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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.
proof of Norton theorem
Find the minimum rate of sampling that must be used to convert the message into digital form: (a) If an audio message has a spectral extent of 3 kHz. (b) If a television sign
Schottky diodes The schottky diodes have very fast recovery time and low forward drop. The current ratings of these diodes vary from 1A to 300 a and maximum allowable
a 400V 4-pole DC generator takes an armature current of 50A when rotating at 626 rpm. the armature circuit resistance is 0,25ohms. determine the generated emf. DOC
Define intermodal dispersion? Dispersion of the transmitted optical signal causes distortion for both digital and analog transmitted signal. The dispersion causes broadening o
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What are hard magnetic materials? Hard Magnetic materials- They have a slowly rising magnetization curve along with large hysteresis loop area and therefore large energy losses
Q. What do you mean by Inaccessible area coverage? Marshy lands, hilly areas, etc where ground surveys could be very difficult, remote sensing technique can provide reliable an
Explain temperature dependence of electrical resistivity and conductivity in semiconductors. The electrical conductivity of the semiconductors changes considerably with temper
1. In ordinary photography, each part contains information of the original object separately and in case some part of the object is destroyed then the information of that par
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