DC Generator Question and Answer

DC Generator Question and Answer

DC Generator Components State the operating principle of how a DC generator produces electricity. DC generators operate on the principle that when a coil of wire is rotated in a magnetic field, a voltage is induced in the coil. The amount of voltage induced in the coil is determined by …

Read More »

Electric Generator Questions and Answers

Electric Generator Questions and Answers

AC Generator Working State the purpose of each of the components used in an AC generator. AC generators consist of field windings, permanent magnets, an armature, slip rings, and brushes. Field windings are electromagnets used to produce the stationary magnetic field in a generator. An armature is the movable coil …

Read More »

Basic Electric Motor Questions and Answers

Basic Electric Motor Questions and Answers

AC Motor Types Define AC motor and identify the main parts of an AC motor and state their operating functions. An alternating current (AC) motor is a motor that uses alternating current to produce rotation. The main parts of an AC motor are the rotor and stator. A rotor is …

Read More »

DC Motor | Construction | Parts

DC Motor | Construction | Parts

This article mainly covers DC Motor Construction and its Parts with labelled diagrams. Furthermore, a cutaway view of the DC Motor is presented and discussed in detail.    The main parts of a typical DC motor are: field frame or yoke end-shields and bearings field poles field coils armature and …

Read More »

Electric Motor Parts and Construction

Electric Motor parts components construction

Electric machines are split into groups based on the type of electricity they require, DC, AC, single phase or three phase, and on their basic mechanical structure. The following types are all used, though not all are common. Rotating Cylinder By far the most common type has a rotating part …

Read More »

Special Transformers and Applications

Special Transformers and Applications

Instrument Transformers It is unsafe to connect instruments and allied equipment to high voltage and current circuits, so instrument transformers are used to reduce these voltages and currents to safer, more convenient values. The two types of instrument transformers used are potential and current transformers. Figure 1(overleaf) shows how a voltmeter, …

Read More »

Parallel Operation of Transformers

Transformer Compatibility When connecting three-phase transformers in parallel, the two transformers should have the same transformation ratio, phase sequence and internal phase shifts. The two transformers are assumed to have their primary windings connected to the same supply. Care must be taken to ensure that the transformers have compatible internal …

Read More »

Understanding Transformer Polarity

Understanding Transformer Polarity

It is sometimes necessary to operate two or more transformers in parallel and to do so, not only must the output voltages be equal but the instantaneous polarities must be the same. Single-Phase Transformers Equal voltages When two unequal voltage sources are connected in parallel, the phasor difference between the …

Read More »

Tap Changing Transformer in Power System

Tap Changing Transformer in Power System

With long-distance transmission lines the characteristics of the line affect the voltage at the delivery end of the line. The conductors have an inherent capacitance between them and there is an inductive effect due to the length of the parallel conductors. Each conductor also has a fixed value of resistance. …

Read More »

Transformer Losses and Efficiency

Transformer Losses and Efficiency | Iron & Copper Losses in Transformer

Iron Losses Eddy Currents The magnetic core of a transformer consists of many laminations of a high-grade silicon steel of a definite thickness. The power absorbed by the core of a transformer is due to eddy currents and hysteresis and is called iron losses. When the alternating flux cuts the …

Read More »

Transformer Operating Principle

Transformer Operating Principle | No-Load and On-Load Condition Phasor Diagram

The primary and secondary windings and the magnetic core of the transformer are all stationary with respect to each other. The primary winding is connected to an alternating supply causing an alternating magnetic flux to be produced in the magnetic core (i.e. the magnitude of the flux is changing with …

Read More »

Transformation Ratio of Transformer

Transformation Ratios of Transformer

This article covers various transformation ratios of a transformer such as voltage (turns) ratio, current ratio, and impedance ratio (matching) in detail along with solved examples. Voltage (Turns) Ratio The mutual flux is common to each winding. Therefore, it must induce the same voltage per turn in each winding. If V1′ is …

Read More »

Network Attacks

Network Attacks | Types | How to Prevent

Introduction In this lesson, you will learn about the various threats that an attacker can launch against a network. Attacks on a specific protocol or service are attempts to take advantage of a specific feature or to use the protocol or service in a way that was not intended. You …

Read More »

Battery Maintenance Checklist

Battery Maintenance Checklist

A maintenance routine is recommended in order to achieve maximum service life from batteries. Checklist to observe is as follows: 1. Ensure that all terminal lugs are clean and tight, to give good electrical contact. 2. Ensure that connecting straps and cables are of a suitable material and in good …

Read More »

Battery Specifications Explained | Parameters

battery specifications explained

In order to compare batteries, an electrician must first know what parameters (specifications) to consider. Terminal Voltage The most identifiable measure of a cell is the ‘terminal voltage’, which at first may seem too obvious to be so simple. In fact, the terminal voltage can change dramatically as a cell …

Read More »