Flash point of fuel oil is
A) minimum temperature to which1 oil is heated in order to give off inflammable vapours in Sufficient quantity to ignite momentarily when brought in contact with a flame
B) temperature at which it solidifies or congeals
C) temperature at which it catches fire without external aid
D) indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
Correct Answer:
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Q13: Paraffins have molecular structure of
A)chain saturated
B)chain unsaturated
C)ring
Q14: Hydrocarbons are decomposed into smaller hydrocarbons by
A)reforming
B)refining
C)cracking
D)polymerization
Q15: The molecular structure of the straight-run gasoline
Q16: For SI engines fuels most preferred are
A)aromatics
B)parafins
C)olefins
D)napthenes
Q17: For CI engine fuels most preferred are
A)napthenes
B)paraffins
C)olefins
D)aromatics
Q18: Octane number of iso-octane is
A)0
B)30
C)60
D)100
Q19: Ignition quality of diesel fuel is indicated
Q21: Gasohol is a mixture of
A)90% ethanol +
Q22: Stoichiometric air-fuel ratio of petrol is roughly
A)50:1
B)25:1
C)15:1
D)1:1
Q23: Venturi in the carburetor results in
A)decrease of
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