101 BASICS SERIES LEARNING MODULE 19: STARTERS AND CONTACTORS Cutler-Hammer STARTERS WELCOME Welcome to Module 19‚ which is about starters‚ devices that control the use of electrical power to equipment‚ usually a motor. As the name implies‚ starters “start” motors. They can also stop them‚ reverse them‚ accelerate them‚ and protect them. Starters are made from two building blocks‚ contactors and overload protection: • Contactors control the electric current to the motor. Their function is
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8. A sum of $2.45 is composed of nickels and quarters‚ there being twice as many as nickels as quarters. How many quarters are there? 10. How many ounces of pure nickel must be added to 150 ounces of alloy 70 per cent pure to make an alloy which is 85 per cent pure? 12. How much water must be added to 200 gallons of mixture which is 80 per cent alcohol to reduce it to a 75 per cent mixture? 14. The attendance at a moving picture
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beneficial to people. One of its usages is in its form of antimony trioxide‚ is made into a flame retardant frequently used in toys and seat covers. Of its many functions‚ antimony is commonly used as an alloy to make other metals stronger. It is primarily alloyed with lead to make it harder. Its alloys are frequently used in batteries and cables. It is also used in some food packaging‚ usually used as a catalyst in manufacturing polyethylen terephthalate.
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10. The gravimetric determination of nickel in alloys Gravimetric analyses belong to the most precise‚ because contemporary analytical balances make possible determination of the mass of a sample with great accuracy. In these analyses one should obtain high purity compound of the analyzed element or a compound directly obtained from the analyzed substance). This reaction has to be exactly stoichiometric. It is also important that the weighed compound was non-hydroscopic and stable in air‚ it also
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The 7 Most Common Metalloids Boron Silicon Germanium Arsenic Antimony Tellurium Polonium Their Uses: Boron -Amorphous boron is used in pyrotechnic flares to provide a distinctive green colour‚ and in rockets as an igniter. The most important compounds of boron are boric (or boracic) acid‚ widely used as a mild antiseptic‚ and borax which serves as a cleansing flux in welding and as a water softener in washing powders. Boron compounds are also extensively used in the manufacture of borosilicate
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Wire A wire is a single‚ usually cylindrical‚ flexible strand or rod of metal. Wires are used to bear mechanical loads or electricity and telecommunications signals. Wire is commonly formed by drawing the metal through a hole in a die or draw plate. Standard sizes are determined by various wire gauges. The term wire is also used more loosely to refer to a bundle of such strands‚ as in ’multistranded wire’‚ which is more correctly termed a wire rope in mechanics‚ or a cable in electricity. Although
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0.1370 220 87.0 0.1120 0.1371 310 100.7 0.1001 0.1371 4.9 Calculate the composition‚ in weight percent‚ of an alloy that contains 105 kg of iron‚ 0.2 kg of carbon‚ and 1.0 kg of chromium. 4.22 Sometimes it is desirable to be able to determine the weight of one element C1 that will produce a specified concentration in terms of the number of atoms per cubic centimeter‚ N1‚ for alloy composed of two types of atoms. 4.26 Cite the relative Burgers
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slope of the line equals the density of one penny. 3. The density of copper is 8.89‚ while the density of the Pre-1982 Pennies is 8.17. This means that although the penny’s density is close to that of copper‚ the penny is not all copper‚ but an alloy made up of different metals‚ but primarily of copper. 4. The density of the Post-1983 Pennies is 7.11. The metal Zinc is close to having the same density as these pennies because it has a
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. . . . . . . . . . . . . 13-4 Molding Equipment and Mechanization . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-6 Molding Sand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-6 Casting Alloys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-7 Melting and Heat Treating Furnaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-8 Cleaning and Inspection . . . . . . . . . . . . .
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Mathematics Department Tutorial Sheet No. 3 MAL250(Probability and Stochastic Processes) 1. The percentage of alcohol (100X ) in a certain compound may be considered as a random variable‚ where X (0 < X < 1) has pdf fX (x) = 20x3 (1 − x)‚ 0 < x < 1. Suppose that the selling price of the above compound depends on the alcohol contents. Specifically‚ if 1/3 < X < 2/3‚ the compound sells for c1 dollars/gallon otherwise it sells for c2 dollars/gallon. If the cost is c3 dollars/gallon‚ find the probability
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