview.com) أساأ...Ahmed Mohammed Alhntoshi
UNIT NAME NO OF QNS
1 DC GENERATORS 124
2 DC MOTORS 123
3 TRANSFORMERS 135
4 THREE PHASE INDUCTION MOTORS 101
5 SINGLE PHASE INDUCTION MOTORS 110
6 SYNCHRONOUS MOTORS 124
7 TRANSMISSION AND DISTRIBUTION 102
8 CABLES 56
TOTAL 875
The document contains questions and answers related to electrical engineering topics. Some key points:
- Electric traction uses electric power for railways, trams, and trolleys, now using magnetic traction for bullet trains. DC motors are commonly used.
- Electronic chokes can be used to start 40W tube lights with 230V AC/DC without other components like coils.
- "Pu" stands for per unit and is used in power system diagrams to represent components of different ratings on a common scale using base values.
- Thermal power stations obtain steam from boiling water to run turbines coupled to generators to produce electricity.
- Links are used at neutral points to withstand high amps, while
This document contains solutions to physics problems from the 12th CBSE exam. It discusses topics like Lenz's law, electric fields, the photoelectric effect, atomic spectra of hydrogen, rectifiers, and more. The solutions are presented in point form and range from short explanations to longer derivations. Overall, the document provides concise answers and working steps to multiple conceptual and numerical problems in 12th grade physics.
This document contains 69 multiple choice questions about basic electrical engineering and electronics. The questions cover topics such as superposition theorem, parallel and series circuits, transformers, motors, power measurement, semiconductors, and diodes. For each question there are 4 possible answers labeled A through D, and the correct answer is indicated.
(1) The document contains the details of a Physics exam including instructions, questions, and solutions.
(2) It provides short answer and long answer questions on topics in Physics ranging from electromagnetism to semiconductor devices.
(3) The questions assess knowledge of concepts like Lenz's law, photoelectric effect, atomic structure, capacitors, diodes, and transistor amplifiers.
This document contains 40 multiple choice questions from previous GATE exams on the topic of electrical circuits and fields. The questions cover concepts such as circuit analysis, network theorems, capacitors, inductors, RLC circuits, and more. Sample questions test the calculation of current, voltage, power, impedance, and time constants in different circuit configurations.
Cbse class 12 physics sample paper 02 (for 2014)mycbseguide
The document provides a sample physics question paper for Class 12 with 29 questions ranging from 1 to 5 marks. It includes questions from various topics in physics like electromagnetism, optics, modern physics, semiconductor devices, communication systems, and electrical circuits. The paper tests concepts, calculations, principles, diagrams, and applications of concepts across different areas of the physics syllabus. It provides guidelines for time, marks distribution and instructions for answering the questions.
E L E C T R I C A L T E C H N O L O G Y J N T U M O D E L P A P E R{Wwwguest3f9c6b
The document contains information about an electrical technology exam, including:
- The exam code and details such as date, duration, and maximum marks.
- It lists 8 questions related to topics in electrical technology, such as DC machines, transformers, induction motors, and electrical instruments.
- Each question is broken down into multiple parts with detailed calculations and explanations required.
- The questions cover concepts like critical resistance, transformer equivalent circuits, motor starting methods, alternator regulation, and instrument operation.
This document discusses magnetically coupled circuits and transformers. It defines mutual inductance and describes how it allows induction of voltage between coupled coils. It examines energy storage in coupled circuits and the coupling coefficient. Ideal and linear transformers are analyzed, including voltage transformation ratios, impedance matching applications, and using transformers for isolation. Examples are provided for calculating currents, impedances, energy, turns ratios, and matching circuits.
This document provides 30 problems related to calculating forces and torques in magnetic fields. It covers topics like calculating torque on loops and coils using the torque formula, determining required currents and magnetic field strengths, and converting galvanometers into voltmeters and ammeters by adding resistances. The problems involve setting up and solving equations for torque, current, resistance, and magnetic field based on given parameters like loop/coil area, number of turns, angle with the magnetic field, and desired deflection or measurement values.
This document provides a test paper on analog electronics with multiple choice questions and solutions. It begins with an introduction stating it is Test Paper-1 on Analog Electronics from the GATE Multiple Choice Questions ECE source book. It then provides 20 multiple choice questions related to topics in analog electronics like diodes, transistors, op-amps, and filters. Each question is followed by a short solution explaining the reasoning. The questions cover concepts such as diode and transistor biasing, amplifier configurations, filter design, and more.
The document summarizes key concepts about direct current (DC) machines in 7 chapters. Chapter 7 covers DC generator fundamentals, including components, operation principles, magnetic fields, armature windings, electromotive force (EMF), and torque production. It describes generator types such as separately excited, shunt, series, and compound, explaining their winding connections and excitation methods. The chapter also defines important terms and presents equations for EMF, flux, torque, and other variables.
This document contains a multiple choice quiz on electronics concepts. There are 80 questions testing knowledge of topics like atomic structure, circuit elements, Kirchhoff's laws, network analysis methods, instrumentation, energy and power calculations, resistor and capacitor combinations, and circuit analysis. The questions are formatted with a subject code, section numbers, and an indication that it is a practice quiz for multiple choice questions.
The document discusses transformers, including:
1. Transformers allow voltages to be changed for more efficient transmission and use, functioning by inducing a voltage in one coil through a changing magnetic field in another coil.
2. A transformer consists of two coils linked by a magnetic core, with the primary coil connected to the power source and the secondary coil connected to the load.
3. An ideal transformer transfers power efficiently between coils through magnetic coupling, maintaining the same power but changing the voltage and current in inverse proportion based on the coil turn ratios.
This document summarizes key concepts related to AC circuits analysis including capacitors, inductors, and AC power calculations. Some main points:
- Capacitors store energy in electric fields and consist of conducting plates separated by an insulator. Capacitance depends on plate area, distance, and dielectric material. Inductors store energy in magnetic fields and consist of coils of wire. Inductance depends on number of turns, length, and core material.
- The voltage-current relationships for capacitors and inductors involve derivatives with respect to time. Power delivered to capacitors and inductors involves integrating these relationships.
- Equivalent capacitance and inductance can be calculated for combinations of components in series
This document discusses modeling frequency mixers as pseudo two-port devices to aid in their analysis and design. It begins with an introduction to mixers and their use in downconverters. It then presents five theories: (1) an ideal commutator model, (2) a model using Schottky diodes, (3) modeling mixers as two-port devices, (4) modeling them as linear devices, and (5) characterizing them with S-parameters. The document explores the nonlinear behavior of mixers, deriving equations to show the generation of sum and difference frequencies. It also discusses spurious products and techniques for predicting interference-free frequency ranges.
1. The document describes an experiment on a DC shunt generator.
2. It explains how to set up the simulation by connecting a power supply module, DC motor/generator module, and DAQ module in the simulator program. Wiring diagrams and procedures are provided.
3. The purpose of the experiment is to measure the no-load and full-load characteristics of a DC shunt generator and observe how the terminal voltage varies with load current.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Electrical Machines Iii Jntu Model Paper{Www.Studentyogi.Com}guest3f9c6b
This document appears to be an exam for an Electrical Machines course, as it contains 8 multi-part questions related to various electrical machines. The questions cover topics like alternator construction and operation, synchronous generator regulation methods, synchronization of alternators, synchronous motor operation, and single-phase induction motors. Students are instructed to answer any 5 of the 8 questions in the exam, which will last 3 hours and is worth a total of 80 marks.
This document contains solved problems from past years' electrical engineering exams. It includes 6 questions covering various electrical engineering concepts like circuit analysis, electromagnetism, instrumentation, electric machines, and power systems. Some key details include:
- Question 1 involves resistance calculations, Kirchhoff's laws, Thevenin's theorem, and capacitor calculations.
- Question 2 covers electromagnetism concepts like magnetic flux, self-inductance, and inductive circuits.
- Question 3 includes instrument calculations, power factor, and three-phase power systems.
- Questions 4 and 5 involve transformers, electric machines, and power system faults/operation.
- Question 6 discusses semiconductor devices, fuse selection, and
Electrical Machines Ii Jntu Model Paper{Www.Studentyogi.Com}guest3f9c6b
This document appears to contain exam questions and answers for a course on Electrical Machines II. It includes 8 questions related to topics like transformers, induction motors, and their operation. Some sample sub-questions ask students to derive transformer equations, calculate transformer parameters from test data, explain induction motor operation modes, and perform calculations related to induction motor speed control. The document provides detailed questions and answers across multiple pages for students to test their understanding of key electrical machines concepts.
R05010501 B A S I C E L E C T R I C A L E N G I N E E R I N Gguestd436758
The document is a study guide for an exam on basic electrical engineering. It contains 8 questions related to topics like Ampere's law, Faraday's law of induction, capacitors, magnetic circuits, alternating current, transformers, DC generators, induction motors, and electrical instruments. Students are instructed to answer any 5 of the 8 questions in the 3 hour exam.
The document contains questions and answers related to electrical engineering topics. Some key points:
- Electric traction uses electric power for railways, trams, and trolleys, now using magnetic traction for bullet trains. DC motors are commonly used.
- Electronic chokes can be used to start 40W tube lights with 230V AC/DC without other components like coils.
- "Pu" stands for per unit and is used in power system diagrams to represent components of different ratings on a common scale using base values.
- Thermal power stations obtain steam from boiling water to run turbines coupled to generators to produce electricity.
- Links are used at neutral points to withstand high amps, while
This document contains solutions to physics problems from the 12th CBSE exam. It discusses topics like Lenz's law, electric fields, the photoelectric effect, atomic spectra of hydrogen, rectifiers, and more. The solutions are presented in point form and range from short explanations to longer derivations. Overall, the document provides concise answers and working steps to multiple conceptual and numerical problems in 12th grade physics.
This document contains 69 multiple choice questions about basic electrical engineering and electronics. The questions cover topics such as superposition theorem, parallel and series circuits, transformers, motors, power measurement, semiconductors, and diodes. For each question there are 4 possible answers labeled A through D, and the correct answer is indicated.
(1) The document contains the details of a Physics exam including instructions, questions, and solutions.
(2) It provides short answer and long answer questions on topics in Physics ranging from electromagnetism to semiconductor devices.
(3) The questions assess knowledge of concepts like Lenz's law, photoelectric effect, atomic structure, capacitors, diodes, and transistor amplifiers.
This document contains 40 multiple choice questions from previous GATE exams on the topic of electrical circuits and fields. The questions cover concepts such as circuit analysis, network theorems, capacitors, inductors, RLC circuits, and more. Sample questions test the calculation of current, voltage, power, impedance, and time constants in different circuit configurations.
Cbse class 12 physics sample paper 02 (for 2014)mycbseguide
The document provides a sample physics question paper for Class 12 with 29 questions ranging from 1 to 5 marks. It includes questions from various topics in physics like electromagnetism, optics, modern physics, semiconductor devices, communication systems, and electrical circuits. The paper tests concepts, calculations, principles, diagrams, and applications of concepts across different areas of the physics syllabus. It provides guidelines for time, marks distribution and instructions for answering the questions.
E L E C T R I C A L T E C H N O L O G Y J N T U M O D E L P A P E R{Wwwguest3f9c6b
The document contains information about an electrical technology exam, including:
- The exam code and details such as date, duration, and maximum marks.
- It lists 8 questions related to topics in electrical technology, such as DC machines, transformers, induction motors, and electrical instruments.
- Each question is broken down into multiple parts with detailed calculations and explanations required.
- The questions cover concepts like critical resistance, transformer equivalent circuits, motor starting methods, alternator regulation, and instrument operation.
This document discusses magnetically coupled circuits and transformers. It defines mutual inductance and describes how it allows induction of voltage between coupled coils. It examines energy storage in coupled circuits and the coupling coefficient. Ideal and linear transformers are analyzed, including voltage transformation ratios, impedance matching applications, and using transformers for isolation. Examples are provided for calculating currents, impedances, energy, turns ratios, and matching circuits.
This document provides 30 problems related to calculating forces and torques in magnetic fields. It covers topics like calculating torque on loops and coils using the torque formula, determining required currents and magnetic field strengths, and converting galvanometers into voltmeters and ammeters by adding resistances. The problems involve setting up and solving equations for torque, current, resistance, and magnetic field based on given parameters like loop/coil area, number of turns, angle with the magnetic field, and desired deflection or measurement values.
This document provides a test paper on analog electronics with multiple choice questions and solutions. It begins with an introduction stating it is Test Paper-1 on Analog Electronics from the GATE Multiple Choice Questions ECE source book. It then provides 20 multiple choice questions related to topics in analog electronics like diodes, transistors, op-amps, and filters. Each question is followed by a short solution explaining the reasoning. The questions cover concepts such as diode and transistor biasing, amplifier configurations, filter design, and more.
The document summarizes key concepts about direct current (DC) machines in 7 chapters. Chapter 7 covers DC generator fundamentals, including components, operation principles, magnetic fields, armature windings, electromotive force (EMF), and torque production. It describes generator types such as separately excited, shunt, series, and compound, explaining their winding connections and excitation methods. The chapter also defines important terms and presents equations for EMF, flux, torque, and other variables.
This document contains a multiple choice quiz on electronics concepts. There are 80 questions testing knowledge of topics like atomic structure, circuit elements, Kirchhoff's laws, network analysis methods, instrumentation, energy and power calculations, resistor and capacitor combinations, and circuit analysis. The questions are formatted with a subject code, section numbers, and an indication that it is a practice quiz for multiple choice questions.
The document discusses transformers, including:
1. Transformers allow voltages to be changed for more efficient transmission and use, functioning by inducing a voltage in one coil through a changing magnetic field in another coil.
2. A transformer consists of two coils linked by a magnetic core, with the primary coil connected to the power source and the secondary coil connected to the load.
3. An ideal transformer transfers power efficiently between coils through magnetic coupling, maintaining the same power but changing the voltage and current in inverse proportion based on the coil turn ratios.
This document summarizes key concepts related to AC circuits analysis including capacitors, inductors, and AC power calculations. Some main points:
- Capacitors store energy in electric fields and consist of conducting plates separated by an insulator. Capacitance depends on plate area, distance, and dielectric material. Inductors store energy in magnetic fields and consist of coils of wire. Inductance depends on number of turns, length, and core material.
- The voltage-current relationships for capacitors and inductors involve derivatives with respect to time. Power delivered to capacitors and inductors involves integrating these relationships.
- Equivalent capacitance and inductance can be calculated for combinations of components in series
This document discusses modeling frequency mixers as pseudo two-port devices to aid in their analysis and design. It begins with an introduction to mixers and their use in downconverters. It then presents five theories: (1) an ideal commutator model, (2) a model using Schottky diodes, (3) modeling mixers as two-port devices, (4) modeling them as linear devices, and (5) characterizing them with S-parameters. The document explores the nonlinear behavior of mixers, deriving equations to show the generation of sum and difference frequencies. It also discusses spurious products and techniques for predicting interference-free frequency ranges.
1. The document describes an experiment on a DC shunt generator.
2. It explains how to set up the simulation by connecting a power supply module, DC motor/generator module, and DAQ module in the simulator program. Wiring diagrams and procedures are provided.
3. The purpose of the experiment is to measure the no-load and full-load characteristics of a DC shunt generator and observe how the terminal voltage varies with load current.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Electrical Machines Iii Jntu Model Paper{Www.Studentyogi.Com}guest3f9c6b
This document appears to be an exam for an Electrical Machines course, as it contains 8 multi-part questions related to various electrical machines. The questions cover topics like alternator construction and operation, synchronous generator regulation methods, synchronization of alternators, synchronous motor operation, and single-phase induction motors. Students are instructed to answer any 5 of the 8 questions in the exam, which will last 3 hours and is worth a total of 80 marks.
This document contains solved problems from past years' electrical engineering exams. It includes 6 questions covering various electrical engineering concepts like circuit analysis, electromagnetism, instrumentation, electric machines, and power systems. Some key details include:
- Question 1 involves resistance calculations, Kirchhoff's laws, Thevenin's theorem, and capacitor calculations.
- Question 2 covers electromagnetism concepts like magnetic flux, self-inductance, and inductive circuits.
- Question 3 includes instrument calculations, power factor, and three-phase power systems.
- Questions 4 and 5 involve transformers, electric machines, and power system faults/operation.
- Question 6 discusses semiconductor devices, fuse selection, and
Electrical Machines Ii Jntu Model Paper{Www.Studentyogi.Com}guest3f9c6b
This document appears to contain exam questions and answers for a course on Electrical Machines II. It includes 8 questions related to topics like transformers, induction motors, and their operation. Some sample sub-questions ask students to derive transformer equations, calculate transformer parameters from test data, explain induction motor operation modes, and perform calculations related to induction motor speed control. The document provides detailed questions and answers across multiple pages for students to test their understanding of key electrical machines concepts.
R05010501 B A S I C E L E C T R I C A L E N G I N E E R I N Gguestd436758
The document is a study guide for an exam on basic electrical engineering. It contains 8 questions related to topics like Ampere's law, Faraday's law of induction, capacitors, magnetic circuits, alternating current, transformers, DC generators, induction motors, and electrical instruments. Students are instructed to answer any 5 of the 8 questions in the 3 hour exam.
This document contains past exam questions from the Anna University course EE 2355 Design of Electrical Machines. It includes both short 2-mark questions and longer 16-mark questions on topics like specific electric loading, armature reaction reduction methods, transformer design, DC machine design dimensions, induction motor dimensions, and synchronous machine performance parameters like short circuit ratio. The questions cover the design aspects of transformers, DC machines, induction motors, and synchronous machines.
This document contains a model question paper for the Basic Electrical Engineering course with 5 modules and 10 questions. It provides details of the exam such as duration, total marks, and instructions to answer 5 full questions with 1 from each module. The questions cover various topics related to electrical circuits, magnetic circuits, dc motors, ac circuits, transformers, and more. Concepts are tested through calculations, explanations, and derivations with varying mark distributions based on difficulty. Diagrams and circuit representations are included with some questions.
This document appears to be an exam for a physics course in Egypt. It consists of 5 questions with multiple parts each. Question 1 involves circuits, electromagnetism, and factors affecting various physical properties. Question 2 covers concepts like work functions, transistors, magnetism, and galvanometers. Question 3 has multiple choice and diagram questions on topics like circuits, thermodynamics, and photons. Question 4 asks about materials properties and circuit behavior. Question 5 compares different physical phenomena and concepts. The document provides context for a physics exam, covering a wide range of topics through multiple question formats.
This document contains instructions and questions for an assignment on electrical machines. It is divided into four sections, with multiple questions in each section. Section one asks about the properties of ideal and practical transformers, differences between single and three-phase transformers, and calculations related to transformer windings. Section two involves calculations to determine equivalent circuit parameters for a transformer. Section three covers the basic principles and characteristics of DC motors and generators. Section four involves calculations to determine generated electromotive forces in different types of generators under varying conditions.
This document contains four sets of questions for an exam on Basic Electronic Devices and Circuits. Each set contains 8 questions related to topics like electric fields, capacitors, diodes, transistors, amplifiers, and oscillators. The questions test understanding of concepts and involve calculations related to electronic devices and circuits.
Basicelectronicdevicesandcircuits Jntu Model Paper{Www.Studentyogi.Com}guest3f9c6b
This document contains exam questions for the course "Basic Electronic Devices and Circuits". It is divided into 3 sets of questions. The questions cover topics such as:
1) Characteristics of charged particles in electric fields, calculations involving capacitors and electrons.
2) Applications and specifications of p-n junction diodes, characteristics of zener diodes.
3) Calculations involving rectifier circuits, filters, and dc output values.
4) Transistor biasing configurations, calculations of transistor parameters and currents.
5) Amplifier configurations, feedback, input and output impedances, frequency stability of oscillators.
The questions test understanding of fundamental electronic components and circuits through
Basic electronic devices and circuits Jntu Model Paper{Www.Studentyogi.Com}guest3f9c6b
This document contains four sets of questions for an exam on Basic Electronic Devices and Circuits. Each set contains 8 questions related to topics like electric fields, capacitors, diodes, transistors, amplifiers, and oscillators. The questions test understanding of concepts and involve calculations related to electronic circuits and devices.
This document contains an examination for the course Electrical Machines and Drives held at Universiti Tun Hussein Onn Malaysia. It consists of 6 questions testing knowledge of various electric machines including DC machines, transformers, induction motors, synchronous generators, shaded pole motors and reluctance motors. Students are instructed to answer 4 questions out of the 6 in the 2 hour and 12 minute examination.
This document contains physics examination papers from 2008-2012 administered by the Central Board of Secondary Education (CBSE) in Delhi, India. It lists the contents which include CBSE examination papers from Delhi and All India in those years, as well as foreign papers. A sample paper from the 2008 Delhi exam is then provided, consisting of 30 multiple choice questions testing concepts in physics.
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The document contains details regarding the B.E/B.Tech degree examination for the subject of Power Electronics. It includes 20 marks for 10 short answer questions in Part A, 65 marks for 5 long answer questions in Part B, and 15 marks for 1 long answer question in Part C, for a total of 100 marks. The questions cover topics such as snubber circuits, thyristors, rectifiers, choppers, inverters, and AC voltage controllers. The document provides the framework and guidelines for the examination on Power Electronics.
Physics Sample Paper with General Instruction for Class - 12Learning Three Sixty
Learning 360 brings “Physics sample paper” for CLASS – 12. This document also carries 31 questions with solution of each given question for better understanding of the students. Download for free now; http://www.learning360.net/study_hub/1090-2/
This document contains an exam for an Electrical Circuits course, with two parts and five units. Part A contains 10 short answer questions covering various circuit analysis topics like transformations, inductance calculations, power factors, and Fourier transform properties. Part B contains longer problems and explanations across five units: Kirchhoff's laws and induction, three-phase systems, network analysis techniques like nodal analysis, network theorems, and transient responses. Sample problems are provided for each unit involving circuit diagrams and calculations of values like currents, voltages, power, and time-domain circuit analysis.
This document contains 7 problems related to electromagnetic fields and Maxwell's equations. The problems cover topics like calculating inductance of solenoids and toroids when their dimensions change, determining the torque on loops in magnetic fields, calculating self and mutual inductances of coils, and finding the energy stored in an inductor. Detailed solutions are provided for each problem involving the application of relevant equations and substitution of given values.
How to Add Chatter in the odoo 17 ERP ModuleCeline George
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
How to Setup Warehouse & Location in Odoo 17 InventoryCeline George
In this slide, we'll explore how to set up warehouses and locations in Odoo 17 Inventory. This will help us manage our stock effectively, track inventory levels, and streamline warehouse operations.
How to Manage Your Lost Opportunities in Odoo 17 CRMCeline George
Odoo 17 CRM allows us to track why we lose sales opportunities with "Lost Reasons." This helps analyze our sales process and identify areas for improvement. Here's how to configure lost reasons in Odoo 17 CRM
Executive Directors Chat Leveraging AI for Diversity, Equity, and InclusionTechSoup
Let’s explore the intersection of technology and equity in the final session of our DEI series. Discover how AI tools, like ChatGPT, can be used to support and enhance your nonprofit's DEI initiatives. Participants will gain insights into practical AI applications and get tips for leveraging technology to advance their DEI goals.
How to Fix the Import Error in the Odoo 17Celine George
An import error occurs when a program fails to import a module or library, disrupting its execution. In languages like Python, this issue arises when the specified module cannot be found or accessed, hindering the program's functionality. Resolving import errors is crucial for maintaining smooth software operation and uninterrupted development processes.
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
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Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
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it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
1. Reg. No. :
3
Question Paper Code : 11311
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B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2011
Fourth Semester
Electrical and Electronics Engineering
EE 2251 — ELECTRICAL MACHINES — I
(Regulation 2008)
Time : Three hours Maximum : 100 marks
Answer ALL questions
PART A — (10 × 2 = 20 marks)
1.
2.
3
What are the three types of basic rotating electric machines?
A conductor 80 cm long moves at right angle to its length at a constant speed of
30 m/s in a uniform magnetic field of flux density 1.2 T. Find the emf induced
when the conductor motion is normal to the field flux.
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3. Which equivalent circuit parameters can be determined from the open-circuit
test on a transformer?
4. The emf per turn for a single-phase 2200/220 V, 50 Hz transformer is 11 V.
Calculate the number of primary and secondary turns.
5. Based on the principle of conservation of energy, write an energy balance
equation for a motor.
6. What are the three basic principles for the electromechanical energy
conversion?
7. What is magnetic leakage flux?
3
8. Why is the efficiency of a three-phase induction motor less than that of a three-
phase transformer?
9. Draw the circuit model of dc shunt motor.
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10. What is the function of no-volt release in a three-point starter?
2. PART B — (5 × 16 = 80 marks)
3
11. (a) (i) Discuss in detail the magnetic circuits and the electrical analog of
magnetic circuits. (10)
(ii) What is eddy-current? Explain in detail the eddy-current loss. (6)
Or
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(b) (i) Explain the power losses that occur in a magnetic material when it
undergoes cyclic magnetization. (10)
(ii) The total core loss of a specimen of silicon steel is found to be
1500 W at 50 Hz. Keeping the flux density constant the loss
becomes 3000 W when the frequency is raised to 75 Hz. Calculate
separately the hysteresis and eddy current loss at each of those
frequencies. (6)
12. (a) The following data were obtained on a 20 kVA, 50 Hz, 2000/200 V
distribution transformer :
Voltage (V) Current (A) Power (W)
OC test with HV open-circuited
SC test with LV short-circuited 3 200
60
4
10
120
300
Draw the approximate equivalent circuit of the transformer referred to
the HV and LV sides respectively. (16)
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Or
(b) (i) A 3-phase transformer bank consisting of three 1-phase
transformers is used to step-down the voltage of a 3-phase, 6600 V
transmission line. If the primary line current is 10 A, calculate the
secondary line voltage, line current and output kVA for the
following connections :
(1) Y / ∆ and
(2) ∆ / Y . The turn’s ratio is 12. Neglect losses. (8)
(ii) A 20 kVA, 2500/500 V, single-phase transformer has the following
parameters :
3
HV winding : r1 = 8 Ω and x1 = 17 Ω
LV winding : r2 = 0.3 Ω and x2= 0.7 Ω
Find the voltage regulation and the secondary terminal voltage at
full load for a pf of 0.8 lagging and 0.8 leading. The primary voltage
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is held constant at 2500 V. (8)
2 11311
3. 13. (a) (i) Describe the flow of energy in electromechanical devices. (6)
(ii) Discuss about the ‘field energy’ and ‘coenergy’ in magnetic system.
3
(4)
(iii) The magnetic flux density on the surface of an iron face is 1.6 T
which is a typical saturation level value for ferromagnetic material.
Find the force density on the iron face. (6)
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Or
(b) A doubly-excited magnetic field system has coil self- and mutual-
inductances of
L11 = L22 = 2H and L12 = L21 = cos θ
Where θ is the angle between the axes of the coils.
(i) The coils are connected in parallel to a voltage source v = Vm sin ωt .
Derive an expression for the instantaneous torque as a function of
the angular position θ . Find there from the time-average torque.
Evaluate for θ = 30°, v = 100 sin 314t . (8)
(ii)
3
If coil 2 is shorted while coil 1 carries a current of i1 = I m sin ωt ,
derive expressions for the instantaneous and time-average torques.
Compute the value of the time-average torque when θ = 45° and
i1 = 2 sin 314t . (8)
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14. (a) (i) A 3-phase, 50 Hz. star-connected alternator with 2-layer winding is
running at 600 rpm. It has 12 turns/coil, 4 slots/pole/phase and a
coil-pitch of 10 slots. If the flux/pole is 0.035 Wb sinusoidally
distributed, find the phase and line emf’s induced. Assume that the
total turns/phase are series connected. (8)
(ii) A 4-pole, lap-wound dc machine has 728 armature conductors. Its
field winding is excited from a dc source to create an air-gap flux of
32 mWb/pole. The machine (generator) is run from a prime mover
(diesel engine) at 1600 rpm. It supplies a current of 100 A to an
electric load.
(1) Calculate the electromagnetic power developed. (4)
3
(2) What is the mechanical power that is fed from the prime-
mover to the generator? (2)
(3) What is the torque provided by the prime mover? (2)
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Or
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4. (b) (i) A 3-phase, 50 kW, 4-pole, 50 Hz induction motor has a winding (ac)
designed for delta connection. The winding has 24 conductors per
3
slot arranged in 60 slots. The rms value of the line current is 48 A.
Find the fundamental of the mmf wave of phase-A when the current
is passing through its maximum value. What is the speed and peak
value of the resultant mmf/pole? (12)
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(ii) A 4-pole synchronous generator driven at 1500 rpm feeds a 6-pole
induction motor which is loaded to run at a slip of 5%. What is the
motor speed? (4)
15. (a) (i) A 220 V dc generator supplies 4 kW at a terminal voltage of 220 V.
the armature resistance being 0.4 Ω . If the machine is now
operated as a motor at the same terminal voltage with the same
armature current, calculate the ratio of generator speed to motor
speed. Assume that the flux/pole is made to increase by 10% as the
operation is changed over from generator to motor. (6)
(ii) A 220 V, 7.5 kW series motor is mechanically coupled to a fan.
When running at 400 rpm the motor draws 30 A from the mains
(220 V). The torque required by the fan is proportional to the square
motor to be linear.
(1)
3
of speed. Ra = 0.6 Ω , Rse = 0.4 Ω . Neglect armature reaction and
rotational loss. Also assume the magnetization characteristic of the
Determine the power delivered to the fan and torque
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developed by the motor. (5)
(2) Calculate the external resistance to be added in series to the
armature circuit to reduce the fan speed to 200 rpm. (5)
Or
(b) A 250-V dc shunt motor has Rf = 150 Ω and Ra = 0.6 Ω . The motor
operates on no-load with a full field flux at its base speed of 1000 rpm
with Ia = 5 A. If the machine drives a load requiring a torque of 100 Nm,
calculate armature current and speed of motor. If the motor is required to
develop 10 kW at 1200 rpm what is the required value of the external
series resistance in the field circuit? Assume linear magnetization.
Neglect saturation and armature reaction. (16)
3
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