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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