During which condition of the vehicle does NOx emission in SI engine will be lowest?

A. Unburnt oil

B. HC

C. Nox

D. CO

A. More prone for knock

B. It uses an overall rich mixture

C. It has a lot of throttling losses

D. It has multi-fuel capabilities

A. To reduce the emission

B. To increase the power output

C. To increase the power efficiency

D. To improve cold-weather starting

A. Methane

B. Ethane

C. Butane

D. Propane

A. It is a rotary external combustion engine

B. It is more expensive

C. It has a longer operating cycle

D. It has less time to complete the combustion

A. Speed and torque

B. Speed and power

C. Torque

D. Speed