135) The mean effective pressure of a diesel engine having fixed compression ratio will __________ if cut off ratio decreases.

136) The knocking tendency in spark ignition engines may be decreased by

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