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0&&ddHi FriendsBHEL paper consists of two parts.A) TechnicalB) AptitudeBoth parts consists 120 marks each. There is negative marking which 0.2.Technical paper1) How many links in slider crank mechanism?2) Deflection of cantilever beam subjected to end point load?3) Stress concentration factor Kf =?4) What is the unit of BHN?5) What is efficiency of riveted joint?6) Composition of Munz metal?7) One shaft is subjected to torque 1700 N-m having shear strength of 40Mpa. Determine the diameter?8) A reversible engine is working between the 600F and 60F. Carnot efficiency is equal to =9) Coefficient of restitution lies between =10) Pectlet number is equal to = a)Re*Nu b)Re*Pr c)Re*Gr11) Formula of effectiveness of heat transfer =12) Emissivity depends on 13) Reynolds number formula14) Production process for Al?15) Thick metals welded by following processes16) Logarithmic decrement is given by = 17) Magnification factor at resonance is given by = 18) Cutting forces decreases by = a) increasing rake angle b) decreasing rake angle c) increasing relief rake angle19) Some problem on Mohrs circle radius20) Volumetric strain =21) Pendulum problem Time is given length = ?22) For undamped system Transmission Ratio is R then a) b) 23) Which is not related to CI engine = ans) spark plug24) Cotter joint generally fail by25) Which coupling is used for intersecting shafts?26) No of teeth on gear and pinion is given, center distance is given, module = ?27) Coefficient of friction and angle is given, what is ration of tension in belt?28) What is lamis theorem?29) Condition for self locking 30) Discontinuous chips can be produced by.31) For critical speed should be a)>v2 b) >v332) Air at 20C blows over a hot plate 50 by 75 cm maintained at 250C. The convective heat transfer coefficient is 25W/m2. Cal the heat transfer.33) Metacenter always lies .34) Rotometer is used to measure.35) Formula for effort of a governor36) Stroboscope is used to measure..37) What is size of A4 paper?38) Some problem on riveted joint.39) Modulus of rigidity G is given by40) Wave properties in solids is depends on elasticity.41) Radiation heat transfer is directly proportional to.42) Escape velocity is given by v2gR43) Kinetic energy formula.44) Corolis component.45) Potent ional Energy theory is given by.46) Perpendicular axis thoerm47) Pappus thoerm.48) Center of gravity of a spherical shell..49) Angle and linear dimension is given by chamfer.50) For thick cylinders..51) N = 10 to N = 10E5 cycles then it is . a) finite life b)infinite life52) Value of steel youngs modulus 53) Endurance strength of steel equal to 54) Three problems on strain gauges .55) Three problems on vectors some related to work done.56) Straight line mechanism57) Some problem springs..58) Design on thermal stresses can be considered for a) concrete b)steel rolls c)blast furnace59) Velocity problem it is in the vector form to find displacement?60) Hardness is a property
BHEL Mechanical Engineering Paper I attended the BHEL Engineer Trainee written test in Mechanical stream. They conducted for four brances in Engineering: Comp sci, ECE, EEE and Mechanical. In Mechanical Branch there were a total of 240 questions. 120- Technical questions in Mechanical Engineering. 120- General Apptitude questions. (Quantitative Aptitude, Reasoning Ability, Logical thinking, English usage).The questions were mainly asked in Thermodynamics Engineering Mechanics Theory of machines Production tech If you are thorough with your subject, you can really do well in this session.[One Mark for correct answer, 1/5th for wrong answer. Five choices were given] Some questions which i remember are : 1)Unit of Entropy (J/kg K or kJ/kg K)?2)A mass of 100kg is falling from a height of 1 m and penetrates the sand into for 1 m. What is the resistance force given by sand?3)Ratio of specific heats of air ? (1.41)4)A body weighs 3 kg in air. If it is submerged in a liquid, it weighs 2.5 kg. What is the specific gravity of the liquid ?5)Two cars travell in same direction at 40 km/hr at a regular distance. A car comes in a opposite direction in 60km/hr. It meets each car in a gap of 8 seconds. What is the distance between them?6)A simple problem involing in hoops stress. For sphere: M= [3/2]*p*V* [density of pressure vessel material/Maximum working stress it can tolerate] For Thin walled pressure walls: Hoops stress or stress in the radial direction =p*r/2t?7) A problem in force calculation in a body moving in a inclined surface?8)Composition of bronze?ans. Copper+zinc.9) Compostion of stainless steel.?ans. iron+chromium+nickel+carbon.10) CI is manifactured in which process?ans. cupola process11)What percentage of carbon is preset in pig iron?ans. 4.5 to 6%.12)Water is available at 10m height. What is the pressure available?ans= pressure=density*g*height;p=1000*9.81*10;p=98100N/m2.13)What will happen if the speed of the centrifugal pump doubles?14)The unit eV is widely used in ?ans. Nuclear and atomic physics.15)What will happen to the resistance, when the diameter of the conductor is doubled?16)The power comsumed by a electrical device is 1000W at 250V, What is the resistance in the device?ans. Power= Voltage*current,Current=Power/Voltage,Current,I=1000/250=4amps. V=IR,Therefore R=250/4=62.5 ohms.17)Why DC current is not used in transformer?18)On what principle the sonar/ radar works?19)Bending moment diagram for the UDL is in what shape?20)Function of the distributor in petrol vehicles?ans. Spark timing.21)Which is not present in CI engines?ans. carburrettor.22)What will happen if one cylinder recieves more amount of fuel spray from injectors than other injectors?23)Purpose of draft tube in hydraulic turbines?ans. The purpose of a draft tube is toconvert some of the kinetic energy of the flow from the runner (the rotating part of the turbine) intopressure energy and thereby increase the efficiency ofthe hydro power turbine.24)What is the effect or reheater in the gas turbine?The advantage of reheater is significantly increased thrust; thedisadvantage is it has very high fuel consumption and inefficiency.25)Problems involving with fricition coefficient.26)Factor of safety = Yeild stress/Working stress.27)Which is the example of non parallel power transmission (Universal coupling)?28)For perpendicular shafts worm gear is used?29)A planet gear with 25 teeth is meshed with a sun gear of 100 teeth. Both are connected using a arm. How many rotations are needed for planet gear to complete one rotation around the sun gear?30)What is equivalent spring constant for spring in parallel?31) Some questions was asked related to boundary layer and vortex flow.32) 5 questions were asked in PERT, Process planning, Product planning, Break even analysis.33)How are tungsten and sintered composite materials are machined?(Electro Discharge Machining, EDM)General Apptitude:very easy.There are 120 questions .English:Detect the words with wrong spellings (5 questions).Fill in the blanks with appropriate words(5 questions).Two reading comprehensions were given(10 questions).Find the error in the sentence (8 questions).Reasoning:Seating arrangement problems.Find the relation between them.Quantitative ability:50% of the questions are from basic geometry .Remaining were very general and easy. But many questions are there that's y you should consider time factor and be quick.
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