Internal Combustion Engines
The two reference fuels used for cetane rating are

Cetane and tetra ethyl lead
Cetane and iso-octane
Cetane and alpha-methyl naphthalene
Cetane and normal heptane

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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

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

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