Science 

Important Features of Mercury

Mercury is a little planet, with an orbital width around a third of our own, found give or take two and 75% light minutes from the Sun. It is approximately 1/twentieth the Earth’s mass and volume, with a surface temperature of -292 to 806 °f (−180 to 430 °c), with the highs at Mercurian high twelve and the lows in holes close to the posts. It is made up of 70% metallic material and 30% silicate material, with a moderately expansive center made up of liquid iron. Regardless of its…

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Science 

Relationship Between Sulfuric Acid and Hydrochloric Acid

Sulfuric corrosive and hydrochloric corrosive are solid acids, both of which are destructive and unsafe in concentrated structure. Sulfuric corrosive, (H2SO4) is a dreary, marginally gooey, slick fluid and is the more perilous of the two. Hydrochloric corrosive, (HCl) is a dry, unscented fluid that a larger number of takes after water than the more thick sulfuric corrosive and is otherwise called muriatic corrosive. The principle association between sulfuric corrosive and hydrochloric corrosive, other than likenesses in properties, is the way that hydrochloric corrosive can be integrated from sulfuric corrosive…

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Science 

Laser Devices Used For Communication

Due to the tremendous advantages and uses of laser devices, there are hundreds of institutes in advance countries, which are engaged in developing different types of laser. It is reliably estimated that new lasers are appearing at the rate of one per month. Days are not far away when laser devices will be used as house hold appliances like electrical appliances, one used now a days. Satellite Communication.    Satellite is a body, orbiting a planet. Satellites are natural as well as artificial. Natural & Artificial Satellites.       Natural satellites are those…

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Science 

Salient Features of Fibre Optics

The salient features are as follows: (a)       Wide Band Width.   It can accommodate number of channels through one media. AT&T’s cable can handle 6000 simultaneous telephone calls, through a pair of cable. Latest WT-4 cable which is made by Bell Labs can handle 2,30,000 channels through a single pair of line. It can handle 2MB/Sec (Million Bits/Sec). With this rate 30 volume of 20th Century Chamber’s Dictionary (1700 pages) can be transmitted in less than a sec. (b)       Attenuation.     In earlier days from 10 db/ km to 2 db/ km attenuation was brought and…

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Science 

Making Successful Communication

Communication means exchange of views. In order to establish Communication we need a transmitter, a receiver and a media. A low frequency signal may be audio, video or other type is modulated inside the transmitter and through a media directed towards the receiver where signal is recovered after detection. The purpose of communication is to convey information from one place to other. Typical Communication Systems.        Communication plays a vital role in flying station. With the help of signal and radio equipment.  ‘Communication links’ are established between ground to air, air…

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Science 

Modulated Terms of Signal

Signal can be modulated in terms of: (a)       Amplitude Modulation (AM).       When the amplitude of high frequency carrier wave is changed in accordance with the intensity of signal, it is called amplitude modulation. In amplitude modulation only the amplitude of the carrier wave is changed in accordance with intensity of signal However, the frequency of modulated wave is remains the same. i.e carrier frequency. Fig shows the principle of amplitude modulation. Fig. ‘b’ shows the audio electrical signal whereas fig ‘a’ shows carrier wave constant amplitude. fig ‘c’ shows amplitude modulated…

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Science 

Peace Time and War Time Applications of Radar

Peace Time / War Time Applications of Radar. Radar has been employed on the ground, in the air, on the sea and in the space. Ground based radars are applied chiefly to the detection and tracking of a/c or space targets. Ship borne radars are used for navigation aid and safety device to locate buoys shorelines and other ships and also observing the aircrafts. Airborne radar may be used to detect targets and ships or land targets. Space radar has assisted in the guidance of spacecraft and remote sensing of the…

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Science 

The Components Of The Pulse Radar and Their Function

The components of the pulse radar and their function in:- (a) Timer. This unit provides sharp trigger or timing pulses of fixed frequency for transmitter and indicators. (b) Pulse Modulator. Once trigger pulse is received from the timer the pulse modulator produces sharp rectangular pulses of HT voltage for fixed duration to bring the transmitter(Tx) Oscillator into conduction. (c) Transmitter. This may is a high power oscillator like magnetrons. This transmitter produces RF energy during the pulse period. The RF energy is fed to antenna via duplexer. (d) Duplexer. Normally a single…

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Science 

Introduction To Radar

Radar is basically a means of gathering information about distant object or targets by streaming electromagnetic waves at them and analyzing their echoes (reflection). It was evolved during the years just before World War II independently and more or less simultaneously in Great Britain, the United States, Germanyand France. At first it was used as an all weather method of detecting an approaching aircraft and for detecting anti-aircraft weapons and later for many other purposes. The words ‘RADAR’ is an acronym coined from the words Radio Detection And Ranging (means…

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Science 

Principle of Electro Magnetism

Electro Magnetism. When a magnetic material like an iron bar placed inside a long coil of insulated wire carrying a strong current, the iron bar will behave like a magnet. The magnet made by this (electric) method is known as electromagnet and this phenomenon is known as electromagnetism. It is capable of raising heavier load than the permanent magnet. The magnetic field around the conductor in which the current is flowing all the lines shown would appear more as continuous in cylindrical or circle form around the conductor as long as…

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