WorksheetsLV02.2 part 1
Total questions: 31
Worksheet time: 16mins
A pulse generator is most commonly found in:
A fuel system
An electronic ignition system
A transmission system
A chassis ECU
Before checking the exhaust emissions of an engine you should:
Check and adjust the tension of the alternator drive belt
Ensure the engine is operating in normal ambient temperatures
Ensure that the engine oil and filter have been changed
Run the engine until it reaches normal operating temperature
In a direct injection compression ignition engine the injector:
Injects the fuel into an ante-chamber
Injects the fuel into the manifold
Is a single hole pintle type design
Injects the fuel into the cylinder
Diesel engines are fitted with a speed limiting device to:
Prevent over revving
Limit fuel pressure
Control injection timing
Reduce particulate emissions
An emissions test shows an excessive amount of Carbon Monoxide. One likely cause of this is:
A defective spark plug
A defective oil pump
Leaking inlet manifold
Leaking exhaust manifold
The term naturally aspirated engine means:
A turbo-charger is used
Air enters the engine at atmospheric pressure
Air enters the engine above atmospheric pressure
A supercharger is used
Octane rating is a property of:
Petrol
Diesel
Brake fluid
Water
In the combustion cycle of a CI (diesel) engine the ‘delay period’ is the:
Crank angle at which the injected fuel burns releasing power
Amount of time that the air in the cylinder is compressed
Crank angle that the fuel is injected into the cylinder
Period before self-ignition when injected fuel absorbs heat
One probable cause of engine misfires at all engine speeds is a:
Blocked air filter
Defective coil
Defective knock sensor
A low resistance plug lead
Which faults would most likely highlight a defective coolant temperature sensor?
Engine juddering and blue smoke
Excessively increased engine power
Engine knocking when under load
Excessive fuel consumption
By increasing the fuel injector pulse width this in turn will:
Lower the injector resistance
Increase the injector resistance
Inject less fuel
Inject more fuel
A hot wire air flow sensor measures:
Air temperature
Throttle position
Airflow mass
Air pressure
An internal combustion engine compresses the intake air greater than atmospheric pressure:
Is turbo-charged
Has a high compression ratio
Incorporates variable valve timing
Is of two-stroke design
Which gas in an EGR system is designed to be reduced?
NOx
CO2
CO
HC
A sequential fuel injection system:
delivers fuel to all the cylinders at once
delivers fuel to each cylinder in turn
delivers fuel through a single throttle body injector
delivers fuel at 5 second intervals
What is meant by the ‘flash point’ of a fuel?
the ability of a fuel to burn at room temperature
the anti-knock index number of a fuel
the critical temperature at which the fuel will ignite
the measure of how quickly fuel vaporises
Cetane rating is a property of:
petrol
diesel
brake fluid
water
Before removing petrol injectors, it is important to:
ensure new pipes are available
check the 'O' rings
depressurise the fuel pipes
drain the fuel tank
On a D.I.S with a coil pack, when a spark occurs on the exhaust stroke it is described as a:
useless spark
redundant spark
pointless spark
wasted spark
Multipoint fuel injection systems have injectors located in the:
cylinder head
inlet manifold
air cleaner
throttle body
The fuel injection system which uses a single injector to spray fuel towards a throttle is:
a single point system
a rotary system
a multi-point system
an in-line system
Exhaust gas products that are NOT harmful in the environment are:
CO2 and H2O
H2O and CO
CO and HCs
HCs and NOx
Direct injection S.I Engine injects fuel into the:
inlet manifold
engine cylinder
air intake
throttle body
An ignition coil contains two windings known as:
primary and secondary
first and second
mutual and inductance
transformer and core
Severely over advanced ignition timing will cause:
running on
pre-injection
isolation
pinking
Engine position and speed is usually determined from a sensor on the:
crankshaft of balance shaft
oil pump drive
cam belt
crankshaft or front pulley
Multipoint fuel injection systems usually have the pressure regulator located:
on the injectors
in the mechanical fuel pump
on the fuel rail
in the air cleaner
Setting spark plug gaps too wide will cause running problems because the firing voltage will:
increase and the spark duration will decrease
increase and the spark duration will increase
decrease and the spark duration will increase
decrease and the spark duration will decrease
Which component is responsible for measuring the amount of air entering the engine?
Mass air flow sensor
Throttle body
Exhaust manifold
Fuel injector
What is the main function of a catalytic converter in an internal combustion engine?
Increase engine power
Reduce harmful exhaust emissions
Regulate engine temperature
Control fuel injection timing
Which fuel property is most important for preventing engine knocking in petrol engines?
Cetane number
Octane rating
Viscosity
Flash point
