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Dc machines 2
Dc machines 2Siva Krishnakanth Reddy
油
There are four methods for supplying DC current to motor/generator poles: separately excitation, shunt connection, series connection, and compound connection. The document then discusses torque-power conversion in DC machines and the total losses in a DC machine, including copper losses from currents in the windings and iron/core losses from hysteresis and eddy currents in the armature. Hysteresis loss occurs due to the magnetic field reversals experienced by the armature core as it rotates between poles, requiring power to continuously reverse the magnetization of the iron molecules.Ozone depletion
Ozone depletionSiva Krishnakanth Reddy
油
The document discusses the history of ozone depletion, including the discovery of the ozone layer's protective function and the role of CFCs in damaging it. It describes how scientists in the 1970s hypothesized that CFCs could deplete stratospheric ozone, leading some countries to ban non-essential CFC uses in the late 1970s. The 1987 Montreal Protocol established an international agreement to phase out CFCs, though challenges remain regarding other ozone-depleting substances like methyl bromide. Coordinated global action and the development of alternatives have slowed ozone depletion, but full recovery is not expected until around 2050.Lunar solar power system
Lunar solar power systemMike S Robinson Solar
油
The document discusses two concepts for delivering solar power from space, focusing on lunar solar power. It outlines the technical aspects of a lunar solar power system, which includes a solar collector, microwave converter, antenna, and receiver on Earth. The environmental advantages of this system include zero greenhouse gas emissions and the potential for enhanced planetary protection.Nuclear Power Plant
Nuclear Power PlantManisha Gurung
油
Manisha Gurung of Bengal College of Engineering and Technology for Women gave a presentation on nuclear power stations on September 2, 2014. She discussed how nuclear power stations use nuclear fission to generate electricity, provided examples of early nuclear power plants and current major plants in India. She also covered nuclear reactor types, the nuclear fission process, advantages and disadvantages of nuclear energy, and future reactor technologies.International Space Station
International Space Station Achuthan Karnnan
油
The International Space Station (ISS) is a large spacecraft in low Earth orbit that serves as a microgravity laboratory. It was built through an international collaborative project involving space agencies from the United States, Russia, Japan, Canada, and Europe. Key components of the ISS include pressurized modules that house crew members, laboratories, and living quarters, as well as structural elements like integrated truss segments that provide power and structural support. Life support systems on the ISS recover water and oxygen to sustain the crew members living and working aboard the orbiting laboratory.Final presentation on antimatter
Final presentation on antimatterArpit Saxena
油
Antimatter is composed of antiparticles that have the same mass but opposite charge as normal matter particles. For example, a positron is the antiparticle of the electron. When antimatter comes into contact with normal matter, they annihilate each other and release a large amount of energy. While antimatter holds promise for medical imaging technologies like PET scans, it remains extremely difficult and costly to produce and contain due to the high energies and precision required.Lunar solar power system
Lunar solar power systemBiswajit Pratihari
油
The document proposes a Lunar Solar Power (LSP) system to collect solar power on the moon and transmit it to Earth via microwave beams. The system would consist of solar collectors on the moon's surface that convert sunlight to electricity and then microwave beams. These beams would be transmitted to rectennas on Earth which would convert the microwaves back to electricity for use. The LSP system could provide over 10 terawatts of clean, safe, and reliable solar power to Earth within 15 years as an alternative to current energy sources.Power Station for Space Settlements
Power Station for Space SettlementsArchit Devarajan
油
The document presents a concept for an antimatter-based power station designed for space settlements as part of a NASA competition. It explores the potential of antimatter as a high-density energy source, compares it to conventional power generation methods, and details the design and components of the proposed station. The author concludes with optimism about the future of antimatter technology in energy production.Dc machines 1
Dc machines 1Siva Krishnakanth Reddy
油
The document discusses DC machines which can operate as either motors or generators depending on the direction of power flow. A DC machine consists of a static electromagnetic or permanent magnetic field and a rotating armature. The field produces a magnetic medium and the armature produces voltage and torque under the action of the magnetic field. An advantage of DC motors is their speed is easy to control over a wide range, while DC generators are now quite rare. Most DC machines have AC voltages and currents internally but produce DC outputs via a commutator mechanism.Dc machines 3
Dc machines 3Siva Krishnakanth Reddy
油
Eddy currents are induced in the armature core of a DC machine, in addition to currents in the armature conductors. These eddy currents circulate in the core and cause eddy current losses, which appear as heat and reduce the machine's efficiency. Eddy current loss depends on the square of the lamination thickness, so the thickness should be kept small. Other losses in a DC machine include iron losses, mechanical losses like friction, and variable losses that change with load. Diagrams can be used to represent the flow of power inputs and losses in a DC machine.Nuclear energy4
Nuclear energy4Siva Krishnakanth Reddy
油
This document discusses the need for a unified energy strategy and provides an overview of nuclear energy and non-conventional energy sources. It notes that population and energy usage are increasing globally while electrical usage is rising faster. It also discusses how nuclear energy produces vastly more energy than fossil fuels from the same amount of mass and explains the basic concepts and history of nuclear fission, fusion, and chain reactions.Diamonds
DiamondsSiva Krishnakanth Reddy
油
Diamonds have been treasured for centuries due to their rarity, durability, and beauty. Their sparkle comes from facets that reflect light internally and externally. Diamonds are graded on the 4 Cs - color, clarity, cut, and carat weight. Higher grades mean fewer inclusions, closer to colorless color, ideal cutting proportions, and larger size. Proper cleaning maintains a diamond's brilliance. Synthetic diamonds and simulants like cubic zirconia are available but have distinguishing characteristics. Understanding these basics empowers consumers.Antimatter
AntimatterSiva Krishnakanth Reddy
油
1) Antimatter is composed of antiparticles that annihilate with normal matter, releasing a burst of energy.
2) In 1928, Dirac developed his equation which predicted antimatter in the form of positrons. The existence of positrons was confirmed experimentally in 1932.
3) Today it is known that every particle has an antiparticle. When matter and antimatter annihilate, their mass is converted to energy at a rate of 9x1016 J/kg, giving antimatter the highest energy density of all known substances.Teamwork
TeamworkSiva Krishnakanth Reddy
油
The document retells the classic fable of the Tortoise and the Hare through multiple races that teach valuable lessons. In the first race, the overconfident Hare loses to the slow but steady Tortoise. They race again, with the Hare winning by maintaining a fast pace. In the third race, the Tortoise changes the conditions to suit his strength of swimming. They later race as a team, combining their strengths. The moral is that teamwork allows individuals to play to their strengths, and competing against a situation rather than a rival leads to better performance.More Related Content
More from Siva Krishnakanth Reddy (7)
Dc machines 1
Dc machines 1Siva Krishnakanth Reddy
油
The document discusses DC machines which can operate as either motors or generators depending on the direction of power flow. A DC machine consists of a static electromagnetic or permanent magnetic field and a rotating armature. The field produces a magnetic medium and the armature produces voltage and torque under the action of the magnetic field. An advantage of DC motors is their speed is easy to control over a wide range, while DC generators are now quite rare. Most DC machines have AC voltages and currents internally but produce DC outputs via a commutator mechanism.Dc machines 3
Dc machines 3Siva Krishnakanth Reddy
油
Eddy currents are induced in the armature core of a DC machine, in addition to currents in the armature conductors. These eddy currents circulate in the core and cause eddy current losses, which appear as heat and reduce the machine's efficiency. Eddy current loss depends on the square of the lamination thickness, so the thickness should be kept small. Other losses in a DC machine include iron losses, mechanical losses like friction, and variable losses that change with load. Diagrams can be used to represent the flow of power inputs and losses in a DC machine.Nuclear energy4
Nuclear energy4Siva Krishnakanth Reddy
油
This document discusses the need for a unified energy strategy and provides an overview of nuclear energy and non-conventional energy sources. It notes that population and energy usage are increasing globally while electrical usage is rising faster. It also discusses how nuclear energy produces vastly more energy than fossil fuels from the same amount of mass and explains the basic concepts and history of nuclear fission, fusion, and chain reactions.Diamonds
DiamondsSiva Krishnakanth Reddy
油
Diamonds have been treasured for centuries due to their rarity, durability, and beauty. Their sparkle comes from facets that reflect light internally and externally. Diamonds are graded on the 4 Cs - color, clarity, cut, and carat weight. Higher grades mean fewer inclusions, closer to colorless color, ideal cutting proportions, and larger size. Proper cleaning maintains a diamond's brilliance. Synthetic diamonds and simulants like cubic zirconia are available but have distinguishing characteristics. Understanding these basics empowers consumers.Antimatter
AntimatterSiva Krishnakanth Reddy
油
1) Antimatter is composed of antiparticles that annihilate with normal matter, releasing a burst of energy.
2) In 1928, Dirac developed his equation which predicted antimatter in the form of positrons. The existence of positrons was confirmed experimentally in 1932.
3) Today it is known that every particle has an antiparticle. When matter and antimatter annihilate, their mass is converted to energy at a rate of 9x1016 J/kg, giving antimatter the highest energy density of all known substances.Teamwork
TeamworkSiva Krishnakanth Reddy
油
The document retells the classic fable of the Tortoise and the Hare through multiple races that teach valuable lessons. In the first race, the overconfident Hare loses to the slow but steady Tortoise. They race again, with the Hare winning by maintaining a fast pace. In the third race, the Tortoise changes the conditions to suit his strength of swimming. They later race as a team, combining their strengths. The moral is that teamwork allows individuals to play to their strengths, and competing against a situation rather than a rival leads to better performance.Dc 2
- 2. ROTOR OF A DC MOTOR
- 4. OPERATION OF DC MACHINE AS A MOTOR OPERATION OF DC MACHINE AS A MOTOR
- 5. 900 900 900 MIDDLE FINGER= CURRENT THUM B = M OTION FLEMINGS LEFT HAND RULE OR MOTOR RULE