Internal Combustion Engines
Diesel fuel, compared to petrol is

Highly ignitable
Less difficult to ignite
More difficult to ignite
Just about the same difficult to ignite

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Internal Combustion Engines
The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is

Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine
Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine

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Internal Combustion Engines
Pour point of fuel oil is the

It catches fire without external aid
Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
Temperature at which it solidifies or congeals
Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

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