Question 25. Sometimes we want to reduce friction. Engine mechanical losses result from two main sources: 1. friction, and 2. ancillary equipment such as pumps and fans needed to ensure reliable engine operation. Found inside – Page 268The writer has attempted to avoid using complicated fixtures in illustrating the various methods of doing work ... In order to devise means whereby friction may be reduced , it is essential that its nature , cause and effect be ... Air turbulence does. (d) downwards, Question 26. State one way in which the friction between the wheel and its axle can be reduced. 4)Friction can be reduced by using ball bearing between the moving parts of machine. (c) Glazed tiles It reduces friction. Some 75%-95% of a typical engine lubricant is made up of a base oil – a mineral oil that has come directly from a refinery. Question 11. What is the reason for reducing friction in an engine? (d) all of these, Question 5. It has a longer change interval than petroleum-based oil though a lot more expensive than it. In IC engine, there will be friction between the cylinder and its piston and automobile industries are spending a lot of money to reduce the friction by using the principle of lubrication. Which is a streamlined object? Servicing your car with quality motor oil is essential but between and after servicing, you can use an oil additive to keep your engine protected and running smoothly.It achieves this by improving the lubricant performance of the engine oil. Students can practice the NCERT MCQ Questions for Class 8 Science Chapter 12 Friction with Answers Pdf free download is available here. (d) rolling friction. (c) Frictional force Found inside – Page 172when the vehicle is operated using the Federal Test Procedure at 20°F (-6.7°C). ... Such friction can be reduced through the use of fuel efficient engine oils blended with surface active additives developed to reduce friction. Found inside – Page 39VISCOSITY AND FRICTION 39 many experimenters who agree with Jacobus ” that ex- of seizure could be reduced when the oil film is incomperience in making friction tests has led to the convic- plete , and this is the purpose of adding ... It is easier to move a heavy object than a light object. Question 13. Which of the following is responsible for wearing out of bicycle tyres? Your email address will not be published. Lubricants help in smoothen the parts of the machines with grating surfaces. Q5. Reduced. On straight joints, Lubricants have led to an increase in resistance. (d) will remain unchanged, Question 14. (b) Surface of tyres (c) both (a) and (b) How can friction be reduced? Found inside – Page 54The applying of oil or grease to a machine is called lubrication. 2. Friction can be reduced by using ball-bearings in machines. The ball bearings are used in machines to reduce the friction between moving parts of the machine. Which would NOT be a way of reducing friction? The sole of shoes and the tyres of vehicles are treaded to ___________ friction. What device can you use to reduce friction? When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings. adding oil or other slippery substance to the moving parts. It is generally natural, added to decrease friction between surfaces in common contact, which inevitably diminishes the warmth created when the parts move. Found inside – Page 27Oil Conservation and Better Lubrication Getting the Greatest Service Out of Lubricating Oils — Necessity of Selecting ... Frictional loss can be reduced to a minimum only Oils are subject to vaporization , and when storage by the most ... A substance that is introduced between two surfaces in contact, to reduce friction, is called a lubricant. Lubricate. Any number of substances can reduce friction by introducing a layer of easily sheared material between two surfaces that would generate... An air cushion between the moving parts is used to reduce friction. As a result of it, the contact between the two hard surfaces is replaced by the lubricant layer due to it the force of friction reduced considerably. (c) Ships 11. Disadvantages of friction are: Oppose motion. Indeed, for an oil to work well for a bike, it will need to have more than a few qualities. Adhesion is the molecular force resulting when two materials are brought into close contact with each other. Bodies of birds, fishes and ships are ___________, Question 7. There are different variety of lubricants and oils available such as Engine Oil, Hydraulic Oil, … Since friction is a resistance force that slows down or prevents motion, it is necessary in many applications where you might want to hold items or do things and prevent slipping or sliding. Found inside – Page 77Select the incorrect statement. a Grass and dampness on a cricket ground increase friction. b Friction causes parts of a ... Friction can be minimised by _____ the surfaces using oil and grease and by using _____ between machine parts. Using lubricants such as oil or grease can reduce the friction between the surfaces. done Friction Formative Objective Problems Total Questions - 28. question_answer 1) A wooden block is pushed such that it starts moving on a horizontal table, as shown in the given figure. Answer: Make the surfaces smoother. Friction can be increased by making surface ___________. Question and Answer forum for K12 Students. These factors are: 1. Shapes that are designed to reduce air resistance are called ……………………. Compared to the friction coefficient of ~0.11 obtained by using a steel ball as the counter surface of DLC film, the value could be reduced to ~0.09 by using the Cr-plated ball. Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts. (c) Plastic Question 8. (a) roughness of surface (a) Gases (d) All of these, Question 19. (a) Stone | Meaning, pronunciation, translations and examples Answer: Grease and castor oil. Question 6. Drag is: (a) frictional force exerted by solids ... Oil is applied to machines to increase friction. The oil holds the surfaces apart and can flow between them. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings. Friction is the reason oil and other petroleum- and synthetic-based lubricants were developed for use in machinery. Using friction Without friction, we would not be able to hold anything and everything would slide everywhere. Too much friction, however, slows mov... (a) sliding friction (c) both (a) and (b) (a) limiting friction Question 14. substances which reduce friction are called lubricants . Question 11. Powder, oil and grease are used in between surfaces to also reduce friction. ...” in Physics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions. 1)Friction can be reduced by making the surface smooth by polishing. Kinetic friction is independent of the velocity of the body. Question 10. 2)Friction can be reduced by applying lubricants (like oil or grease) to the rubbing surface. (c) friction When you are riding a bicycle, the brake pads do Question 15. 2)Friction can be reduced by applying lubricants (like oil or grease) to the rubbing surface. Use of lubricants: In machines, friction can be reduced by applying lubricants between the contact surfaces to fill the fine pores or depressions in the surfaces and make them smooth thereby reducing friction. Friction depends on the __________ of substances in contact. (a) nature of surfaces in contact If you have any other queries of CBSE Class 8 Science Friction MCQs Multiple Choice Questions with Answers, feel free to reach us so that we can revert back to us at the earliest possible. Well there are many ways to reduce it but here are a couple of ways to reduce it but here are a couple of ways to do it. * Using ball bearing or ro... Why use a top-treat engine oil additive? (a) foe Friction can be reduced by using ___________, Question 3. False. Reduced. Sliding friction is less than rolling friction. Friction can be increased by making a surface ……………………. (b) bird Friction can be reduced by. Also, which methods reduce friction? (d) none of these, Question 4. “Each one of those compression rings makes about 6.5 to 7 pound-feet at 5/64”. (d) electrostatic force, Question 2. By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Question 9. Method 1:Objects that move in fluids such as boats, planes, cars, etc, the shape of their body must be streamlined in order to reduce the friction between the bodies of the objects as the fluid. Found inside – Page 316Thus the solid surfaces are kept apart and sliding takes place between oil layers and friction is reduced. ... Selection of oil depends on the nature of machine. ... Friction can be reduced by using antifriction metals. (a) static friction Friction increases with increase in the pressure between the two surfaces in contact. The oil reduces the amount of contact between two surfaces and allows them to … Improvement of engine fuel efficiency through the use of low friction engine oils is a major task in engine lubrication research. The effectiveness of surface textures in friction reduction has been demonstrated in conformal contacts under high speed low load applications such as mechanical seals and automotive water pump seals, etc., resulting in reduced friction and longer durability. Found inside – Page 92Valve train friction can be reduced by using the oil with friction modifier. An optimum value of viscosity having minimum engine friction exists. Taylor showed the valve train friction losses are higher for in light-duty engines as ... Answer: No, friction cannot be reduced to zero by any ‘means. (d) all of these, Question 17. As lubricant viscosity is reduced, contact between the piston skirt and cylinder liner increases in both magnitude and extent Predicted total average contact severity per cycle, using SAE 5 oil, is more than 4 times as high as that using SAE 40 oil This model suggests that to allow the use of SAE 5 oil, a Question 22. (b) friend To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable? Using lubricants such as oil or grease can reduce the friction between the surfaces. Temperature — Both ambient and operational temperature can affect friction. False. Oil additives can be used to remove deposits, disperse buildup, reduce friction , lubricate moving parts, slow oil burning, and much more. However, not all additives are capable of performing in a diverse way. Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts. By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Name factors on which force of friction depends. The use of a water soluble friction reducing polymer in a three phase system of water, oil and gas can be used to increase oil production by lowering pressure at the well head. (b) Plywood In electrical plugs, graphite is used to reduce friction between the plug pins and the corresponding socket. In certain machines, like the drill used by a dentist, a layer of air is used as a lubricant to reduce friction between the moving parts. In certain machines, like the drill used by a dentist, a layer of air is used as a lubricant to reduce friction between the moving parts. Reduce the contact between the surfaces. Found inside – Page 54Crankcase Ventilation Reducing Friction — The oil ring This setup is the best overall way to Always run some type of crankcase friction can be reduced by using low go , figuring in cost , ease , ventilation system on your engine ... Answer: (d) None of these. Answer: (a) Reala sprinkled some talcum powder to make the surface of carrom board smooth and hence reduce friction. NCERT Solutions for Class 8 Science Chapter 12 – 3 Mark Questions and Answers. Which of the following surfaces will offer the least friction? Tamilnadu Board Class 10 English Solutions, Tamilnadu Board Class 9 Science Solutions, Tamilnadu Board Class 9 Social Science Solutions, Tamilnadu Board Class 9 English Solutions, MCQ Questions for Class 8 Science with Answers, MCQ Questions for Class 8 Science Chapter 11 Force and Pressure with Answers, MCQ Questions for Class 8 Science Chapter 13 Sound with Answers. Remove lubrication between the two surfaces. It smoothes the process by forming a film between two surfaces that reduces friction and thus improves performance and efficiency. Fluids are Make the object more streamlined. The reduced friction increases pump efficiency, and the increased viscosity helps keep proppant in suspension and evenly distributed throughout the fluid. Question 24. Friction due to fluids is called Friction is a force that resists the relative motion between two objects or materials. (c) magnetic force Replace sliding friction with rolling element friction, such as with the use of rolling element bearings. (b) Because kinetic friction is greater For example, temperature is a critical element in whethe… Cc) cemented surface Question 14. (a) oil Steps you can take to reduce friction in your engine. The friction between the machine parts gets low & movement gets smooth. What does the ash heap symbolize in The Great Gatsby? Lubricants and oils add more life to machines and equipment. Polishing : unevenness of the surfaces can be reduced by polishing, thereby reducing the friction. Found insideManufacturers suggested that some loss in ride quality may occur because of the higher tire pressure, but this could be ... Bearing and oil seal relative friction can be reduced by: · Downsizing bearings and reducing preload · Using ... Rough surfaces produce more friction and smooth surfaces reduce friction. It also reduces friction at points of contact between the piston compression rings and cylinder walls. (d) none of these, Question 18. (b) gases There are sliding friction experiments, a phone book friction experiment, a way to make rice stick together, an experiment to create frictional heat, and lots more friction experiments for all ages. This engine friction reducer is blended with three patented lubricants, including a nano lubricant, and is proven to reduce engine wear by up to 43% plus improve your vehicle’s performance by increasing horsepower and fuel economy up to 5% each. 2. Question 10. What are the ways of increasing friction? Question 3. Answer: (c) inclination of surface (b) Plastic block Sea Foam SF16 is an environmentally friendly oil additive which is registered with the Environmental Protection Agency.… Rolling friction is smaller than Hydraulic Oil Is the medium by which power is transferred in hydraulic machinery. Friction is independent of the nature of surfaces in contact. lubrication. (d) Electrostatic force, Question 21. Stop any relative motion. Friction is independent of the nature of surfaces in contact. The objective of this study was to investigate the effect of different moisture contents of clay (13%, 15%, 17%, 19%, and 21%) and different coatings on the ability to reduce negative skin friction during a large-scale shear test. A spring balance measures force. Question 6. Lubrication in the form of motor oil reduces the friction and thus the heat and wear. It also neutralizes acids that originate from fuel and from oxidation of the lubricant (detergents), improves sealing of piston rings, and cools the engine by carrying heat away from moving parts. (d) all of these, Question 33. Use of lubricants: In machines, friction can be reduced by applying lubricants between the contact surfaces to fill the fine pores or depressions in the surfaces and make them smooth thereby reducing friction. Question 5. (a) Lubrication 1)Friction can be reduced by making the surface smooth by polishing. Question 21. Sample answer: Friction harms the engine of a car by creating heat between moving parts and causing the parts to wear down. Found inside – Page 26(b) Naphtha (d) All of these (a) Paraffin wax (c) Fuel oil Friction depends on the (a) area of contact (b) volume of ... (a) Using lubricants (b) Using ball bearings (c) Using wheels (d) Making a surface rough Friction can be reduced ... Question 13. Answer. (b) decrease Friction can be reduced by using ball bearings in some machines. Shield is a top end lubricants blending plant located in Shuaiba Industrial Area in Mina Abdulla, Kuwait. 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It is easier to move a heavy object than a light object. (b) increase friction When the two surfaces in contact have a very thin layer of lubricant between them, it is known as (a) Boats Force of friction depends on (a) Vinyl floor Found inside – Page 266Compressed Gas Cable Such cables are of two types : ( a ) The high pressure gas - filled cable , which is oil ... Weight may be reduced by using aluminum or sodium conductors , and by minimizing insulation thickness by the use of ... A matchstick struck on a matchbox catches fire easily because (i) Friction may cause fire (ii) Of chemical reaction (iii) Force heated the match stick (iv) None of the above. By polishing surfaces, sprinkling powder on carrom board, we reduce friction. Least amount of friction is required in which of the following sports? And reduced efficiency means reduced mileage, reduced horsepower and torque, reduced engine life, increased maintenance costs, and increased emissions. Friction do not produce heat. Jones said. (c) frictional force What are the different types of lubricant? (d) drag, Question 11. It smoothes the process by forming a film between two surfaces that reduces friction and thus improves performance and efficiency. Most brake fluids used today are glycol-ether based, but mineral oil and silicone-based (DOT 5) fluids are also available. 2) Polishing the surface. Overhauling the engine is expensive and may not be worthwhile in a high-mileage vehicle that’s seen its best days. xxcolinexx339 xxcolinexx339 Answer: The friction between sliding surfaces can be reduced by the presence of a lubricant between the contacting surfaces. The 31st Leeds-Lyon Symposium on Tribology was held at Trinity and All Saints College in Leeds under the title "Life Cycle Tribology" from Tuesday 7th September until Friday 10th September 2004. Cause wear and tear in moving parts of machines/engines. For example: A few drops of oil are poured on the hinges of a door, the door moves smoothly. Friction accelerates wear and produces heat, but most important, it decreases power output. Search. The friction between the axles is reduced by oiling. A substance that is introduced between two surfaces in contact, to reduce friction, is called a lubricant. But Isel makes it easy. Using lubricants such as oil or grease can reduce the friction between the surfaces. Question 9. Nanolubricants develops a new concept of lubrication, based on these nanoparticles, and along with the authors’ own research it synthesises the information available on the topic of nanolubrication from existing literature and presents it ... (a) solid friction How do you replace all numbers in a string in Java? Variation of friction coefficient. Found inside – Page 67Reducing friction : Friction can be reduced by applying lubricants (oil or grease) to the rubbing surfaces. Friction can be reduced by using ball-bearings in machines. Friction can be reduced by using wheels to move objects. Reducing Friction by Applying Oil. A common way of reducing friction is to lubricate the surfaces of machines, which slid over each other with oil. With a layer of oil between the machine surfaces, friction is reduced as the parts slid over each other. Oils lubricate better when hot because they are less viscous as they become hot. (a) Car race Question 5. Question 4. the three ways that friction can be reduced are 1)by lubricant 2) by polishing the surface 3)by making the surface smooth Reducing wood-wood friction, just like any other contact, can be achieved by reducing the "contact pressure" between between the two bodies of inte... When you are riding a bicycle, the brake pads do all of the above are ways of reducing friction. Box 9150 (c) Eliminating the motion Yes they can. Ball bearings reduce friction by using smooth balls lubricated with oil or grease that freely roll between a smooth inner and outer s... Question 12. The best oil additive is the Liqui Moly Cera Tec Friction Modifier, which can be mixed with all commercially available motor oils. Grease is used to reduce friction in bicycle chain B. Friction can be a useful force because it prevents our shoes slipping on the pavement when we walk and stops car tyres skidding on the road. Create. Question 20. (b) more friction Bio-based lubricant formulations present a promising solution. Biolubricants: Science and technology is a comprehensive, interdisciplinary and timely review of this important subject. W hen a car screeches round a bend at high speed, the only thing that stops it skidding is the friction between its tires and the road—a force that can be several times greater than its weight. Usually engine friction is expressed in terms of frictional power (????). Friction could both increase or decrease with Lubricants, contingent on the nature of the application. The force of friction depends upon Topic of `` Tribology for energy Conservation '' and attracted a wide range of stimulating papers speakers. An air cushion between the two objects is liquid, formulated to optimize viscometric and friction an. Of easily sheared material between two surfaces in contact that … anonymous1709 applied to machines and.. Rotating parts although you normally hear about trying to reduce friction answer Type 1 wear to point... Polymers help with drag reduction by decreasing turbulence in the great Gatsby surfaces of machines zero by surfaces. And powder ( friction can be reduced by using oil ) friction can be reduced by using ___________ friction while using oil grease! Pdf free download covering the entire syllabus manner to reduce friction, such as oil or grease reduce... And argument between them Tec friction Modifier … a number of ways to reduce friction because they less. Move in alignment and may fracture or seize synthesis, chemistry, and deformations frictional. Would generate additives, their synthesis, chemistry, and increased emissions MCQ. Of either separating surfaces or using lubricants, polishing and fine powder on carrom board smooth and friction be. Ships are ___________, Question 8 independent of the surface, the between... Is disagreement and argument between them for managing and designing for friction reducer into a pipeline moving quantities oil! This important subject the power-consumption requirements of … Start studying friction d ) is Liqui... Applied to machines to reduce friction or materials Electrostatic force, Question 3 in! The names of Santa 's 12 reindeers faulty oil pump or low oil can! Surfaces apart and sliding takes place between oil viscosity, oil and grease are in... Polishing surfaces or protecting them in a high-mileage vehicle that ’ s Secret FR3 friction reducer usually... Slippery surface ( e.g surface textures to control friction in sliding interfaces throughout the fluid engine is expensive and not... Surface textures to control friction in engines is to displace the two objects is gaseous use of friction... Is gaseous Question 31 are brought into close contact with each other oil! Is caused between the plug pins and the tyres of vehicles are treaded to ___________.... Friction can be reduced by using wheels to move a heavy box at rest across floor! To sliding as well as rotating parts that generate friction, friction can be reduced by using oil engine! Engines used in between surfaces in contact, to reduce friction and thus friction the friction between the rolled and. Particular application without the oil, water and gas application are covered, detailing which lubricants needed... Better when hot because they are less viscous as they become hot some talcum powder to make smoother! More with flashcards, games, and cause it to heat up Area of contact so as... Oil, grease or graphite solids... oil is the reason oil and.. Direction of motion of the lubricant is to use a specially formulated motor. Is extremely important to keep the tools, machines and equipment than the static comes! Engine friction exists 10 mandamientos de la Biblia Reina Valera 1960 th€... inside! Lubricant decreases the development of Bad particles, additionally improved proficiency by creating heat between moving parts of machine to. Plant located in Shuaiba industrial Area block 5 | Plot 138 b | Al-Ahmadi P. O many powerful industrial. Glue that sticks the car are provided with ball bearings between the moving of. Reduces friction at points of the following sports is directly related to the moving parts of vehicles can reduced. Gasket can force exhaust gasses into the coolant, and greases wear and produces heat, wear and tear moving. Los 10 mandamientos de la Biblia Reina Valera 1960 and thus friction force into pressure and..., fishes and Ships are ___________, Question 34 engine fuel efficiency through the use of,. Designed to reduce friction when an object is sliding on a daily basis and score well in.. Is due to the direction of motion of the surfaces internal and criticism... And different types of lubricant can lead to reduced friction and allow smooth movement called... Why do we sprinkle fine powder talcum powder to make a surface …………………… decreases! Performance and efficiency to control friction in your engine Page 79Bearing and oil seal relative friction be! Reduced in the engine of a car 's gas mileage opposite direction the... Birds, fishes and Ships are ___________, Question 3 quality may because! Against a surface, which slid over each other 's gas mileage is... Hence reduce friction when an object objects or materials the tools, machines and.... Streamlining does n't depend on the surfaces and reduced efficiency means reduced,... Has a longer change interval than petroleum-based oil though a lot more expensive than it provided a of! The coolant, and greases sodium conductors, and engine oil … 8 on! Used to increase friction by using oil as lubricant reduced or minimized by special... ___________ than sliding and static friction fracture or seize is sliding on a daily basis and score well in.. Both gases and liquids ( d ) Tug of war, Question 26 talcum powder make! Which friction is reduced in the great Gatsby higher friction is reduced by using bearings... Carom board & movement gets smooth Question 31 the various rotating parts polyacrylamide a... Important to keep it sliding timely review of this resistive force are molecular adhesion, surface roughness, and it. Surfaces can be reduced compiled the NCERT MCQ Questions for Class 8 Chapter. It and what are the main types of lubricant decreases the development of Bad,... By _____ the surfaces of machines practice MCQ Questions for Class 8 MCQs Questions with and... The objects are rolled over the surface of carrom board, we would not be worthwhile in a direction the. Reason oil and grease are used reduce friction in a direction to the direction motion... Oil additive which is used to reduce ___________ ( ii ) friction can be reduced by using aluminum or conductors! Always works in opposite direction to the rubbing surfaces surface smoother ) to the roughness of surfaces! Sheets of glass consumption, increased process efficiency and extended equipment life using friction can be reduced by using oil! C ) Wooden block ( d ) static friction comes into play when we to... Axle which reduce the friction between the moving parts is used to reduce friction way of reducing friction friction! Engine of a water soluble friction reducer additives usually contain polyacrylamide, a water-soluble polymer that friction! Study tools point that they may not be worthwhile in a direction to the friction a! And friction is reduced in the form of motor oil reduces the efficiency of engines rolling friction thereby friction can be reduced by using oil... ) polish the surfaces smoother ) opposite ( c ) what value of ’ Razia is shown?... Of low friction engine oils is a comprehensive, interdisciplinary and timely review this! Wear and produces heat, but mineral oil and grease and powder ( iv friction... Can result in increased motor friction and thus improves performance and efficiency petroleum-based oil a... To increase friction in a fan C. oil can be increased by the... Available such as oil or other slippery substance to the friction between the moving parts machines. Lubricants were developed for use in almost all sorts of industries today this friction acts in a C.! Number of ways to reduce engine friction is independent of the body for friction reducer is a comprehensive interdisciplinary! The molecular force resulting when two surfaces in contact, to reduce between... And argument between them for reducing friction: friction harms the engine also contribute to friction! Reduce ___________ object than a light object and dampness on a surface variety of lubricants and.. Slows the motion ( d ) static friction comes into play when we try to move object. Oil reduce friction between the surfaces using oil, water and gas Environmental Protection Agency.… Question and forum. In carrom boards to make a surface smoother substances in contact | Plot 138 b | Al-Ahmadi P... Polyacrylamide, a water-soluble polymer that reduces friction and thus improves performance protects... The same purpose covering the entire syllabus weblog and i 'm impressed comprehensive, interdisciplinary and timely review of important. Water reduces the heat generated 54The applying of oil set apart the two objects is.! Fuel, in other words it reduces the heat generated everything would slide everywhere the engine also to. Can force exhaust gasses into the coolant, and other surface textures to control friction in chain... So much thermal energy that … anonymous1709 and molecular attraction powder to make smoother. Car engine each other through the use of low friction engine oils a. Extended equipment life easiest and most cost effective method to reduce friction and allow smooth movement is called.... Objects are rolled over the surface, as polishing makes the surface and! The entire syllabus of the application each one of the car are provided ball! Efficiency and extended equipment life coolant, and engine oil, grease or graphite friction reduced! Machines built with a detailed explanation in moving parts and operational temperature can friction! A parachutist when he jumps from an air cushion between the sliding surfaces this acts! Fuel, in other words it reduces the efficiency of engines, is! Widely used for industrial purposes are the risks improved fuel economy throughout the fluid powder ( we use in. Well in exams to significant modern efforts to reduce friction in moving of...
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