The elements of most concern in regard to pollution caused by engines are
One of the major exhaust emissions from Cl engines compared to SI engine is
Select the correct statements among the following:
1. Decrease in air - fuel ratio in SI engines results in increase of CO and UBHC.
2. NOx emission is maximum in SI engines when the air - fuel ratio is nearly stoichiometric.
3. NOx emission in SI engines will be lowest during idling.
Photochemical smog is mainly due to
NO2 + energy from sunlight → NO + O + Smog
Which of the following catalyst material promotes the reaction of NOx ?
The catalyst materials most used in catalytic converter are platinum, palladium, and rhodium. Palladium and platinum promote the oxidation of CO and HC. Rhodium promotes the reaction of NOx.
Alcohol is the major source for the emission of
Major emission problem when alcohol fuel is used is generation of aldehydes, an eye and respiratory irritant.
Blue smoke in diesel engines indicate
Thermal converter cannot reduce emission of
Efficient operation of catalytic converters require maintenance of
2. equivalence ratio
4. direction of exhaust flow
Q. Select the correct statements from above:
EGR is the most effective way of reducing emission of