Provided by www.YuvaJobs.com - Atlas Copco Technical - Other ATLAS COPCO - 2004 MAY 21 CHENNAISTEP I : WRITTEN TEST : 60 QUESTIONS 1 HOUR ELIMINATION ROUNDHygrometry deals with (ans. moisture content in air)1 kg-m =9.81 JRelation between gauge, abs atm pressuresWork-study deals withTime study deals withExpand MIS-Management Information SystemCPM and PERT deals with (ans. Determining the status of the project)To avoid cavitation in a centrifugal pumpInlet pressure should be high(ans)Discharge pressure should be highExpand NTP-(Normal temperature and press)Dalton’s law of pressure(Total pressure equals sum of partial pressures)As per Avogadro’s hypothesis(Molecular wt of all gases occupy the same volume under same conditions of temp and pressure)Use of intercooler-(to reduce work input)Use of after cooler-(to reduce volume of receiver)water hammer occurs (due to sudden obstruction in flow)ABC analysis deals withMain objective behind plant layout isto avoid back trackingTo minimize the space occupiedEfficiency of diesel engine as compared to petrol engine under same rated load (high)Which of the following is not present in a CI engineFuel injectorCarburetor (ans)Fuel pumpWhich of the following is not present in a SI engineSpark plugCarburetorFuel injector(ans)pour point is ( min temp at which a liquid flows at set condition)Zeroth law of thermodynamicsIn value engg “value” means----------second law of thermodynamics deals with (ans: entropy)Mach no deals with------Output=9kW, Input=30kW, Efficiency=? (Ans: 30%)Overall hear transfer co-eff. Present inConductionConvectionConduction and convectionAll modes of heat transfer.Orifice Definitiona. provision for flow of liquid with regulationBreak even point.(ans:no profit and no loss)If a block of ice floating in a tub of water and gets melted then what will be the level of water a. falls down b.rises ,c. remains the sameCompressed air coming out of a punctured footballRemains at the same temperatureBecomes hotterBecomes coolerHeat transfer takes place as perSecond lawFirst lawZeroth lawChoking in compressor meansa. fixed mass flow rate independent of the pressure ratio (ans)Formation of frost in refrigeratorCan be prevented if design is properHeat transfer becomes more’Heat lossImmaterial (ans)Supercharging is the process of (increasing the density of the inlet charge)How will you find the unburnt mixture in exhaust gasAnalyzing COAnalyzing OxygenCompression ratio is the ratio ofDelivery pr.to inlet pr.Inlet pr to delivery pr.Stroke volume to clearance volumeTo reduce moisture troubles the compressor main should beVerticalHorizontalSlantingCritical activity isZero floatHigh floatLow floatCash discounts is based onSold on creditBargaining capacity of the sellerPayment of instant cash1 kW-hr=3600 kJ.which process is more effective for compressionisothermal(ans)adiabaticpolytrophicWhat did W.H. Taylor do?An adiabatic compression is one in which (no heat enters or leaves the system)What happens if the refrigerator doors are kept open?a. The room will be warmed up gradually (ans)In which device, the temp of the refrigerant is the lowestCompressorCondenserExpansion valveEvaporatorIn break even analysis ,profit occurs when (sales revenue >total cost)A material piece weighs 2.5 kg in air and 3 kg, when immersed in water, then sp.gr isA body of sp.gr 7 is immersed in mercury of sp.gr 13.6. What percent of the body will be immersed in water? (ans. 0.515)1 tone of refrigeration isa. The cooling effect produced when melting one tone of iceUnit of power( Watt)What is the use of the reverse flow of air in compressorCleaning the dust particles settledVelocity of the air flow increasespressure increasesRota meter –Flow measurementIf we use petrol in diesel engine (lot of fuel will remain unburnt)The intake of air in an air compressor can be had fromAn area nearby coal yardAn area nearby a cooling towerA room in which conditioned air is maintained at 20CAtm air maintained at 1 CSTEP II : INTERVIEW - ELIMINATION ROUNDSTEP III : GROUP DISCUSSION – ELIMINATION ROUNDSTEP IV : INTERVIEW WITH COMPANY CHIEF AT PUNE  Provided by www.YuvaJobs.com - Atlas Copco Technical - Other