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Mechanical Engineering Objective Questions { Internal Combustion Engines }



218. Air cycle efficiency for a petrol engine having compression ratio of 5 : 1 will be
A.80%
B.60%
C.47.5%
D.30%
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219. Which of the following fuel detonates readily
A.Benzene
B.Iso-octane
C.N-heptane
D.Alcohol
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220. Which of the following fuel has little tendency towards detonation
A.Benzene
B.Iso-octane
C.N-heptane
D.Alcohol
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221. In spark ignition engines, the knocking tendency can be decreased by
A.Decreasing compression ratio
B.Controlling intake throttle
C.Controlling ignition timing
D.Adding dopes like tetraethyle lead and ethylene dibromide
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222. For spark ignition engines, fuels in order of decreasing knock tendency are
A.Paraffins, napthenes, aromatics
B.Napthenes, paraffins, aromatics
C.Paraffins, aromatics, napthenes
D.Aromatics, paraffins, napthenes
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223. Tendency of detonation in S.I. engines increases with
A.Decrease of engine speed
B.Increase of engine speed
C.Decrease of compression ratio
D.Increase of compression ratio
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224. Antiknock for compression ignition engines is
A.Amyl nitrate
B.Tetra ethyl lead
C.Ethylene dibromide
D.Napthene
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