Internal Combustion Engines
The knocking tendency in spark ignition engines may be decreased by

Controlling the air-fuel mixture
Controlling the exhaust temperature
Controlling the ignition timing
Reducing the compression ratio

ANSWER DOWNLOAD EXAMIANS APP

Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

All of these
Ensure that penetration is not high
Inject fuel in a chamber of high pressure at the end of compression stroke
Inject fuel at a high velocity to facilitate atomization

ANSWER DOWNLOAD EXAMIANS APP