HV2.2 quiz 6

When carrying out a emissions test

• Vehicle needs to be at operating temperature

• Do it any time

• Do it out side the workshop

• Do it when the engine is half warm

The most common type of fuel injection nozzle is a Pintle

• True

• False

What is the first phase in the fuel injection

• Compression stroke

• Delay period

• Main combustion

• Induction stroke

What happens in the delay period of the injection

• Injected fuel pools in the cylinder

• Al of the answers

• The injector doesn't inject

• Injected fuel absorbs the air

During the emissions test, what is being tested

• The carbon dioxide

• The nox

• The carbon monoxide

• The opacity of the smoke

Intake manifold heating (glow plugs or flame start) is used

• To heat up the cylinder in cold weather

• To heat up the cylinder in warm weather

• To increase volumetric efficiency

• To decrease volumetric efficiency

What does a particulate filter do

• Trap the Nox gases

• Trap water

• Trap the carbon

• Trap argon

How is the pressure generated on a unit injector

• Off a fuel pump

• Off the camshaft

• off the crankshaft

• Of a belt

Why do you need to bleed a fuel system after fitting a new filter

• No reason you just do

• To clean the system

• To remove any fuel in the system

• To remove any air in the system

How is this part driven

• Intake air

• Camshaft

• Crankshaft

• Exhaust gases