December 2016

Introduction:

C is a general-purpose high level language that was originally developed by Dennis Ritchie for the Unix operating system. It was first implemented on the Digital Equipment Corporation PDP-11 computer in 1972.

The Unix operating system and virtually all Unix applications are written in the C language. C has now become a widely used professional language for various reasons.

Easy to learn

Structured language

It produces efficient programs.

It can handle low-level activities.

It can be compiled on a variety of computers.

Facts about C

C was invented to write an operating system called UNIX.

C is a successor of B language which was introduced around 1970

The language was formalized in 1988 by the American National Standard Institue (ANSI).

By 1973 UNIX OS almost totally written in C.

Today C is the most widely used System Programming Language.

Most of the state of the art software have been…

Techo Stars

For the simple construction of a transformer, you must need two coils having mutual inductance and a laminated steel core. The two coils are insulated from each other and from the steel core. The device will also need some suitable container for the assembled core and windings, a medium with which the core and its windings from its container can be insulated.

In order to insulate and to bring out the terminals of the winding from the tank, apt bushings that are made from either porcelain or capacitor type must be used.

In all transformers that are used commercially, the core is made out of transformer sheet steel laminations assembled to provide a continuous magnetic path with minimum of air-gap included. The steel should have high permeability and low hysteresis loss. For this to happen, the steel should be made of high silicon content and must also be heat treated…

View original post 500 more words

Techo Stars

When a sinusoidal voltage is applied to the primary winding of a transformer, alternating flux ϕ_m sets up in the iron core of the transformer. This sinusoidal flux links with both primary and secondary winding. The function of flux is a sine function. The rate of change of flux with respect to time is derived mathematically.

emf-eq-of-transformer-compressor

Let

ϕ_m be the maximum value of flux in Weber
f be the supply frequency in Hz
N₁ is the number of turns in the primary winding
N₂is the number of turns in the secondary winding
Φ is the flux per turn in Weber
As shown in the above figure that the flux changes from + ϕ_m to – ϕ_m in half a cycle of 1/2f seconds.

By Faraday’s Law

Let E₁ is the emf induced in the primary winding
emf-eq-1