Compression occurs within the cylinder as a four-part cycle that occ.pdf

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Compression occurs within the cylinder as a four-part cycle that occurs with each advance and retreat of the piston (two strokes per cycle). The four parts of the cycle are compression, discharge, expansion and intake. They are shown graphically with pressure vs. volume plotted in what is known as a P-V diagram. Explain the sequence in the reciprocating piston movement with respect to the diagram below. Advanced Diploma of Mechanical Engi Receiver Pressure Inlet Pressure Stroke PLV Diagram. Solution 4-1:Isobaric expanison takes place the cylinder breathes in air through the inlet valvesThe piston move from top dead centre(TDC) to bottom dead centr(BDC).When trapped air in the clearance space is expanded to atmospheric pressure, further downward movement of the piston creates a vacuum inside the cylinder and thereby atmospheric air enters through suction valve 1-2:isentropic compression:The inlet valve and exit valve are closed.The piston moves from BDC towards TDC. 2-3: As piston approaches TDC discharge valve opens and compressed air is delivered 3-4:Undelivered air trapped in the clearance space is expanded as piston moves down.

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Hand geometry 1. Definition 2. Importance 3. Advantages and disadvantages Signature recognition 1. Definition 2. Importance 3. Advantages and disadvantages Hand geometry 1. Definition 2. Importance 3. Advantages and disadvantages Signature recognition 1. Definition 2. Importance 3. Advantages and disadvantages 1. Definition 2. Importance 3. Advantages and disadvantages Signature recognition 1. Definition 2. Importance 3. Advantages and disadvantages Solution Hand geometry (1) Definition Hand geometry readers measure a user\'s hand along many dimensions and compare those measurements to measurements stored in a file. Hand geometry is a biometric that identifies users by the shape of their hands. Hand geometry is not thought to be as unique as fingerprints, palm veins or irises, fingerprinting, palm veins and iris recognition remain the preferred technology for high-security applications. (2) Importance Hand geometry biometrics is not a new technique. It is first mentioned in the early 70’s of the 20th century and it is older than palm print which is part of dactiloscopy. This technique is widely accepted and the verification includes simple data processing. Hand geometry is an ideal candidate for research and development of new acquisition, preprocessing and verification techniques. (3) Advantages Disadvantages Signature Recognition (1) Definition Biometric identification by automatically scanning a person\'s signature and matching it electronically against a library of own signature. It is a behavioural biometric. It can be operated in two different ways: Static: In this mode, users write their signature on paper, digitize it through an optical scanner or a camera, and the biometric system recognizes the signature analyzing its shape. (2) Importance (3) Advantages Disadvantages.

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