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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.
show a schematic diagram of michelson interferometer
Question 1 (a) Describe the functions of the modulator and source encoder in a digital communications system. (b) By using appropriate examples, distinguish between th
a. Explain the time division space switching b. Verify the execution complexity of 2048 channel TST switch with 16 TDM links and 128 channels. Let the time slot of space switch
Explain mechanisms of propagation of radio communication. Radio communication deals with electronic radiation of electromagnetic energy from one point to another through atmosp
Draw a relay construction diagram and briefly explain the operation of a relay. Define the terms normally open and normally closed. Define the terms Set and Reset for relays.
A three-phase, wye-connected, 400-V, four-pole, 60-Hz induction motor has primary leakage mpedance of 1 + j2 and secondary leakage mpedance referred to the primary at standstill
What is XMS? XMS: The memory system is splits in three major parts as: system area, XMS (extended memory system) and TPA (transient program area). The kind of microprocessor in
Why are waveguides not used at low frequencies?
Q. Explain Modulation and sampling? Modulation is the process whereby the amplitude (or another characteristic) of a wave is varied as a function of the instantaneous value of
Technical Loss in Electrical Systems Technical loss is inherent in electrical systems, as all electrical devices have a few resistances and the flow of currents causes a power
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