169. 50. 25. What is the difference between hard water and soft water ? As an alloying element, manganese serves as an inexpensive means of preventing “hot shortness”. 93. The concentration of U-35 in the uranium hexafluoride is increased from the 0.7% in natural uranium to to 4%. Fatigue is the reduced tendency of material to offer resistance to applied stress under repeated or fluctuating loading condition. Type of material (inherent structure properties). 178. The face-centered cubic form existing between 910°C and 1400°C is referred to as “gamma-iron”. Lamination in boiler tubes or score marks arising from the cold drawing of tubes, give rise to premature failure and may promote corrosion at these regions. Further deerease in transformation temperature causes a lengthening of the ncubation period and a change in structure of the product to a form known as “bainite”. 199. 104. Whether individual components in composite materials retain their characteristics or not? For higher flow, power consumption gets lower. Such elements are silicon, chromium, molybdenum, tungsten, titanium and niobium. For reversible isothermal steady-flow processes or for reversible constant-pressure isothermal nonflow processes, change in free energy is equal to net work. What should be done to prevent a safety valve to stick to its seat ? Explain the terms solid solution, eutectic, eutectoid and peritectic. 137. Your new employer is going to … 64. Heat pump. What are whiskers ? 20. Convective heat transfer is effected between a solid and fluid by a combination of molecular conduction within the fluid in combination with energy transport resulting from the motion of fluid particles. In some engines glycerine is used in place of water for cooling of engine. Q3. 73. Work remains unaltered and volumetric efficiency decreases. This document was originally initiated by Planning Engineer website by 183. What do you understand by sulphur print ? 86. 175. 40. What are orthotropic materials? Because a large portion of turbine work is eaten away by compressor and its inefficiency will affect net power output and cost of generation. What does thermal diffusivity of metals signify. In convection heat transfer, if heat flux intensity is doubled then temperature difference between solid surface and fluid will ? An alloy can consist of two or more components. 34. It is caused by lack of uniformity in metal. This civil engineering interview questions and answers pdf eBook you can find all the important civil engineering interview questions asked in big construction companies like L&T, Tata Projects, and many reputed civil engineering companies.. 3 0 obj How it is caused ? What is the principle of mechanical refrigeration ? Silicon contributes greatly to the production of sound steel because of its deoxidizing and degasifying properties. Maintenance Engineer Interview Preparation Guide . endobj Metallic bond is strongest and molecular bond also known as Vander Waals bond is weakest. Free energy (or Helmholtz function) is defined as/= u -Ts. Why efficiency of gas turbines is lower compared to I.C. Alloys in which the components solidify simultaneously at a constant temperature the lowest for the given system, are called eutectic alloys. 56. <>>><>>><>>><>>><���)>>>><>>><>>><���=�"45n� ��^V�)>>>>] Low water in boiler drum is unsafe because it may result in overheating of water tubes in furnace. but write some engine related question. 197. length of path. Greater than 100%. What is view factor ? 5 0 obj these are very important for your job interview. For supersonic isentropic flow at the inlet section a higher velocity and lower pressure will exist at the exit but if a shock wave occurs in the diffuser then a higher pressure will exist at the exit. The best way to reduce the stress is to be prepared for your job interview. Thus weight of coolant gets reduced and smaller riadiator can be used. The refrigerant should be such that vapour volume is low so that pumping work will be low. 200. List two effects of manganese in plain carbon steels.  Irons containing carbon as graphite are soft, easily machinable and are called “grey irons”. 250+ Mechatronics Engineering Interview Questions and Answers, Question1: What is Mechatronics? A phase is a homogeneous portion of a system having the same composition and the same state of aggregation throughout its volume, and separated from the other portions of the system by interfaces. Entropy is extensive property. These subjects may not be your favourites but you can still answer questions about them. 145. What are thermal neutrons ? Fast breeder reactor. Throttling process. Fuel ratio is the ratio of its % age of fixed carbon to volatile matter. Copyright 2020 , Engineering Interview Questions.com, MECHANICAL ENGINEERING Multiple Choice Questions”, 600 TOP MECHANICAL ENGINEERING Interview Questions and Answers PDF. Top 120 Mechanical fitter interview questions answers pdf ebook free download. It is the temperature at which the phase change occurs in metals. Which factors influence the type of fracture in failure of a material ? 54. Home » MECHANICAL ENGINEERING Interview Questions and Answers PDF free download » 600 TOP MECHANICAL ENGINEERING Interview Questions and Answers PDF. kumaresan.k 10-16-2016 05:38 AM mechanical engineering questions and answers for interview these question are very important nice questions Chandra prakash 09-20-2016 12:56 PM Suggetion stream 182. What causes hardness in steel ? 67. Temperature. Liquid hydrogen has higher burning velocity. 22. 139. Rubber. 69. The chemical elements that make up an alloy are called its components. The material like U 38 which can be converted to a fissile material by the neutron flux is called “fertile material”. Download 70 Question & Answers for HVAC Engineer Interview These technical questions for HVAC interview are the top questions that come any interview for airconditioning, heating or ventilation … 10. 173. 188. An elastomer is a polymer when its percentage elongation rate is ? 2. Which element causes difference in higher and lower heating values of fuel ? Why axial flow compressor is preferred for gas turbines for aeroplanes ? If a material exhibits same mechanical properties regardless of loading direction, it is isotropic, e.g., homogeneous cast … What is difference between conjugate beam and continuous beam ? These desirable effects partially compensate for the tendency of silicon to lower the creep properties of steel. Hard water contains excess of scale forming impurities and soft water contains very little or no scale forming substances. Fuel flexibility, electrical load following capability, reliability, availability, and maintenance ease. Mechanical Engineering MCQ questions and answers for an engineering student to practice, GATE exam, interview, competitive examination and entrance exam. Styrene-butadine rubber. Moisture and ash. MECHANICAL ENGINEERING Interview Questions and Answers PDF free download, 300 MECHANICAL ENGINEERING Interview Questions and Answers, 400 MECHANICAL ENGINEERING Interview Questions and Answers, 500 MECHANICAL ENGINEERING Interview Questions and Answers, 600 MECHANICAL ENGINEERING Interview Questions and Answers. 112. I.C. n-heptane and ISO-octane. Thermal diffusivity is associated with the speed of propagation of heat into solids during changes in temperature with time. (i) Rigidity—Elastic modulus and yield strength Heating value is due to C, H and S. If steel is heated above the A critical temperature to dissolve all the carbides, and then cooled, suitable cooling through the cooling range will produce the desired size and distribution of carbides in the ferrite, imparting different properties. The materials which can give nuclear fission e.g. Silicon increases the electrical resistivity of steel and decreases hysteresis losses. Why the work per kg of air flow in axial flow compressor is less compared to centrifugal compressor for same pressure ratio ? What it is concerned with ? Whether superheated steam can be treated like ideal gas ? 57. 113. What is Curie point ? 29. (v) reliability and safety. As compression ratio increases, thermal n increases. Specific strength of materials is very high when they are in fibre size but lower when they are in bar form Why ? When effect of variations in specific heats is considered then how do maximum temperature and pressure vary compared to air standard cycle ? Whiskers are very small crystals which are virtually free from imperfections and dislocations. 41. This phase has a tetragonal crystal structure and contains carbon in supersaturated solid solution. Get doubled. (iii) strength to withstand overload without fracture. A state in which a liquid alloy (or metal) coexists with its crystals is a two-phase system. Heavy water is used as a moderator. For instance, a homogeneous pure metal or alloy is a single-phase system. A stress in excess of elastic limit, with no external force to oppose it, will relieve itself by plastic deformation until it reaches the value of the yield stress. 167. In most steels this stress is approximately 50% of the ultimate tensile strength and it is defined as the stress which can be endured for ten million reversals of stress. Mechanical Engineering questions and answers with explanation for interview, competitive examination and entrance test. In general, an increase in carbon content produces higher ultimate strength and hardness but lowers ductility and toughness of steel alloys. wood; composites. 186. 8. Nil. What is the difference between heat capacity and specific heat of a material ? It corresponds to maximum heat flux at which transition occurs from nucleate boiling to film boiling. For subsonic flow at inlet section of a diffuser a lower velocity and higher pressure will exist at the exit section. An increase in carbon content lessens the thermal and electrical conductivities of steel and increases its hardness on quenching. 66. 21. What is polytropic process ? Molten salt breeder reactor. 120. Question2: Why study mechatronics engineering? (iv) wear resistance What is the difference between scavenging and supercharging ? Eutectoid. What is the function of thermostat in cooling system of an engine ? CLICK HERE—>Engineering Multiple Choice Questions and Answers. Alloys are therefore more than metals alone. What do you understand by fuel cycle in nuclear plants ? What is coaxing ? Interview,Mechanical Interview Questions,Interview question and answers,Interview questions,Interview preparation,Interview puzzles updated on Dec 2020 ... so it can expand the pipes that is what engineers designed the LNG pipes are curve type. Maximum combustion temperature in gas turbines is of the order of 1100 to 10°C whereas same is around 00°C in I.C. Out of constant pressure and constant volume lines on TS diagram which line has higher slope ? What are two essential conditions of perfect gas ? Chromium and nickel. How with alloying of steel it is possible to a achieve properties which can not be achieved with heat treatment ? but write some engine related question. What is burnt-out point ? How the thickness of thermal boundary layer and thickness of hydrodynamic boundary layer related ? Civil Engineering Interview Questions and Answers Download – Civil Engineering, the branch that deals with everything structural, has made a lasting impact on the world by adorning it with its beautiful structures and constructions.This discipline of engineering … Magneto hydrodynamic electricity generation. Stalling is a local phenomenon and it occurs when How breaks away from the blades. For conduction of heat, the instantaneous rate of heat flow is product of three factors. �C�PmxB^�����KE�0����*\��f��"���pWa`���,\Es>n�2+|��IvU]�Bciky6e�n���Jf(. 146. In this article, we will discuss commonly asked interview questions and answers on mechanical Design. What is the critical temperature of a refrigerant ? 91. 180. Draw a neat sketch of worm and worm wheel, name the partsof the machine and write V.R of the machine It exists in ordinary steels at elevated temperatures, but it is also found at ordinary temperatures in some stainless steels. What are these ? Alloys possess typical properties inherent in the metallic state. The moisture content of the bulk as sampled is referred to as total moisture, and that of the air dried sample is called inherent moisture. 166. Define buckling factor. 101. 37. Eutectoid alloys are the alloys for which two solid phases which are completely soluble become completely insoluble on cooling before a certain temperature called eutectoid temperature. 109. 49. Each form is known as “allotrope”. 118. Galvanizing consumes the largest proportion of zinc. What is the percentage of carbon in cast iron ? What is big advantage of fast breeder reactor ? Modulus of resilience is the maximum strain energy stored in a material per unit volume. 156. Both column and strut carry compressive load. What is fuel ratio ? What for pyranometer is used ? What are the major effects of alloying elements? Explain the difference between AFBC, BFBC, PFBC and PCFB in regard to fluidised bed technologies. 162. For pure substances, the heat effects accompanying changes in state at constant pressure (no temperature change being evident) are known as latent heats. To which countries these standards belong ? 52. What is the maximum use of magnesium ? To modify the room temperature and elevated temperature strengths of given structures by (a) stiffening the crystals and (b) introducing complex precipitates which tend to harden the steel. For ductile materials, theories of failure used are maximum shear stress theory, and maximum energy of distortion theory; while for brittle materials, theory of maximum principal stress, and maximum strain are used. 128. 194. Ferrite is the solid solution of carbon and other constituents in alpha-iron. 100. Purging ensures that any unburnt fuel in furnace is removed, otherwise it may lead to explosion. To alter the transformation temperatures and times. Tag: qa qc mechanical engineer interview questions and answers pdf. (a) High thermal ratings may lead to rapid failure if the internal fluid flow is reduced for any reason. A peritectic transformation involves a reaction between a solid and liquid that form a different and new solid phase. What is allotrope ? Explain the difference between the points of inflexion and contraflexure. Which two elements in feed water can cause corrosion of tubes and plates in boiler ? 110. 129. Gross heating value because steam is condensed and heat of vapour formed is recovered. Alloys are produced by melting or sintering two ore more metals, or metals and a non-metal, together. Some elements exist in more than one crystalline form. 18. Why ? How heat treatment alters properties of steel ? 39. In circulating fluidised bed combustion (CFBC) system, bed is operated at higher pressure leading to high heat transfer, higher combustion efficiency, and better fuel feed. Non uniform corrosion over the entire metal surface, but occuring only in small pits is called pitting. 24. It occurs particularly in the seams of rivetted joints and around the rivet holes. Why consumption of lubricating oil is more in two-stroke cycle petrol engine than four-stroke cycle petrol engine ? What do you understand by latent heat ? This is the mechanical engineering questions and answers section on 'Engineering Mechanics' with the option for disscussion in forum , usefull for competitive examination and entrance test like GATE ESE PSU. A plant which initiates, sustains, controls and maintains nuclear fission chain reaction and provides shielding against radioactive radiation is nuclear reactor. Cable attached to the production of sound steel because of following characteristics the and! Decay to an accepetable low level isothermal, isochroic, isobaric, free expression, throttling and adiabatic processes.. Repeating arrangement of atoms gets squeezed out matter, ash and fixed carbon interview! 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