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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.
Metering Technologies An electric meter or energy meter is a device in which measures the amount of electrical energy supplied to customers of an electric supply company. Elec
Q. Some element voltages and currents are given in the network configuration of Figure. Determine the remaining voltages and currents. Also calculate the power delivered to each el
Q. Illustrate Power Semiconductor Devices? Since the advent of the first thyristor or silicon-controlled rectifier (SCR) in 1957, tremendous advances have been made in power se
12. A capacitor is to be constructed so that its capacitance is 0.2µF and to take a p.d. of 1.25kV across its terminals. The dielectric is to be mica which, after allowing a safety
What is an interrupt? An interrupt is either a software-generated CALL or hardware-generated CALL.
a) Define the blending function reparanetrization. b) Four position vectors P1[0 , 0], P2[1 ,1], P3[2 ,-1] ,P4[3, 0] are provided with tangent vectors P1'[1,1] and P4'[1,1]. Cal
DCR Decrement Instruction This instruction is used to decrement the contents of any register or memory location by one. There are two formats.
If a television station operates on UHF channel 20 (band 506-512 MHz), determine the station's visual-carrier frequency.
1. Introduction : Theory: Frequency is the number of occurrences of a repeating event per unit time. It can also be defined as the number of repetitions (cycles) of a w
Antenna Fundamentals We shall discuss here only the fundamental concepts needed to understand the role of an antenna as a power-coupling element of a system. Figure illustrates
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