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WorksheetsLV07 part 2
Total questions: 30
Worksheet time: 15mins
What is meant by the word flash point when talking about fuel?
The highest temperature at which it will combust
The average temperature at which it will combust
The range of temperature at which it will combust
The lowest temperature at which it will combust
The advantage of a multipoint injection system over a carburettor petrol system is that?
All of the answers given
The quantity of fuel delivered is tightly controlled
It delivers better fuel economy
There is a better atomisation of the fuel
The method used to assess the condition of a turbo charger bearings can be done by?
Measuring the maximum boost pressure with the engine running
Measuring the turbine end float using a DTI gauge
Measuring the turbine housing clearance using feeler gauges
Lifting and spinning the turbine shaft by hand
Piston slap will be worse when the engine is?
At normal operating temperature
Above normal operating temperature
Producing white smoke
Below normal operating temperature
An inductive type engine speed sensor produces?
A PWM signal which varies in length with engine speed
Data bus packets which vary in size with engine speed
A DC voltage which varies in frequency with engine speed
An AC voltage which varies in frequency with engine speed
The communication network system shown in the diagram is called?
Main controller system
Multi ECU system
Pulse width modulation system
Multiplex system
Blow by gasses in the crankcase are removed by the?
PCV system
Evaporation control system
Catalytic convertor
EGR system
A common rail engine will crank but not start. No codes are present in the ECU.
Faulty coolant temperature sensor
Faulty manifold pressure sensor
Blocked fuel filter
Faulty knock sensor
The engine coolant is contaminated by oil in a compression ignition engine. The fault is?
Worn piston compression rings
Internal leakage of the oil cooler
Crankshaft oil seal leaking
Worn piston oil control rings
A common rail engine will start and idle but has a constant misfire. One fault could be?
Faulty spark plug
Faulty airflow sensor
Faulty coolant temperature sensor
Faulty injector wiring
What type of trace would get on an oscilloscope when testing the output from a hall sensor?
Square wave
Sine wave
Saw tooth
Cosine wave
What is the main design feature of the hemispherical combustion chamber?
Only pushrods and rockers can be used
Valves are inclined at about 90 degrees to each other
The valves are side by side
Only overhead camshafts can be used
The mass of air entering an engine is measured by the?
Air temperature and pressure in the intake manifold
Ambient temperature and air temperature in the intake
Piston speed and air temperature in the intake manifold
Speed and volume of air in the intake manifold
A cylinder leakage test could be used to diagnose?
A defective spark plug
Worn crankshaft bearings
A burnt inlet valve
Excessive valve clearance
High tension plug leads have an in-built resistance, the purpose of this is to?
Improve HT strength whilst remaining flexible
Cancel any rogue signals from other HT leads
Suppress radio interference
Reduce the strength of the spark
The function of an engine intercooler is to?
Cool the coolant before it re-enters the engine
Increase the density of the air
Decrease the density of the air
Regulate air flow
Checking for ovality is carried out on?
Crankshaft journals
Timing gears
Cylinder bores
A flywheel
The test carried out on a crankshaft which uses V blocks and a DTI gauge is checking for what?
Twist
Ovality
Wear
Bow
The output signal generated by an inductive type sensor will be a?
Sine Wave
Cosine wave
Variable Capacitance
Square wave
A 2-way catalytic convertor fitted to the exhaust of a compression ignition engine converts?
Hydrocarbons, oxides of nitrogen into sulphur & carbon dioxide
Oxides of nitrogen & hydrocarbons into water & carbon dioxide
Carbon dioxide and sulphur into water and carbon dioxide
Hydrocarbons & carbon monoxide into water & carbon dioxide
The purpose of exhaust gas recirculation is to?
Reduce Carbon dioxide
Improve fuel economy
Reduce carbon monoxide
Reduce combustion temperature
An Inter cooler is used to cool the?
Exhaust gas to increase NOx content
Inlet air to increase its density
Exhaust gas to decrease NOx content
Inlet air to decrease its density
On a car heater system a customer complains of loss of power on slower speeds. What's the fault?
Resistor pack failure
Faulty switch unit
Motor brush failure
Coolant sensor faulty
Which of the following suppression techniques are commonly used in an HT circuit?
Resistors
Capacitors
Inductors
Bonding
What type of trace would be expected on an oscilloscope when testing a hall effect sensor?
Cosine wave
Sine wave
Saw tooth wave
Square wave
Following the replacement of electronic fuel injectors, the vehicle should be tested by?
Carrying out an emissions test line with MOT requirements
Asking the customer to drive it and check for performance
Holding revs at 3000rpm and checking for fault codes
Carry out a road test and check for leaks and fault codes
A spark ignition engine misfires at all engine speeds. One fault could be?
A defective coil pack
Low resistant plug lead
Defective knock sensor
Defective crankshaft sensor
A turbo engine starts and idles but stalls when the revs are increased. One fault could be?
A defective enrichment device
The fins of the intercooler blocked
A blocked air intake
A defective coolant temp sensor
High oil consumption in an engine could be caused by?
Worn crankshaft bearings
Worn compression rings
Worn pressure relief valve
Worn valve stem seals
The starter is rotating but the engine remains stationary. One fault could be?
Worn flywheel ring gear
Low cylinder compression
Open circuit starter solenoid
Open circuit starter relay
