Chemical Engineering Basics
For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.

Maximum temperature is higher
Heat rejection is lower
Expansion & compression are isentropic
Combustion is at constant volume

ANSWER DOWNLOAD EXAMIANS APP

Chemical Engineering Basics
Compression ratio of an I.C. engine is the ratio of the

Pressure after compression to that before compression
Volume of air in cylinder before compression to that after compression
None of these
Clearance volume to the volume swept by piston per stroke

ANSWER DOWNLOAD EXAMIANS APP