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1. Name the three parts of a programmable logic controller (PLC) and explain why the PLC is preferred by designers over electromechanical relays.
2. Medium-voltage circuit breakers operating on system voltages between 600 volts and 15 kilovolts generally contain blow-out coils and a puffer. Describe a puffer.What is its funtion?
3. How is an electrical distribution system protected from lightning strikes? Name and describe the device used and describe its electrical connection to the distribution system it protects.
4. The first step in preparing a primary distribution cable for connection to a transformer, tap box, or other terminal equipment is to remove the semiconducting jacket. The next step is to crimp a flat lug onto the cable connector. List in any order any three of the next six steps in making the connection.
Assembly Languages ( Second Generation Language) To overcome the difficulty of machine language assembly language was designed. After facing the difficulty of machine
Q. The energy stored in a 2-µH inductor is given by w L (t) = 9e -2t µJ for t ≥ 0. Find the inductor current and voltage at t = 1 s.
RE should be made large enough to swamp out rB/ B. how does making RE large saturate the transistor b
Personal safety Power supplies can be very dangerous. This is specifically true of high voltage circuits, but anything over 12 V must be treated as lethal potentially. A po
power factor use
Bi Directional Buffer 74LS245 This types of bi directional buffer is required for data bus as it has to function as bi directional bus. The logic diagram of such buffer i
when i/p voltg is grater than battery diode is clse or open
Speed Control of Three Phase Induction Motors Three phase induction motors are invariably used in the application where in speed in required to be constant or adjustabl
Figure shows an isolated three-phase load supplied from a 33 kV/11 kV substation via a 30 km long three-phase 11 kV overhead line. The overhead line has the following series parame
Q. Illustrate AC Power Systems? Electric power is indispensable for any modern society. Our use and demand for electric power grows annually at the rate of 2 to 3%; our need ne
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