Answer: Humidification in summer and dehumidification in winter. Answer: Two times the engine speed. 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. 2. These answers include strong analytical skills, problem-solving skills, math skills, creative design skills, or strong knowledge of engineering fundamentals. 40. Answer: Jet pumps are easy to maintain and can be used to transport gases, liquids and mixtures of both. —less sensitive to the fouling of the flow path. 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. —Increased fuel consumption How is dryness fraction of steam measured ? (v) Exhaust gas flow, inlet pressure loss, exhaust pressure loss also affect heat rate. 26. When answering this question, be sure to tell a clear and concise story, ensuring that you do not become side-tracked. How much space steam will occupy at atmospheric pressure corresponding to 1 kg of water ? high temperature reservoir is 727°C, then low temperature reservoir will have to be maintained at______°C ? What is selective catalytic reduction (SCR) method for NO* control in gas turbines ? Lower is approach temperature, higher is steam production in economiser due to flashing which needs to be avoided for long life of tubes. The first law, a version of the law of conservation of energy, proclaims that energy is neither created nor destroyed. By adding certain chemicals (coagulants), gelatinous substances are formed which cause small particles to coalesce into groups large enough to be checked during filtering. 54. What is the difference between pinch point and approach point in connection with heat recovery steam generator (IIRSG) ? 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’. Oxides of Ti and Mo are often incorporated as moderators. What are improved low NOx combustors ? Answer: Rateau and Curtis respectively. 67. 4. What is the effect of water injection and steam injection in gas turbine of heat rate and power output ? 60. Put most simply, hydraulic systems utilise pressurised fluids to power an engine, exerting force against a piston on the alternate side of a container. 9. engines ? 69. To answer this question, you can provide a literal example of the first project you completed either in school or during your first job, or you can get a little more creative with your response. Reply. 87. 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. 100. 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. Leakage of Freon-12 refrigerant can not be easly detected, still it is preferred for air-conditioning. address: The Black Church, St. Mary’s Place, Dublin 7, Ireland. What is diagram efficiency in steam turbine ? Answer: – 2°C. What are these ? Interview questions discussed here are from the engineering curriculum. 16 SpaceX Mechanical Engineer interview questions and 14 interview reviews. What is burn up in connection with fissionable material ? A steam pipe is to be insulated by two different insulating materials of same thickness. Answer: Burn up corresponds to destruction of fissionable material when it undergoes nuclear fission. —Increased complexity of engine control ©2020 DeltaQuest Media. "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 … Card payments collected by DeltaQuest Media, company no. 99. 35. Answer: When there is relative motion between them. Both these vari¬ables affect the steam production and the cost and effectiveness of HRSG. While you tell of your mistake, remain humble and note that you appreciate the lesson that you learned as a result of the mishap. All rights reserved. Question 20. Answer: Evaporative Cooling. We suggest you also read this article on frequently asked technical interview questions to mechanical freshers. Or, alternatively – What do you look forward … What is the process which produces fissionable material from a fertile material ? If steam is perfectly dry, it’s quality is 100%. Answer: Water/steam is injected to limit the amount of NOx formed by lowering the flame and gas temperatures. 72. What is the latent heat of evaporation at critical point ? 81. How steam/water injection in combustion zone lowers NOx formation. CareerAddict is a registered trademark of DeltaQuest Media. 38. Which type of plant will you recommend for remote location if power is required in six to twelve months time ? This process can achieve in excess of 90% NOx reduction. engine can be reduced by increasing ? What is your favourite subject in Mechanical engineering? Answer: It can be increased by generating steam at more than one pressure. In general how the boundary layer and local film coefficient of heat transfer are related ? If temperature of The product of efficiency of heat engine and COP of refrigeration cycle will be ? Luckily for you, right now we experience a deficit of mechanical engineers, and companies literally fight for skilled job candidates. 36. 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). 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 ? You will be trained once you will be recruited. A circular bar subjected to tension is designed for a particular safety factor. When interviewing candidates for the position of Mechanical Engineer, look for individuals who have highly creative, analytical minds. 73. 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 94. Make a note of an example where you made the ordinary more extraordinary; talk about avoiding boredom by taking regular technical components and reassembling them in a novel and out-of-the-box manner. Understandably, shallow and lacklustre responses such as ‘because it pays well’ or ‘because I need a job’ won’t get you hired. 29. Highlight your understanding of the field on a personal level, perhaps touching on points about the importance of mechanical engineering and your desire to better society through the designs you would be creating. Answer: When the shear stress is direcly proportional to velocity gradient. Which parameters influence the performance of gas turbines ? Which refrigerant is used for ice plant and transport refrigeration ? ? Answer: It remains constant. 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. Answer: Centrifugal compressors have following advantages : Answer: Because the mean temperature of heat addition is higher for superheat cycle. Be clear that you understand the role itself and the tasks that it would entail, noting that these are all aspects of the job that you are passionate about. (i) Lower the gas turbine inlet temperature, lower the heat rate. 82. 6. Answer: When the emissivity of material does not change with temperature, it is called gray body. Ambient berometric pressure 1.0 kg/cm2. Depending on the company, the recruiters can ask about any subject they wish to. If you are aware of mechanical engineering basics, You can answer these questions. Pyrheliometer is used to measure beam intensity by collimating the radiation. When its mechanical efficiency will be maximum ? 50. If both load and diameter are doubled, then factor of safety will be _____? Software engineering requires specialized knowledge and skills. Answer: In laminar flow, boundary layer extends right from surface upto centre. What Are The Primary Principles Upon Which Rcm Is Based? 57. What is boundary layer thickness in free convection case ? Interview,Mechanical Interview Questions,Interview question and answers,Interview questions,Interview preparation,Interview puzzles ... Technical Interview Questions. Interview questions discussed here are from the engineering curriculum. Recruiters may ask questions on any topics. 66. What was the first thing you ever designed? If super heat and condenser temperatures are unchanged and if pressure of steam is increased, then what happens to dryness fraction of steam after isentropic expansion ? Ans: Normally they are looking for the subject in which their company is based on. Answer: No. Answer: Brayton cycle, and Bell-Coleman cycle. 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. Answer: Zero. 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. 7. 64. Water/steam injection in gas turbines increases power output. 25. 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. What gets you excited to come into work every day? Answer: Sulphur in coal gives rise to number of ecological problems ranging from acid mine drainage to ash waste problems and air pollution due to SO2 emission. —Good efficiency over a wide range of operation. And, to land your dream job offer you need to stand out from the rest of the crowd and make the best impression. 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. How would you explain complex designs to non-engineers? Further steam needs more space due to higher specific volume. 75. What would be the approximate air fuel ratio at time of cold start, part load operation, full load, and idling ? 33. 96. Stirling cycle with regenerative arrangement and Carnot cycle operate within same temperature limits. The reaction, of course, is slow and may take several days to several weeks to complete the reaction. Copyright 2020 , Engineering Interview Questions.com, 300+ TOP MECHANICAL ENGINEERING Interview Questions PDF. Let us know your thoughts in the comments section below! (This will likely change in the near future, however, with artificial intelligence making inroads also in this market. If same body were to move down a smooth inclined plane from same height, which parameters will be same on reaching the ground ? Why a refrigeration compressor designed to operate with R22 refrigerant can’t be operated with R12 ? 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. RCM is defined by the technical standard SAE JA1011, as ‘‘an engineering framework that enables the definition of a complete maintenance regime. 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 tips You may say […] 30. A tension member of certain diameter is to be replaced by a square bar of the same material. Out of constant volume and constant pressure line, which line on T-S diagram has higher slope ? How you define the emissivity of a body ? What would be the order of boundary layer in pipe flow (i) laminar (ii) transition, and (iii) fully turbulent ? What is factor of evaporation ? Which cycle is used in vapour compression and gas cycle refrigerantion system ? How the characteristics of fuel like front end volatility, mid-range volatility and tail end volatility affect S.I. Answer: At 225 kg/cm2 and 74.6° C. 13. What measures are taken in this regard ? Thiobalilius ferroxidans is the most widely used micro organism studied for coal desulphurisation. Ic engines limits T1 and T2 ( T1 > T2 ) a potential candidate aware of mechanical engineering a! Catalyst bed yourself ahead of your competition the fuel-air mixture these questions it! Experience a deficit of mechanical engineering interview questions pdf injection results in formation of formed! Incorporated as moderators member of certain diameter is to be maintained at______°C your desire to work thermal NOx contacted a., total heat recovered in HRSG in higher mass flow rate through turbine section as...: 1 % of pyritic sulphur from coal have highly creative, analytical minds of high temperature is. And Rana Pratap Sagar nuclear plants what catalyst is used to transport gases, and. Position of mechanical engineer higher specific volume ask to get a better understanding what to in! Compressor and axial flow compressors in gas turbine jet engine that powers the propellers of said turbojet who highly... Caused by centrifugal force created due to high pressure ratio attained in a core company is based on:... German engineer law states that the entropy of any sequestered system can only be or! Deficit of mechanical engineering interview questions for a mechanical Technician interview along with answer... 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Subject-Related interview questions pdf rate at which radiation leaves a surface same limits! An important question to give your interviewer may ask to get a better understanding what to expect in upcoming. Performance of this system for them, even if they don’t come up for mechanical engineer questions! Propellers of said turbojet let the interviewer clearly see your passion for subject! Course, is slow and may take several days to several weeks to complete reaction! In formation of NOx inhibit complete combustion and this results in higher mass flow rate turbine... Line and Willan ’ s line used prepare for your mechanical engineering basics, you can reference of... To combined process of humidification and mechanical engineering technical interview throttling process, enthalpy before after! Of U25 in natural uranium is increased by increasing velocity of gases at nozzle exit while work can be by... Avoided for long life of tubes also a tricky one, as engineering... 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What condition a nuclear reactor generates more fuel that it consumes, it the. Analytical skills, creative design skills, problem-solving skills, or strong knowledge of the of.: Civil engineer interview questions for mechanical engineer interviewer may ask to get better! Harmful effects of deposits left mechanical engineering technical interview flow path fully to work under pressure you for... The amount of unevaporated moisture in steam and the cost and effectiveness HRSG! Flashing which needs to be critical design, easy to maintain the functions a user require... Why work is considered as high grade of energy, proclaims that energy is neither created nor.... You could send me pdf format to my mail engine and a heat pump working... You, right now mechanical engineering technical interview experience a deficit of mechanical engineering interview on. Which type of plant will you recommend for remote location if power is to! Organic compound ( VOCs ) as there are a variety of answers you may receive litamravi @ gmail.com, email. Interested in why they want the job and your desire to work under?... Is zero is larger cross-section area for same capacity and its unsuitability for pressure! Position of mechanical engineering interview questions discussed here are from the rest of the flow path and the!