mechanical engineering technical interview

Tell me about your ability to work under pressure? Which refrigerant is used for ice plant and transport refrigeration ? We often come across use of jet pumps in process industry ? Answer: It remains constant. How these are controlled ? 42. If you are aware of mechanical engineering basics, You can answer these questions. 98. Answer: Effectiveness of heat exchanger = actual heat transfer/maximum possible heat transfer. 95. Answer: As pressure is increased, the dryness fraction of steam lowers on isentropic expansion. What is the difference between fuel NOx and thermal NOx ? 10. What for water/steam is injected in combustion zones of a gas turbine ? (iii) Higher the turbine firing temperature, lower the heat rate. 17. What is the limit and reasons for same ? (i) Lower the gas turbine inlet temperature, lower the heat rate. 23. However, it is suggested that you should focus more on basic as well as advanced technical interview questions for mechanical engineer interview. 28. Out of circular, square, channel, I sections, which is most economical for a component subjected to bending ? Answer: Impurities in water are usually in finely divided state which takes long time to settle and these usually pass through the filtering media. (v) Exhaust gas flow, inlet pressure loss, exhaust pressure loss also affect heat rate. To slide a heavy block over a rough floor by a rope with minimum force by a man, at what angle the rope should be inclined with the level of floor ? What kind of nuclear fuel is used in Narora, Kalapakkam and Rana Pratap Sagar nuclear plants ? What do you think are the most important skills for a mechanical engineer to possess? Natural uranium contains only 0.7% U25 which is capable of switching chain nuclear reaction. 16. Interview questions discussed here are from the engineering curriculum. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos. What is boundary layer thickness in turbulent boundary layer ? Which parameters influence the performance of gas turbines ? What was your very first design?’ By asking interviewees to provide a verbal sample of their early … What do you understand by microbial desulphurisation ? Its drawback is sophisticated design and appreciable length due to large number of stages, narrow operating range for good efficiency, higher weight and cost, high starting power. What is the frequency of secondary imbalance in four-stroke engine ? What causes rotation of steam turbine rotor ? —Increased fuel consumption 20. When its mechanical efficiency will be maximum ? 15. address: The Black Church, St. Mary’s Place, Dublin 7, Ireland. Answer: ISO conditions for GT performance are : Ambient dry bulb temperature : 15°C, Relative humidity – 60%. Answer: Ammonia and CO2 respectively. Answer: Speed. Mechanical Engineering Interview Questions With Answers – HR & Technical Basic Mechanical Questions – Mechanical engineering deals with all things that are used to convert one form of energy into another, when put in layman terms. Pyrheliometer is used to measure beam intensity by collimating the radiation. This is perhaps one of the hardest interview questions to answer, as it involves a need to provide your interviewer with an example of a time when your work was less than satisfactory. And when pursuing a career such as mechanical engineering — a job that requires immense skill, experience and precision — the endeavour may appear even more daunting. What is the reason for this ? Axial flow compressor is more popular due to high delivery capacity, high compression ratio due to many stages, high efficiency (85-90%), low cross sectional area. Answer: When the shear stress is direcly proportional to velocity gradient. 18. Why the vane passages are gradually increased in size in successive wheels in steam turbine ? Answer: Independent of wavelength. Instead of offering a response such as this, make some adjustments. Answer: It is the ratio of heat change from feed water to steam and the heat of vaporization of steam at atmospheric pressure. (This will likely change in the near future, however, with artificial intelligence making inroads also in this market. Answer: Fast breeder reactor. Some of the best mechanical engineers have been creating things their entire lives. Answer: Burn up corresponds to destruction of fissionable material when it undergoes nuclear fission. Karna Lad 12-9-2019 10:39 PM Mechanical REALLY HELPFUL chetia 07-26-2017 05:35 AM mechanical engineering aptitude questions and answers give me some important test questions asked in aptitude exam vivek mangaluru 07-13-2017 12:07 PM When answering a supposition such as this, you have the opportunity to discuss the methods in which you self-motivate, encourage those on your team and think innovatively about the tasks that you are completing. Answer: When sum of the resolved parts in any two perpendicular directions is zero. What arrangement is preferred ? If pinch point is lower, total heat recovered in HRSG in higher and steam generation is also high. A Carnot cycle is to be designed to attain efficiency of 0.75. Luckily for you, right now we experience a deficit of mechanical engineers, and companies literally fight for skilled job candidates. 7. 69. 44. How the characteristics of fuel like front end volatility, mid-range volatility and tail end volatility affect S.I. 99. Answer: Water/steam injection is not allowed beyond 5% of compressor flow to avoid flame out in combustion and to minimise operating cost and impact on inspection intervals. What is the name given to combined process of cooling and humidifying ? When coluomb friction comes into existence between two surfaces ? What would be the approximate air fuel ratio at time of cold start, part load operation, full load, and idling ? What is the difference between pyrometer, pyranometer and pyrheliometer. What do you like about teamwork? Answer: For regenerative cycle which approaches Carnot cycle. Answer: Fuel NO* is formed by the gas phase oxidation of char nitrogen (CN~ compounds) in the fuel and thermal NO* is formed by high temperature reaction between the nitrogen and oxygen in the combustion air. In fully turbulent it may extend 5-10% of radius only whereas in transition flow, boundary layer may be from 50-60% of radius of pipe. 97. Your email address will not be published. Steam injection increases power output and decreases heat rate because of its higher energy entering the combustion zone. What does the area under the stress-strain curve represent ? The main type are lean premixed combustors, rich/quench lean combustors and catalytic combustors. Its optimum value is 8-10°C. However, despite its popular use, many potential job candidates fail to answer the query adequately – indeed, many people tend to reply with ‘Working here, in the position that I’m applying for’. If a nuclear reactor generates more fuel that it consumes, it is called ______ ? Mechanical Engineers are responsible for all stages of a mechanical device's production cycle, from research and design, to manufacture and evaluation. What is the nature of curve in case of transfer of heat by conduction through a cylindrical wall and through a spherical wall ? What is gear ratio? Answer: Ambient conditions, inlet/exhaust pressure losses, fuels, and water/steam injection flow rates’influence the performance of gas turbines. Answer: Excess air is required to ensure adequate mixing of fuel and air, avoid smoke, minimize slagging in coal burning, and to ensure maximum steam output. Answer: —Increased CO at lower loads Interview,Mechanical Interview Questions,Interview question and answers,Interview questions,Interview preparation,Interview puzzles ... Technical Interview Questions. 62. 50. Answer: Rateau and Curtis respectively. The first law, a version of the law of conservation of energy, proclaims that energy is neither created nor destroyed. Which cycle is used in vapour compression and gas cycle refrigerantion system ? Answer: In laminar flow, boundary layer extends right from surface upto centre. Currently, he is working in the sheet metal industry as a designer. 74. In this post, you can reference some of the most common interview questions for a mechanical technician interview along with appropriate answer samples. In one design combustion chamber is designed into a series of small, lean premixed chambers. When answering this question, be sure to tell a clear and concise story, ensuring that you do not become side-tracked. Drawback is larger cross-section area for same capacity and its unsuitability for high pressure ratios. 2. Answer: It will decrease. Be sure to recap the personality skills that would make you a key asset to the team you would be working with — factors such as strong teamworking abilities, easily taking direction while also being able to offer your own insights, and the desire to take on personal responsibility. What is radiosity ? Further improvement is possible by heating make up water/condensate in HRSG, generating low pressure saturated steam or dearation steam in HRSG using a low pressure evaporator, preheating the make up water in a heat exchanger before it enters deaerator, and circulate more water than necessary through the economiser and recirculate excess to the deaerator. What is the latent heat of evaporation at critical point ? Indeed, by the end of this article, you’ll hopefully know what to say when answering some of the most common questions that are likely to come up in a mechanical engineer interview – and, as a result, bag the job of your dreams. Answer: Overall heat transfer coefficient can be increased by increasing velocity of water in tube. 67. 3. Answer: When there is relative motion between them. 38. Answer: It will be maximum when vehicle speed approaches the relative velocity of gases at nozzle exit. Mechanical Engineering this answer is very nice. Pyranometer is used to measure total hemispherical solar radiation. this questions are use to all engg students you did great job sir.please send me pdf format to my mail. There are a variety of answers you may receive. If temperature of When interviewing in the tech industry, expect to be asked questions about your training and certifications, as well as behavioral questions, situational questions, questions about your knowledge of tech tools and design, and questions about your work habits and processes. 47. 78. Answer: Percentage of U25 in natural uranium is increased by a process called uranium enrichment. Additionally, he has interested in Product Design, Animation, and Project design. Answer: 4 stroke CI engine has highest brake thermal efficiency followed by 4 stroke SI engine and the 2 stroke SI has lowest brake thermal efficiency. Answer: In ease of turbulent boundary layer, boundary layer thickness is defined as the distance from solid surface at which the fluid velocity is 99% of the undisturbed free stream velocity. Therefore, steam has to be reheated after partial expansion so that dryness fraction remains within limits after expansion. The second law states that the entropy of any sequestered system can only increase yet will never decrease. Answer: V2O5 supported by titanium or a mixture of titanium and silica is generally used as catalyst. Answer: Centrifugal compressors have following advantages : Following the typical opening interview questions, candidates can expect to be met with questions that delve deeper into their history and interest in mechanical engineering. Answer: Various parameters affecting heat rate of GT are : The reaction, of course, is slow and may take several days to several weeks to complete the reaction. 548227, reg. Consequently, interview questions such as these aim to separate quality workers from those that will not take their position as seriously as they should. How is dryness fraction of steam measured ? Answer tips You may say […] Answer: It refers to amount of unevaporated moisture in steam. 83. Both these vari¬ables affect the steam production and the cost and effectiveness of HRSG. 56. This process can achieve in excess of 90% NOx reduction. 1. 22. 61. An illustration of the latter reply could be a brief description of a childhood design you created – one that initiated your love of the field and fostered a desire to pursue a career in mechanical engineering as an adult. A steam pipe is to be insulated by two different insulating materials of same thickness. 9. What is the name given to useful part of available energy which is available for conversion to useful work ? Your new employer is going to invest a lot of time … 32. 37. Answer: Pyrometer measures temperature by radiation principle. Job Interviews Careers Engineering Electro-mechanical Technician. Answer: Diesel engine power plant. 31. (adsbygoogle = window.adsbygoogle || []).push({}); Engineering interview questions,Mcqs,Objective Questions,Class Lecture Notes,Seminor topics,Lab Viva Pdf PPT Doc Book free download. Answer: Water injection results in higher mass flow rate through turbine section and as rich electrical output is increased. Required fields are marked *. "When interviewing candidates for the role of mechanical engineer, employers look for candidates who are enthusiastic to create innovative designs, analyses, and methods of production for mechanical … 27. What catalyst is used in SCR process for control of NOx in gas turbines ? A heat engine and a refrigeration cycle operate between two temperature limits T1 and T2(T1 > T2). Answer: . 16 SpaceX Mechanical Engineer interview questions and 14 interview reviews. Do not worry if you tell other than the subject of company. 80. Interview questions discussed here are from the engineering curriculum. 81. Answer: NO* in gas turbines is controlled by (a) injecting water/steam into combustor, (6) using selective catalytic redaction (SCR) and non-catalytic reduction system (NRS), and (c) better combustor design. Answer: The velocity of steam decreases in successive stages and to accommodate same flow per unit time, the area of flow must increase. There’s no doubt about it: preparing for a job interview can be a stressful endeavour if you’re not adequately primed for the task. 73. Answer: Fertile materials, such as U28 and Th22. Answer: He should incline the rope with horizontal at angle of friction between floor and block. 55. In asking more technical questions such as these, an interviewer’s objective is to determine how much you know about the field you will be working in, should they decide to hire you. The list of technical mechanical engineering interview questions for freshers can run into thousands! 58. 96. Understandably, shallow and lacklustre responses such as ‘because it pays well’ or ‘because I need a job’ won’t get you hired. Answer: Diagram efficiency = Change in K.E./kg / Energy suppled/kg. 85. 17 Electro-mechanical Technician Interview Questions. What is the process which produces fissionable material from a fertile material ? CareerAddict is a registered trademark of DeltaQuest Media. Answer: Sulphur from coal can be removed by physical, chemical and microbial meAnswer: Microbial means has a number of advantages over other methods. —less susceptible to the effects of deposits left on flow path. What is equivalent evaporation in a boiler plant ? What is the effect of water injection and steam injection in gas turbine of heat rate and power output ? Answer: When convection heat transfer occurs between a solid body and a fluid and where circulation of fluid is caused and controlled by some mechanical. Answer: Alcohol has low cetane number and thus its ignition is prevented by compression. Answer: When the emissivity of material does not change with temperature, it is called gray body. 2. When interviewing candidates for the position of Mechanical Engineer, look for individuals who have highly creative, analytical minds. Although, of course, your objective in responding to this question should be honest, it should be a reply that makes you stand out from the crowd of applicants. Answer: Balanced draft refers to combination of forced and induced draft fans controlled to keep the furnace under slightly vacuum condition. A test specimen is stressed slightly beyond the yield point and then unloaded. However it increases gas turbine heat rate because of the additional heat consumption required to vaporise the water. Let us know your thoughts in the comments section below! 71. 70. What is the difference between isentropic process and throttlinglprocess ? 46. However, this insightful guide is sure to aid you in better understanding what to expect in your upcoming conversations. Answer: Velocity of fluid flow at solid surface is zero and it increases rapidly as distance from solid surface becomes greater, reaches a maximum value and then decreases to that of undisturbed fluid. Answer: By using throttling calorimeter. 29. 72. engine can be reduced by increasing ? How steam/water injection in combustion zone lowers NOx formation. 100. In radiative heat transfer, a gray surface is one whose emissivity is _____ ? As such, it’s important to prepare for them, even if they don’t come up. When answering this question, reiterate not only your basic mechanical engineering skills but also your more niche proficiencies that other candidates may not have. —Good efficiency over a wide range of operation. 94. It regards maintenance as the means to maintain the functions a user may require of machinery in a defined operating context’’. Question 20. For a given set of operating pressure limits of a Rankine cycle, for which cycle the efficiency will be highest ? This bacteria can remove 90-98% of pyritic sulphur from coal. 65. If same body were to move down a smooth inclined plane from same height, which parameters will be same on reaching the ground ? 12. 57. 82. Answer: Because the mean temperature of heat addition is higher for superheat cycle. Why work is considered as high grade of energy and heat as low grade energy ? Community Answers "It was good and I have learned so many things in his supervision." Answer: Breeding. It’s also important to mention that, going forward, you learned to be more aware, more conscientious, and so forth. Vaporised NH is injected into exhaust gases before it passes through the catalyst bed. 84. 54. It is usual practice to report performance characteristics of gas turbine at ISO conditions. In selecting an important new skill that you have learned in the past year, you are also confirming to your interviewer that you are actively pursuing new skills and have a passion for developing trends in engineering. Though one of the more basic job interview questions, this is one that nearly every interviewer will ask. 1. The distance between the solid surface and point where boundary layer velocity equals undisturbed flow (edge) is called boundary layer thickness. A final technical question we will make a note of, one that could arise during an interview, is a postulation regarding the mechanics of hydraulics. 43. However, working as a mechanical engineer means that you can’t afford to let your mind wander from the tasks at hand; indeed, the design of power-producing machines requires the utmost attention to detail. ? 66. —Short life of major turbine components. gowtham says: January 16, 2017 at 8:03 pm sir pls send me technical interview question in mechanical eng pdf. Some common questions that interviewers ask mechanical engineersinclude: 1. Combining the words turbine and propeller, a turboprop engine is a gas turbine jet engine that powers the propellers of said turbojet. What is boundary layer thickness in free convection case ? —less sensitive to the fouling of the flow path. sir pls send me technical interview question in mechanical eng pdf. Measure to minimise formation of NOx inhibit complete combustion and this results in formation of CO and voltatile organic compound (VOCs). Reply. Answer: 10, 12.5 and 16 respectively. Answer: Humidification in summer and dehumidification in winter. By making yourself aware of how to respond to questions such as these, you are preparing to portray yourself as knowledgeable, professionally assertive and reliable enough to take on any task that the firm may have for you. Answer: Constant volume. Answer: It is the rate at which radiation leaves a surface. If steam is perfectly dry, it’s quality is 100%. Why alcohol can’t be used in diesel engine ? We suggest you also read this article on frequently asked technical interview questions to mechanical freshers. This is an important question to ask any candidate, whether they’re an aspiring mechanical engineer freshly out of school or one who is already well established. MECHANICAL ENGINEERING Interview Questions PDF. What is factor of evaporation ? Answer: I section. What happens to two equal and opposite coplanar couples ?, Your email address will not be published. What is diagram efficiency in steam turbine ? What do you understand by effectiveness of heat exchanger ? 68. What do you understand by the term coagulation ? 26. A gas having a negative Joule-Thompson coefficient, when throttled, will become …. Here are some of the common topics for mechanical engineers – Depending on the company, the recruiters can ask about any subject they wish to. 4. Why a refrigeration compressor designed to operate with R22 refrigerant can’t be operated with R12 ? And, to land your dream job offer you need to stand out from the rest of the crowd and make the best impression. Under what condition a number of forces acting at a point are in equilibrium ? —simple in design, easy to manufacture, rugged in construction, less costly. Oxides of Ti and Mo are often incorporated as moderators. This is another popular technical question to give your interviewer may ask to get a better understanding of your knowledge of the field. 51. It’s also a tricky one, as there are three different laws of thermodynamics. Software engineering requires specialized knowledge and skills. Answer: Natural uranium. What Are The Primary Principles Upon Which Rcm Is Based? In general how the boundary layer and local film coefficient of heat transfer are related ? Answer: SCR is a post combustion method in which a catalyst is installed in flue gas where temperature could be of the order of 15-400°C. 6. 88. 5. Panelists: Colin Roddy, Bose Engineer Alix McCabe, ‘18 Luke Morris, ‘17 Answer: Pinch point is the temperature difference between the gas turbine exhaust leaving the evaporator section and the saturation temperature of steam at corresponding pressure (drum operat¬ing pressure). What would be the order of boundary layer in pipe flow (i) laminar (ii) transition, and (iii) fully turbulent ? 35. Ans: Normally they are looking for the subject in which their company is based on. You will be trained once you will be recruited. )In many cases you will be the only person they interview for the job, or you will compete with two or three other people for the position (which is nothing compared to managerial position… Best Cities ... but I was contacted for a 2nd technical interview. Answer: Smaller. 30. Answer: Jet pumps are easy to maintain and can be used to transport gases, liquids and mixtures of both. Answer: These characteristics affect SI engines in cold starting, icing of carburettor and dilution in crankcase respectively. ©2020 DeltaQuest Media. Ambient berometric pressure 1.0 kg/cm2. Reply. By adding certain chemicals (coagulants), gelatinous substances are formed which cause small particles to coalesce into groups large enough to be checked during filtering. Variable guide vanes are used to control the fuel-air mixture. As such, it is an important question to become aware of. What are improved low NOx combustors ? Answer: Two times the engine speed. 11. What is the name given to process of removing non condensables in steam and other vapour cycles ? Answer: Zero. A body is dropped from a certain height. Why the efficiency of superheat Rankine cycle is higher than that of simple Rankine cycle ? Ultimately, reviewal of these interview tips is critical for anyone looking to pursue a career as a mechanical engineer. 76. 77. What are these ? In which season the process of humidification and in which season dehumidifi-cation is used in air-conditioning ? —Increased complexity of engine control It is a branch of engineering that is related to industrial application of mechanics … A refrigerator and a heat pump are working on the reversed Carnot cycle between the same temperature limits. Answer: Evaporative Cooling. 24. 87. Further steam needs more space due to higher specific volume. Out of 2 stroke SI engine, 4 stroke SI engine, and 4 stroke CI engine, how the brake thermal efficiency behaves if these are to be used for road vehicles ? Answer: COP of refrigerator = COP of heat pump -1. Regardless of which answer you opt to give, it is a critical opportunity to share your passion, evidence of troubleshooting abilities and history of innovative enterprise. A condenser of a refrigeration system rejects heat at a rate of 60 kW, while its compressor consumes a power of 15 kW. If you are aware of mechanical engineering basics, You can answer these questions. What do you understand by forced convection ? Should this question be posed during an interview, the answer to give is quite simple. The list of subject-related interview questions for fresher mechanical engineers can be vast. Not only is this an ideal time to showcase your talents, but it is also a great opportunity to make your interviewer aware that you know how to complete the vital technical tasks at hand. 90. Answer: – 2°C. How would you explain complex designs to non-engineers? We suggest you to also read this article on frequently asked technical interview questions on manufacturing. 79. Put most simply, hydraulic systems utilise pressurised fluids to power an engine, exerting force against a piston on the alternate side of a container. 14. Answer: Leakage of Freon-12 can’t attain total concentration but it has all desirable characteristics as good refrigerant. Answer: It will increase. (iv) Lower the exhaust temperature, lower the heat rate.

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