137) In a two stroke engine, the working cycle is completed in two revolutions of the crankshaft.

138) A reactor capable of converting a fertile material into fissile isotopes is called regenerative reactor.

139) Alpha-methyl-naphthalene (C₁₁ H₁₀) has a cetane number of

140) In a petrol engine, the mixture has the lowest pressure at the

141) Which of the following does not relate to a spark ignition engine ?