What percentage of engine maintenance and breakdown is related to cooling system maintenance?

• 30%

• 40%

• 50%

• 60%

What is the thermal efficiency formula used in the document?

• Thermal Efficiency = Fuel Energy - Heat Loss

• Thermal Efficiency = Fuel Energy / Heat Loss

• Thermal Efficiency = Heat Loss / Fuel Energy

• Thermal Efficiency = Fuel Energy + Heat Loss

What happens to the rejected heat in a diesel engine?

• It is absorbed by the engine.

• It is transferred to the cooling system.

• It is released into the atmosphere.

• It is stored in the fuel tank.

What does EGR stand for in the context of cooling systems?

• Engine Gas Recirculation

• Exhaust Gas Recirculation

• Emission Gas Reduction

• Energy Gas Recirculation

Why must the cooling system capacity be increased for engines with EGR?

• To reduce noise.

• To handle the additional heat load.

• To improve fuel efficiency.

• To decrease engine size.

What is the significance of cooling exhaust gas from 1200°F to 400°F in engines with EGR?

• To increase fuel efficiency.

• To reduce engine noise.

• To prevent engine damage.

• To improve exhaust emissions.

What is the temperature of the exhaust gas before it is cooled in engines with EGR?

• 1000°F

• 1100°F

• 1200°F

• 1300°F

What is the primary function of the EGR system in an engine?

• To increase engine power.

• To reduce nitrogen oxide emissions.

• To improve fuel economy.

• To decrease engine noise.

Which component is directly affected by the increased heat load due to EGR?

• Fuel injectors

• Turbocharger

• Radiator

• Air filter

How does EGR help in reducing engine emissions?

• By increasing the combustion temperature.

• By recirculating a portion of the exhaust gases back into the intake manifold.

• By reducing the amount of fuel injected.

• By increasing the air intake.