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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.
A 6 V / 2.5 mA relay is connected in the output stage of a transistor. The coil is made of aluminium having α = 0.004. The resistance of the coil is 600 ? at 32 o C. Calculate th
A conductor 300 mm long moves at a uniform speed of 4 m/s at right-angles to a uniform magnetic field of flux density 1.25 T. Verify the current flowing in the conductor when (
aliasing with message spectrum and two frequency shifted replica and remedies to combat aliasing
(a) The key elements of a protocol are the syntax, semantics and timing. Give a brief explanation of each of these key elements. (b) A file contains 4 million bytes. Compare
is electrical power more important in the world than other streams?
scientific method in operations research
Can we use ohm''s law for AC CIRCUITS?
The Three-phase alternator In this case, three separate sets of coils are wound on the stator and connected to produce three separate outputs. Because of the physical displace
A voltage signal generated by a sensor conditioning circuit varies from -0.5V to +0.5V . The signal from the sensor is to be connected to the analog to digital converter which onl
Q. Some element voltages and currents are given in the network con?guration of Figure. Determine the remaining voltages and currents. Also calculate the power delivered to each ele
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