Sadi Carnot in 1840 proposed an ideal heat engine which is free from friction had heat losses. He described it using only isothermal and adiabatic processes. He showed that its efficiency would be maximum when heat engine works in an reversible cycle between two heat reservoirs at different temperatures , but its efficiency cannot be … Read more

Sulphur is found widely distributed in earth's crust. It is found in vast underground beds of 99.8% pure uncombined sulphur and in many sulphide minerals such as galena,pyrite ,sphalesite and various calcium, magnesium and other sulphates.Sulphur is also present in organic compounds.It is found in animals and vegetables such as onion, garlic, mustard, eggs, proteins … Read more

Contact Process was developed by knietsch in Germany. Basically it involves the catalytic combination of sulphur and oxygen to form sulphur monooxide (SO), which is then dissolved in water to form sulphuric acid. Various steps in the process are given below:- 1. Production of sulphur dioxide : Sulphur dioxide is produced by burning sulphur or … Read more

The physical or logical layout of the cables and devices that connect the nodes of a network is called topology. There are three basic topologies: Bus , star and ring. Another  less commonly used physical topology is mesh topology.    The mesh topology is most expensive to implement. In a mesh environment, a cable runs … Read more

An output device that produces a hard copy{ printed paper output) is called a printer. It is tangible and permanent. We can make black & white and colored copies with the help of computers. The size of columns or characters in one line is considered as the size of printing. Normally the printers can print … Read more

Video Display unit is the most commonly used output device on most personal computers. Visual display unit is another name for monitor of a computer .There are two basic types of VDUs. First is the typical monitor that you see on a desktop computer which looks like a television screen. This type of monitor uses … Read more

There are several keys to a strong and effective presentation .These include your the way you dress, your speaking style ,the manner in which you keep your audience involved se of visual aids like overhead projectors, flip charts, posters etc and the list goes on. Good public speaking skills along with the use of visual … Read more