High Pressure Fuel Systems

High fuel system pressurization is required to __________.

Select one:

• Overcome high cylinder pressures

  .

• Overcome short time for combustion process

• Produce fine atomization

• All of these are correct

Which engine system is the most expensive to manufacturer?

Select one:

• Turbo charging

• Fuel system

• Valve train

• Cooling system

Increasing fuel atomization injection pressures promotes __________.

Select one:

• Increased fuel economy

• Lower cylinder pressure

• Lower cylinder heat

• Less air required for combustion

Technician A says an electronic governor in a high-pressure injection system is software-based. Technician B says an electronic governor in a high-pressure injection system controls the injection of a precisely metered amount of fuel and also adjusts injection timing and injection rate. Who is correct?

Select one:

• Tech A

• Tech B

• Both Techs

• Neither Tech

Technician A says idle adaptation involves making adjustments to injection quantities based on changes to crankshaft speed produced during every power impulse. Technician B says most engines built since 2002 generally enable adaptive balance to take place throughout the engine's entire operating range. Who is correct?

Select one:

• Tech A

• Tech B

• Both Techs

• Neither Tech

Evaluation of injector performance by performing a cylinder cut-out test may be evident by viewing __________ data.

Select one:

• Camshaft rotation

• Crankshaft rotation

• Injector stroke

• Injector speed

Higher combustion pressures multiplied by the length of the crankshaft throw equals higher   __________.

Select one:

• Horsepower

• Torque

• Engine RPM

• All of these are correct.

Technician A says to adjust for the variation in combustion time as engine load changes, the fuel system must have the capability to adjust injection timing based on fuel delivery quantities. Technician B says that under load, fuel systems should advance the injection timing. Who is correct?

Select one:

• Tech A

• Tech B

• Both Techs

• Neither Tech

Retarded engine timing will __________.

Select one:

• Reduce particulate emissions

• Reduce oxides of nitrogen emissions

• Decrease intake manifold pressure

• Increase combustion noise

Which one of the following is the timing strategy used for cold start conditions?

Select one:

• Retard engine timing

• Maintain engine timing

• Advance engine timing

• None of these is correct.