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Home » Engineering » Mechanical Engineering » Aptitude Test - 9
1.The pressure inside the cylinder is ______ the atmospheric pressure during the exhaust stroke.
A. equal to
B. below
C. above
D. equal to
2.The increase of cooling water temperature in petrol engine will ____the knocking tendency.
A. not effect
B. decrease
C. increase
D. not effect
3.A carburettor is used to supply
A. petrol, air and lubricating oil
B. air and diesel
C. petrol and lubricating oil
D. petrol, air and lubricating oil
4.U233 is produced
A. artificially
B. as basic raw material
C. when thorium is irradiated by neutrons
D. artificially
5.The pressure at the end of compression, in diesel engines, is approximately
A. 10 bar
B. 20 bar
C. 25 bar
D. 10 bar
6.The energy released during the fission of one atom of Uranium - 235 in million electron volts is about
A. 100
B. 200
C. 300
D. 100
7.Morse test can be conducted for
A. petrol engines
B. diesel engines
C. multi-cylinder engines
D. petrol engines
8.The basic requirement of a good combustion chamber is
A. minimum turbulence
B. low compression ratio
C. high thermal efficiency and power output
D. minimum turbulence
9.The thermal efficiency of diesel engines on weak mixtures is
A. unaffected
B. lower
C. higher
D. unaffected
10.The injection pressure in a diesel engine is about
A. 10 bar
B. 100 bar
C. 150 bar
D. 10 bar
11.High speed compression engines operate on
A. Otto cycle
B. Diesel cycle
C. Dual-combustion cycle
D. Otto cycle
12.The nuclear power station at Tarapur has the reactor of the _____type.
A. pressurized water
B. boiling water
C. gas cooled
D. pressurized water
13.The secondary fuel used in nuclear power plants is
A. U233 and Pu239
B. U235 and Th232
C. U235 and Pu238
D. U233 and Pu239
14.Theoretically, a four stroke cycle engine should develop __ power as that of a two stroke cycle engine.
A. half
B. same
C. double
D. half
15.The higher combustion chamber wall temperature in compression ignition engines will __ knocking tendency.
A. increase
B. reduce
C. not effect
D. increase
16.The nuclear radiators produced in a reactor which must be sheilded are
A. electrons
B. ?, ? and ? rays
C. neutron and gamma rays
D. electrons
17.The delay period in compression ignition engines depends upon
A. temperature and pressure in the cylinder at the time of injection
B. nature of the fuel mixture strength
C. relative velocity between the fuel injection and air turbulence pressure of residual gases
D. temperature and pressure in the cylinder at the time of injection
18.The theoretically correct mixture of air and petrol is
A. 10:01
B. 15:01
C. 20:01
D. 10:01
19.The function of a distributor in a coil ignition system of I.C. engines is
A. to distribute spark
B. to distribute power
C. to distribute current
D. to distribute spark
20.A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be
A. stable under nuclear radiation
B. corrossion resistant
C. good thermal conductor
D. stable under nuclear radiation
21.The frictional power (F.P.) is given by
A. F.P. = B.P. - I.P.
B. F.P. = I.P. - B.P.
C. F.P. = B.P./I.P.
D. F.P. = B.P. - I.P.
22.A diesel engine has compression ratio from
A. 6 to 10
B. 10 to 15
C. 15 to 25
D. 6 to 10
23.A petrol engine, during suction stroke draws
A. air only
B. petrol only
C. a mixture of petrol and air
D. air only
24.A supercharged engine as compared to an ordinary engine
A. requires smaller foundation
B. is lighter
C. consumes less lubricating oil
D. requires smaller foundation
25.Which of the following does not relate to a compression ignition engine?
A. Fuel pump
B. Fuel injector
C. Governor
D. Fuel pump
26.Supercharging __________ the power developed by the engine.
A. has no effect on
B. increases
C. decreases
D. has no effect on
27.Uranium has isotopes
A. U234
B. U235
C. U238
D. U234
28.The colour of exhaust from diesel engine is generally
A. white
B. bluish
C. black
D. white
29.In compression ignition engines, swirl denotes a
A. haphazard motion of the gases in the chamber
B. rotary motion of the gases in the chamber
C. radial motion of the gases in the chamber
D. haphazard motion of the gases in the chamber
30.A mixture containing 65% of iso-octane and 35% of normal heptane will have
A. cetane number 65
B. octane number 65
C. qetane number 35
D. cetane number 65
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