Aircraft Electrical Power Generation and Distribution Coursework

Aircraft Electrical Power Generation and Distribution - Coursework Example This magnetism in turn induces voltage into an armature which then carries electrical power to generator control unit (GCU). This power is rectified and conducted to exciter field winding. This then induces voltage into exciter output winding field. This output is rectified to DC and flows through the output field winding and it’s induced into the main output coils. A voltage regulator is incorporated to control the voltage generated by the system depending on the load and the engine speed. It consists of a Generator Control Unit that ensures that all the 3 phases produce equal voltages or the difference is within limits. It also has provision to ensure that the frequency is maintained within the desired limits. Over voltage (OV) - When the voltage at the point of reference (POR). Is above 125V, there is a faculty voltage regulator, and the generator control relay (GCR) is de-energized. Q2. Explain with an aid of a diagram how an integrated drive generator (IDE) works. The IDE has 2 main parts. i. A drive. ii. A brushless AC generator. The drive part makes sure that the generator operates at a fixed rpm, regardless of the engine rpm and generator load. The IDG input shaft drives the generator through a reduction gearing and a differential gear. When the generator operates at 12000 rpm the generator frequency is 400 Hz. When the input shaft increases or decreases the frequency of the generator increases or decreases too. This deviation from 400 Hz is detected in the GCU which supplies an electrical signal to a servo valve in the IDG drive part. This servo valve in turn controls through a control cylinder a hydraulic unit which starts to operate in an anti/clockwise direction. Since the hydraulic unit is connected to another input of the differential gear, the generator rpm increase or decrease is less than the rpm fluctuation on the input shaft. As a result, the generator frequency stays approximately constant. The hydraulic unit operates on 240 up to 280 psi. This charge pressure is made by a charge pump and charge relief valve; the charge oil is also used to cool the generator. The oil flow is between 34 and 53 liters. Drain oil from the generator and sump is supplied through a scavenge filter to an external oil cooler by three pumps , which are driven by the accessory drive gear on the differential gear These pumps are generator scavenge pump, sump scavenge and inversion scavenge pump. The accessory drive gear also drives the de-aerator and charge pump. The return oil from the cooler passes the de-aerator and it goes back to the charge pump. Q3. Explain how a transformer rectifier (TRU) works. The TRU as the name suggests is both a transformer and a rectifier. The transformer steps down 12000 V to 28 V while the rectifier converts the 400Hz AC power to DC. The 3 phase AC is routed to the primary side of the transformer and is in connected in star order. Two secondary sides are at the transformer. SEC 1 is in star order while SEC 2 is in delta order. The output of the secondary side is rectified by full wave rectifier circuits. The purpose of the two different secondary sides with separate rectification is to have less ripple of the rectified 28V DC power output. If the temperature of the rectifiers is over a certain limit, overheat switches providing signals to the monitor circuit in the TRU causes the TRU

Patterns in Global Communication Essay Example | Topics and Well Written Essays - 250 words

Patterns in Global Communication - Essay Example The program was initially meant to monitor the Soviet Union. However, the system is now used to counter terror attacks (Kamalipour pg. 328). Future world wars will take place with the use of the internet. The internet allows malicious people to send viruses through emails that might affect the files of a company. Cyber terrorists can also use the internet to spread propaganda. Cyber-attacks are also expected to increase in the near future. I think that the digital age and the â€Å"pop culture† is a threat to some cultures and traditions. Developing countries that have struggled to keep their cultural practices alive are facing major challenges conserving their cultures. This is due to the effect technology like video games; computer software’s and western television programming are having on their society. This is slowly eroding their cultural beliefs and practices (Kamalipour pg. 331). The topic about the effect that technology is having on cultures of people in the developing countries interested me a lot. This is due to the fact that these countries have struggled to preserve their cultures for decades and it’s all going away due to the effect of

Feasibility Analysis of Book Exchange Website Essay

Feasibility Analysis of Book Exchange Website - Essay Example This intended project is about the development of an online website system which will be useful for students. This web based system will be an online book exchange website. This website will offer the opportunity to students to obtain free books online trough exchanging them to others at the same website. This feasibility report is aimed to offer a detailed overview of the system development for facilitating the people for obtaining books online by exchanging them to others. The development of the online business website system offers an opportunity to become a part of global ecommerce community. The development of an online website for exchanging books and offering them to student at no cost needs elaboration of the main revenue source of the business. In the intended website it is expected to implement an effective ecommerce revenue model. We have researched and found that for such type of the website the web based promotion or pay-per-click revenue model will be appropriate. The main aim of this business website is to develop and implement a system that offers the business a better opportunity and facilitate the people to access free books and exchanging your books to others. The next main financial aim of this project is to generate revenue for business through establishment of an effective revenue model on the web. The proposed website is for the exchanging costly and less available books to the other students/people on the web. The main aim of the this website is to offer a better and greater opportunity regarding the establishment of a common and innovative platform for exchanging huge collation of books to overall students and book lovers community. This website will be an innovative project of its nature that is aimed to offer the people to obtain book of any cost. However this website also produces a feeling of goodness to other

Degeneration of Free Enterprise Systems Essay Example | Topics and Well Written Essays - 1000 words

Degeneration of Free Enterprise Systems - Essay Example Free enterprise systems trace their roots way back in the 18th century when governments restricted individuals from owning and starting their own businesses. In a free enterprise system, the control of goods and services is through demand and supply, as well as competition. There are laws in place that encourage free market competition and avoidance of monopolies. A free enterprise system is self-regulating, where all parties are free to transact with each other. The only government intervention carried out is punishment on frauds. Competition within a free enterprise ensures production of excellent goods. In a free enterprise system, individuals enjoy the freedom of owning private property. Businesses and individuals are free to engage in contracts (Elijah 41). Therefore, the agreement to sell or buy goods, whether oral or written, is legally binding. On the other hand, individuals enjoy the freedom to make personal choices. They communicate those choices throughout the pricing syst em. In addition, people are free to participate in free competition and enterprise (Elijah 42). They do this by choosing a place they will work and manage their own business. If they desire so, they are free to choose the type and amount of services and goods they are willing to produce. According to Adam Smith, self interest acts as a force that dictates the behaviors of businesses and individuals. Therefore, people are free to search for their own self-interest. Fascism is a form of authoritarian and nationalistic government organization (Leon 5). In a fascist system, the government may not own businesses but does control them. The government controls what is produced, who is to produce it, when to produce it, what prices to charge, where to find raw materials and labor. Labor becomes largely suppressed under fascist forms of governments. The government makes the owners of business to believe they still own their business, yet they control them through regulations and taxations. F ascist governments are defined as governments that control large corporations. Fascism advocates for war and political violence as means of achieving nationalism (Leon 5). A fascist state is controlled by a leader who becomes viewed supreme and practices dictatorship on the government and other government enterprises. It is also defined as a government form characterized by authority centralization under a dictator. Fascism is a government system where all forms of business enterprises become regimented under a dictator who emphasizes on the need for nationalism. Fascism may also be coupled with racism. An oligarchy is a form of government where a limited number of people control power. Normally, such people may be in control of a country’s government, they can also be wealthy individuals. Degeneration of a Free Enterprise system Degeneration of free enterprise happens when there is a decline of effectiveness of power, essential quality or power itself. Degeneration of a free enterprise system if not controlled can lead to systems associated with fascist oligarchs. A free enterprise may crumble either because of forceful government intervention or market forces. In case a free enterprise system degenerates as a result of market forces then the government may intervene, but if it is through forceful intervention, then the most likely outcome may be a fascist oligarch. Fascism presents the first step of degeneration of a f

RISK MANAGEMENT IN ABN AMRO BANK Essay Example | Topics and Well Written Essays - 1250 words

RISK MANAGEMENT IN ABN AMRO BANK - Essay Example Credit risk on loans is mitigated by reducing loan limits and exposures to companies that are below investment grade (BBB or UCR1 to UCR3-) levels. Limits are imposed on companies operating in industries that have been given an unfavorable economic outlook. In addition to carrying out a stress test on individual portfolios the company has also sought to mitigate credit risk by hedging in the form of credit default swaps (CDS) (ABN AMRO, 2010, p. ). Furthermore, the company carries out an assessment of the value of its collateral portfolio in order to determine how secured its loans are and therefore the extent of their exposure. Credit officers are given the task of monitoring the quality of ABN AMROs loan portfolio on a regular basis (ABN AMRO 2003, p.8). Credit risk is reported in the form of an analysis according to the industry sector in which the loans are made, the type of loans, with an indication of the carrying amount of the loans. An analysis of its credit exposure and thei r currency status is also given (ABN AMRO 2010, p.68-70). According to Bessis (2002, p15-16) and ABN AMRO (2010, p.71) Country risk is the risk that there are crisis related situations in a country. The causes of country risk in ABN AMRO are that funds or goods cannot be transferred from the country as a result of convertibility and transfer restrictions (ABN AMRO 2003, p. 10). ... 10). According to ABN AMRO (2010, p.94-95), interest rate risk is measured by calculating the net interest income (NII); NII-at-Risk; duration of equity; and VaR. The company monitors interest rate risk by noting the development of the NII under different yield curve scenario to determine the NII- at-Risk. Interest rate risk is mitigated by hedging, in the form of interest rate swaps. The company reports interest rate risk by providing a comparative analysis of the percentage NII-at-Risk; duration of equity in terms of years; and VaR banking book between the current and prior year. Currency risk is measured using VaR. It monitored by comparing short and long positions with limits set by the Group Risk Committee (GRC). Currency risk is mitigated with the use of various hedging strategies such as futures. Foreign currency gains and losses are reported in the Income Statement (ABN AMRO 2010, p.95; 2003, p. 14). According to ABN AMRO (2010, p. 83-84), market risk is measured using VaR an d a wide array of stress tests. Risks are controlled by setting limits for each trade desk and by setting counterparty credit exposure limits. ABN AMRO mitigates this risk by diversifying its risks across geographic locations and industries. Market risk is reported using a graph as well as a comparative analysis of the highest, lowest and average VaR of the current and prior year. Liquidity risk is measured using Loan to Debt (LtD) ratio, stable funding over non-liquid assets ratio (SF/NLA) which is an internally developed ratio and survival period (ABN AMRO 2010, p. 87). In order to mitigate liquidity risk ABN AMRO diversifies its currency and geography and maintains a wide investor base (ABN AMRO 2010, p. 87). A

Book of Prophet Isaiah Essay Example for Free

Book of Prophet Isaiah Essay Prophet Isaiah, the son of Amos, was descended from a royal tribe. Isaiah was born during the reign of King Uzziah, Jothan, Ahaz, Hezekiah and Jehovah. During his reign the nation as a whole enjoyed times of prosperity and temporal development. The whole nation mourned his passing from the scene at a time when his presence seemed needed the most. Under him the worship of Jehovah was encouraged but he was not strong enough to secure the destruction of the high places where idolatrous practices were continued. His reign must be ranked as one of the outstanding of the southern kingdom. He walked in the ways of his father, and under him the people continued to worship the Lord Jehovah after the manner of the commandment, though still the places of idolatry were allowed to remain. Ahaz, whose whole reign was one chronicle of disaster and destruction. With an absolute abandon, Ahaz gave himself over to the overthrow of the ordained order of worship, broke the commandment in almost every detail, destroyed the temple worship and finally closed the doors of the house of God. In the most calculated manner he conspired to obliterate the memory of the service of the Lord of all Israel, the Redeemer and the Holy One. Then he was followed on the throne by his son Hezekiah, who was very unlike his fathers and set about reviving the worship in the temple, which his father had abolished. He attempted, with some success to obliterate idol worship, and to deliver his people from the yoke of foreign power. It was under him that Isaiah came into his own, and was treated with high favour. In this position he was given every opportunity for the use of his keen and divinely inspired power of discernment into the facts of the contemporary situation. The name, Isaiah, means Jehovah saves, or Jehovah is salvation, and through days of crisis and disaster greater than any before in the history of the people, his call was constantly to faith in the One Who alone could save the land. His role was ever that of inspiring and challenging the drooping spirits of the men of Judah at times when hope seemed dead. His ministry was a long one stretching as it did through the reigns of Uzziah, Jothan, Ahaz and Hezekiah. His fathers name was Amoz, and there is a Jewish tradition that he was a brother of King Amaziah; in which case Isaiah would be the cousin of King Uzziah. Naturally enough, it is impossible to be really sure of this, but it is certainly a reasonable explanation of the fact that Isaiah enjoyed immediate and regular entrance to the royal house. And also that he had the ear of the most influential people of his day. In spite of this, he remained a simple and undaunted spokesman for Jehovah, and tradition again affirms that it was for this reason that he was put to death in the reign of the wicked Manasseh, Hezekiahs successor. He was married and he himself called his wife the prophetess (Isaiah 8:3). He had two children, one named Shear-jashubl, which means a remnant shall return, and the other Maher-shalalhashbaz, which means haste ye to the spoil. These names were given to them as portents of what was to come and also as a reinforcement of the prophets predictive message. Apart from this, there is little else known of his personal history except what is found in the book itself. The exact length of his ministry is not known for sure, but he definitely laboured for at least forty years. From the last year of King Uzziahs reign 740 B.C. to the fourteenth year of ther reign of King Hezekiah in 701 B.C. and it is clear that through all this period of time his call and challenge were unremitting and persistent. His aim was ever definite the establishment of the worship of the Lord in righteousness and truth amongst the chosen race. His Message Isaiahs prophecy, the longest of all the Old Testament prophecies divides first of all quite naturally into two parts, chapters 1-39, and 40-66. Because of this split, critics during the last century have seen fit to decide that two separate authors are responsible for the prophecy and that the second one was written some hundred years after the first one. Unfortunately, there is nothing in the prophecy itself by the way of names and such like to establish the truth or the falsehood of this statement. However the nature of the second part of the book seems to indicate that it was said to a nation at a time when they were in a completely different condition from that of the exile in Babylon, during which time some people maintain that it was written. As well as these two separate parts, the prophecy also divides into nine sections. The Book of Isaiah (Hebrew: × ¡Ã— ¤Ã— ¨ ×™× ©Ã— ¢Ã—™×”) is the first of the Latter Prophets in the Hebrew Bible, preceding Ezekiel, Jeremiah and the Book of the Twelve. (The order of the subsequent books differs somewhat in the Christian Old Testament). The first 39 chapters prophesy doom for a sinful Judah and for all the nations of the world that oppose God, while the last 27 prophesy the restoration of the nation of Israel and a new creation in Gods glorious future kingdom;[1] this section includes the Songs of the Suffering Servant, four separate passages referring to the nation of Israel, interpreted by Christians as prefiguring the coming of Jesus Christ.

Calorimeters Essay Example for Free

Calorimeters Essay The Calorimeters Calorimeters are a device that can measure the heat that comes from burning an item. Simple Calorimeter A simple calorimeter is used to detect the enthalpy change when a fuel is burned. The fuel is burnt to heat a specific mass of water and then measure its rise in temperature. The word calorimeter comes from the Latin phrase calor which means heat. A simple calorimeter just consists of a thermometer attached to a metal container full of water suspended above a combustion chamber. Below is a diagram of a simple calorimeter. The temperature of the water allows for calculating calorie content of the fuel. Pressurized with pure oxygen and containing a known mass of a sample and a small amount of water, it is submerged under a known volume of water before the charge is electrically ignited. The bomb, with the sample and oxygen, form a closed system, no air escapes during the reaction. The energy released by the combustion raises the temperature of the steel bomb, its contents, and the surrounding water jacket. The temperature change in the water is then accurately measured. This temperature rise, along with a bomb factor (which is dependent on the heat capacity of the metal bomb parts) is used to calculate the energy given out by the sample burn. A small correction is made to account for the electrical energy input, the burning fuse, and acid production (by titration of the residual liquid). After the temperature rise has been measured, the excess pressure in the bomb is released. Basically, a bomb calorimeter consists of a small cup to contain the sample, oxygen, a stainless steel bomb, water, a stirrer, a thermometer and ignition circuit connected to the bomb. Below is a diagram of a bomb calorimeter.