Font size
WorksheetsYear 3 Engine
Total questions: 25
Worksheet time: 26mins
What is the correct mixture (Stoichiometric) value?
14.7 parts fuel to 1 part air
14 parts fuel to 1.7 parts air
14.7 parts air to 1 part fuel
14.7 parts nitrogen to 1 part oxygen
What does a Lambda sensor measure?
Oxygen
Hydrocarbons
Carbon
Nitrogen
What is the exhaust part that reduces soot from a diesel engine?
DPF
SCR
Catalyst
What is so good about Piezo-electric injectors?
They do not require high pressure
They do not require pump
They do not need filter
They can give multiple injections
what is the throttle body Assembly position measured by
ECU
Electronic Throttle plate
Idle control device
potentiometer
What is pulse width modulation?
how much fuel comes out of the injector
The period the injector is open
order of each injector opening
all of the above
Which one of the following components is located on the 'high pressure' side of the diesel fuel injection system?
Fuel pump
Fuel tank
Common Rail
Fuel filter
What controls the opening and closing of the fuel injector in an electronically controlled fuel injection system?
It is opened in time with the engine timing directly via the cambelt
It is controlled by electrical signals from the ECU
It is controlled by the in-line fuel filter
It is controlled by the fuel pump in relation to engine timing
Which of the following is a benefit of having a pre-injection phase?
Lower power output
Longer ignition firing delay
Increased exhaust emissions
Lower combustion noise
What is being measured in the image?
The integrity of the oil pan sealing surface
The crankshaft's throw
The crankshaft's radial run-out
The crankshaft's end float
When using Plastigage® to measure radial clearance, what must not be done?
Position the Plastigage® in the center of the bearing
Cover the entire bearing width with Plastigage®
Do not rotate the component
Rotate the component
What is the measurement shown in the image?
3.08mm
3.58mm
8.0mm
3.579mm
Why is it important to ensure that piston rings are offset when installed?
They are easier to install into the cylinder
To prevent blow-by gasses from having a straight path to follow
To prevent too much air from reaching the combustion chamber
They will break during installation if they aren't offset
Pre-ignition is when the spark plug fires too early.
True
False
If ignition occurs too early, engine knock occurs.
False
True
What is most likely to cause low running compression test readings on all cylinders?
Bent rod journals
Burned exhaust valves
Worn cam lobes
Incorrect cam timing
An engine emits blue smoke for a few seconds when starting cold; the MOST likely cause is
Fuel system is too lean
A coolant leak to the cylinder
Worn valve seals
Worn piston rings
A plastigage is used to determine
piston clearance
main and rod bearing clearance
valve spring clearance
crankshaft end play
The turbo uses (a) to cool the air.
What spins a Turbo?
Air inlet
Exhaust gasses
Engine speed
Oil
What lubricates a turbo?
There's no lubrication
Only uses bearings
Oil
Teflon bush
What speed does a turbo spin at?
1000 - 4000 rpm
80,000 - 200,000 rpm
10,000 - 20,000 rpm
300,000 - 600,000 rpm
What term is used for an engine that is not supercharge or turbocharge?
TFSI
TDI
Hydrodynamic
Naturally aspirated
The delay before the turbo cuts in is called?
Lag
Low speed
Wasted air
Power stroke
A supercharger is driven by
Belt
Exhaust gasses
Inlet Air
Oil pressure
