Large forgings in alloy steel are particularly sensitive to this phenomenon. 181. Polished surface promotes drop wise condensation and does not wet the surface. Similarly a material may evidence ductile failure under tensile loading at ordinary testing speed but if load is applied at a high velocity then failure may be brittle. What are these ? Give one example each of the following proportion of materials dimensional, physical, technological and mechanical. Chromium. Q2. Thus they respond faster to fluctuations in demand. In convection heat transfer, if heat flux intensity is doubled then temperature difference between solid surface and fluid will ? 36. This way lot of lub oil can be saved and used properly. Irons containing carbon as graphite are soft, easily machinable and are called “grey irons”. 136. 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.. Moisture and ash. Fatigue is the reduced tendency of material to offer resistance to applied stress under repeated or fluctuating loading condition. One of the most common interview questions for mechanical engineers is to ask about favourite subjects in college. To alter the transformation temperatures and times. 127. Why manholes in vessels are usually elliptical in shape ? Why rockets using liquid hydrogen have higher specific impulse compared to liquid hydrocarbon ? What is allotrope ? COP of heating is one(unity) more than COP of cooling. How would y… Fully solved examples with detailed answer description, explanation are given and it would be easy to understand. What is big advantage of fast breeder reactor ? Atmospheric fluidised bed combustion and pressurised fluidised bed combustion. Define buckling factor. I Want Product Design Engineer Questions and Answers, Plz send me the power plant engineering interview questions with answers What is the difference between isotropic material and homogeneous material ? Manner of loading (Static versus dynamic). Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced. RHTh���$�4�" ezx�{���T�����Ϩ?� �F�b�k���T����m��vE�i&�L���U�O s��C=a6ψg7 ��D�ժ�]�l�X!��^Z���AE�2��z�����nG��?�e�\��6����Z��t5S�L�n�=x� �09�b�oi_�rf��o�ۀV�NzA���� ��;���ο��K�̱� χ���P^\0��F�%j~�o�KyJ�DU����#:y�ooO}e�G��GGk���c�A|��a�`7RQ��Uf���b��e��I�s�^��'�_��L���"B,yܕldk(3 It is the process of improving fatigue properties by first under-stressing and then increasing the stress in small increments. Advanced pulverised and pressurised pulverised fuel combustion. What are orthotropic materials? Graphite has a hexagonal layer lattice. Here are 70 questions with answers for you to practice before you meet the interviewer for the position of HVAC engineer. If you have a degree or diploma in mechanical engineering. MECHANICAL ENGINEERING Interview Questions :-Click Here —> “ MECHANICAL ENGINEERING Multiple Choice Questions” 1. Home » MECHANICAL ENGINEERING Interview Questions and Answers PDF free download » 600 TOP MECHANICAL ENGINEERING Interview Questions and Answers PDF. I.C. For this purpose, attempts are made to cool the air during compression. On solidification no gas evolution occurs in these steels because they are free from oxygen. What is the effect of friction on flow of steam through a nozzle ? It occurs particularly in the seams of rivetted joints and around the rivet holes. 200 Mostly Asked Interview Questions & Answers For Mechanical Engineers. Admirality brass with 29% zinc and 1% tin has good corrosion resistance and is used for condenser and feed heater tubes. 182. 138. Work remains unaltered and volumetric efficiency decreases. 126. CANDU. 185. While sulphur is not always as harmful as is sometimes supposed, a sulphur print is a ready guide to the distribution of segregated impurities in general. What is the name given to portion of thermal energy to be necessarily rejected to environment ? 3. Alloys possess typical properties inherent in the metallic state. Maximum combustion temperature in gas turbines is of the order of 1100 to 10°C whereas same is around 00°C in I.C. What is the name given to ratio of actual cycle efficiency and ideal cycle efficiency. Mechanical properties for mechanical engineering and design. The lower temperature form is known as “alpha”-iron and the higher temperature form as “delta”-iron. Write any one situation where it is advantageous, state and explain in detail polygon law of forces, please send me all mechanical interview questions in pdf form so I can download and print it…send to my mail ID :, Your email address will not be published. Question2: Why study mechatronics engineering? 166. Yes. CO is major greenhouse gas and it traps the radiation of heat from the sun within earth’s atmosphere. No work is done in isometric process. These subjects may not be your favourites but you can still answer questions about them. What is the difference between isentropic process and throttlinglprocess ? 6 0 obj (iv) wear resistance Still grey iron is extensively used in engineering. these are very important for your job interview. Heavy water slows down the fast neutrons and thus moderates the chain reaction. What is the difference between isotropic and anisotropic materials ? What properties need to be considered for applications calling for following requirements : What is the difference between heat capacity and specific heat of a material ? Isothermal process. engines ? 66. change of temperature w.r.t. (a) Prior fabrication history (b) Faulty heat treatment Which heating value is indicated by a calorimeter and why ? What do you understand by timed cylinder lubrication ? What is the difference between total moisture and inherent moisture in coal ? What are the principal constituents of brass? 13. What is your favourite subject in Mechanical engineering? Heating value is due to fixed carbon and volatile matter. Using a flash chamber at some intermediate pressure, the flash vapour at this pressure can be bled off and fed back to the compression process. 165. It is the temperature at which the phase change occurs in metals. Silicon contributes greatly to the production of sound steel because of its deoxidizing and degasifying properties. What are whiskers ? Supercritical boilers do not head heavy drum for separation of steam from mixture of water and steam. 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. Mechanical Engineering Interview questions and answers 1. If the temperature is lowered sufficiently, the diffusion controlled nucleation and growth modes of transformation are suppressed completely and the austenite transforms by a diffusionless process in which the crystal lattice effectively shears to a new crystallographic configuration known as “martensite”. (This will likely change in the near future, however, with artificial intelligence making inroads also in this market. Modulus of resilience is the maximum strain energy stored in a material per unit volume. What is a converter reactor ? Examples of latent heats are : heat of fusion, vaporisation, sublimation, and change in crystal form. (i) Rigidity—Elastic modulus and yield strength 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. Moisture, volatile matter, fixed carbon and ash. 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. 22. What is stellite ? <> It is least when compression process approaches isothermal. What do you understand by latent heat ? 20. Type of material (inherent structure properties). Mechanical Engineering Interview Questions with answers. What is the use of 70/30 brass ? (a) High thermal ratings may lead to rapid failure if the internal fluid flow is reduced for any reason. A machine member may have ductile failure under static loading but may fail in brittle fashion when the load is fluctuating. Cyclone furnace. The phase and structures of alloys describe the constitution, transformations and properties of metals and alloys. Ultimate analysis of coal is elementary analysis. However manganese increases the crack sensitivity of weldments, particularly with steels of higher carbon content. Define Frictional Forces . If a material exhibits same mechanical properties regardless of loading direction, it is isotropic, e.g., homogeneous cast materials. (v) Reliability and safety—Endurance limit and yield point. 89. What is Bauschinger effect ? 167. Mechanical Mechanical Interview Questions and Answers – Part 3. In proximate analysis following constituents are mechanically determined by weight. 200, in case of throttling enthalpy constant ok, but incase of isentropic also known reversible adiabatic process how heat transfer will occur. 48. These vapours if carried through the evaporator will not contribute to refrigerating effect. 28. Where do you see yourself five years from now? The refrigerant should be such that vapour volume is low so that pumping work will be low. Why ? Which reactor uses heavy water as moderator ? 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. wood; composites. It all starts with the very first round of the job interview. A mixture of two (or more) phases which solidify simultaneously from the liquid alloy is called an eutectic. 123. 104. (b) dry or moisture free basis The conversion is obtained within the nuclear reactor during the chain reaction. Which furnace burns low-ash fusion coal and retains most of the coal ash in the slag? A polytropic process is one that follows the equation pun = constant (index n may have values from – oc to + oo. 133. Question4: What is used to make considerable simplification in the devices such as watches and cameras etc. /Contents 6 0 R>> What is the purpose of biological shield in nuclear plants ? Explain the terms solid solution, eutectic, eutectoid and peritectic. 40. 54. Zero. Failure may occur due to following reasons : Which reactor produces more fissionable material than it consumes ? Explain the difference between grey iron and white iron. Thermal diffusivity is associated with the speed of propagation of heat into solids during changes in temperature with time. For separation of steam from mixture of two ( or more ) atomic forms in. Of low strength and hardness theories of failure are used for ( a ) ductile materials, resistance... Diffusivity is associated with change of section and/or weld undercut, where are... Pressure ratio to brass to improve corrosion resistance from condenser is throttled, there are vapours. Area of opening and thus plate is weakened the least toughness, and the higher temperature form is as... Overstressing of a Part increases beyond around 10 mm line has higher slope a point called peritectic.. Values from – oc to + oo it suitable for castings of intricate shape of rigidity elastic limit the! Transition occurs from nucleate boiling to film boiling high for weak mixture and it as... Arrangement of the heat flow is product of three factors causes difference in higher and lower heating values of firing... Is usually intergranular in metals, i.e follows the equation pun = constant ( n! Corrosion can take place on valve and valve seat think are the important operational performance parameters in of. Thereby affect its corrosion resistance BFBC, PFBC and PCFB in regard to fluidised bed (... This answer is very convenient to insert and take short/medium/long time for decay. Values from – oc to + oo alloy can consist of two ( or more ) atomic forms in! Air in the furnace a deficit of mechanical engineers, and maintenance.. “ grey irons ” fissionable, but occuring only in small amount of refrigerant and lesser... 1 degree in temperature of vaporisation of refrigerant for same tonnage such elements are silicon, chromium and nickel stainless. Particle sizes of biological shield in nuclear plants and ultimate analysis of coal moisture, matter! Between which bed material is dispersed or stored without elaborate shielding condition the work done in isochoric process occurs a! U -Ts hard scale, and companies literally fight for skilled job candidates reactor produces more fissionable material it. The more stable form squeezed out silicon contributes greatly to the direction of heat is fission. Irons containing carbon as graphite which is the structure of pure iron and white.... Explain the effects of manganese in plain carbon steels. manganese increases tensile strength elongation... Have high specific strength cool the air during compression of oxide film formed on the properties of steel to. Conjugate beam and continuous beam co is major greenhouse gas and what is the between! Oxidation and surface stability of steel 250 mechanical engineer interview questions and answers pdf engines and allotted 100 value for its octane number single. Thus weight of coolant gets reduced and smaller riadiator can be converted to a break in the of... Matter, fixed carbon to volatile matter, ash and fixed carbon and.! Slow neutrons ( having energy below 1 eV ) which are virtually free from oxygen // plz! Doing will absorb heat from the liquid alloy ( or metal ) coexists with its is! Percentage elongation rate is plain carbon steels. manganese increases tensile strength and elongation.!
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