electrical equipment and service
Practical Troubleshooting of Electrical Equipment and Control Circuits pptx
Ngày tải lên :
07/03/2014, 08:20
... as and when required 2 Devices, symbols, and circuits Objectives • To understand basic electrical symbols • To understand power and control circuits • To read electrical drawings 2.1 Devices and ... troubleshooting electrical equipment and control circuits, it is important to understand the basic principles on which the electrical equipment works The following sections will outline the basic electrical ... symbols 24 2.2 Electrical circuits 24 2.3 Reading and understanding electrical drawings 28 2.4 Reading and understanding ladder logic 36 2.5 Wires and terminal numbering...
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Electrical equipment handbook troubleshooting and maintenance
Ngày tải lên :
27/12/2013, 13:18
... power plant has two natures iR and iL Equipment such as motors, welders, and fluorescent lights require both types of currents However, equipment such as heaters and incandescent bulbs require the ... proportional to the electrical resistivity of the material The thickness of the laminations is between 0.5 and mm in power equipment and between 0.01 and 0.5 mm in electronic equipment The volume ... terminals a and b′, b and c′, and c and a′ are joined to form the delta connection In the wye connection (Fig 1.29a), the voltages across the individual phases are identified as Va′a, Vb′b, and Vc′c...
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COMPETITION AND COLLUSION IN ELECTRICAL EQUIPMENT MARKETS: AN ECONOMIC ASSESSMENT docx
Ngày tải lên :
23/03/2014, 23:20
... widespread price fixing and antitrust prosecution of electrical- equipment companies and executives, and an opportunity existed to estimate the impacts of the conspiracy and of the remedies Using ... historical standards, these penalties were severe, likely to have a significant impact on seller For a description of the electrical equipment conspiracies, see Herling (1962) and Walton and Cleveland ... excess demand, while negative deviations indicate idle plant and equipment We expect profit/sales ratios to be positively related to excess demand, as measured by GROWDEV.l Electrical- equipment- product...
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Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science
Ngày tải lên :
25/04/2013, 08:07
... a t e random number i n [ , ) ∗/ double r e t = ( double ) rand ( ) ; return r e t / (RAND MAX+1); } i n t s a m p l e g e o m e t r i c r v ( double p ) { double q ; i n t n = ; { q = rand double ... done and ready to compile your code Write the command line that you should use to compile this code (using gcc) Let’s call the desired output program dictionary.o Problem 3.3 Both the for loop and ... is a unix utility that display the count of characters, words and lines present in a file If no file is specified it reads from the standard input If more than one file name is specified it displays...
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Process technology equipment and systems chapter 1 & 2
Ngày tải lên :
15/08/2013, 07:50
... refineries and plants for petrochemical, paper and pulp, power generation, and food processing Process technicians inspect and maintain equipment, place and remove equipment from service, complete ... Compressor systems and operations • Heat exchanger and cooling tower systems and operations • Steam generation and furnace systems and operations • Reactor systems and operations Key concepts and learning ... withstand 10 Stationary Equipment high-pressure situations; carbon seals and labyrinth seals cannot Shaft seals minimize air leakage into and out of the equipment; keep dirt, chemicals, and water...
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Process technology equipment and systems chapter 3 & 4
Ngày tải lên :
16/08/2013, 15:29
... cylindrical tanks (drums), bins, and tanks with fixed and floating roofs Tanks, drums, and vessels are typically classified as low pressure, high pressure, liquid service, gas service, insulated, steam ... exceeded and is provided for equipment protection and safety of personnel Blocking in equipment unprotected by relief valves, unofficially increasing the relief valve set pressure, and blocking ... and welding properties required Most of the equipment used in a plant is made of this versatile material The steel used for equipment is low in carbon (0.3% or less), sulfur, and phosphorus and...
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Process technology equipment and systems chapter 5 & 6
Ngày tải lên :
19/08/2013, 10:47
... have a flexible pressure range and overall capacity, low power cost, and high efficiency rating They can handle density and gas composition changes, and small volumes and can deliver high pressures ... Membranes are designed to be durable and tough and able to withstand high temperatures and a variety of conditions Diaphragm compressors can generate very high pressures and are used to compress hydrogen, ... valves and pressure relief valves are used to relieve excess pressure that could damage operating equipment and hurt operating personnel These valves are sized to handle specific flow rates and...
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Process technology equipment and systems chapter 7 & 8
Ngày tải lên :
20/08/2013, 10:39
... hold the baffles in place and prevent vibration and excessive tube movement Nozzles and Accessory Parts Shell -and- tube inlet and outlet nozzles are sized for pressure drop and velocity considerations ... shell and tube, reboiler, plate and frame, air cooled, and spiral The shell -and- tube heat exchanger is the most common in the process industry Shell -and- tube heat exchangers are designed to handle ... between them and how each applies to heat exchangers Which is (are) the most critical and why? Draw and label a hairpin heat exchanger Draw and label a shell -and- tube heat exchanger Draw and label...
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Process technology equipment and systems chapter 9, 10 & 11
Ngày tải lên :
21/08/2013, 10:47
... water and steam flow rates and temperatures and water level in the boiler The operator also checks for smoke and checks burner and flame pattern The operator maintains good housekeeping and unit ... the trap and comes into contact with the bellows Condensate causes the bellows to contract and open Steam causes the bellows to expand and close Bellows traps can handle condensate and noncondensable ... Furnaces Broken Supports and Guides Broken supports and guides tend to fall to the furnace floor and result in sagging or bowing tubes The falling supports and guides can also hit and damage a burner...
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Process technology equipment and systems chapter 12&13
Ngày tải lên :
23/08/2013, 14:30
... technicians and instrument and electrical, mechanical, safety, and engineering personnel In order to read a P&ID, the technician needs an understanding of the equipment, instrumentation, and technology ... RX-106 equipment, developing checklists, catching samples, and performing startups and shutdowns Electrical Drawing Electrical drawings (Figure 12.7) include symbols and diagrams that depict an electrical ... Diagrams unit and to all electrical equipment These diagrams show the different voltage levels in the unit, electrical equipment such as transformers, circuit breakers, fuses, and motors and horsepower...
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Process technology equipment and systems chapter 14&15
Ngày tải lên :
23/08/2013, 14:47
... excessive pressure drops, and impurities in the feed or product streams The type and quantity of instrumentation are usually determined by past data and experience and from research and development Reactor ... many existing industries and created new ones The steel and metal fabrication and manufacturing, glass, machining, rubber, petroleum, concrete and stone industries, and many others had to develop ... relief valves and alarms, high-temperature alarms and emergency cooling, fire control systems, and toxic chemical detection systems are available for most hazardous conditions and should be installed...
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Process technology equipment and systems chapter 16&17
Ngày tải lên :
27/08/2013, 07:28
... inexpensive and readily available, and it should not be hazardous or corrosive Equipment Basically, the equipment for commercial operations is designed to ensure contact between the solvent and the ... adhesives; hard and soft plastic; plastic fibers and fabric; and resistant, decorative, and transparent plastic Various methods are used in this process In extrusion, solid resins are melted and pushed ... adhesives; hard and soft plastic; plastic fibers and fabric; and resistant, decorative, and transparent plastic Various methods are used in this process In extrusion, solid resins are melted and pushed...
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CO2e emissions from HVAC equipment and lifetime operation for common U.S. building types
Ngày tải lên :
05/09/2013, 15:28
... operational and M&P, from commercial buildings’ HVAC equipment in different geographical locations and climate regions; and, for various building types and fuel sources Methodology and approach ... along with the “Machinery and Engines” and “Air conditioning, Refrigeration, and Warm Air Heating Equipment for the appropriate industry and sector categories Results and discussion The following ... people (1291) and related ventilation and, to a lesser amount, the load from internal equipment and lights For example, the hospital average lighting and plug loads were 12.68 W/m2 and 23.18 W/m2,...
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Sockets and Services from a Security Point of View
Ngày tải lên :
29/09/2013, 13:20
... systems Windows−Specific Services: • NetBIOS (137, 138, and 139 TCP) • RPC Locator (Windows) (135) • Terminal Services (3389 TCP) Standard Unix Services: • Chargen (19 UDP and TCP) • Daytime (13 ... decrypt the random number If the decrypted random number matches the original random number, then the client has proven that it knows the hash and the server can trust it On the wire, only a random ... that service as well One Key Fits All For convenience's sake, some services use the operating system username and password instead of recording a separate username and password pair for the service...
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Voice over IP Applications and Services
Ngày tải lên :
30/09/2013, 05:20
... discusses a service that enables service providers to handle pre-paid and debit calling cards With this new service, service providers can utilize their existing VoIP network, gateways, and gatekeepers ... open-standard, H.323 protocols Provided an integration path that utilized B.A.N.C.'s existing data network and PBX equipment Required neither extensive reconfiguration of existing data and voice equipment, ... initially reduce expenses and eventually offer new internal and external services that provide greater flexibility to both its employees and customers The Background and Setup of B.A.N.C B.A.N.C...
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Utilities and services
Ngày tải lên :
02/11/2013, 10:20
... (27) Northern Ireland / Scotland, and the last Monday of August is a public holiday in England, Wales and Northern Ireland / Scotland 59 A year in the UK: Traditions, holidays and other occasions ... Easter (10) Sunday / Monday, is a public holiday in England, Wales and (11) Scotland / Northern Ireland, but not in (12) Scotland / Northern Ireland April 21st: This is the Queen's (13) birthday / ... decorations Easter England English Epiphany forward haggis Ireland Irish leap Lent Mardi Gras Mothering Mothers' mothers New Year's Pancake resolutions Robert Burns Scotland Shrove Tuesday Saint...
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ENSURING WIRELESS AVAILABILITY AND SERVICE QUALITY WITH DUAL DATA CENTERS
Ngày tải lên :
04/11/2013, 13:15
... Installation Services Commissioning and Integration Provisioning Decommissioning and Removals MAINTENANCE SERVICES • • • • • • • • • Program and Project Management Service Call Center and Dispatch ... • Network and Inventory Audit • Engineering DEPLOYMENT SERVICES • • • • • • • • • Program and Project Management Engineering Material Services Preconfigured Equipment Solutions Power Services ... multitechnology, multiservice solutions makes ADC the ideal choice for projects that require an in-depth, hands-on understanding of simple to complex network environments PLANNING SERVICES • Program and Project...
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Introduction to RF Equipment and System Design
Ngày tải lên :
05/11/2013, 12:15
... task to be handled by a specific RF design and subsequently try to figure out what kind of equipment is needed and how it should be organized My emphasis is on processes and phenomena, and I often ... include amplifier [11] and oscillator [12] design principles, power supplies and voltage regulation [13], and different diode detectors Some understanding of elementary logic design and microwave materials ... Eskelinen, Pekka Introduction to RF equipment and system design.—(Artech House radar library) Radio Equipment and supplies Wireless communications systems—Design and construction Radio frequency...
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