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Welding is the process of joining two metals placed together by heating them to melting point. In electric welding, the heat required for welding process is obtained by the use of electrical energy.Factors Considered While Selecting a Welding System for a Particular JobThere are different materials or metals to be welded and different types of welds are required. Therefore, depending upon the metal, its dimensions, and requirements, different welding systems are selected.The following factors are to be considered while evaluating an appropriate welding system to complete a specific job −Types of material (or metal) being weldedThickness of the material.The welding ... Read More
There are various types of electric lamps available in the market. The selection of a lamp depends upon the illumination area.Selection Criteria of Different Electric LampsThe following table highlights the points that you should consider while selecting a lamp depending upon the area to be illuminated.Illumination AreaSuitable Lamp / LampsGeneral house illuminationIncandescent lampsFluorescent lampsCFL (Compact fluorescent lamps)LED (Light Emitting Diode Lamps)Street lightingFluorescent tube lampsSodium vapor lampsMercury vapor lampsLEDsOutdoor lighting of a buildingHalogen lampsLEDsIndustrial lightingHigh pressure mercury vapor lampsMercury iodide lampsCommercial places (like shopping malls)High pressure mercury vapor lampsGreen lightingFluorescent tube lampsLEDsLarge gardensMercury vapor lampsHalogen lampsSodium vapor lampsDecoration of buildingsNeon tube ... Read More
For any business, be it retail, IT or reality, new clients are hard to come by. It often takes months of grueling follow-up with a prospective customer to actually get them on board. This is exactly why it is critical that we value customers we already have and work harder towards attaining fresh clients.Even the leading BPO companies face stiff competition from one another as well as new ventures, thus making customer retention as one of the prime objectives of a business.There are certain companies that are not affected if a customer shifts loyalty. However, the ideal scenario is one ... Read More
A miniature gas discharge lamp in which the electrical discharge takes place through a mixture of gases containing a large proportion of neon gas is known as neon lamp.The working principle of the neon lamp is as follows −“Electrons are emitted from cathode by subjecting the surface of the cathode to very high electric voltage so that the electrons are forcibly ejected from the orbits of the atoms against the nuclear centripetal forces.”Construction of Neon LampThe construction of a typical neon lamp is shown in the figure.The neon lamp has two closely spaced electrodes, but not touching each other, in ... Read More
Types of Railway Services (Classification of Traction Services)Railways offer the following three types of the passenger traction services viz −City or Urban ServiceSuburban ServiceMain Line ServiceCity or Urban Railway ServiceIn the city or urban railway service, there are frequent stops, the distance between these stops being nearly 1 km or less. Therefore, in order to obtain moderately high schedule speed between the stations, it is essential to have high acceleration and retardation.Suburban Railway ServiceIn case suburban railway service, the average distance between the stops ranges from 3 km to 5 km. The suburban railway services require rapid acceleration and retardation ... Read More
Individual Electric DriveIn an electric drive system, if an individual machine is fitted with its own motor and each operator has complete control on their machine, then it is termed as an individual electric drive.Examples − Drill machine, lath machine, etc.Group Drive SystemA group drive system uses a high powered motor to drive a common shaft. When several machines are organized on a single shaft and are driven by a single large motor, this system is known as group drive. Group drive is also known as line shaft drive because a large sized motor (called main motor) drives a common ... Read More
The electric motors that generate power to rotate the wheels of the train are known as traction motors. The turning force produced by the traction motor is transmitted to the wheels of the train through the driving gear unit and axle. Traction motors should have high efficiency.Desirable Characteristics of Traction MotorsThe desirable characteristics and features of the electric motors used for traction purpose are described below.Suitable Speed-Torque CharacteristicsThe traction motor should have suitable speed-torque characteristics. In a traction system, the torque required at start is very high, while during the constant speed, the torque requirement is not high because kinetic ... Read More
An electric lamp is a device that can generate artificial light by consuming electric energy. There are different types of lamps available in the market, which include −Incandescent LampFluorescent LampCompact Fluorescent LampSodium Vapor LampMercury Vapor LampHalogen LampMetal Halide LampNeon LampLED LampLASER LampIn this article, we will compare and contrast the various features of these lamps.Incandescent Lamp vs. Fluorescent Lamp vs. CFLThe following table compares the features of incandescent lamp, fluorescent lamp, and CFL.Basis of ComparisonIncandescent LampFluorescent LampCFLPrinciple of operationHeating effect of electric currentGas discharge (or ionization of gas by electric current)Gas dischargeColor of light emittedYellowWhiteWhiteProduction of heat during operationMoreLessModerateCostLessMoreMoreNeed of ... Read More
The IT industry is quite vast and evolving by leaps and bounds every year. There is no specific technology that you learn and start believing that your future is secured. You need to constantly move with the trend and it largely depends on your interest, in which area of IT, you want to excel like, software development, system administrator, database administrator (DBA), researcher, quality analyst (QA), web designer and web developer among others.The Whole Stream Is OpenA developer develops or builds systems and websites using computer programming languages and frameworks. You should be specializing in language or platform in which ... Read More
Web HostingWeb Hosting is a service that allows companies and individuals to establish a website or web page onto the Internet. A web hosting service provider or a web host is a business that offers the technologies and services required for the website or webpage to be viewed whenever a user wants to view it through the Internet.How Does It Work?Special computers vastly known as servers store these websites and pages and help to access and view whenever they get the command. Their computers get connected to their server and your web pages will be delivered to their screen through ... Read More