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WorksheetsIMI FINAL REVISION FOR LV02 LV03
Total questions: 112
Worksheet time: 56mins
Oxygen makes up approximately how much of the atmosphere?
23%
"24%
21%
31%
Air pollution comes from ?
Factories
Transportation
Forests
Oil refineries
Evaporated emissions create?
CO
CO2
HC
NoX
A chemically correct AF ratio is also termed?
Stoichiometric
Lambda 1
Pascal
Zirconium
An over rich mixture can create
Cause black smoke
High fuel consumption
Strong smell of fuel
Hot engine
NoX is formed when the combustion temperature rises above 1300 degrees C. What makes a big difference to the chamber temperature.
Ignition timing
Engine load
Lean fuel mixture
NoX is measured in?
Parts Per Million
Percentage
Milligrams
CCs
To create the least amount Hydrocarbons the engine runs?
Too Rich
correct
Too lean
Running the engine lean can result in
High combustion temperatures
Poor performance
Piston damage
Poor fuel consumption
NoX is produced when an engine is under
Light load
Warm up
Heavy load
Idling
The catalytic converter starts to work at?
350 + degrees C
750 + degrees C
150 degrees C
Ambient Temperature
A lean mixture will read
300mv
200mv
5 volts
800mv
800mv will make the injectors open for
longer
the same
shorter
stop
Oxygen sensors are made of
platinum
zirconium
gold
silver
Another name for an oxygen sensor is
Lambda
O2
HEGO
when a piston is at TDC at the end of the exhaust stroke it will be at the
top of the cylinder with the inlet and exhaust valves completely closed
top of the cylinder with the inlet and exhaust valves fully open
top of the cylinder with the inlet and exhaust valves partially open
bottom of the cylinder with the inlet and exhaust valves completely closed.
which one the following is checked by heating a small amount of brake fluid ?
moisture content
fluid specification
air in the system
age of the fluid
what action needs to be carried out after replacing a filter in a CI engine fuel system?
it should be filled with petrol
it should be filled with air
it should have all air removed
it should have all diesel fuel removed
On first starting an engine with new oil and filter, the technician should make sure the engine oil
Pump is primed and vented
Warning light extinguishes
Reaches the camshaft drive belt
Is allowed to change color before reviewing
when checking the engine oil level the vehicle must be on level ground and
the engine switched off and checked a short time after
running at idle speed
switching off and checked immediately
running above 3000 rev/min
what will using a higher viscosity specification oil in a diesel (CI) engine result in?
poor starting in cold weather
higher idle speeds
increased performance
improved fuel consumption
which one of the following would be identified by a visual inspection of the brake pads?
possible overheating during braking
the asbestos content
warped brake disc
incorrect ABS operation
Which one of the following is a method of testing coolant for its frost protection
Pressure gauge
Hydrometer
Torque wrench
Frosty gauge
why do cambelts require replacing at a specified mileage?
to ensure valve clearance remain constant
to reduce camshaft wear
to prevent damage to the engine
to improve engine performance
Before removing the cap radiator ,what must a technician do?
allow the engine cooling system to cool down
remove the ignition keys
use a suitable container to catch the excessive coolant
ensure the correct cap is fitted
which one of the following is a steering service item?
steering wheel height adjustment
steering air bag re-charge
excessive linkage free
play king pin re-alignment
what action should be taken with brake shoes that have become contaminated with brake fluid?
they must be cleaned with brake cleaner
they must be replaced with new ones
they must be refitted after being exposed to air for 24 hours
they must be heated with a flame and cleaned with brake cleaner
On a coil per plug system the ignition coils are situated on the
Distributor cap
King leads
Spark plug
Battery
An internal combustion engine turns (a) into energy
What are the four strokes called in a four stroke engine?
Intake, compression, exhaust, cleaning
Exhaust, diesel, complication, cleaning
Intake, compression, combustion, exhaust
Petrol, spark, explosion, exhaust
Which part of an engine turns as a result of the combustion of the fuel, and hence powers the other parts of the vehicle?
Camshaft
Crankshaft
Piston
Valve
There are usually two valves in a four stroke engine, an intake valve and an exhaust valve
True
False
Which stroke provides the power that actually turns the crankshaft?
Combustion
Compression
Exhaust
Intake
The timing belt is necessary to make sure the valves open and close at the right points in the pistons' movements
True
False
An anti- roll bar is also known as :
a control arm
a sway bar
torsion bar
trailing arm
This component absorbs bumps in the road to help prevent driver feel.
rotor
leaf spring
shock
sway bar
Name this component
radius arm
control arm
strut
steering rack
Name this component
strut
shank
shock
Name this component
u bolt
leaf spring
sway bar
torsion bar
Name this component
Strut
shock
coil spring
damper
The automotive suspension system interacts very closely with the steering system.
True
False
Tech A says that loose ball joints can cause the vehicle to wander. Tech B says that loose control arm bushings can affect alignment angles. Who is correct?
Tech A
Tech B
Both A and B
Neither A nor B
Choose the purpose of the braking system.
The braking system is designed to help you do smoky burnouts
The braking system is designed to decrease the speed of the vehicle.
The braking system is designed to prevent you from driving to fast.
The braking system is designed to stop you from driving into the car in front of you
Which of the following is not part of the disc brake system
Brake rotor
Brake caliper
Brake Shoe
Brake pad
What does the acronym ABS stand for?
All Brakes Stopping
Awesome Braking System
Anti-lock Braking System
Advanced Braking System
Select appropriate answer for the image given
Drum Brake Part
Disc Brake part
Select appropriate answer for the image given
Drum Brake Part
Disc Brake Part
What does the braking system use to reduce the speed of a vehicle?
grease
speed
friction
torque
What converts fluid pressure to mechanical motion
caliper
brake shoe
rotor
brake pad
What is this part?
Wheel stud
Wheelcylinder
Wheel bearing
Starter
Which Greek letter is used to represent the coefficient of friction
Pi (π)
Mu (μ
Delta (Δ)
Omega (Ω)
What can the driver do to reduce the possibility of brake fade caused by heat?
Pump the brake pedal while descending a steep hill
Shift the transmission into neutral and allow the vehicle to coast down long or steep hills
Ride the brakes to keep the shoes and pads against the drum or rotor
Select a lower transmission gear
Which of the following is a form of steering mechanism?
Ackermann steering
Peg and Ball
Crown wheel and pinion
Rack and pinion
To satisfy the MOT regulations the minimum braking efficiency for the footbrake must not be:
less than 16%
less than 25%
less than 50%
less than 75%
In relation to checking and adjusting the front wheel alignment which of the following is NOT true?
Adjustments must be made equally to both track rods
You should remove any very heavy loads from the boot
You should check the tyre pressures are correct
Buckled wheels will not affect the wheel alignment
An offside brake caliper piston seized in the off position may cause the:
vehicle to pull to the right when accelerating
vehicle to pull to the right when braking
vehicle to pull to the left when accelerating
vehicle to pull to the left when braking
In relation to vehicle behaviour during cornering 'oversteer' is when the:
slip angles of the rear tyres are smaller than the slip angles of the front tyres
slip angles of the rear tyres are larger than the slip angles of the front tyres
slip angles of the front tyres are the same as the slip angles of the rear tyres
rear wheels of a vehicle are carrying much less load than the front wheels
A driver complains of steering wheel 'shimmy' that gets worse as the vehicle's speed increases. This most likely indicates the:
tyre pressures are too high
front wheels need balancing
wheel alignment needs adjusting
shock absorbers need replacing
The Ackermann steering layout produces:
toe-out of the front wheels during cornering
understeer of the front wheels during cornering
oversteer of the front wheels during cornering
centre point steering on the front wheels
A customer complains that their vehicle pulls to the left during braking. One possible cause of this fault is:
the front wheel alignment is incorrectly set with excessive toe-in
the brake servo has failed due to a collapsed induction manifold pipe
seized front brake caliper pistons on the offside of the vehicle
seized front brake caliper pistons on the nearside of the vehicle
The legal limit for a car tyre tread depth is::
1 mm across 75% of the tyre width
1 mm across 100% of the tyre width
1.6 mm across 75% of the tyre width
1.6 mm across 100% of the tyre width
A vertical movement of the body at the front then the back in turn is called:
roll
bounce
pitch
sway
In relation to vehicle behaviour during cornering ‘understeer’ is when the:
slip angles of the rear tyres are smaller than the slip angles of the front tyres
slip angles of the front tyres are larger than the slip angles of the rear tyres
slip angles of the front tyres are the same as the slip angles of the rear tyres
rear wheels of a vehicle are carrying much less load than the front wheels
A constant velocity joint is used:
in a front wheel drive shaft
in a dead axle
in a fully floating axle
in a live axle
The ABS operating phases are controlled by:
Boden cables
electronic solenoids
engine speed
mechanical linkages
What is the nominal section width of a tyre with the following markings 205/45/17 84W?
17 inches
45 mm
84mm
205 mm
Explain the operation and construction of single-point injection systems.
The operation of single-point injection systems involves delivering air to the engine instead of fuel.
The single-point injection system operates by delivering fuel to the engine through a single injector located in the intake manifold.
The single-point injection system operates by delivering fuel to the engine through multiple injectors located in the exhaust manifold.
The construction of single-point injection systems involves using a carburetor instead of an injector.
What are the types of air flow sensors used in petrol injection systems?
MAF and MAP sensors
Oxygen and Nitrogen sensors
Temperature and Pressure sensors
Speed and Acceleration sensors
Describe the fuel supply system in a multi-point injection system.
Fuel pump delivers fuel to the exhaust system
The fuel supply system is not important in a multi-point injection system
Fuel is delivered to the spark plugs
Fuel pump delivers fuel to the injectors
Explain the function of a fuel pump in a petrol injection system.
Providing lubrication to the moving parts of the engine
Regulating the temperature of the engine
Mixing air and fuel to create combustion
Delivering fuel from the fuel tank to the engine at the correct pressure and flow rate.
What is the purpose of a fuel filter in an injection system?
To increase the fuel efficiency
To regulate the engine temperature
To improve the exhaust system
To remove contaminants and impurities from the fuel
Describe the role of a fuel regulator in a petrol injection system.
Regulates air pressure to the engine
Monitors exhaust emissions
Controls the temperature of the fuel
Controls fuel pressure to ensure correct amount of fuel is delivered to the engine
Explain the function of injectors in a multi-point injection system.
Regulating the temperature of the engine
Controlling the exhaust emissions
Mixing air and fuel in the intake manifold
Delivering fuel to each individual cylinder in a multi-point injection system.
What is the significance of a sequencer in a petrol injection system?
It is only used for diagnostic purposes.
It has no impact on the performance of the petrol injection system.
It controls the timing and sequence of fuel injection into the engine cylinders.
It increases the fuel consumption of the engine.
Differentiate between single-point and multi-point injection systems.
Single-point injection systems use a single injector to supply fuel to all cylinders, while multi-point injection systems use individual injectors for each cylinder.
Single-point injection systems use individual injectors for each cylinder, while multi-point injection systems do not use injectors at all.
Single-point injection systems use a single injector for each cylinder, while multi-point injection systems use individual injectors for each cylinder.
Single-point injection systems use individual injectors for each cylinder, while multi-point injection systems use a single injector to supply fuel to all cylinders.
Discuss the advantages and disadvantages of single and multi-point injection systems.
Multi-point injection systems offer less precise fuel delivery
Single-point injection systems are more expensive and complex
Single-point injection systems offer better fuel distribution and improved performance
Advantages of single-point injection systems include lower cost and simpler design, while disadvantages include less precise fuel delivery. Multi-point injection systems offer better fuel distribution and improved performance, but they are more complex and expensive.
What is the role of a throttle body in a petrol injection system?
It controls the amount of air entering the engine
It regulates the fuel pressure
It filters the fuel before it enters the engine
It cools down the engine
How does a petrol injection system improve engine performance?
By increasing the engine's exhaust emissions
By delivering fuel at the correct pressure and flow rate for optimal combustion
By reducing the engine's fuel consumption
By cooling down the engine
What is the function of an oxygen sensor in a petrol injection system?
It measures the level of oxygen in the exhaust gases to ensure optimal fuel combustion
It regulates the fuel pressure
It filters the fuel before it enters the engine
It cools down the engine
What is the role of a fuel pressure regulator in a petrol injection system?
It controls the amount of air entering the engine
It regulates the fuel pressure to ensure the correct amount of fuel is delivered to the engine
It filters the fuel before it enters the engine
It cools down the engine
How does a multi-point injection system improve engine performance compared to a single-point injection system?
By delivering fuel at the correct pressure and flow rate for optimal combustion
By reducing the engine's fuel consumption
By increasing the engine's exhaust emissions
By delivering fuel to each individual cylinder, allowing for more precise control over fuel distribution
What is the function of a Mass Air Flow (MAF) sensor in a petrol injection system?
It measures the level of oxygen in the exhaust gases to ensure optimal fuel combustion
It regulates the fuel pressure
It measures the amount of air entering the engine, which is used to calculate the correct amount of fuel to inject
It cools down the engine
What is the role of a Manifold Absolute Pressure (MAP) sensor in a petrol injection system?
It measures the level of oxygen in the exhaust gases to ensure optimal fuel combustion
It regulates the fuel pressure
It measures the pressure in the intake manifold, which is used to calculate the correct amount of fuel to inject
It cools down the engine
How does a petrol injection system contribute to reducing exhaust emissions?
By increasing the engine's fuel consumption
By delivering fuel at the correct pressure and flow rate for optimal combustion, reducing unburnt fuel in the exhaust
By reducing the engine's fuel efficiency
By heating up the engine
What is the function of an Electronic Control Unit (ECU) in a petrol injection system?
It controls the amount of air entering the engine
It regulates the fuel pressure
It filters the fuel before it enters the engine
It manages the fuel injection process based on sensor inputs to optimize engine performance
What is the role of a fuel rail in a petrol injection system?
It controls the amount of air entering the engine
It regulates the fuel pressure
It distributes fuel to the injectors
It cools down the engine
How does a petrol injection system maintain fuel efficiency?
By increasing the engine's exhaust emissions
By delivering fuel at the correct pressure and flow rate for optimal combustion
By reducing the engine's fuel consumption
By cooling down the engine
What is the function of a throttle position sensor in a petrol injection system?
It measures the level of oxygen in the exhaust gases to ensure optimal fuel combustion
It regulates the fuel pressure
It measures the position of the throttle, which is used to calculate the correct amount of fuel to inject
It cools down the engine
What is the fuel supply pressure for a Single Point Injection system?
2 bar
1 bar
0.5 bar
1.5 bar
Compared to multi-point systems, what is a noted advantage of Single Point Injection systems?
Higher efficiency
More complex design
Lower production costs
Higher fuel supply pressure
What is the fuel supply pressure range for the system described in the image?
1-2 bar
2-3 bar
3-4 bar
4-5 bar
According to the image, how many injectors are there per cylinder in the described system?
One injector per cylinder
Two injectors per cylinder
Three injectors per cylinder
Four injectors per cylinder
What does the acronym MAF stand for in the context of air metering devices?
Manifold Air Flow
Mass Air Flow
Metered Air Flow
Maximum Air Flow
What does "Pinking" refer to in engine terminology?
A type of engine oil
A method of cleaning engine parts
Abnormal combustion
A color indicator for engine temperature
What type of actuator is used on a remotely switched fuel flap release?
A motor and gear actuator
A pneumatic motor
A stepper motor
An electric solenoid
What device is used to control the duration of the heater systems operation?
A regulator and a relay
A relay and timer
A thermistor and relay
A relay and resistor
What electrical unit is used to control the power flow in the circuit?
A regulator
A diode
A relay
A thyristor
When testing a suspected faulty door actuator, what would you expect to find on the two activation wires when the central locking is active?
Both showing an earth
Both reading 12 volt
12 volts and an earth
0 Ohms
In modern, heavy commercial vehicles what is the most common use for LED lighting?
Side marker lights
Headlight low beam
Front driving lights
Front fog lights
What is the purpose of a power capacitor in a higher power amplifier system?
To act as a second power source for the amplifiers if the vehicle battery fails
To keep the amp supply to the amplifiers at a pre-set level in all conditions
To prevent damage to electronic amplifier control systems in a power failure situation
To provide a constant voltage to the amplifiers under all conditions
What causes an element to get hot?
The magnetic field that forms around the element when current flows
The elements resistance to the flow of electrical current
The higher voltage produced by the alternator when the screen heater is operated
The glasses resistance to the flow of electrical current
The door lock actuators are wired in:
parallel
series then parallel
parallel then series
series
What is the name of the component in an alternator that converts AC to DC?
Regulator
Stator
Rectifier
One way clutch
Before carrying out any repairs on an airbag system, what must you do?
Disconnect the battery and start work straight away
Leave the battery connected and remove the ignition keys for 15 minutes
Disconnect the battery and wait for at least 15 minutes
Disconnect the battery and wait for at least 5 minutes
What is the function of the Clock Spring?
To measure the time difference between the triggering of the two SRS sensors
To prevent premature wear and breakage of the wiring to the steering wheel
To enable the correct timing of the seat belt pre-tensioner and the airbag
To allow the wiper controls to operate when turning the steering wheel
Why is the airbag coated with a fine powder?
To provide lubrication to reduce friction when the airbag is being installed
To provide lubrication to reduce friction when the airbag is inflating
It is to stop occupants being burnt by the hot gases in the airbag
It is a by product of the gas generant burning process
On a SRS system with an Airbag and Seatbelt Pre-tensioner what will be occurring from 20-30 milliseconds after impact?
Driver hits the bag and the pre-tensioner releases
Airbag is inflated and the pre-tensioning is complete
Airbag collapses and normal seatbelt function occurs
Airbag starts to inflate and pre-tensioner moving
What electrical component has a low resistance to flow in one direction and a high resistance (preferably infinite) to flow in the other direction?
A fuse
A diode
A circuit breaker
A resistor
What electrical principle causes an electrical motor to stop immediately?
Regenerative braking
Electro-magnetic induction
Electro-motive force
OHMs Law
What component in a vehicle's electrical system is primarily responsible for storing electrical energy?
Battery
Alternator
Capacitor
Coil
What is the primary function of an alternators regulator?
To charge the battery
To control the alternators current output
To control the alternators voltage output
To convert the current from AC to DC
