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 Introduction   Army tanks are for defense and attack. These are very powerful machines. These tanks are not like cars because these tanks are big in size tan the car. These tanks move slower than the car. Because tanks weight is much more than cars. The one tanks wight is about 68 tons means 68,000 kg. And one car wight is 1.5 tons means 1,500 kg. These one tank weight is equal to 45 cars. Now we start one by one.                                                             These is Army tank.     1.The main part of tank is called Hull. In hull there are wheal, chain, engine, lights, silencer ,etc.                                                             ...

 Introduction Now a days we are using more Hydraulic System in today`s life. These is simple relatively. These is very powerful machine you also know that. These is very controllable machine compare to others. These machine are mostly use in:       Jcb to make well, to make pipe lines, to make roads,etc.      Bore machine to make bore well.           Cranes to pick heavy loads in factory, in construction, in big garage,etc. How  hydraulic machine works     1.The first thing is used in all hydraulic machine is hydraulic oil. These oil is substance of crude oil. These oil is necessary to work these machine when this oil is not there then it will not work. Hydraulic oil is used because which can not over in less time and it moves easily and not compress at all.                                          ...

Introduction   We know that there are on working fuel cars are there nowadays. But we also know that these cars are polluting the environment. These cars pollution are: Air pollution.       2 . Noise pollution. 1.Air pollution We know that air pollution means which pollutes the air.  Carbon monoxide, hydrocarbons, nitrogen oxides, particles, volatile organic compounds, and sulfur dioxide . These air worms the temperature of the earth. Humans and animals are in some places are suffocated because of this polluted air.                                                                                                                 These air pollutes the air. 2. Noise pollution We kn...

Introduction    We know that on road there are cars. But we know that cars are working on fuel like petrol, diesel.  There are many types of cars in that there are many types of engine.  Now we well learn how does car works.    1. We need petrol, diesel to start the car.     2.Then we need battery to start engine.    3. We need battery to start the engine with help of starter motor.     4. Now also engine will not start because also need oil to start engine.    5. The engine has connected with clutch plate which their between the engine and gearbox. The gear box help to car to put gears in gearbox.     6. From clutch it joint to gearbox. Gearbox helps to car to move in slow, fast and in reverse.     7. From gearbox there is a universal joint which is jointed with housing.     8. The housing helps to move the car.     9. These is joint with wheal.  ...