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WorksheetsLV02.2 part2
Total questions: 46
Worksheet time: 23mins
Which of these fluids is classified as the most flammable?
Engine oil
Coolant
Fuel oil
Brake Fluid
Excessive fuel consumption due to a rich fuel mixture is likely to cause:
Blue smoke from the exhaust
Black smoke from the exhaust
No smoke from the exhaust
White smoke from the exhaust
When tested the emissions of an engine has an excessive amount of CO. One likely cause 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
Cetane rating is a property of:
Petrol
Diesel
Brake fluid
Water
In a direct injection compression ignition engine the injector:
Injects the fuel into the ante-chamber
Injects the fuel into the combustion chamber
Injects the fuel into throttle bodies
Injects the fuel into the manifold
There is a lack of engine power, the exhaust gives off a smelly blue smoke, the likely fault is:
Water in the engine oil
Burnt out exhaust valves
Burnt out inlet valves
Broken piston rings
Diesel engines are fitted with a speed limiting device to:
Prevent over revving
Limit fuel pressure
Control injection timing
Reduce particulate emissions
A loose or dirty battery terminal is likely to cause:
The engine not to start
Poor fuel economy
Engine mis-firing
Lack of pulling power
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:
Amount of time before self-ignition when fuel is injected
The crankshaft angle when the injected fuel is ignited
Amount of time it takes the air in the cylinder to compress
The crankshaft angle when the injector spray fuel in engine
The term forced induction engine means:
An induction kit is used
Air enters the engine at atmospheric pressure
Air enters the engine above atmospheric pressure
Fuel injection is used
Diesel Common Rail Direct Injection fuel pressure is approximately:
180 Bar
180 PSI
1800 Bar
1800 PSI
A Pintle injector is normally found on a:
Wankle engine
SI engine
Super charged engine
CI engine
Which one of these is not part of the fuelling system?
pump
lambda sensor
injectors
filter
Which of these components reduce the amount of nitrogen oxide that is emitted from the exhaust?
catalytic converter
EGR valve
supercharger
back box
The 4 main gasses produced by a spark ignition petrol engine are.
carbon monoxide, hydrocarbons, nitrogen oxide, carbon dioxide
carbon monoxide, hydrogen, nitrogen oxide, carbon dioxide
Carbon dioxide, Nitrous oxide, sulphur oxide, oxygen
carbon monoxide, oxygen, hydrogen, sulphur oxide
Simultaneous injection occurs at different times.
true
false
Which faults create the following colours of smoke?
black (over fuelling) blue (oil) white (coolant)
Blue (coolant) white (oil) Black (over fuelling)
White (over fuelling) blue (coolant) Black (oil)
black (coolant) white (over fuelling) blue (oil)
What does stoichiometric mean?
some of the fuel is burned
there is air pockets in the system
all of the fuel is completely burned
there is no fuel left in the system
Open loop systems include feedback and adjustment.
false
true
What is the perfect air to fuel ratio for petrol?
13.9 to 1
14.7 to 1
8.9 to 1
12.5 to 1
A hot plug has a shorter insulator nose?
true
false
Lambda sensors are part of a closed loop.
true
false
In a multi-point injector system, where are the injectors located?
below the throttle plate
in the chamber
before the throttle plate
High amounts of Carbon Monoxide would be caused by what?
defective oil pump
leaking inlet manifold
a defective spark plug
leaking exhaust manifold
Which one of these metals is present inside a Catalytic Converter?
titanium
platinum
aluminium
copper
Un-burnt fuel may cause the exhaust of a diesel engine to emit...
Water Vapor
Blue Smoke
particulates
hydrogen
The Stoichiometric ratio for Petrol is?
9:1
14:1
15.7:1
14.7:1
What sensor will give this waveform?
Cam Sensor
Fuel Level Sensor
Engine Coolant Temperature Sensor
Lambda Sensor
Why is a post-cat Lambda Fitted?
To measure the HC's after the Cat
To Measure the NOx after the Cat
To check the Cats efficiency
to warm up the engine faster
0.97 Lambda is this....
Lean AFR
Rich AFR
Perfect AFR
What Fuel Injection System is b)?
Throttle Body Injection
Single Point Injection
Multipoint Direct Injection
Multipoint Indirect Injection
A Turbo Charger is driven by What?
Exhaust Gas
crankshaft
camshaft
Electronic Motor
A distributor type ignition system can use which type of switching?
Hall Effect
optical
Contact Beaker
all of the options listed
The ignition 'dwell angle' is the period during which...
no current is flowing
Piston reaches TDC
a magnetic field is building inside the coil
the ignition coil fires a spark
A forced induction engine has a volumetric efficiency of..
under 100%
89%
over 100%
90-100%
Secondary air injection helps lower levels of
CO HC
noise
CO HC NOx O2 CO2
temperature
What % of Oxygen makes up the atmosphere?
19%
21%
79%
78%
What purpose does the Wastegate have on a Turbo?
limits maximum boost pressure
Improves V.E
slows down exhaust gas velocity
cools down turbo when overheating
Octane rating is a property of?
diesel
petrolium
brake fluid
water
Catalytic converters are used to convert...
CO, NOx and HC to CO2, H2O and N2
O2 and HC to CO, H2O and NOx
CO2 and N2 to H2O, CO and NOx
CO2, CO, Pb and CO2 to CO2
Before checking the exhaust smoke of a compression ignition engine you should
check alternator belt tension
engine is at operating temperature
Check Turbo bearings
ensure there is a fuel tank of fuel
When removing and refitting an exhaust or air system component, it is important to
wear a hard hat
Risk assess and wear the correct PPE before starting
Wear Goggles
work on it after a road test
A blocked air filter is likely to cause
High CO
High HC's
High N2
high 02
A pulse generator is most commonly found in
an electronic ignition system
a chassis ECU
a transmission system
a fuel system
