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Why first angle and third angle projection method is used in machine design and why second and fourth angle method is not used?
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Electronic water pumps in Feilong
http://autonews.gasgoo.com/china_news/70015383.html Lincoln's first China-made model will be an all-new SUV model and the mass-produced Aviator, which is set to be unveiled at the 2018 LA Auto Show later this month, will be introduced by Changan Ford and hit the market at the end of 2019. To meet Chinese consumers’ demands, the automaker will make the locally-produced models adjusted in exterior, interior and powertrains. The annual output of chongqing feilong pump is 2 million, and the annual output of oil level is 1.6 million.It is expected to realize multiple power production of electronic pump in 2020.
Early damage of turbocharger caused by improper operation
The service life of turbochargers on automobiles should be more than 150,000 kilometers if they are properly used and maintained. However, due to the improper operation of some drivers and maintenance personnel irregular maintenance: it will cause unnecessary damage to the turbocharger, so as to shorten its service life. Modern cars can start without preheating after starting, but engines with turbochargers must idle for a few minutes before starting. If the engine starts as soon as it is started, the turbocharger rotor bearing will not be fully lubricated before high-speed operation, resulting in the early damage of the rotor floating bearing. Increasing the throttle load immediately after starting will accelerate the wear and tear between the rotor shaft and the floating bearing because of the oil-free lubrication of the supercharger bearing, and even jam. The engine suddenly stalls at high speed, while the rotor in the turbocharger is still spinning at high speed due to inertia, which will cause the floating bearings to be worn out or even ablated due to high temperature and lack of lubrication. The engine with turbocharger can not run idle for a long time. Because when the engine is idling for a long time, there is negative pressure behind the turbocharger turbine and the compressor impeller. Under the pressure difference, the oil from the floating bearing will leak out. This is also one of the reasons why the turbocharger engine often has less oil.
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Fit_and_Dimensional_Tolerances
Fit_and_Dimensional_Tolerances_Mechanical_Engineering_Drawing Source Ashish K Darpe Department of Mechanical Engineering IIT Delhi Thanks to Mr. Ashish K Darpe Regards Saurabh Jain
introduction to cfd Computational fluid dynamics
its useful ppt about CFD •Computational fluid dynamics (CFD) is the science of predicting fluid flow, heat transfer, mass transfer, chemical reactions, and related phenomena by solving the mathematical equations which govern these processes using a numerical process.
Geometric Dimensioning and Tolerancing
Geometric Dimensioning and Tolerance ppt Five powerpoint presentations
Metal Forming
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Mechanical Engineering Questions
Which of the following impurity in cast iron makes it hard and brittle ?
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Which type of lubrication system is this?
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What is difference between riveted joint and welding joint ??
What is difference between riveted joint and welding joint ?? 1. You can answer this question 2. You can like the best answer 3. You can share the question...
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From class Notes
18 Mechanical Properties Which Every Mechanical Engineer Should Know
Selection of material is an important aspect for manufacturing industries . The quality of product is highly depends upon its material properties. These properties are used to distinguish materials from each other. For Example: A harder material is used to make tools.A ductile material is used to draw wires. So the knowledge of mechanical properties of material is desirable for any mechanical student or for any person belongs to mechanical industries. This post brings top 18 mechanical properties. Mechanical properties of material: There are mainly two types of materials. First one is metal and other one is non metals. Metals are classified into two types : Ferrous metals and Non-ferrous metals. Ferrous metals mainly consist iron with comparatively small addition of other materials. It includes iron and its alloy such as cast iron, steel, HSS etc. Ferrous metals are widely used in mechanical industries for its various advantages. Nonferrous metals contain little or no iron. It includes aluminum, magnesium, copper, zinc etc. Most Mechanical properties are associated with metals. These are #1. Strength: The ability of material to withstand load without failure is known as strength. If a material can bear more load, it means it has more strength. Strength of any material mainly depends on type of loading and deformation before fracture. According to loading types, strength can be classified into three types. a. Tensile strength: b. Compressive strength: 3. Shear strength: According to the deformation before fracture, strength can be classified into three types. a. Elastic strength: b. Yield strength: c. Ultimate strength: #2. Homogeneity: If a material has same properties throughout its geometry, known as homogeneous material and the property is known as homogeneity. It is an ideal situation but practically no material is homogeneous. #3. Isotropy: A material which has same elastic properties along its all loading direction known as isotropic material. #4. Anisotropy: A material which exhibits different elastic properties in different loading direction known as an-isotropic material. #5. Elasticity: If a material regain its original dimension after removal of load, it is known as elastic material and the property by virtue of which it regains its original shape is known as elasticity. Every material possess some elasticity. It is measure as the ratio of stress to strain under elastic limit. #6. Plasticity: The ability of material to undergo some degree of permanent deformation without failure after removal of load is known as plasticity. This property is used for shaping material by metal working. It is mainly depends on temperature and elastic strength of material. #7. Ductility: Ductility is a property by virtue of which metal can be drawn into wires. It can also define as a property which permits permanent deformation before fracture under tensile loading. The amount of permanent deformation (measure in percentage elongation) decides either the material is ductile or not. Percentage elongation = (Final Gauge Length – Original Gauge Length )*100/ Original Gauge Length If the percentage elongation is greater than 5% in a gauge length 50 mm, the material is ductile and if it less than 5% it is not. #8. Brittleness: Brittleness is a property by virtue of which, a material will fail under loading without significant change in dimension. Glass and cast iron are well known brittle materials. #9. Stiffness: The ability of material to resist elastic deformation or deflection during loading, known as stiffness. A material which offers small change in dimension during loading is more stiffer. For example steel is stiffer than aluminum. #10. Hardness: The property of a material to resist penetration is known as hardness. It is an ability to resist scratching, abrasion or cutting. It is also define as an ability to resist fracture under point loading. #11. Toughness: Toughness is defined as an ability to withstand with plastic or elastic deformation without failure. It is defined as the amount of energy absorbed before actual fracture. #12. Malleability: A property by virtue of which a metal can flatten into thin sheets, known as malleability. It is also define as a property which permits plastic deformation under compression loading. #13. Machinability: A property by virtue of which a material can be cut easily. #14. Damping: The ability of metal to dissipate the energy of vibration or cyclic stress is called damping. Cast iron has good damping property, that’s why most of machines body made by cast iron. #15. Creep: The slow and progressive change in dimension of a material under influence of its safe working stress for long time is known as creep. Creep is mainly depend on time and temperature. The maximum amount of stress under which a material withstand during infinite time is known as creep strength. #16. Resilience: The amount of energy absorb under elastic limit during loading is called resilience. The maximum amount of the energy absorb under elastic limit is called proof resilience. #17. Fatigue Strength: The failure of a work piece under cyclic load or repeated load below its ultimate limit is known as fatigue. The maximum amount of cyclic load which a work piece can bear for infinite number of cycle is called fatigue strength. Fatigue strength is also depend on work piece shape, geometry, surface finish etc. #18. Embrittlement: The loss of ductility of a metal caused by physical or chemical changes, which make it brittle, is called embrittlement.
Types of Welding
Welding is a process of joining similar and dissimilar metals or other material by application of heat with or without application of pressure and addition of filler material. It is used as permanent fasteners. Welding is essential process of every manufacturing industries. In fact, the future of any new metal may depend on how far it would lend itself to fabrication by welding.
The weldability has been defined as the capacity of being welded into inseparable joints having specified properties such as definite weld strength proper structure. The weldability of any metal depends on five major factors. These are melting point, thermal conductivity, thermal expansion, surface condition, and change in microstructure. Types of welding: Basically welding may be classified into three types. 1. Plastic welding: In plastic welding or pressure welding process, the pieces of metal to be joined are heated to a plastic state and then forced together by external pressure. These welding are also known as liquid-solid welding process. This procedure is used in forge welding and resistance welding. 2. Fusion welding: In the fusion welding or no pressure welding process, the material at the joint is heated to a molten state and allowed to solidify. These welding are also known as liquid state welding process. This includes gas welding, arc welding, thermite welding etc. 3. Cold welding: In this welding process, the joints are produced without application of heat, but by applying pressure which results diffusion or inter-surface molecular fusion of the parts to be joined. It is also known as solid state welding process. This process is mainly used for welding nonferrous sheet metal, particularly aluminum and its alloys. This includes ultrasonic welding, friction welding, Explosive welding etc. 4 Main Welding Processes: 1. Arc Welding (Fusion Welding): In this type of welding process, weld metal melted from the edges to be joined and allow to solidifies from the liquid state and usually below the recrystallization temperature without any applied deformation. Arc welding is most extensively employed method of joining metal parts by fusion. In this welding the arc column is generated between an anode, which is the positive pole of power supply, and the cathode, the negative pole. When these two conductors of an electric circuit are brought together and separated for a small distance such that the current continues to flow through a path of ionized particles called plasma, an electric arc is formed. This ionized gas column acts as a high resistance conductor that enables more ions to flow from the anode to the cathode. Heat is generated as the ions strike the cathode. This heat used as melting of metal to be joined or melting the filler metal which further used as joining material of welding metal. The electrode is either consumable or non-consumable as per welding requirement. The temperature at the center of the arc being 6000 OC to 7000OC 2. Gas Welding: The gas welding is done by burning of combustible gas with air or oxygen in a concentrated flame of high temperature. As with other welding methods, the purpose of the flame is to heat and melt the parent metal and filler rod of a joint. It can weld most common materials 3. Gas Metal arc welding (MIG): This welding is also known as metal inert gas welding. In this type of welding a metal rod is used as one electrode, while the work being welded is used as another electrode. It is a gas shielded metal arc welding which uses the high heat of an electric arc between a continuously fed, consumable electrode wire and the material to be welded. Metal is transferred through protected arc column to the work. In this process the wire is fed continuously from a reel through a gun to constant surface imparts a current upon the wire. In this welding the welding area is flooded with a gas which will not combine with the metal. The rate of flow gas is sufficient to keep the oxygen of the air away from the hot metal surface while welding is being done. 4. Gas Tungsten Arc Welding (TIG): This welding is also known as tungsten inert gas welding is similar to the MIG in that is uses the gases for shielding. This arc welding process uses the intense heat of an electric arc between a no consumable tungsten electrode and the material to be welded. In this process the electrode is not consumable during welding process and gas is used to protect the weld area form atmospheric air.
Difference between Hot Working and Cold Working
They both are the metal forming processes. When plastic deformation of metal is carried out at temperature above the recrystallization temperature the process, the process is known as hot working. If this deformation is done below the recrystallization temperature the process is known as cold working. There are many other differences between these processes which are described as below. Difference between Hot Working and Cold Working: S.No. Cold working Hot working 1 It is done at a temperature below the recrystallization temperature. Hot working is done at a temperature above recrystallization temperature. 2. It is done below recrystallization temperature so it is accomplished by strain hardening. Hardening due to plastic deformation is completely eliminated. 3. Cold working decreases mechanical properties of metal like elongation, reduction of area and impact values. It increases mechanical properties. 4. Crystallization does not take place. Crystallization takes place. 5. Material is not uniform after this working. Material is uniform thought. 6. There is more risk of cracks. There is less risk of cracks. 7. Cold working increases ultimate tensile strength, yield point hardness and fatigue strength but decreases resistance to corrosion. In hot working, ultimate tensile strength, yield point, corrosion resistance are unaffected. 8. Internal and residual stresses are produced. Internal and residual stresses are not produced. 9.
Cold working required more energy for plastic deformation.
It requires less energy for plastic deformation because at higher temperature metal become more ductile and soft. 10.
More stress is required.
Less stress required. 11.
It does not require pickling because no oxidation of metal takes place.
Heavy oxidation occurs during hot working so pickling is required to remove oxide. 12.
Embrittlement does not occur in cold working due to no reaction with oxygen at lower temperature.
There is chance of embrittlement by oxygen in hot working hence metal working is done at inert atmosphere for reactive metals.
CLASSIFICATION OF FLUIDS
Ideal fluid: A fluid, which is incompressible and having no viscosity, is known as an ideal fluid. Ideal fluid is only an imaginary fluid as all the fluids, which exist, have some viscosity. Real fluid: A fluid, which possesses viscosity, is known as real fluid. All the fluids, in actual practice, are real fluids. Example : Water, Air etc. Newtonian fluid: A real fluid, in which shear stress in directly proportional to the rate of shear strain or velocity gradient, is known as a Newtonian fluid. Example : Water, Benzine etc. Non Newtonian fluid: A real fluid, in which shear stress in not directly proportional to the rate of shear strain or velocity gradient, is known as a Non Newtonian fluid. Example : Plaster, Slurries, Pastes etc. Ideal plastic fluid: A fluid, in which shear stress is more than the yield value and shear stress is proportional to the rate of shear strain or velocity gradient, is known as ideal plastic fluid. Incompressible fluid: A fluid, in which the density of fluid does not change which change in external force or pressure, is known as incompressible fluid. All liquid are considered in this category. Compressible fluid: A fluid, in which the density of fluid changes while change in external force or pressure, is known as compressible fluid. All gases are considered in this category. Graphical representation of different fluids: Tabular representation of fluid types: Types of fluid Density Viscosity Ideal fluid Constant Zero Real fluid Variable Non zero Newtonian fluid Constant/ Variable T = u(du/dy) Non Newtonian fluid Constant/ Variable T ≠ u(du/dy) Incompressible fluid Constant Non zero/zero Compressible fluid Variable Non zero/zero CLASSIFICATION OF FLOWS ON THE BASIS OF MACH NUMBER. Incompressible flow-M less than 0.3 Compressible subsonic flow-M between 0.3 and 1 Transonic flow-M ranging between values less than 1 and more than 1 Supersonic flow-M greater than 1 but less than 5 Hypersonic flow - M greater than 5
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Best Place To Find a High Quality Hydraulic Equipments fron Isha Engineering & Co
Isha Engineering & Co posted a blog entry in Hydraulic Equipment Manufacturers
We are authorized Hydraulic Scissor Lifts manufacturer and Supplier’s registered by the Govt. of India. It is our corporate commitment to achieve overall customer satisfaction that motivates us to maintain consistent quality as well as ensure competitive pricing. Over the years, we have successfully won the allegiance, trust, and support of our wide customer base. Our prestigious clients include TNPL, ITC, LGB, ION Exchange, HAL, Vedanta, BGR Energy, amongst others. Our scissor lifts are moveable scissor lift, floor mounted scissor lift, Pit Mounted scissor lift, material handling, truck mounted, aerial work platform, trolley lift, high rise scissor lift, heavy duty, Low Closed scissor lift and many more., We have designed huge models which are Excellent in Quality With high performance Durable Flawless in function Long service life Customized model as per the requirements Features: We offer our clients a wide range of Manual Operated Scissor Lift and self Propelled scissor lifts that have exceptional load-bearing capacity, ranging from a min kgs to max of kgs. Safe for lifting various equipment and material to the required heights, these Scissor Lift Tables are offered at the most economical prices to our clients. Available options: In single scissor or multi scissor configurations to provide the load capacity, lifting height and platform size to suit the specific application Available Options: manual, diesel, electric operated & battery operated. These Lift tables are designed in view the space availability in the shop floor. Excellent after sale service and parts are available over the market. Note: Color & specifications can be made according to the user needs. Features and Options: Safety bellows Very compact design Foot pump / hand pump provided Used at any intermittent height Limit switch for auto shut off Hose burst valve provided at the cylinder end Hydraulic pump with built in overload relief Platform surface is made up of anti-skid checkered steel plate Mechanical lock Manual emergency lowering system Pendant box Caster wheels / nylon wheels / rubber wheels / non-marking tyres provided Stabilizing hydraulic cylinder provided Stabilizing screw jack provide Auto close door provided on top platform Work light mounted on top platform Manual hydraulic hand pump provided on base frame More info.,https://www.ishaengineering.com/products/scissor-lift-161 -
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Electronic water pumps in Feilong
Erica Zhu Feilong Jiangli posted a topic in Technology Focus & New Emerging Fields
http://autonews.gasgoo.com/china_news/70015383.html Lincoln's first China-made model will be an all-new SUV model and the mass-produced Aviator, which is set to be unveiled at the 2018 LA Auto Show later this month, will be introduced by Changan Ford and hit the market at the end of 2019. To meet Chinese consumers’ demands, the automaker will make the locally-produced models adjusted in exterior, interior and powertrains. The annual output of chongqing feilong pump is 2 million, and the annual output of oil level is 1.6 million.It is expected to realize multiple power production of electronic pump in 2020. -
What is critical temperature of refrigerant ?
balasubbiramani shrihari commented on saurabhjain's blog entry in Mechanical Engineering Questions
The critical temperature of arefrigerant is the temperature above which a refrigerant gas (vapour) cannot be liquefied, irrespective of pressure. This process normally takes place in the condenser. ... Therefrigerant moves along the closedrefrigeration system as a liquid to continue the cycle. - Yesterday
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How do I design a sluice valve using IS 14846:2000 for 10 inch diameter?
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Early damage of turbocharger caused by improper operation
Erica Zhu Feilong Jiangli posted a topic in General Talks
The service life of turbochargers on automobiles should be more than 150,000 kilometers if they are properly used and maintained. However, due to the improper operation of some drivers and maintenance personnel irregular maintenance: it will cause unnecessary damage to the turbocharger, so as to shorten its service life. Modern cars can start without preheating after starting, but engines with turbochargers must idle for a few minutes before starting. If the engine starts as soon as it is started, the turbocharger rotor bearing will not be fully lubricated before high-speed operation, resulting in the early damage of the rotor floating bearing. Increasing the throttle load immediately after starting will accelerate the wear and tear between the rotor shaft and the floating bearing because of the oil-free lubrication of the supercharger bearing, and even jam. The engine suddenly stalls at high speed, while the rotor in the turbocharger is still spinning at high speed due to inertia, which will cause the floating bearings to be worn out or even ablated due to high temperature and lack of lubrication. The engine with turbocharger can not run idle for a long time. Because when the engine is idling for a long time, there is negative pressure behind the turbocharger turbine and the compressor impeller. Under the pressure difference, the oil from the floating bearing will leak out. This is also one of the reasons why the turbocharger engine often has less oil. -
Fatigue of automobile parts
Erica Zhu Feilong Jiangli posted a topic in Technology Focus & New Emerging Fields
Fatigue fracture is a kind of fracture that occurs after a long period of work under the action of alternating stress. Fatigue fracture is one of the common failure forms of automobile parts, and it is also one of the most harmful failure forms. According to the characteristics of parts and the total number of stress cycles, fatigue failure can be divided into: crack-free parts of the fatigue fracture failure and crack parts of the fatigue fracture failure. For different types of fatigue failure, the analysis methods are different: when high cycle fatigue occurs, the yield strength should be below, and the life of the parts is mainly controlled by the crack nucleation life. The stress of low cycle fatigue is higher than that of yield strength, and its life is greatly influenced by the crack propagation life. Generally, automobile parts are low stress and high cycle fatigue fracture. Fatigue fracture failure mechanism: Fatigue fracture of metal parts is essentially a cumulative damage process, which can be divided into slip, crack nucleation, emblem crack propagation, macroscopic crack propagation and final fracture. Methods to improve fatigue fracture resistance of automotive parts: 1) Delay the initiation time of fatigue crack: strengthen the surface of metal alloy, such as surface rolling, shot peening and surface heat treatment. Grain refinement can improve the fatigue strength limit; heat treatment can prevent grain boundaries from becoming fatigue crack propagation channels; improve the purity of metal materials, reduce the size of inclusions; improve the surface integrity of parts design level, as far as possible to avoid the phenomenon of stress concentration. 2) Reduce the rate of fatigue crack growth: the main methods are: crack arrest method: that is, drilling holes in the front of crack growth to prevent crack growth; reaming method: that is, without affecting the strength of the premise, using reaming method to increase the diameter of fatigue crack, fatigue crack will be removed; scraping repair method: that is, using scraping method: Remove the cracks on the part surface. 3) Increasing the threshold length of fatigue crack: The threshold value of crack growth of metal parts is the maximum stress intensity factor amplitude of non-propagation (stability) of fatigue crack. Its value is usually determined directly by experiments. Chongqing Feilong——water pumps,oil dipsticks,rubber parts and electronic water pumps. -
I'm a 14 year old 9th grader, who was pushed back one grade in math from the USA average, which lands me in an entire other year of Pre-Algerba while all my friends are in Algerba 2 (My school has relatively high standards). I am looking to become a mechanical engineer but I'm afraid I won't be capable from my math skills and stance at the moment. I have a 89.50% average in Pre-Algerba incase that will be important later. My GPA is currently 3.75 if it's not weighted and taken straight from all of my class averages. Can I become an engineer and/or learn the required mathematics, physics, and other subjects required to become what I want to be? I'm planning on going to the University of Arkansas when I graduate high school and taking classes to get a masters degree in mechanical engineering . Thanks.
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Adhesive wear of automotive parts
Erica Zhu Feilong Jiangli posted a topic in Technology Focus & New Emerging Fields
The phenomenon of loss of metal in the relative movement of parts is known as the wear of parts. The occurrence of wear will cause changes in the shape, size and surface properties of the parts, which will gradually reduce the working performance of the parts. Wear is sometimes beneficial, such as running-in. According to different friction principles, wear can be divided into abrasive wear, adhesive wear, fatigue wear and corrosion wear. Then, what is adhesive wear? When the oil film on the metal surface is destroyed, the friction surface is directly contacted with each other, and adhesive wear occurs, which causes the metal on one part surface to transfer to another part surface. It is mainly caused by heavy metal surface and high temperature. Factors affecting adhesive wear: The influence of material properties. Brittle materials are better than plastic materials, and the surface roughness of parts is affected. The higher the smoothness, the smaller the wear volume; the effect of lubricating oil. To ensure sufficient lubricating oil, and to ensure that the viscosity of lubricating oil and working temperature, the surface of the parts of the oxide film is not easy to be destroyed; the impact of movement speed and unit area pressure. The higher the speed of the parts and the greater the load, the easier the adhesive wear is. Chongqing Feilong has a professional R & D team.Welcome to our factory. -
Mechanical Interview Questions and Answers 2018 || Topics: Boiler Exceptional Question
For the job placement in the mechanical engineering private companies, it is very necessary to know about the very important mechanical engineering interview questions and answers. During the interview session, the employer can ask you the mechanical engineering basic questions to examine your knowledge about your subject and sector. If you planning to seat in the job placement, these frequently asked mechanical engineering questions and answers will help you in reply to the employer questions. These mechanical engineering interview questions and answers are meant for the purpose of a job interview and getting an idea of interview question for fresher.
Today we are going to discuss Mechanical Interview Questions and Answers-Topics: Boiler
In this video we discuss the following question with answer:
Question Number 1. What is boiler?
Question Number 2: What are the boiler mountings?
Question Number 3. What are boiler accessories?
Question Number 4. What is circulation ratio of a boiler?
Question Number 5. What is turn down ratio of boiler?
Question Number 6. What is foaming of boiler?
Question Number 7. What is priming of boiler?
Question Number 8. What is critical point of steam?
Question Number 9. What is evaporation ratio of Boiler?
Question Number 10. What is acid due point in boiler?
Question Number 11. What is gross calorific value and net calorific value of coal?
You will all answer after see this video: https://youtu.be/ANifcZlS9Mg
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Mechanical Interview Questions and Answers 2018 Topics: Boiler Exceptional Question
Engr Anik posted a blog entry in Mechanical Interview Question & Answer
For the job placement in the mechanical engineering private companies, it is very necessary to know about the very important mechanical engineering interview questions and answers. During the interview session, the employer can ask you the mechanical engineering basic questions to examine your knowledge about your subject and sector. If you planning to seat in the job placement, these frequently asked mechanical engineering questions and answers will help you in reply to the employer questions. These mechanical engineering interview questions and answers are meant for the purpose of a job interview and getting an idea of interview question for fresher. Today we are going to discuss Mechanical Interview Questions and Answers-Topics: Boiler In this video we discuss the following question with answer: Question Number 1. What is boiler? Question Number 2: What are the boiler mountings? Question Number 3. What are boiler accessories? Question Number 4. What is circulation ratio of a boiler? Question Number 5. What is turn down ratio of boiler? Question Number 6. What is foaming of boiler? Question Number 7. What is priming of boiler? Question Number 8. What is critical point of steam? Question Number 9. What is evaporation ratio of Boiler? Question Number 10. What is acid due point in boiler? Question Number 11. What is gross calorific value and net calorific value of coal? You will all answer after see this video: https://youtu.be/ANifcZlS9Mg -
Top 12 Basic Common Questions Asked in Mechanical Engineering Interview 2018
Engr Anik posted a blog entry in Mechanical Interview Question & Answer
For the placement in the mechanical engineering companies, it is very necessary to know about the important mechanical engineering interview questions and answers. During the interview, the interviewer can ask you the mechanical engineering technical questions to examine your knowledge about your subject and field. If you planning to seat in the placement, these frequently asked mechanical engineering questions and answers will help you in reply to the interviewer’s questions. These mechanical engineering interview questions and answers are meant for the purpose of a job interview and getting an idea of interview question. Today we are going to discuss top 12 Basic Common Questions Asked in Mechanical Engineering Interview session. Basically this video is helpful for fresh mechanical graduate engineer to help him how to answer common mechanical question that has been asked in interview. A mechanical fresh student gain knowledge about top 12 common mechanical questions. It also helps for fresher mechanical student to take preparation for facing interview. Here we listed some mechanical basic common questions and answer that has been asked in the video: Question Number 1: what is heat treatment and why is it done? Answer: Heat treatment can be defined as a combination of processes or operations in which the heating and cooling of a metal or alloy is done in order to obtain desirable characteristics without changing the compositions. Some of the motives or purpose of heat treatment are as follows: In order to improve the hardness of metals. For the softening of the metal. In order to improve the mach inability of the metal. To change the grain size. To provide better resistance to heat, corrosion, wear etc. Question Number 2: Why do heavy vehicles use diesel engine? Answer: The compression ratio of diesel engine is higher than the petrol engine, the reason for producing higher torque. The efficiency of diesel engine increases with load. Diesel produces slow energy on burning of fuel and the efficiency of the engine increases with load which is why diesel engine is suitable and largely used for heavy vehicles Question Number 3: what are types of heat treatment? Answer: Heat treatment is generally performed in the following ways: Normalizing Annealing Spheroidising Please watch this video till end to get the full questions with answer. Here is the link: -
Basically this video is helpful for fresh mechanical graduate engineer to help him how to answer common mechanical question that has been asked in interview. A mechanical fresh student gain knowledge about top 12 common mechanical questions. It also helps for fresher mechanical student to take preparation for facing interview.
Here we listed some mechanical basic common questions and answer that has been asked in the video:
Question Number 1: what is heat treatment and why is it done?
Answer: Heat treatment can be defined as a combination of processes or operations in which the heating and cooling of a metal or alloy is done in order to obtain desirable characteristics without changing the compositions. Some of the motives or purpose of heat treatment are as follows:
In order to improve the hardness of metals.
For the softening of the metal.
In order to improve the mach inability of the metal.
To change the grain size.
To provide better resistance to heat, corrosion, wear etc.
Question Number 2: Why do heavy vehicles use diesel engine?
Answer: The compression ratio of diesel engine is higher than the petrol engine, the reason for producing higher torque. The efficiency of diesel engine increases with load. Diesel produces slow energy on burning of fuel and the efficiency of the engine increases with load which is why diesel engine is suitable and largely used for heavy vehicles
Question Number 3: what are types of heat treatment?
Answer: Heat treatment is generally performed in the following ways:
Normalizing
Annealing
Spheroidising
Please watch this video till end to get the full questions with answer.
Here is the link:
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Top 12 Basic Common Questions Asked in Mechanical Engineering Interview 2018
Engr Anik posted a video in Animations & Explanations
Top 12 Basic Common Questions Asked in Mechanical Engineering Interview 2018 https://youtu.be/AQC2FYSfK8g - Earlier
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Mechanical Engineering Quiz 10 -
mechanical design tutor needed, any help?
DrD replied to IE Mostafa's topic in Machine Dynamics & Design Considerations
It is possible that I may be able to help you, but again, I may not. Please answer a few questions for me. 1) What college level math courses have you taken? 2) What college level mechanics courses have you taken (statics, dynamics, vibrations, theory of machines, etc)? 3) Where are you located? 4) Are you able to pay for tutoring? DrD -
mechanical design tutor needed, any help?
IE Mostafa posted a topic in Machine Dynamics & Design Considerations
hello all i am an industrial engineer, currently enrolled in masters program. the problem is i have to enroll in courses that i have no background in, this semester i am enrolled in mechanical system design course. the prof relies on the student's knowledge to understand the basic stress and strength formula for any component like spur gears, journal bearings, shafts and the whole realm of elements, i do not have this background i need someone to tutor me in this subject, any help? -
Hi everyone! I have a problem and I hope somebody can help me. A biomass-fired power plant needs a mechanical sampling system and they want to integral the auger, sample divider and sample crusher in one device. I found out that Johnson Industries offers an auger sampling system for sampling coal, but it contains a small, horizontal shaft hammer mill and it is not good for crushing high water content and high viscosity biomass. They need an auger sampling system with a vertical shaft hammer mill (0,5 meters rotor diameter and 3300 RPM motor). Also, they need an integral sample divider (2:1 ratio) to divide the extracted material before crushing. A simple drawing would help me a lot if you know how to integral a vertical shaft hammer mill and a 2:1 ratio sample divider. It is just a university assignment!
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I wanted to know how fatigue life for polymer composites is determined? Is it using creep analysis or by any other method. Thank you.
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Kabilan Kamaraj reacted to a reply to a status update:
Hello friends, May i know wheather TIG welding require Filler Material? if yes or if
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What is the difference between a workshop gauge and an inspection gauge, with respect to its tolerance limits?
Dr abdou abdallah commented on umama's blog entry in Mechanical Engineering Questions
The tolerance in inspection gauge is less than that in workshop gauge. i.e it is more accurate -
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What are the different Types of allowances in Casting process?
mechanicalstudents commented on admin's blog entry in Mechanical Engineering Questions
Hello, 5 Types of Allowances in Casting Process You Must Know are as follows. 1.Shrinkage Allowance 2.Machining Allowance 3.Draft Allowance 4.Distortion Allowance 5.Shake Allowance. I have written a brief article on the different types of allowances and if you want to know,just click the below link. https://mechanicalstudents.com/types-of-allowances/ Regards, mechanicalstudents.com -
Hi Osman Since you are in final year I assume you know heating, ventilation and air conditioning field inside out. Rather than asking other people for project ideas best thing to do would be ( in my mind) to identify common issues, next technology leap etc by some common research. Search for common issues these units are having to identify a a problem Talk to few suppliers, industrial end users, installing agents etc to identify a common problems Visit unit manufacturers website and read their white papers to identify what they are looking at for the next generation technology leap so on... This way you will find a niche idea or issue to research and do your project. This also will help you to be at the forefront of what the current technology trend. In case if you are successful at solving an issue to come up with a new idea you could start a business providing a solution. good luck Prakash Engineering Product Design
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Introduction to operation management
abhijeet chandak replied to saurabhjain's topic in Operation Managment : Industrial Engineering
The goal of operations management is to maximize efficiency while producing goods and services that effectively fulfill customer needs. Operations is one of the three strategic functions of any organization. -
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MULTIPULLEY BELT FORCES
Kevin Smith replied to Gabriel Menoncin Kracker's question in Question & Answers
If a idler pulley is necessary, there are rules as to the diameter that should be used so as not the "break the back" of the belt, I assume you are talking v-belts. Then when tensioning the drive belts your need to apply about a 1% stretch to the cords in the belt, assumption is std belts with polyester cords. If you are thinking to firstly correctly tension the belts, then apply an idler, the whole drive could be over tensioned and damage the shaft and bearings. You have to tension the drive the same as you would with the idler in the system, Both Carlisle Belts and Gates have very good drive design programs for designing and provide tensioning information. This is not a simple procedure and the larger the drive the bigger the loads, also life and efficiency are very important.- 1 reply
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Mechanical Interview Questions and Answers 2018 || Topics: Boiler Exceptional Question· 0 replies
For the job placement in the mechanical engineering private companies, it is very necessary to know about the very important mechanical engineering interview questions and answers. During the interview session, the employer can ask you the mechanical engineering basic questions to examine your knowledge about your subject and sector. If you planning to seat in the job placement, these frequently asked mechanical engineering questions and answers will help you in reply to the employer questions. These mechanical engineering interview questions and answers are meant for the purpose of a job interview and getting an idea of interview question for fresher.
Today we are going to discuss Mechanical Interview Questions and Answers-Topics: Boiler
In this video we discuss the following question with answer:
Question Number 1. What is boiler?
Question Number 2: What are the boiler mountings?
Question Number 3. What are boiler accessories?
Question Number 4. What is circulation ratio of a boiler?
Question Number 5. What is turn down ratio of boiler?
Question Number 6. What is foaming of boiler?
Question Number 7. What is priming of boiler?
Question Number 8. What is critical point of steam?
Question Number 9. What is evaporation ratio of Boiler?
Question Number 10. What is acid due point in boiler?
Question Number 11. What is gross calorific value and net calorific value of coal?
You will all answer after see this video: https://youtu.be/ANifcZlS9Mg
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Basically this video is helpful for fresh mechanical graduate engineer to help him how to answer common mechanical question that has been asked in interview. A mechanical fresh student gain knowledge about top 12 common mechanical questions. It also helps for fresher mechanical student to take preparation for facing interview.· 0 replies
Here we listed some mechanical basic common questions and answer that has been asked in the video:
Question Number 1: what is heat treatment and why is it done?
Answer: Heat treatment can be defined as a combination of processes or operations in which the heating and cooling of a metal or alloy is done in order to obtain desirable characteristics without changing the compositions. Some of the motives or purpose of heat treatment are as follows:
In order to improve the hardness of metals.
For the softening of the metal.
In order to improve the mach inability of the metal.
To change the grain size.
To provide better resistance to heat, corrosion, wear etc.
Question Number 2: Why do heavy vehicles use diesel engine?
Answer: The compression ratio of diesel engine is higher than the petrol engine, the reason for producing higher torque. The efficiency of diesel engine increases with load. Diesel produces slow energy on burning of fuel and the efficiency of the engine increases with load which is why diesel engine is suitable and largely used for heavy vehicles
Question Number 3: what are types of heat treatment?
Answer: Heat treatment is generally performed in the following ways:
Normalizing
Annealing
Spheroidising
Please watch this video till end to get the full questions with answer.
Here is the link:
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Dear Mechanical Engineers!· 1 reply
I have come across some aptitude tests and I really need your help big time and ASAP. I answered myself but I found them quite challenging and , please lend me a hand!!
Thank you!!!
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I will be respected global entreneur, throug the power of Positive Action.· 0 replies
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By Erica Zhu Feilong Jiangli · Posted
http://autonews.gasgoo.com/china_news/70015383.html Lincoln's first China-made model will be an all-new SUV model and the mass-produced Aviator, which is set to be unveiled at the 2018 LA Auto Show later this month, will be introduced by Changan Ford and hit the market at the end of 2019. To meet Chinese consumers’ demands, the automaker will make the locally-produced models adjusted in exterior, interior and powertrains. The annual output of chongqing feilong pump is 2 million, and the annual output of oil level is 1.6 million.It is expected to realize multiple power production of electronic pump in 2020. -
By manoj chavan · Posted
How do I design a sluice valve using IS 14846:2000 for 10 inch diameter? -
By Erica Zhu Feilong Jiangli · Posted
The service life of turbochargers on automobiles should be more than 150,000 kilometers if they are properly used and maintained. However, due to the improper operation of some drivers and maintenance personnel irregular maintenance: it will cause unnecessary damage to the turbocharger, so as to shorten its service life. Modern cars can start without preheating after starting, but engines with turbochargers must idle for a few minutes before starting. If the engine starts as soon as it is started, the turbocharger rotor bearing will not be fully lubricated before high-speed operation, resulting in the early damage of the rotor floating bearing. Increasing the throttle load immediately after starting will accelerate the wear and tear between the rotor shaft and the floating bearing because of the oil-free lubrication of the supercharger bearing, and even jam. The engine suddenly stalls at high speed, while the rotor in the turbocharger is still spinning at high speed due to inertia, which will cause the floating bearings to be worn out or even ablated due to high temperature and lack of lubrication. The engine with turbocharger can not run idle for a long time. Because when the engine is idling for a long time, there is negative pressure behind the turbocharger turbine and the compressor impeller. Under the pressure difference, the oil from the floating bearing will leak out. This is also one of the reasons why the turbocharger engine often has less oil. -
By Erica Zhu Feilong Jiangli · Posted
Fatigue fracture is a kind of fracture that occurs after a long period of work under the action of alternating stress. Fatigue fracture is one of the common failure forms of automobile parts, and it is also one of the most harmful failure forms. According to the characteristics of parts and the total number of stress cycles, fatigue failure can be divided into: crack-free parts of the fatigue fracture failure and crack parts of the fatigue fracture failure. For different types of fatigue failure, the analysis methods are different: when high cycle fatigue occurs, the yield strength should be below, and the life of the parts is mainly controlled by the crack nucleation life. The stress of low cycle fatigue is higher than that of yield strength, and its life is greatly influenced by the crack propagation life. Generally, automobile parts are low stress and high cycle fatigue fracture. Fatigue fracture failure mechanism: Fatigue fracture of metal parts is essentially a cumulative damage process, which can be divided into slip, crack nucleation, emblem crack propagation, macroscopic crack propagation and final fracture. Methods to improve fatigue fracture resistance of automotive parts: 1) Delay the initiation time of fatigue crack: strengthen the surface of metal alloy, such as surface rolling, shot peening and surface heat treatment. Grain refinement can improve the fatigue strength limit; heat treatment can prevent grain boundaries from becoming fatigue crack propagation channels; improve the purity of metal materials, reduce the size of inclusions; improve the surface integrity of parts design level, as far as possible to avoid the phenomenon of stress concentration. 2) Reduce the rate of fatigue crack growth: the main methods are: crack arrest method: that is, drilling holes in the front of crack growth to prevent crack growth; reaming method: that is, without affecting the strength of the premise, using reaming method to increase the diameter of fatigue crack, fatigue crack will be removed; scraping repair method: that is, using scraping method: Remove the cracks on the part surface. 3) Increasing the threshold length of fatigue crack: The threshold value of crack growth of metal parts is the maximum stress intensity factor amplitude of non-propagation (stability) of fatigue crack. Its value is usually determined directly by experiments. Chongqing Feilong——water pumps,oil dipsticks,rubber parts and electronic water pumps. -
I'm a 14 year old 9th grader, who was pushed back one grade in math from the USA average, which lands me in an entire other year of Pre-Algerba while all my friends are in Algerba 2 (My school has relatively high standards). I am looking to become a mechanical engineer but I'm afraid I won't be capable from my math skills and stance at the moment. I have a 89.50% average in Pre-Algerba incase that will be important later. My GPA is currently 3.75 if it's not weighted and taken straight from all of my class averages. Can I become an engineer and/or learn the required mathematics, physics, and other subjects required to become what I want to be? I'm planning on going to the University of Arkansas when I graduate high school and taking classes to get a masters degree in mechanical engineering . Thanks.
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