The story is about an eight-year-old girl named Valli who lives in a village. She enjoys watching the bus pass by her village each hour and dreams of traveling on it. She carefully saves money by resisting treats and plans to take the bus during her mother's nap. One day, Valli bravely takes the bus alone, refusing help from others. She enjoys the sights but is frightened when she sees a cow that was alive earlier lying dead. Upon returning home, Valli affirms something her mother says, surprising them with her maturity. Her aunt refers to her as acting grown up but only Valli knows about her secret bus journey.
Centrifugal pumps work by using an impeller to impart centrifugal force on a fluid, increasing its velocity and pressure. The impeller is housed inside a casing and rotates to pick up fluid at its center, throwing it outward where the casing contains and directs it to the discharge pipe. Key parts include the suction eye, impeller, casing, and discharge pipe. Centrifugal pumps are useful for handling fluids with solids and providing high pressure output for various industrial and domestic applications.
The narrator feels lonely and depressed after shifting to a new high school where he has no friends. Things get worse when his house catches fire and he loses all his possessions, including his pet cat. At school the next day wearing borrowed clothes, the other students show kindness by giving him supplies. He makes new friends who help him feel less lonely. Later, a kind lady finds his lost cat and returns it, bringing him happiness again. The story shows how having a positive attitude and friends can help one overcome difficulties in life.
This document describes the components and functioning of a centrifugal governor. It begins by explaining that a governor regulates engine speed under varying loads by controlling the supply of a working fluid. It then describes the key parts of a centrifugal governor, including balls attached to arms that spin with the engine and move the sleeve up or down to open or close a throttle valve based on centrifugal force. The document further explains concepts like equilibrium speed and sleeve lift, and provides examples of different governor designs, including the Watt, Porter, and Hartnell governors. It concludes by discussing characteristics like stability, sensitiveness and isochronism that determine a governor's effectiveness.
Class x madam_rides a bus m1-ppt-convertedFoxinMail
1) The document is a story about an 8-year-old girl named Valliammai who takes her first bus journey alone from her village into town, which is six miles away and takes the bus forty-five minutes each way.
2) Through conversations with neighbors who frequently took the bus, Valliammai learned about the town's distance and bus travel times. She saved 30 paise for the one-way bus fare by resisting candy and toys.
3) On her journey, Valliammai bravely refused help from the conductor or other passengers and behaved like an adult. The conductor jokingly referred to her as the "grown up madam" due to
Pumps can be classified in several ways, including by their method of fluid displacement. The main types are positive displacement pumps, which force fluid through by trapping a fixed volume and displacing it, and centrifugal pumps, which use rotational energy to speed up fluid and push it outward. Positive displacement pumps further include rotary pumps like gear pumps and screw pumps, which use rotating mechanisms like gears or screws to trap fluid and move it through the pump.
1. Valves measure and control fluid pressure and flow in hydraulic circuits. Common valves include relief valves, reducing valves, unloading valves, sequence valves, and counterbalance valves.
2. Relief valves open to discharge fluid and prevent excess pressure when inlet pressure reaches a set point. Reducing valves lower pressure to a controlled outlet value. Sequence valves control the order of actuators based on preset pressure levels. Counterbalance valves maintain pressure on one side of a system until another reaches a threshold.
The story is about an eight-year-old girl named Valli who lives in a village. She enjoys watching the bus pass by her village each hour and dreams of traveling on it. She carefully saves money by resisting treats and plans to take the bus during her mother's nap. One day, Valli bravely takes the bus alone, refusing help from others. She enjoys the sights but is frightened when she sees a cow that was alive earlier lying dead. Upon returning home, Valli affirms something her mother says, surprising them with her maturity. Her aunt refers to her as acting grown up but only Valli knows about her secret bus journey.
Centrifugal pumps work by using an impeller to impart centrifugal force on a fluid, increasing its velocity and pressure. The impeller is housed inside a casing and rotates to pick up fluid at its center, throwing it outward where the casing contains and directs it to the discharge pipe. Key parts include the suction eye, impeller, casing, and discharge pipe. Centrifugal pumps are useful for handling fluids with solids and providing high pressure output for various industrial and domestic applications.
The narrator feels lonely and depressed after shifting to a new high school where he has no friends. Things get worse when his house catches fire and he loses all his possessions, including his pet cat. At school the next day wearing borrowed clothes, the other students show kindness by giving him supplies. He makes new friends who help him feel less lonely. Later, a kind lady finds his lost cat and returns it, bringing him happiness again. The story shows how having a positive attitude and friends can help one overcome difficulties in life.
This document describes the components and functioning of a centrifugal governor. It begins by explaining that a governor regulates engine speed under varying loads by controlling the supply of a working fluid. It then describes the key parts of a centrifugal governor, including balls attached to arms that spin with the engine and move the sleeve up or down to open or close a throttle valve based on centrifugal force. The document further explains concepts like equilibrium speed and sleeve lift, and provides examples of different governor designs, including the Watt, Porter, and Hartnell governors. It concludes by discussing characteristics like stability, sensitiveness and isochronism that determine a governor's effectiveness.
Class x madam_rides a bus m1-ppt-convertedFoxinMail
1) The document is a story about an 8-year-old girl named Valliammai who takes her first bus journey alone from her village into town, which is six miles away and takes the bus forty-five minutes each way.
2) Through conversations with neighbors who frequently took the bus, Valliammai learned about the town's distance and bus travel times. She saved 30 paise for the one-way bus fare by resisting candy and toys.
3) On her journey, Valliammai bravely refused help from the conductor or other passengers and behaved like an adult. The conductor jokingly referred to her as the "grown up madam" due to
Pumps can be classified in several ways, including by their method of fluid displacement. The main types are positive displacement pumps, which force fluid through by trapping a fixed volume and displacing it, and centrifugal pumps, which use rotational energy to speed up fluid and push it outward. Positive displacement pumps further include rotary pumps like gear pumps and screw pumps, which use rotating mechanisms like gears or screws to trap fluid and move it through the pump.
1. Valves measure and control fluid pressure and flow in hydraulic circuits. Common valves include relief valves, reducing valves, unloading valves, sequence valves, and counterbalance valves.
2. Relief valves open to discharge fluid and prevent excess pressure when inlet pressure reaches a set point. Reducing valves lower pressure to a controlled outlet value. Sequence valves control the order of actuators based on preset pressure levels. Counterbalance valves maintain pressure on one side of a system until another reaches a threshold.
INTRODUCTION TO PUMPS, COMPRESSORS, FANS & BLOWERS.pdfBagusSigit3
Centrifugal pumps operate by using a rotating impeller to impart velocity energy to the fluid being pumped. As the fluid passes through the impeller blades, it is accelerated outward and converted to pressure energy upon exiting the pump casing. There are two main categories of pumps - positive displacement pumps which move a fixed volume of fluid per rotation, and centrifugal pumps which increase fluid velocity and pressure through centrifugal action. Centrifugal pumps are commonly used and consist of an impeller, casing, and volute. Pump performance is represented by curves showing head versus flow rate. The operating point occurs where the pump curve intersects the system curve for a given application.
This document provides an overview of radial piston pumps. It defines a radial piston pump as a type of hydraulic pump where the working pistons extend radially from a central drive shaft. The document discusses the construction, working, properties, advantages, and applications of radial piston pumps. It notes that radial piston pumps can produce smooth flow under extreme pressure and are commonly used in machine tools, hydraulic systems, and the automotive industry.
Bent shaft vibration is caused by a bent shaft in a machine. A bent shaft can occur due to manufacturing defects, shipping damage, or uneven wear over time. Key signs of a bent shaft include high 1x axial vibration, a dominant 1x peak in spectral analysis, and 180 degree phase difference in axial vibration measurements across the machine. Identifying these vibration characteristics can indicate the presence of a bent shaft requiring repair or replacement.
Introduction, classification, principle of working and constructional details of vane pumps, gear pumps, radial and axial plunger pumps, screw pumps, power and efficiency calculations, characteristics curves, selection of pumps for hydraulic Power transmission.
The document discusses centrifugal pumps, including their basic principles and operation. It describes the main parts of a centrifugal pump like the impeller, casing, shaft, and bearings. It explains key concepts such as pump head, net positive suction head (NPSH), affinity laws, and pump curves. The document also covers pump operation, including proper start up and shut down procedures, as well as potential problems that can occur.
A governor is a device that regulates the speed of an engine by controlling the fuel supply. There are two main types - centrifugal and inertia governors. Centrifugal governors use rotating masses (flyballs) where the centrifugal force is balanced by a controlling force like tension in the arms. As speed increases, the flyballs rise and the controlling mechanism reduces the fuel supply. Common centrifugal governors include the Watt, Porter, Proell, and Hartnell governors which differ in their specific configurations and controlling mechanisms like dead weights or springs. The governor acts to maintain a constant average speed as the engine load varies.
This document provides information about steam nozzles and steam turbines. It discusses:
1. Steam nozzles convert the heat energy of steam into kinetic energy by accelerating steam through a passage of varying cross-section.
2. Steam turbines convert the high-pressure, high-temperature steam from a steam generator into rotational shaft work.
3. There are three main types of nozzles used in steam turbines: convergent, divergent, and convergent-divergent. Convergent-divergent nozzles are widely used today.
4. The document then discusses concepts like Mach number and critical pressure that are important for steam nozzle and turbine operation.
This document discusses dynamics of rotating machinery with an emphasis on balancing. It covers balancing fundamentals, critical speeds and vibratory modes, damping, bearings and support structures. Case studies on balancing of a 115 MW generator rotor are presented, showing vibration measurements before and after balancing. Details of the generator rotor, balancing planes and trial weights used are provided. Common vibratory modes like rocking, conical and bending modes are explained. The document also discusses turbo machinery damping mechanisms and hydrodynamic bearings.
El fotógrafo Peter Menzel viajó por el mundo durante varios años fotografiando a 30 familias de 24 países diferentes junto con los alimentos que consumirían en una semana y los gastos de cada familia. El libro resultante, Hungry Planet, muestra las grandes diferencias entre los países en términos de tamaño familiar, productos consumidos y gastos semanales en alimentos, que variaron desde $5.03 por semana para una familia en Bután hasta $500.07 por semana para una familia en Alemania.
INTRODUCTION TO PUMPS, COMPRESSORS, FANS & BLOWERS.pdfBagusSigit3
Centrifugal pumps operate by using a rotating impeller to impart velocity energy to the fluid being pumped. As the fluid passes through the impeller blades, it is accelerated outward and converted to pressure energy upon exiting the pump casing. There are two main categories of pumps - positive displacement pumps which move a fixed volume of fluid per rotation, and centrifugal pumps which increase fluid velocity and pressure through centrifugal action. Centrifugal pumps are commonly used and consist of an impeller, casing, and volute. Pump performance is represented by curves showing head versus flow rate. The operating point occurs where the pump curve intersects the system curve for a given application.
This document provides an overview of radial piston pumps. It defines a radial piston pump as a type of hydraulic pump where the working pistons extend radially from a central drive shaft. The document discusses the construction, working, properties, advantages, and applications of radial piston pumps. It notes that radial piston pumps can produce smooth flow under extreme pressure and are commonly used in machine tools, hydraulic systems, and the automotive industry.
Bent shaft vibration is caused by a bent shaft in a machine. A bent shaft can occur due to manufacturing defects, shipping damage, or uneven wear over time. Key signs of a bent shaft include high 1x axial vibration, a dominant 1x peak in spectral analysis, and 180 degree phase difference in axial vibration measurements across the machine. Identifying these vibration characteristics can indicate the presence of a bent shaft requiring repair or replacement.
Introduction, classification, principle of working and constructional details of vane pumps, gear pumps, radial and axial plunger pumps, screw pumps, power and efficiency calculations, characteristics curves, selection of pumps for hydraulic Power transmission.
The document discusses centrifugal pumps, including their basic principles and operation. It describes the main parts of a centrifugal pump like the impeller, casing, shaft, and bearings. It explains key concepts such as pump head, net positive suction head (NPSH), affinity laws, and pump curves. The document also covers pump operation, including proper start up and shut down procedures, as well as potential problems that can occur.
A governor is a device that regulates the speed of an engine by controlling the fuel supply. There are two main types - centrifugal and inertia governors. Centrifugal governors use rotating masses (flyballs) where the centrifugal force is balanced by a controlling force like tension in the arms. As speed increases, the flyballs rise and the controlling mechanism reduces the fuel supply. Common centrifugal governors include the Watt, Porter, Proell, and Hartnell governors which differ in their specific configurations and controlling mechanisms like dead weights or springs. The governor acts to maintain a constant average speed as the engine load varies.
This document provides information about steam nozzles and steam turbines. It discusses:
1. Steam nozzles convert the heat energy of steam into kinetic energy by accelerating steam through a passage of varying cross-section.
2. Steam turbines convert the high-pressure, high-temperature steam from a steam generator into rotational shaft work.
3. There are three main types of nozzles used in steam turbines: convergent, divergent, and convergent-divergent. Convergent-divergent nozzles are widely used today.
4. The document then discusses concepts like Mach number and critical pressure that are important for steam nozzle and turbine operation.
This document discusses dynamics of rotating machinery with an emphasis on balancing. It covers balancing fundamentals, critical speeds and vibratory modes, damping, bearings and support structures. Case studies on balancing of a 115 MW generator rotor are presented, showing vibration measurements before and after balancing. Details of the generator rotor, balancing planes and trial weights used are provided. Common vibratory modes like rocking, conical and bending modes are explained. The document also discusses turbo machinery damping mechanisms and hydrodynamic bearings.
El fotógrafo Peter Menzel viajó por el mundo durante varios años fotografiando a 30 familias de 24 países diferentes junto con los alimentos que consumirían en una semana y los gastos de cada familia. El libro resultante, Hungry Planet, muestra las grandes diferencias entre los países en términos de tamaño familiar, productos consumidos y gastos semanales en alimentos, que variaron desde $5.03 por semana para una familia en Bután hasta $500.07 por semana para una familia en Alemania.
2. SARRERA
Zirkuitua ustekabean sor daitekeen gehiegizko karga
batetik babesten duten gailuak dira:
fusibleak, automatikoak, diferentzialak...
Zirkuitulaburra zirkuituak bi punturen artean
erresistentziarik ez duenean gertatzen da;
hau da, polo positiboa eta negatiboa oztoporik gabe
elkartzen dira.
Fusiblea elektrizitatean erabiltzen den gailua da. Gailu hau euskarri egoki bien artean kokaturiko haria edo fusio-puntu txikia duen matalezko xafla bat da zein, instalakuntza bateko puntu jakin batean tartekatzen dena, bera zeharkatzen duen korronte intentsitatea zirkituko beste atalak desegiteko edo erretzeko moduko balio hartzen duenean urtu dadin.
Etxean energia-kontsumoa mugatzeko modua da, eta hortik gora behar izanez gero, elektrizitatea eten egingo da eta beste tarifa bat ordainduta lortuko genuke beharko genukeen energia kantitatea. Beraz, kontrolerako eta neurketarako elementua dugu, baina ez da babeserako.
Etengailu automatikoa dugu, eta babes-funtzioa dauka, izan ere, honelakoetan salto egiten du eta energiaren pasoa eten egiten du: Gainkargak, gaintentsioak eta zirkuitulaburrak
Etengailu automatiko ere da eta babes elementua da: Korrote-deribazioei aurre egiten die, sartzen den sarrerako korronte.intentsitatea eta irteten den irterako korronte-intentsitatea berdina ez badira salto egiten du, salto egiteaz aparte soberan dagoen korronte intentsitatea hori lur eroaletik bideratzen da.
Potentzia handiko zirkuituak lur-eroalera konektatuta doaz, deribazio-korronteak gure gurputzera pasa beharrekoan diferentzialak salto egingo du eta lurrera bideratuko dira eroale honen bidez. Etxe barneko lurraren zirkuitua lurrera bideratzeko errealitatean metalezko pieza baten bidez egiten da: iltzen bat bezala lurrean sartzenda eta eroale baten bidez lurraren zirkuituarekin konektatzen da.
Magnetotermiko txikiak dira baina bakoitzak zirkuitu bakarra biderazten du.
