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What are the types of the gear pumps? With neat sketch discuss construction working of any type of gear pump.

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 There are four types of gear pump External Gear Pump Internal Gear Pump Screw Pump Lobe Pump The basic principle of external gear pump is that a pair of gears being driven by an external means. The gear motion generates suction at inlet by creating a partial vacuum which causes fluid to be drawn into the pump housing. The fluid is drawn through the pump and is displaced as the teeth mesh on the outlet side. Construction: External gear pump have two mating gear that are turned in a closely fitted casing. Each gear is mounted on a shaft which is supported on bearing in the end covers. In this drive shaft is coupled to the prime mover. Two ports inlet and outlet are provided directly on the opposite side of the mesh point of the gears. The larger and straight ports are preferred for better performance. The driving shaft is usually connected to the upper gear of the pump. The rotation of the driver gear cause the follower gear to turn. Operation: When the pump starts rotating the rota...
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With neat sketches describe the working principle of Hermetically Sealed Compressor.

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 A hermetic or sealed compressor is one in which both compressor and motor are confined in a single outer welded steel shell. The motor and compressor are directly coupled on the same shaft, with the motor inside the refrigeration circuit. The compressor does exactly as its name says: it compresses the refrigerant. The compressor receives low pressure gas from the evaporator and converts it to  high pressure gas. As mentioned earlier, as the gas is compressed, the temperature rises. The hot refrigerant gas then flows to the condenser. A, refrigerator does not cool items by lowering their original temperatures; instead, an evaporating gas called a refrigerant draws heat away, leaving the surrounding area much colder. Refrigerators and air conditioners both  work on the principle of cooling through evaporation. Sealed or hermetic type, however has no need for the shaft seal. These are usually made in capacities from 0.4 kW to 110 kW. Sealed compressor for R-12 and for 2 are...
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State the working principle of a Parabolic trough collector with a neat sketch.

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  A parabolic trough is a type of solar thermal collector that is straight in one dimension and curved as a parabola in the other two lined with a polished metal mirror. The energy of sunlight which enters the mirror parallel to its plane of symmetry is focused along the focal line, where objects are positioned that are intended to be heated. For example food may be placed at the focal line of a through which causes the food to be cooked when the trough is aimed so the sun is in its plane of symmetry. Further information on the use of parabolic troughs for cooking can be found in the article about solar cookers. For other purpose there is often a tube frequently a Dewar tube which runs the length of the trough at its focal line. The mirror is oriented so that sunlight which it reflects is concentrated on the tube which contains a fluid which is heated to a high temperature by the energy of the sunlight. The hot fluid can be used for many purpose. Often it is piped to a heat engine ...
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