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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.
Q. Explain the theory of thermal runaway? The maximum average power Pdmax which a transistor can dissipate depends upon the transistor construction and may lie in the
What are Shift Registers - Sequential Logic Circuit? The Shift registers are a type of sequential logic circuit that mainly for storage of digital data and they are a group of
A 2300-V, three-phase, wye-connected, round rotor synchronousmotor has a synchronous reactance of 3 per phase and an armature resistance of 0.25 per phase. The motor operates on
how the interrupts are affected by system rest
Draw the memory map of TPA in a personal computer and explain different areas. The transient program area holds the DOS operating system and other programs which control the co
Task 1 Use basic circuit theory to convert the "T" circuit below into the equivalent "π". Hint: Remember to disconnect the voltage source and the load. Task 2
Q. Determine the Fourier series for the periodic wave - forms given in Figure.
Q. A wire with n = 10 30 electrons/m 3 has an area of cross section A = 1mm 2 and carries a current i = 50 mA. Compute the number of electrons that pass a given point in 1 s, an
Inverters Inverter is a device which converts dc power into ac power at desired output voltage and frequency. Inverters are used in uninterruptible power supply hvdc tra
By a simple time multiplexing of natural samples over a single line, a large radar site transmits 85 analog signals, each with 200-Hz bandwidth. If the sampling is done at twice th
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