In a S.I. engine, when most economical mixture is supplied, the colour of exhaust flame is expected to be

Colour of exhaust flame has nothing to do with the mixture composition

In a S.I. engine, when most economical mixture is supplied, the colour

1.	In a S.I. engine, when most economical mixture is supplied, the colour of exhaust flame is expected to be
A.	Yellow-red to red
B.	Dark red
C.	Bluish, transparent
D.	Dark blue to reddish-yellow
E.	Colour of exhaust flame has nothing to do with the mixture composition
Answer» E. Colour of exhaust flame has nothing to do with the mixture composition