Seasoning of timber

Seasoning of timber: The purpose of seasoning of timber is to remove the excess moisture content in the wood to make it suitable to be used for various purposes. Excess moisture content of the wood can result in uneven shrinkage, warping, twisting etc. Advantages of Seasoning: Wood becomes hard and durable. The density of wood […]

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Screw Jack

Screw Jack: Screw jack is used in applications where linear motion is required. A jack-screw is operated by turning a lead screw. It is a device which is used to lift heavy loads like foundation of a house and large vehicles. It works on the principle of inclined plane. The load usually acts centrally upon it. […]

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Sand molding

Sand molding: Sand molding is a process of making sand mold with the help of pattern. The mold cavity of required shape and size is formed in sand by using pattern of same size and shape. This cavity is known as sand mold. Molten metal is poured in this mold and allowed to solidify. After […]

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Reciprocating engine

Reciprocating engine: The function of the reciprocating engine is to convert the reciprocating motion into rotary motion. It is a simplest from of single slider crank chain mechanism. In reciprocating engine there is one sliding pair and three turning pairs. In figure there are three turning pairs and the sliding pair is formed between the […]

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Production

Production: Production is defined as the process of transforming raw material (Input) into desired shape (Output) by performing a sequence of operations with the use of resources. There are three types of production systems. Job Production: It comes into picture when different orders are received and each order needs special design, special machines and tools. […]

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Principle of conservation of momentum

Principle of conservation of momentum: It states “The total momentum of a system of masses or moving bodies in any direction remains the same, unless it is acted upon by some external force in that direction.”  If two masses m1 and m2 moving with linear velocities v1 and v2 moving in the same collides then they start moving with […]

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Principle of conservation of energy

Principle of conservation of energy: It states “The energy can neither be created nor be destroyed but it can be transformed from one form to another. “ The loss of energy in any form is always accompanied by an equivalent energy increase in another form. The total energy possessed by a moving body is same […]

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Electric Current & Potential difference

Electric Current & Potential difference: Electric Current: Electric current can be defined as the rate of transfer of electric charge across a cross sectional boundary. The current flows opposite to the motion of electrons. It is represented by ‘I’ and its unit is ampere. I = dq/dt Where q is the electric charge. Potential Difference: Potential difference […]

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Photovoltaic effect

Photovoltaic effect: When light with photo energy greater than the band gap value falls on a p-n junction, electron hole pairs are generated and built in barrier separates them from recombination. The separation of carriers produces a forward voltage across the junction. This voltage is called forward as it is opposite of built in voltage. […]

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Pascal’s law

Pascal’s law: Pascal law states that if pressure is applied at any point in a static fluid in a container then there is an equal increase in pressure at every point in the container. i.e. P1 = P2 F1/A1 = F2 /A2

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