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air preheater in thermal power plant - function , construction , working ,advantage , disadvantage

definition of air preheater air preheater increase the temperature  of the air. It is most commonly used in thermal power plant. And it is increase the efficiency of the boiler. Working of air preheaters (APH) 1. The hot fuel gas from the economist first enters the air preheater. Then those gases go through the tube to the chimney. The air mass then enters the preheater through the air inlet.  2.  Then both air and fuel gas flow in opposite directions.  3. baffles are provided in the air preheater to provide more time for exchanging heat from fuel gas to air   4. thus heat is absorbed by the air from the fuel gas. 5. this preheater air is supplied to the furnace.  construction   1. A tubular type air preheater is a large number of tube . 2. the fuel gas pass through the tube. 3. air flows over the tube. 4. baffles are provided to pass the air b number of time over the tube.  5. a soot hopper is provided at the bottom to collect the soo...
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Strain gauge || what is strain gauge ? || Working principle of strain gauge || Example-types of strain gauge

what is strain gauge ? A string gauge is a sensor which whose resistance varies with applied force.it converts force, pressure, tension weight e.t.c in to a Electrical resistance which can then be measured like pizo resistive transducer. Working principle of strain gauge : As we applied forced to extend the length of gauge it's cross section area must reduce becouse volume of material remain constant. Then strain gauge is connected to a balanced whiston  bridge but as force is applied on gauge resistance change and bridge becomes unbalanced producing V0                       Gauge factor Gf=1+2Y Y= paison ratio Using gauge factor we determined change in resistance to the modify resistance and then using Wheaton bridge V0 Examples : Gauge factor in semiconductor is 120 Gauge factor in Ni=12 Gauge factor in co=4.9 Gauge factor in pt=5.2 C=10 types of strain gauge 1. Straight strain checks.  2. Layer Rosette strain checks....
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Qualcomm Snapdragon 665 processor - basic information

 Qualcomm Snapdragon processor   The Qualcomm Snapdragon 665 (SM6125) is a quick mid-range ARM-put together SoC generally found with respect to Android tablets and cell phones.  It highlights 8 Kryo 260 centers (hand craft, 64-Digit able) that are partitioned in two bunches.  A quick group of four centers with up to 2 GHz (Kryo 260 Gold - Cortex-A73 derivate) and a force saving proficiency bunch with up to 1.8 GHz (Kryo 260 Silver - Cortex A53 derivate).  The two groups can likewise be utilized together.  Notwithstanding the 8 central processor centers, the SoC incorporates a mid reach Adreno 610 GPU with a LPDDR4 memory regulator (double channel) and supports Wi-Fi (802.11ac + MIMO, at the most.  867 Mbps), Bluetooth 5, and LTE (X12 LTE modem with up to 600 Mbps download and 150 Mbps transfer).
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