List two types of super charges. What is the difference between Natureal espired engine and forced induction.

Here are the answers to your questions:

1. A speed control lever (part of the governor) on an external fuel pump (like a fuel injection pump) is used to set the desired engine speed. The governor then maintains this speed by adjusting the fuel supply to match the load, preventing over-speeding or stalling.

2. Filters (fuel, oil, air) are important to the system because they remove contaminants that could cause wear, damage components, or hinder efficient operation. They ensure clean fuel for combustion, clean oil for lubrication, and clean air for the engine.

3. • The primary function of fuel injection is to deliver a precisely metered amount of fuel into the engine cylinders at the correct time and pressure for efficient combustion.
   • The three main functions of a governor unit in a fuel injection pump are:
     1. Idle speed control: Maintains a stable minimum engine speed.
     2. Maximum speed control: Prevents the engine from over-speeding.
     3. Load-speed control: Adjusts fuel delivery to maintain desired speed under varying loads.

4. Two types of governors that can be fitted to an inline fuel injection pump are:

   1. Mechanical governor
   2. Pneumatic governor

5. "Phasing and calibration" in relation to a fuel injection pump refers to:

   • Phasing: Ensuring that each plunger delivers fuel at the correct crank angle relative to the others, matching the engine's firing order.
   • Calibration: Adjusting the fuel delivery quantity from each plunger to be equal across all cylinders at various engine speeds and loads.

6. The main advantage of a rotary fuel injection pump is that it is more compact, lighter, and typically less expensive than an inline pump. It also offers precise fuel metering and timing control.

7. • The purpose of idling control is to maintain a stable, low engine speed when the vehicle is stationary and not under load, preventing the engine from stalling.
   • The purpose of cold starting is to provide additional fuel (enrichment) and/or adjust ignition timing during cold engine starts to ensure the engine fires up quickly and runs smoothly.

8. Exhaust noise is primarily caused by the rapid expansion and high velocity of hot exhaust gases as they exit the engine cylinders and interact with the atmosphere, creating pressure waves.

9. The purpose of a catalytic converter is to reduce harmful pollutants in exhaust gases by converting them into less toxic substances through chemical reactions.

10. The noble metals used as catalysts in a catalytic converter are Platinum, Palladium, and Rhodium.

11. Two noxious gases emitted which are converted by a catalytic converter are:

    1. Carbon Monoxide (CO)
    2. Nitrogen Oxides (NOx)

12. The main advantage of turbocharging over supercharging is that a turbocharger uses waste exhaust gases to drive its turbine, making it more fuel-efficient as it recovers energy that would otherwise be lost. A supercharger is mechanically driven by the engine, consuming engine power.

13. The purpose of intercooling is to cool the compressed air from a turbocharger or supercharger before it enters the engine cylinders. Cooling the air increases its density, allowing more oxygen to enter the cylinders, which leads to more power and reduces the risk of pre-ignition.

14. The purpose of a wastegate in a turbocharged engine is to regulate the boost pressure by diverting a portion of the exhaust gases away from the turbocharger's turbine. This prevents over-speeding of the turbocharger and excessive boost pressure.

15. Two types of superchargers are:

    1. Roots-type supercharger
    2. Centrifugal supercharger

16. The difference between a naturally aspirated engine and forced induction is:

    • A naturally aspirated engine relies solely on atmospheric pressure to draw air into its combustion chambers.
    • A forced induction engine uses a mechanical device (like a turbocharger or supercharger) to compress and force more air into the combustion chambers, thereby increasing power output.