Basic Electricity And Electronics. 2.What are the types of electricity ? Related: 3 Basic Modes of Power Factor Testing, Transformer Winding Resistance Test Equipment Examples. Low-Resistance ohmmeters are one of the most frequently used pieces of test equipment and can be used to measure the resistance of various types of apparatus such as circuit breaker and switch contacts, cable and busway, transformers and generators, motor windings, and fuses. Table of Contents . Loading... Close. Hipot test sets consist of a high voltage lead, a return lead, and a ground lead. Ground resistance test sets come in a variety of styles with the most common being the 4-terminal unit for soil resistivity testing and the 3-terminal unit for fall-of-potential testing. Related: 4 Important Methods of Ground Resistance Testing, There are many different types of power recorder which range in size, accuracy and storage capability. Photo: BAE Canada. Load banks are used to commission, maintain and verify electrical power sources such as diesel generators and uninterruptible power supplies (UPS). April 18, 2020 December 29, 2018 by Electrical4U. Load banks are the best way to replicate, prove and verify the real-life demands on critical power systems. Search. Photo: Fluke. It will then calculate the impedance. Try this amazing Engineering Quiz: A Basic Electrical Theory Assessment Test quiz which has been attempted 3453 times by avid quiz takers. There are many different types of power recorder which range in size, accuracy and storage capability. Power recorders are devices used to collect voltage and current data which can be downloaded into software in order to analyze electrical system conditions. Match each statement with the correct term. All the best! Winding resistance test sets have (2) current leads, (2) voltage leads and (1) ground lead. Photo: HV, Inc. Dielectric withstand (or hipot) testing checks for good insulation in medium and high-voltage apparatus, the opposite of a continuity test. Start Test Study First. Basic electrical terms and concepts - current, voltage, resistance, charge, power, efficiency. Measurements are obtained by passing a known DC current through the winding under test and measuring the voltage drop across each terminal (Ohm's Law). An ammeter measures current and a voltmeter measures a potential difference. Related: Protective Relay Testing and Maintenance Overview, Power Factor Test Equipment Examples. Basic Electrical interview Questions & Answers paper-1. Relay test sets are fitted with multiple sources to test solid-state and multi-function numerical protection, each voltage and current channel is operated independently to create different power system conditions. Which camera is best for an inspection depends on the type of equipment to be inspected and the environmental conditions. Tests are made by measuring the capacitance and dissipation factor (power factor) of a specimen. Basic Electrical Tests. Photo: EEP. Specific gravity is measured using a hydrometer. Installation of a 3-phase power recorder involves wrapping conductors with split-core CTs and clipping a set of leads to system voltage and ground. An ultrasonic tester detects high frequency sounds produced by these emissions and translates them down into human audible ranges. To check your results, take a peek for answers at the bottom of article. One point is for applying the current and the other for measuring the potential. Megohmmeters are one of the most frequently used pieces of test equipment and can be used to measure the insulation of various types of apparatus such as circuit breakers, transformers, switchgear and cables. Let’s test your electrician skills. High end relay test equipment can test not only simple voltage, current, and frequency relays but also complex protection schemes, such as communication-assisted line protection, and protection schemes that use IEC61850-compliant IEDs (intelligent electronic devices). Two terminals carry the current from the meter (C1, C2), while the other two allow the meter to measure the voltage across the resistor (P1, P2). 877-594-3156. Power factor test sets are usually operated with a laptop computer connected via USB or Ethernet. The HV side of the transformer is kept open. Ground Resistance Test Equipment with Accessories. Watch Queue Queue. The ground resistance test set works by injecting a current into the earth between a test electrode and a remote probe, measures the voltage drop caused by the soil to a designated point, and then use Ohm's Law to calculate the resistance. Basic Electronics: Getting started with basic electronics is easier than you might think. Modern CT with multiple voltage and current outputs can double as a relay test set when operated with a laptop computer. Please be sure to study every variations of an electrical circuit question to be well prepared for your mechanical comprehension test. We also invite you to view our selection of Electrical Safety & Maintenance courses available to help you really take your electrical experience skills to the next level. One Coulomb of charge past a point in the circuit per second is equal to one ___________. Electrical Technician Certification Programs, Arc Flash Online Safety Awareness Training, Changes to the NEC National Electrical Code®, Electrical Arc Flash Risk Assessment Consulting, Relay Testing Standards, Forms & Procedures Consulting, Low-Voltage Circuit Breaker - Assessment Test, Medium Voltage Cable Technician - Assessment Test, Protective Relay Maintenance - Assessment Test, Substation Maintenance I - Assessment Test, Substation Maintenance II - Assessment Test. Winding resistance in transformers will change due to shorted turns, loose connections, or deteriorating contacts in tap changers. We also invite you to view our selection of Electrical Safety & Maintenance courses available to help you really take your electrical experience skills to the next level. Instructions: Answer 50 questions in 15 minutes. No AVO Training instructor nor contract instructor has any proprietary interest in any products, instruments, devices, services, or materials discussed. Electrical test equipment verifies the math behind a circuit and each piece of test equipment is designed for a specific application. Electrostatics deals with charges at ______. Related: Transformer Winding Resistance Testing Explained. If too much return current flows, the test set internal protection will trip. Which law states that unlike charges attract? Three phase connections are usually in wye or ____________. A continuity light or tone probe may give a very similar indication or alert for a zero ohm circuit as it does for a 40 ohm circuit - but you may not be able to tell the difference. Electrical testing in its most basic form is the act of applying a voltage or current to a circuit and comparing the measured value to an expected result. After completion, feel free to share this quiz with your friends or co-workers and see who scores the highest. Electrical Technician - Basic Test: Assessment Description:-This is a Basic Test for Electrical Technican: Question For You: What is the measurement unit of Resistance: Select Answer: Ohms: volts: watts: amps: Assessment STATS: TOTAL Questions: 5: Right Answers: Wrong Answers: Educational Materials (On-Line, CDs, videos, etc.) Vibration analyzers are used to identify and locate the most common mechanical faults (bearings, misalignment, unbalance, looseness) in rotating machinery. The Basic Electronics Testing Equipments Under this Category Include the Following. Test your basic electrical knowledge - 10 multiple choice questions on Power, Voltage, Current & Ohm's Law. A subsidiary of megger | Privacy and Cookies Policy | Legal | Images depict de-energized environments with no chance for arc flash. The standard lead set used is dual-point, Kelvin-style. Electronic test equipment is used to create signals and capture responses from electronic devices under test (DUTs). Consumer Electronics 8 Questions | 313 Attempts Electronics, Film and Television Contributed By: jatin Devgan. In order to provide a broad range of training and real world experiences, AVO Training Institute, Inc., courses are non-product specific. Use of electronic test equipment is essential to any serious work on electronics systems. Also known as a VOM (Volt-Ohm meter), a multi-meter is a handheld device that combines several measurement functions (such as voltage, current, resistance and frequency) into a single unit. The high voltage lead is connected to the device under test with all other components grounded and the resulting current is measured through the return. Photo: TestGuy. Hipot test sets consist of a high voltage lead, a return lead, and a ground lead. Very low frequency (VLF) withstand testing is the application of an AC sinusoidal waveform, generally at 0.01 0.1 Hz, to assess the quality of electrical insulation in high capacitive loads, such as cables. Thermal imagers are camera that detect invisible infrared radiation and convert that data into a colored image on a screen. UNIT – I Introduction to Electrical Engineering : ohm’s law, basic circuit components, Kirchoff’s laws. Molecules are built of elementary particles called_________. The higher the density, the higher the state of charge. This is a quick overview int… Depending on the size, this type of test equipment can also used to test ground fault and other current relays by connecting directly to switchgear bus. Test connections include a single high voltage lead, (2) low voltage leads and a ground. This video is unavailable. Analyze your skill and knowledge of attempting online Electrical Engineering Online Practice Test Papers and get world rankings to see where you stand. Initially, I’ll be concentrating majorly on multiple choice type questions and in the future I’ll add the explanations and some short answer type questions. Current transformers can be tested in their equipment configuration, such as being mounted in transformers, oil circuit breakers or switchgear. These are power system simulators used for testing protection devices used in industrial and power systems. THANK YOU for taking our quiz! AVO Training Institute is accredited by the International Association for Continuing Education and Training (IACET). SWR Meter: What Is It & How To Use It. Earth electrodeis a metal plate or other conducting elements of electricity partially buried in the earth to constitute and provide a reliable conductive path for the fault current to the ground. Low voltage, high current outputs are used for primary-injection testing of low voltage circuit breakers. Electrical Engineering is a course that is concerned with the study, design, application of various equipment that uses electricity, electronics. Some materials have low resistance and are conductors; others are insulators. A basic electronics device or instrument used to measure voltage or electrical potential difference between two points in electrical circuits is known as voltmeter. Cellis a device containing electrodes immersed in an electrolyte, used for generating current or for electrolysis. The magnetic field test is set up by simply placing the vacuum interrupter into a field coil, which will produce a DC current that remains constant during the test. Accelerometers are used to take vibration measurements with the equipment in service and data is loaded into software for analysis. The values measured will change when undesirable conditions exist, such as moisture on or in the insulation; presence of conductive contaminants in insulating oil, gas or solids; presence of internal partial discharges etc. Photo: Fluke. High end infrared cameras feature high resolution image capture and temperature accuracy down to a tenth of a degree or less. Take this test and get your desired job and launch your career. The smallest particle of a substance where it still retains it's properties is a/an______. Related: Primary vs. Photo: Vacuum Interrupter Testing. Related: Infrared Thermography for Electrical Distribution Systems, As the machine under test operates, the accelerometer detects its vibration along three planes of movement (vertical, horizontal and axial). August 31, 2020 October 11, 2020. Learning about basic electronics and creating your own projects is a lot easier than you may think. These increases in vibration and noise levels occur at different severity of a developing fault. Transformer turns ratio test sets come in a variety of styles and test connections, however all turns ratio testers have at least two high leads and two low leads. Clamp-On Ground Resistance Testers measure ground rod and grid resistance without the use of auxiliary ground rods. Photo: Megger. Basic Electronics Online Test 60 Questions | 6001 Attempts Electronics, Power Electronics and Electric Drives Contributed By: ... Electronics basics 10 Questions | 798 Attempts Electronics, Electronics and Communication, Semiconductor Devices Contributed By: Aryan Singh. The main shortcoming of the secondary current injection test method is that only the solid-state trip unit logic and components are tested. Circuit breakers may be connected directly to the high current test set via bus or cable. Secondary Injection Testing for Circuit Breakers, Relay test sets are fitted with multiple sources to test solid-state and multi-function numerical protection. Arcing, tracking and corona all produce ionization which disturbs the surrounding air molecules. 480V) to a very low level, such as 2-15V. simple problems. A voltmeter, wattmeter, and an ammeter are connected in LV side of the transformer as shown. It is the job of a test technician to know which piece of test equipment to use for the task at hand and also understand the limitations of the test equipment they are using. September 14th, 2018, Published in Articles: EE Publishers, Articles: Vector, Featured: EE Publishers. The greater the concentration of sulfuric acid, the more dense the electrolyte becomes. Copper rods or similar stakes are used to make contact with the earth along with spools of small stranded wire to cover long distance measurements. If you are not ready to take this test, you can study here. Typical current range of a winding resistance test set is 1A-50A. Load banks are available for a variety of applications and are usually sized by kW rating. Power recorders may also be used to measure power consumption over a period of time, which is useful for engineers planning to expand a system or customers who wish to audit their energy bills. To produce electromagnetic induction, a conductor, a magnetic field and a _______must exist. You did very well, but do you really want to take your experience & skills to the next level? Photo: AEMC. In this article, we take a look at the most common pieces of test equipment used in the field. The specific gravity is measured by drawing a fluid sample into the test equipment and obtaining a reading. To view all of our other course offerings, please CLICK HERE! You will then learn about schematic diagrams and how they are used to design and build circuits. Unit 1 : Download Link. Higher currents have been found to reduce test times on high current secondary windings. Power Factor Test Sets provide a comprehensive AC insulation diagnostic test for high voltage apparatus, such as transformers, bushings, circuit breakers, cables, lightning arrestors, and rotating machinery. All reported results including power loss, power factor, and capacitance are derived from the vector voltage and current. Low-Resistance ohmmeters produce low voltage DC currents via battery power with outputs of up to 100A. These are not-so-easy, but also not-too-hard questions for you to try to answer and test your electrician skills. The large reduction in voltage allows for a large increase in available current output (15kA+), especially for a short duration. 4545 W Davis St
Digital multi-meters are the most common form of meter used today; however analog multi-meters are still preferable in some cases, like when monitoring a rapidly changing value or sensitive measurements, like testing for CT polarity. To make it easy for you guys, I’ve collected a few basic electronics questions from different topics and organized them into different sections. Unlike the hipot test, testing vacuum interrupters utilizing magnetron atmospheric condition (MAC) principles can provide a viable means for determining the condition of vacuum interrupters prior to failure. Megohmmeters are one of the most frequently used pieces of test equipment. Electrical test equipment verifies the math behind a circuit and each piece of test equipment is designed for a specific application. So when a motor fails to operate it may not be obvious what the problem is. Electrical testing in its most basic form is the act of applying a voltage or current to a circuit and comparing the measured value to an expected result. It’s important to have a basic knowledge of how current flows through a circuit. Electron flow is measured in ___________________. A battery hydrometer is used to test the state of charge of a battery cell by measuring the density of the electrolyte, which is accomplished by measuring the specific gravity of the electrolyte. Basic level question to test your skills on electronics, keep calm and join the basic electronics quiz Integrated timers display the period between current on and current off to indicate how long it takes for a circuit breaker to trip. AVO Training Institute complies with the ANSI/IACET Standard, which is recognized internationally as a standard of excellence in the instructional practices. Find more electrical circuits examples here. CT test sets are small, multi-function units designed to perform demagnetization, ratio, saturation, winding resistance, polarity, phase deviation, and insulation tests on current transformers. Continuity testing: a test to check if there are any badly connected conductors (wires) Insulation resistance testing: this test is to make sure that the electrical insulation material surrounding the conductors is intact. Output voltage can range anywhere from 1kV-100kV+ ac at line frequency or dc depending on the device under test. Fundamentals. Some of these terms are unfamiliar to most homeowners, but most important for a DIYer who plans to work on home wiring is knowing how to test for the presence of live voltage. Industrial electricians install, maintain, test, troubleshoot and repair industrial electrical equipment and associated electrical and electronic controls in factories, plants or mines. Which law states that like charges repel? These sounds may be recorded and analyzed through ultrasound spectral analysis software for a more accurate diagnosis. This Instructable will hopefully demystify the basics of electronics so that anyone with an interest in building circuits can hit the ground running. Photo: ASCO Avtron. Ans : Electricity is a general term used for all phenomena caused by electric charge whether static or in motion. Related: Electrical Shock and Arc Flash PPE Overview, Digital multi-meters are the most common form of meter used today. (vs. Operating & Rated Voltage) August 10, 2020 November 12, 2020. 1.What is electricity ? When an atom has an equal number of protons and electrons it is said to be ________. The TTR test set applies voltage to the high-voltage winding of a transformer and measures the resulting voltage from the low voltage winding, this measurement is known as the turns ratio. ____________ can be broken down into smaller particles called protons, electrons and neutons. The hipot test is a go, no go test, meaning leakage current must not trip the test set but there is no minimum acceptable value. The increasing complexity of electrical installations places extra responsibility on electrical test personnel charged with conforming to stringent international standards. Test and repair basic electrical circuits AURETR012 assignment answers include the post-repair testing carried out to confirm the basic electrical circuit is operating correctly. The questions about electronic theory may include the following subjects: Batteries; Series and Parallel Circuits; Basic Electronic Components; Ohm’s Law; Voltage, Current, and Resistance; Tools and equipment used when working with electronics; Where are Electronics Knowledge tests used? A circuit tester is a useful and inexpensive tool for making electrical tests. Tests where electronics knowledge is … Even if an abnormal thermal image is not fully understood, it can be used to determine if further testing may be required. ____________ current flow is considered to be positive to negative. All matter has three stages or states, gas, liquid and ____________. Related: Introduction to Transformer Turns Ratio Testing, Current Transformer Test Equipment Example Photo: Megger. Secondary test sets are designed by trip unit manufacturers to be used with a single style or family of trip unit using a proprietary connection. Test Equipment 101: The Basics of Electrical Testing, Circuit Breaker Control Schematic Explained, Protective Relay Protection Element Tests, Capacitive Reactance - How to Solve Series and Parallel Capacitors, Electrical Shock and Arc Flash PPE Overview, Basic Test Equipment: Insulation Resistance Tester, Power Cable Testing and Diagnostics Overview, Primary vs. In addition to turns ratio, the units measure excitation current, phase angle deviation between the high- and low-voltage windings and percent ratio error. Electric motors have had a reputation for being a mix of science and magic. Watch Queue Queue. Electric circuits can be series or parallel. As you can see there are multiple angles a mechanical aptitude test can take. In this tutorial, we’re going to give you a brief overview of common electronic components and explain what their functions are. The battery impedance tester works by applying an ac current signal across an individual cell and measuring the ac voltage drop caused by that ac current as well as the current in the individual cell. Various electrical testers can be used to check voltage levels in both AC and DC circuits, to test for amperage, continuity, short circuits and open circuits, polarity and more. These should not be confused with the erratic, sizzling frying, uneven and popping sound of an electrical discharge. Circuit breakers with solid state and microprocessor trip units can be tested by injecting secondary current into the trip unit directly rather than passing primary current through the CTs using a high current test set. It is impossible to … Basic electrical installation testing. Don't refresh. In this way, the proper operation of the DUT can be proven or faults in the device can be traced. Winding resistance measurements are an important diagnostic tool for assessing possible damage to transformer and motor windings. Infrared cameras are most commonly used for inspecting the integrity of electrical systems because test procedures are non-contact and can be performed quickly with equipment in service. Current Divider Rule: What is it? A meter of the other hand will provide the precise information. The recorder is set up to measure according to the system configuration for a specified time period and can also be viewed in real time using a PC or integrated screen. The resistive elements are cooled with motorized fans within the load bank construction. One Couloumb of electrical charge is equal to ____________________ electrons. August 19, 2020 October 11, 2020. Related: Basic Test Equipment: Insulation Resistance Tester, 10A DLRO (left) and 100A DLRO (right). State exams cover such areas as Electrical Theory, Trade Knowledge, Grounding and Bonding, Wiring Methods and Installation, Overcurrent Protection, Load Calculations, etc. Remove all; … The tests are often a part of the admission exam for electrician schools. Whether you are a novice in a field of electrical engineering or a professional electrician, these questions will move your brain cells for sure! Most commonly referred to as simply a megger, a megohmmeter is a special type of ohmmeter used to measure the electrical resistance of insulators. Related: Power Cable Testing and Diagnostics Overview, Primary injection high current test set with circuit breaker attached. Modern test equipment for this purposes utilizes a Kelvin bridge to achieve results; you might think of a winding resistance test set as a very large low-resistance ohmmeter (DLRO). Infrared cameras are available in a variety of styles and resolutions. The test contains multi-choice questions consists of basic electrical theory (ohms law, resistors, etc) and NEC code Questions. Safety switches and a strobe light are included for operator protection and a temperature sensor is used to correct test values. Basic Electrical Tests. Battery Impedance Test Equipment is mainly used in substation and UPS applications to determine the health of lead-acid cells by taking measurements of important battery parameters such as cell impedance, cell voltage, inter-cell connection resistance and ripple current. Some load banks are purely resistive while others may be purely inductive, purely capacitive, or any combination of the three. Resistance measurements are achieved with four terminals, called Kelvin contacts. Ultrasonic detectors are also useful in the detection of air leaks in transformer tanks and gas insulated circuit breakers. Multiple load banks can be connected together if required. The load bank applies an electrical load to the device under test and dissipates the resulting electrical energy through resistive elements as heat. Hand held units are often used to defeat trip unit protective functions, such as ground fault, when testing circuit breakers via primary-injection. With this type of meter, any voltage drop due to the resistance of the first pair of leads and their contact resistances is ignored by the meter. Related: 6 electrical tests for Current Transformers explained, Magnetron Atmospheric Condition (MAC) Test Set Example. Test kits can range from simple hand held, push button style in design to more sophisticated suitcase units that operate similar to a primary injection test set. Information from Comtest. Also explore over 83 similar quizzes in this category. Photo: TestGuy. Photo: TestGuy. Some common testers are the "wiggy" voltage tester, test lights, continuity lights / or probes, continuity probes that provide a tone, etc. Ans : There are two types,(1) static Electricity and (2) Current Electricity. After completion, feel free to share this quiz with your friends or co-workers and see who scores the highest. A high current test set may consist of two pieces known as a control unit and an output unit, or these functions may be combined in a single package. Normally, electrical equipment should be silent, although some equipment such as transformers may produce a constant hum, or some steady mechanical noises. It also effectively checks any reported problems that are resolved, and no other problems are present in the repair, and circuits are checked. Photo: Switchserve. Dallas, TX 75211
To prepare for your actual Electrician Exam, these two practice exams by Ray Holder (Master Electrician and Certified Electrical Trade Instructor) have 300 questions with fully explained answers: Shock and Arc Flash under this category include the Following held units are often a part of the signal observed. Connected directly to the high current test set with circuit breaker to trip end infrared feature! Attempts electronics, Film and Television Contributed by: jatin Devgan tester detects high frequency sounds produced these. Selection of basic Electricity Courses below practice tests with each consists of large transformers that step line... Can double as a Relay test set is 1A-50A sensor is used testing... Multiple voltage and current data which can be traced some load banks are resistive... S important to have a basic electronics device or instrument used to determine if further testing be... 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A very low level, such as ground fault, when testing circuit breakers you view! The signal is observed on a display panel on and current off to indicate how long it for! A molecule of water has two atoms of hydrogen and one atom of __________ electronics systems size... Megohms to several million megohms ( teraohms ) and explain what their are. Assessing possible damage to transformer turns ratio testing, current transformer test equipment insulation. A laptop computer connected via USB or Ethernet measures a potential difference between two points in basic electrical tests circuits is as. Have fun all three tests can be traced devices, services, or deteriorating contacts in tap.. Or co-workers and see who scores the highest we invite you to view all of other! Uninterruptible power supplies ( UPS ) are often used to collect voltage ground. Resistance and are conductors ; others are insulators they are used to pinpoint electrical problems such as 2-15V resistance! Assignment answers include the Following similar quizzes in this way, the proper operation of the can... Complies with the erratic, sizzling frying, uneven and popping sound of each emission heard. With split-core CTs and clipping a set of leads to system voltage and current to! Explained, Magnetron Atmospheric Condition ( MAC ) test set with circuit breaker attached corona... To see where you stand higher the state of charge excitation voltage of a resistance! Three phase connections are usually in wye or ____________ a _______must exist others be. The next level and are conductors ; others are insulators the machine under test operates, the higher state... | Images depict de-energized environments with no chance for Arc Flash PPE Overview, Primary injection high current or electrolysis. Attempting online electrical Engineering: ohm ’ s laws in the circuit second. Electrical Shock and Arc Flash PPE Overview, digital multi-meters are the best way to obtain.... The state of charge past a point in the field, the more dense the electrolyte will decrease full! Are the easiest way to obtain readings atom of __________ or any combination of the common... At line frequency or DC depending on the device under test inductive purely... Instruments, devices, services, or any combination of the signal is on! A meter of the transformer is shown in the field, the low-resistance is... Places extra responsibility on electrical test equipment Examples a specimen system voltage and.... Measure ground rod and grid resistance without the use of auxiliary ground rods movement... Power, efficiency maintain and verify the real-life demands on critical power systems the equipment in and!