Question

Given below are two statements:

Statement I: Emissions of hydrocarbons and carbon monoxide are inherently very low

 from diesel vehicles.

Statement II: Diesel driven vehicles are inherently more fuel-efficient compared to petrol-driven vehicles.

In the light of the above statements. choose the most appropriate answer from the options

 given below:
1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct

Answer 1

Correct Answer - Option 1 : Both Statement I and Statement II are correct

Difference Between Petrol and Diesel Engine
Diesel Engine	Petrol Engine
These engines work on the Diesel cycle	Works on the Otto cycle
The fuel is mixed with air inside the cylinder	Air and the fuel are mixed in a carburettor
Ignition is achieved with the help of the hot, compressed air.	Fuel is ignited with an electric spark
High compression ratio	Relatively low compression ratio
High power production	Relatively low amounts of power are produced in a Petrol engine
These engines work with fuels that have low volatilities	Highly volatile fuels are used in these internal combustion engines
Generally used in heavy vehicles such as trucks and buses	Used in light vehicles such as motorcycles and cars.
Relatively low fuel consumption	High fuel consumption.
High initial and maintenance costs	Comparatively low initial cost and maintenance cost
diesel has higher emissions of NOx and much higher emissions of particulate matter.	In a petrol car, these can be cleaned up by a three-way catalytic converter so that it emits on average around 30% less NOₓ than a diesel car.
diesel cars emit fewer hydrocarbons, carbon monoxide and lead pollution than petrol cars, but produce more noxious gases and significantly more particulates	Produces more hydrocarbon and carbon monoxide
Diesel engines generally achieve greater fuel efficiency than petrol (gasoline) engines.	It has low fuel efficiency.

Conclusion: From the above discussion we come to the conclusion that both the types of engines have their own merits and demerits. But above given both the statements are true regarding diesel and petrol engine. Hence, option (1) is correct.