Which reactor produces more fissionable material than it consumes ? length of path. Steels which have had most of their dissolved oxygen removed are called “fully killed steels”. The temperatures at which the phase changes occur are called critical points (or temperatures). For this purpose, attempts are made to cool the air during compression. Basics of Mechanical Engineering, BME Study Materials, Engineering Class handwritten notes, exam notes, previous year questions, PDF free download 137. Axis. It is an automatic machine in which workpiece alongwith fixture is transferred from one station to other automatically and several operation on workpiece are performed at each station. If a material exhibits same mechanical properties regardless of loading direction, it is isotropic, e.g., homogeneous cast materials. Specific strength of materials is very high when they are in fibre size but lower when they are in bar form Why ? What are orthotropic materials? Out of constant pressure and constant volume lines on TS diagram which line has higher slope ? 85. These are associated with change of section and/or weld undercut, where tubes are expanded or welded into headers. (d) Sudden failure of the boiler tube due to corrosion arises from embrittlement of the carbon steel due to interaction between atomic hydrogen from the corrosion process and the iron carbide present in the steel. 81. 123. 29. It is a material having same elastic constants in all directions. What are these ? Irons with fairly equal proportions of graphite and iron carbide have intermediate hardness and are called “mottled” irons. What do you understand by latent heat ? The heat capacity of a material is the amount of heat transformed to raise unit mass of a material 1 degree in temperature. (a) as received or fired (wet) basis Which element is added in steel to increase resistance to corrosion ? sir it’s a kindly request, please send me all important mechanical interviews questions & answers in pdf format that’s asked by interviewer. How is ceramic defined ? change of temperature w.r.t. It decreases thermal efficiency but increases net output. Which reactor requires no moderator ? Such elements are silicon, chromium, molybdenum, tungsten, titanium and niobium. 154. Manner of loading, and the rate of loading promote transition from ductile to brittle fracture. 188. Magneto hydrodynamic electricity generation. Which pollutant is major greenhouse gas and what is its effect ? This microstructure is called pearlite. It is a solid formed by combination of metallic and non-metallic elements. 89. 51. Which is the common element between brass and bronze ? Why entropy change for a reversible adiabatic process is zero ? What is the percentage of chromium in 18 : 4 : 1 IISS ? 47. Why rockets using liquid hydrogen have higher specific impulse compared to liquid hydrocarbon ? A refrigent should have . Intensive properties. What is mottled iron ? What is the difference between isotropic and anisotropic materials ? engine maximum temperature attained is higher than in gas turbine. Why ? Rubber. Type of material (inherent structure properties). (c) Failure may arise due to overstressing of a reduced section of metal. 149. What is difference between conjugate beam and continuous beam ? 109. 112. Low water in boiler drum is unsafe because it may result in overheating of water tubes in furnace. Save my name, email, and website in this browser for the next time I comment. Low melting point and high fluidity making it suitable for castings of intricate shape. 72. Entropy is extensive property. What is the role of silicon as alloying element in steels ? What type of boiler does not need a steam drum ? In a Rankine cycle if maximum steam pressure is increased keeping steam temperature and condenser pressure same, what will happen to dryness fraction of steam after expansion ? A continuous beam is one which is resting on more than two supports. Anergy. 18. What is the difference between austenite stabilisers and ferrite stabilisers ? What are these ? Eutectoid. Zinc is resistant to corrosion but is attacked by acids and alkalies. 175. Describe transfer machines in brief. A mixture of two (or more) phases which solidify simultaneously from the liquid alloy is called an eutectic. By addition of zinc in copper, both tensile strength and elongation increases. Which reactor has no moderator ? In what forms of cubic pattern, iron exists ? In general, an increase in carbon content produces higher ultimate strength and hardness but lowers ductility and toughness of steel alloys. How it is caused ? It is the process of improving fatigue properties by first under-stressing and then increasing the stress in small increments. In addition to high-temperature strength, resistance to corrosion is also important. Why high latent heat of vaporisation is desirable in a refrigerant ? Circulating fluidised beds operate with relatively high gas velocities and fine particle sizes. 95.Which parameter remains constant in isochoric process ? Why the electric motor of a fan with backward curved blades is never got overloaded under any condition ? Modulus of resilience is the maximum strain energy stored in a material per unit volume. 69. 183. 180. It is absolutely paramount that you feel comfortable adding somebody to your team, and you definitely want to know whether or not they know their stuff. 147. Any obstruction of a streamflow over which water flows is weir. 191. 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. Steam Boilers, Engines, Nozzles and Turbines PART 1 . In ultimate analysis, chemical determination of following elements is made by weight: Fixed and combined carbon, H, O, N, S, water and ash. Which furnace burns low-ash fusion coal and retains most of the coal ash in the slag?

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