Engines: A Comparative Study

What is the typical thermal efficiency of a petrol engine?

• 40% to 50%

• 20% to 30%

• 60% to 70%

• 10% to 15%

How does diesel fuel differ from petrol in terms of energy content?

• Diesel fuel and petrol have the same energy content.

• Diesel fuel has a higher energy content than petrol.

• Petrol has a higher energy content than diesel fuel.

• Diesel fuel has a lower energy content than petrol.

Which type of engine generally produces fewer CO2 emissions?

• Diesel engines

• Gasoline engines

• Hybrid engines

• Electric engines

What are the common maintenance tasks for a diesel engine?

• Brake pad replacement

• Changing spark plugs

• Transmission fluid flush

• Oil changes, fuel filter replacement, air filter inspection, coolant checks, and battery maintenance.

How does the cost of electricity compare to petrol for powering vehicles?

• The cost of electricity and petrol is the same for powering vehicles.

• Electricity is more expensive than petrol for powering vehicles.

• Electricity is only cheaper in rural areas compared to petrol.

• Electricity is usually cheaper than petrol for powering vehicles.

Which engine type typically offers better torque at low RPMs?

• Gasoline engines

• Hybrid engines

• Diesel engines

• Electric motors

What is the primary environmental concern associated with petrol engines?

• Noise pollution from engine operation.

• Greenhouse gas emissions and air pollution.

• Reduced reliance on fossil fuels.

• Increased fuel efficiency compared to diesel engines.

How often do electric vehicles require maintenance compared to petrol and diesel vehicles?

• Electric vehicles have the same maintenance frequency as diesel vehicles.

• Electric vehicles require more maintenance than petrol vehicles.

• Electric vehicles need maintenance only once a year.

• Electric vehicles require maintenance less frequently than petrol and diesel vehicles.

What is the average lifespan of a hybrid engine compared to a petrol engine?

• Hybrid engines generally last longer than petrol engines.

• Both hybrid and petrol engines last the same amount of time.

• Petrol engines last longer than hybrid engines.

• Hybrid engines have a shorter lifespan than petrol engines.

Which fuel type is known for having a higher cetane number?

• Gasoline

• Propane

• Diesel fuel

• Ethanol