Printing Final Cutting Dry film Stripping Etching Tin Stripping Q.C. Mechanical Operation * Sheet Cutting :- Measure the size of PCB from film or Artwork. L W Panel Sz. * Board Area PCB Sz. Boarder Area * Laminates or Copper Sheet :1. Glass Epoxy 2. Paper fenolic 3.Teflon 4. Ceramick (CEM) * Glass Epoxy :- Thickness S/S 1.6 35/0 Cu Thickness Insulating Material thickness D/S 0.8-18/18 1.6-18/18
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education *1144188971* COMBINED SCIENCE Paper 2 (Core) 0653/21 October/November 2010 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams‚ graphs‚ tables or rough working
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will be based on these only. (1‚ 2‚ 3‚ 12‚ 13‚ 18‚ 19‚ 21‚ 22‚ 29‚ 31‚ 32‚ 44) 1. A proton beam in an accelerator carries a current of 125 A. If the beam is incident on a target‚ how many protons strike the target in a period of 23.0 s? 2. A copper wire has a circular cross section with a radius of 1.25 mm. (a) If the wire carries a current of 3.70 A‚ find the drift speed of the electrons in this wire. 3. An aluminum wire having a cross-sectional area equal to 4.00 10–6 m2 carries a current
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Title : WORK INSTRUCTION OF VALVE REPAIR AND REFURBISH FOR BTE 16” CLASS 1500-SF CILIPADI VALVE Prepared by: Reviewed by: Approved by: Reviewed by: (SSB 1) Reviewed by: (SSB 2) Sign: Name: Position/Indicator: Date: Repair and Refurbish of Pipeline Valves 1 Scope This recommended practice (RP)provides guidelines for the repair and refurbish of steel ball‚ check‚ gate‚ and plug valves normally use in pipeline applications
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coating a metal object with a thin layer of another metal by means of electrolysis. 2) What is Copper Plating? Copper plating is a coating of copper metal on another material‚ often other metals. Plating is designed to increase durability‚ strength‚ or visual appeal‚ and copper plating specifically is often used to improve heat and electrical conductivity. 3) What are the uses of electro-plating/copper plating? Electroplating is used to give metal objects a better appearance or to protect them
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1) TO STUDY THE VARIATION OF RESISTANCE WITH THE NATURE OF MATERIAL For this Nichrome and copper wires of same length (1m) and area of cross section(0.5mm) are taken. One of them (say nichrome) is connected in the circuit and the rheostat is adjusted to get a voltage(V) in the circuit. The corresponding ammeter reading(I) is noted and the ratio V/I=R is calculated. The procedure is repeated for different values of voltage
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------------------------------------------------- Electroplating Electroplating is a plating process in which metal ions in a solution are moved by an electric field to coat an electrode. The process uses electrical current to reduce cations of a desired material from a solution and coat a conductive object with a thin layer of the material‚ such as a metal. Electroplating is primarily used for depositing a layer of material to bestow a desired property (e.g.‚ abrasion and wear resistance‚ corrosion protection
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Chalcopyrite was the mineral upon which Bronze Age civilizations were built. Within the last century‚ it also became the mineral foundation for our modern electrical age. Our primary source of copper‚ chalcopyrite’s name comes from the Greek words ‘chalkos’ and ‘pyrites’‚ which respectively mean ‘copper’ and ‘striking fire’. With its metallic luster and bright golden color‚ chalcopyrite can fool people into thinking it is gold. It is one of two minerals‚ the other being pyrite‚ that are commonly
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coins — soak in distilled water (the minerals in tap water can further taint the coin’s surface if soaking for a long time) or olive oil — olive oil is a very gentle way to clean coins‚ but you may need to soak them for several weeks. Silver‚ copper‚ and nickel-clad coins can be soaked in distilled water or‚ to remove tough stains‚ white vinegar. A 6-minute soak in lemon juice may also be used on silver coins. This will not only protect the coin but it will help give the coin a finish at the
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Chemistry: Research task 1 5.1- define the terms mineral and ore with reference to economic and non-economic deposits of natural resources The term ‘ore minerals’ is commonly referred to as economic minerals Mineral: naturally occurring compounds. Rocks are mixtures of various minerals. Most minerals are lattice structures‚ both ionic and covalent. Economic minerals have been divided into two main categories: Metalliferous minerals- mined to extract a metal Industrial mineral- either has
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