HV2.2 TEST 4

When carrying out an emissions test, what should be done?

• Do it any time

• Do it outside the workshop

• Vehicle needs to be at operating temperature

• Do it when the engine is half warm

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 for what purpose?

• To increase volumetric efficiency

• To decrease volumetric efficiency

• To heat up the cylinder in cold weather

• To heat up the cylinder in warm weather

What does a particulate filter do?

• Trap the NOx gases

• Trap the carbon

• Trap water

• Trap argon

How is the pressure generated on a unit injector?

• Off the camshaft

• Off the crankshaft

• Off a fuel pump

• Of a belt

What happens in the delay period of the injection?

• Injected fuel pools in the cylinder

• Injected fuel absorbs the air

• The injector doesn't inject

• All of the above

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

• No reason you just do

• To remove any fuel in the system

• To clean the system

• To remove any air in the system

What is the first phase in the fuel injection?

• Induction stroke

• Delay period

• Main combustion

• Compression stroke

What drives a turbocharger?

• Intake air

• Exhaust air

• Boost air

• Compressed air

What is the most harmful gas in the emissions of a CI engine?

• Carbon dioxide

• NOx

• Carbon monoxide

• Hydrocarbon