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Home » Engineering » Aptitude Test - 122
Hassan
1.In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is _____ the atmospheric pressure.
A. equal to
B. below
C. above
D. equal to
2.A diesel engine is ______ as compared to petrol engine, both running at rated load.
A. equally efficient
B. less efficient
C. more efficient
D. equally efficient
3.Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine ?
A. inlet valve closing after bottom dead centre
B. inlet valve closing before bottom dead centre
C. inlet valve opening before top dead centre
D. inlet valve closing after bottom dead centre
4.The pressure at the end of compression, in petrol engines, is approximately
A. 10 bar
B. 20 bar
C. 25 bar
D. 10 bar
5.Solid fuel fabricated into various small shapes, which are assembled to form fuel elements, is in the form of
A. plates
B. pallets
C. pins
D. plates
6.The turbine of the turbo-prop engine is __________ that of the turbo-jet engine.
A. same as
B. smaller than
C. bigger than
D. same as
7.A higher compression ratio causes
A. pre-ignition
B. increase in detonation
C. an acceleration in the rate of combustion
D. pre-ignition
8.Which of the following statement is correct ?
A. Compression ratio for petrol engines varies from 6 to 10.
B. Higher compression ratio in diesel engines results in higher pressures.
C. Petrol engines work on Otto cycle.
D. Compression ratio for petrol engines varies from 6 to 10.
9.The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is
A. four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
B. four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
C. four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
D. four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
10.The combustion in compression ignition engines is
A. homogeneous
B. hetrogeneous
C. both (a) and (b)
D. homogeneous
11.Which of the following fuel detonates readily ?
A. Benzene
B. Iso-octane
C. Normal heptane
D. Benzene
12.Spark plugs in automobiles generally have a gap between
A. 0.3 to 0.7 mm
B. 0.2 to 0.8 mm
C. 0.4 to 0.9 mm
D. 0.3 to 0.7 mm
13.In a petrol engine, if diesel is used, then the engine will
A. not run
B. run more efficiently
C. run at high speed
D. not run
14.Number of working strokes per min. for a four stroke cycle engine are _____ the speed of the engine in r.p.m.
A. equal to
B. one-half
C. twice
D. equal to
15.The air standard efficiency of an I.C. engine depends on
A. fuel used
B. speed of engine
C. compression ratio
D. fuel used
16.The knocking tendency in spark ignition engines may be decreased by
A. controlling the air-fuel mixture
B. controlling the ignition timing
C. controlling the exhaust temperature
D. controlling the air-fuel mixture
17.Alpha-methyl-naphthalene (C11 H10) has a cetane number of
A. 0
B. 50
C. 100
D. 0
18.In a petrol engine, the mixture has the lowest pressure at the
A. beginning of suction stroke
B. end of suction stroke
C. end of compression stroke
D. beginning of suction stroke
19.Which of the following does not relate to a spark ignition engine ?
A. Ignition coil
B. Spar kplug
C. Carburettor
D. Ignition coil
20.The increase in intake temperature of internal combustion engines will ___ efficiency.
A. have no effect on
B. increase
C. decrease
D. have no effect on
21.The reflectivity depends upon
A. geometry of the reflector
B. energy of neutrons
C. properties of the reflector
D. geometry of the reflector
22.In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have
A. low density
B. low temperature
C. long ignition delay
D. low density
23.A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is
A. 248 cm3
B. 252 cm3
C. 264 cm3
D. 248 cm3
24.Iso-octane (C8H18) has octane number of
A. 0
B. 50
C. 100
D. 0
25.The operation of forcing additional air under pressure into the engine cylinder is known as
A. supercharging
B. carburation
C. turbulence
D. supercharging
26.The thermal efficiency of a petrol engine is __________ as compared to diesel engine.
A. same
B. less
C. more
D. same
27.The compression ignition engines are governed by
A. hit and miss governing
B. qualitative governing
C. quantitative governing
D. hit and miss governing
28.The specific fuel consumption per B.P. hour for a diesel engine is about
A. 0.2 kg
B. 0.25 kg
C. 0.3 kg
D. 0.2 kg
29.The ignition quality of diesel oil is expressed by
A. cetane number
B. octane number
C. calorific value
D. cetane number
30.In a four stroke cycle petrol engine, the expansion
A. starts at top dead centre and ends at bottom dead centre
B. starts at 30° before top dead centre and ends at 50° before bottom dead centre
C. starts at 30° after top dead centre and ends at 50° after bottom dead centre
D. starts at top dead centre and ends at bottom dead centre
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