The Spectrum-analyzer is a test equipment which shows the signal’s strength(amplitude) when it is varied with respect to a signal-frequency. It provides a graphical representation of the signal’s amplitude as a frequency’s function. This test equipment is very popular among the Radio-analysers as it is one of the “must be” test equipment to analyse a […]
Measuring Instruments
Measuring instruments may be defined as device for determining the value or magnitude of quantity or variable. Measurement generally involves using instruments as physical means of determining a quantity or variable. These instruments serve as an extension of human faculties and enables the man to determine the value of an unknown quantity, which his unaided […]
Galvanic Corrosion
Galvanic corrosion may occur in fresh or salt water. It generally happens whenever two/or more metallic elements having unlike galvanic-voltages connects to each other electrically in the presence of an electrolyte. In other words, it can also be said that Galvanic corrosion is an outcome of the usual property of an active metal (greater in […]
Advantages of Programmable logic controller
The Programmable Logic Controller, PLC is basically a programmed interface in between the field input elements and the final control element. Advantages of PLC Reduced space : PLCs are completely solid state devices and hence are extremely compact in comparison to hard-wired controller where electro-mechanical devices are used. Higher Life and Reliability : These […]
Corrosion
It is generally understood that Corrosion means rust and is treated like an almost universal object of hatred. This word ‘Rust’ has been specifically reserved for iron corrosion. However, Not so many knows that corrosion is such a destructive process which affects almost all metals. Since iron is the first and most extensively used metal […]
Programmable Logic Controller
A Programmable Logic Controller can be defined in many ways. It can be defined as a program controlled electronic equipment with a reprogrammable memory for storing a set of commands which is used for executing exact tasks like logical, arithmetic, timer, counter, and furthermore controlling different processes or machines with the help of analog/digital through digital […]
Process Control
Before going to details of Process control and Automation, Lets understand its basic first. The approach to identify the actual status of ongoing processes at any instance of time, re-analyse the acquired data in accordance with preset rule and guiding principle and consequently carrying out the operation of control element is called Process control. In […]
Oxidation Corrosion
Most of the metals are naturally available in a chemically shared condition which we know as ORE. It is very usual to get an oxide, a carbonate, a sulphide or another compound in nature. In another words, we can say that most of the metals are naturally available in a mixed state. The reason for […]
Degaussing
The potency of a magnetic field is measured in terms of Gauss. Accordingly, if we define Degaussing. We can say that degaussing means the procedure to diminish the potency of a magnetic field. Any ship made from steel or a material having magnetic susceptibility is like a big floating magnet with a very high magnetic […]
Earth’s Magnetic field
We all know that the Earth has its own magnetic field. And it is due to its composition and moreover due to its core. Our Earth’s core is composed of enormously heated metals in molten state under extreme high pressure. If you are an electrical guy, you must have read this before also that application […]
Ship’s permanent magnetic field
The Earth’s magnetic field is the cause of the ship’s permanent magnetic field. The process of constructing a ship in the Earth’s magnetic field generates an appreciable amount of permanent-magnetism in the floating metal structure. Whenever there is a movement of the floating metal structure, the magnetic lines of force also move with it. This […]
Degaussing coils
The potency of a magnetic field is measured in terms of Gauss. And therefore, by definition, degausse means to reduce/eliminate the strength of the magnetic field. Degaussing coils are used to reduce the effect of Earth magnetic field on the ship’s magnetic field. A magnetic mine is activated when the earth’s magnetic field is distorted […]
Ship’s induced magnetism
The magnetic field induced in the floating structure is dependent on the potency of the Earth’s magnetic field and the layout and direction of floating structure w.r.t. the Earth’s magnetic field. As discussed earlier, The ship’s induced magnetism is also a cause of the ship’s magnetic field just like the ship’s permanent magnetism. Ships are […]
Importance of Hull protection
If we go back in history, we can understand that the man has involved himself with works and resources of sea from a long time. He has been continuously improving and producing structures for using it in such harsh conditions. Earlier, structures were manufactured by using Iron. After some time, mankind invented steel and started […]
Hull protection methods
Paints alone cannot accord complete protection to underwater hull. Areas above keel blocks are not always possible to protect by painting. Stern areas suffer erosion due to high turbulence caused by propeller. In these areas, chances of galvanic corrosion are more due to presence of bronze propeller which is directly coupled to mild steel hull […]
Sacrificial Anodes
In this type of system, the ship’s hull is forced to become a cathode with respect to electrodes that are positive with respect to the ship’s hull. The electrodes used for this purpose are Zinc, Magnesium and Aluminium, However, in all the three, Zinc is very popular. These electrodes provide galvanic current and in the […]
Theory behind Impressed current cathodic protection
Impressed current cathodic protection is a method for ship’s hull protection. But, before discussing the Impressed current cathodic protection, its important to know the theory and history of cathodic protection. Cathodic Protection is a method of controlling corrosion and is based on electrochemical process. In this method, the corrosion of the cathode is achieved by […]
Cathode Ray Tube (CRT)
Every one must have seen TV/Computer picture tubes. Have you ever thought, How the display on TV screen comes?? Its all because of the CRT ( of any mode) used in them. CRT denotes for Cathode Ray Tube. In any class of CRT, it consists five fundamental parts: Electron Gun Anodes Horizontal deflection plates Vertical […]
Type of SemiConductors
There are two type of Semiconductors: N type Semiconductor : When we add a minute quantity of pentavalent impurity to a pure semiconductor, then a semiconductor crystal is formed and is known as N type of semiconductor. The combination of pentavalent type impurity to a pure semiconductor offers the availability of a large quantity of free […]
Operation of Impressed current cathodic protection
Earlier, We had discussed about the theory behind the use of Impressed current cathodic protection. To refer the aforesaid post, visit https://electricalfundablog.com/blog/?p=731 . Lets discuss how the operation of Impressed current cathodic protection is carried out practically with equipments. The power to the unit is fed from the 440V AC, 60 Hz, 3 phase supply. However, […]