The dielectric strength of air is approx: 10 kV/in 20 kV/in 200 kV/in 5000 kV/in Correct answer: b. 20 kV/in ____________ is/are expected to have treeing phenomenon: Capacitors Cables Dielectrics All of these Correct answer: 4. All of these Chubb–Fortescue method of measurement of a.c peak voltage values contains: A capacitor, two diodes, an ammeter, a … Read more
Large power transformers are best protected by: Station type lightning arrestors Distribution type lightning arrestors Line type lightning arrestors None of these Correct answer: 1. Station type lightning arrestors A capacitance-resistance circuit is used to measure the ripple voltages in d.c system. During this process the important condition which should be met is: ω CR >> … Read more
The worst gap for measuring the voltages is: Field gap Sphere gap Rod gap All of these Correct answer: 3. Rod gap Usually Mole’s bridge is used to measure __________ frequency measurements: Low High Both of these None of these Correct answer: 1. Low Impulse tests are performed on transformers: To determine insulation ability against … Read more
The relative dielectric strength of SF6 as compared to air is: 1.5 times 2 times 2.5 times 3 times Correct answer: 2.5 times The correct statement about Paschen’s law states that breakdown voltage of a uniform gap is directly proportional to: Pressure of the gas Separation of electrode Material of electrode All of these 1 … Read more
High Voltage Engineering MCQs Part 2 The first step of transformer Impulse testing is to The first step of transformer Impulse testing is to: Apply an impulse whose magnitude equals 0.75 times the BIL Apply a chopped impulse whose magnitude is 2 times the BIL Apply a full wave impulse whose magnitude is 1.19 times … Read more
Today Electrical Engineering XYZ shares High Voltage Engineering MCQs Part 1 which are important for every Power Engineer, Technician. Go to main HV page for more MCQs on HV Engineering. Let’ start learning: Marx multistage impulse generator model involves Marx multistage impulse generator model involves: High ohmic resistances Low ohmic resistances Both of these None … Read more
Welcome to the world of Industrial Electrical Instrumentation. Today Electrical Engineering XYZ is going to share one of the most advanced, simple and easy to understand book on Industrial Instrumentation. While some portion of this book addresses general engineering industry and sensors. The major portion of the book is focused on Electrical Engineering Industry. Author: … Read more
Our electrical power systems, machines, and equipment deal with various electrical quantities such as voltage, current, resistance, insulation, conduction. An Engineer is always interested in controlling the behaviour of the system based on these parameters. Large electrical industries have various control panels, large machines, SCADA systems, relays, and breakers. Such systems are complex parts of … Read more
Laplace transform is the method which is used to transform a time domain function into s domain. While Laplace transform is a handy technique to solve differential equations, it is widely employed in the electrical control system and modern industries. Today Electrical Engineering XYZ shares the Laplace transforms full formula sheet. This table is very … Read more
Megohmmeter (famous as Megger*) is an electrical instrument used to measure the electrical resistance of insulators. Very often a megger is used to check the insulation of cable jackets, motors, and other high voltage (HV) equipment to ensure the safety of equipment. During its working, the object under test is connected with the probes (terminals) … Read more