Atlas Copco Placement Paper Technical - Other CHENNAI-21 May 2004
ATLAS COPCO - 2004 MAY 21 CHENNAI STEP I : WRITTEN TEST : 60 QUESTIONS 1 HOUR ELIMINATION ROUND Hygrometry deals with (ans. moisture content in air) 1 kg-m =9.81 J Relation between gauge, abs atm pressures Work-study deals with Time study deals with Expand MIS-Management Information System CPM and PERT deals with (ans. Determining the status of the project) To avoid cavitation in a centrifugal pump Inlet pressure should be high(ans) Discharge pressure should be high Expand 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 with Main objective behind plant layout is to avoid back tracking To minimize the space occupied Efficiency of diesel engine as compared to petrol engine under same rated load (high) Which of the following is not present in a CI engine Fuel injector Carburetor (ans) Fuel pump Which of the following is not present in a SI engine Spark plug Carburetor Fuel injector(ans) pour point is ( min temp at which a liquid flows at set condition) Zeroth law of thermodynamics In 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 in Conduction Convection Conduction and convection All modes of heat transfer. Orifice Definition a. provision for flow of liquid with regulation Break 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 same Compressed air coming out of a punctured football Remains at the same temperature Becomes hotter Becomes cooler Heat transfer takes place as per Second law First law Zeroth law Choking in compressor means a. fixed mass flow rate independent of the pressure ratio (ans) Formation of frost in refrigerator Can be prevented if design is proper Heat transfer becomes more? Heat loss Immaterial (ans) Supercharging is the process of (increasing the density of the inlet charge) How will you find the unburnt mixture in exhaust gas Analyzing CO Analyzing Oxygen Compression ratio is the ratio of Delivery pr.to inlet pr. Inlet pr to delivery pr. Stroke volume to clearance volume To reduce moisture troubles the compressor main should be Vertical Horizontal Slanting Critical activity is Zero float High float Low float Cash discounts is based on Sold on credit Bargaining capacity of the seller Payment of instant cash 1 kW-hr=3600 kJ. which process is more effective for compression isothermal(ans) adiabatic polytrophic What 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 lowest Compressor Condenser Expansion valve Evaporator In 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 is A 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 is a. The cooling effect produced when melting one tone of ice Unit of power( Watt) What is the use of the reverse flow of air in compressor Cleaning the dust particles settled Velocity of the air flow increases pressure increases Rota meter ?Flow measurement If we use petrol in diesel engine (lot of fuel will remain unburnt) The intake of air in an air compressor can be had from An area nearby coal yard An area nearby a cooling tower A room in which conditioned air is maintained at 20C Atm air maintained at 1 C STEP II : INTERVIEW - ELIMINATION ROUND STEP III : GROUP DISCUSSION ? ELIMINATION ROUND STEP IV : INTERVIEW WITH COMPANY CHIEF AT PUNE
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