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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.
Give some applications of German silver. German silver is an alloy of zinc, nickel and copper. German silver is used in electrical measuring instruments.
Representation of Negative Number: As mentioned in chapter 1 in 8085 negative numbers are represented in 2 complement form and subtraction is performed using 2 comple
Q. Three waveforms seen on an oscilloscope are shown in Figure. If the horizontal scale is set to 50 ms per division (500 ms for the entire screen width), and the vertical scale is
Auxiliary Carry Fla - Registers If carry is generated from D 3 to D 4 in the accumulator after any arithmetical or logical operations. Auxiliary carry flag (AC) is set
whatis motor protection
Bipolar Junction Transistor: Transistor construction: the emitter layer is heavily doped, the base is light doped and the collector is only lightly doped. Outer layer has wi
Multiprogramming - Single Processor one Users Many Programs When single processor is used to execute more than one independent program simultaneously the technique is ca
Q. A 60-Hz, six-pole, wye-connected, three-phase induction motor, with the parameters R 1 = R 2 = 0.025 and Xl 1 = Xl 2 = 0.125 , is controlled by variable-frequency control
Turn off Time The time interval between the instant when the SCR current has decreased to zero after external switching of the SCR voltage circuit and the inst
List the various addressing modes present in 8086? There are 12 addressing modes are present in 8086. They are, (a) Register and immediate addressing modes _ Register ad
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