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WorksheetsEngines3 o7
Total questions: 32
Worksheet time: 16mins
When the minimum allowable down to Gudgeon pin is fitted to the maximum allowable diameter small ambush what would the clearance be.
Gudgeon pin -diameter 20.05 and tolerance is -0.003
Small end bush 20.05 tolerance+0.005 to -0.010
0.008
0.013
0.035
0.100
Service repair records need to be kept up to date because
A. The bonuses to workers may be compromised
B warranty work can only be carried out after service /repair records are consulted.
The person who compiled the records will have difficulty keeping information in sequence.
The compilation of records is difficult
A vehicle being road tested to identify a fault must comply with which guidelines?
A. The Highway Code
B. The MOT testers manual
C. The highway agency code of practice
D. The department of transport road and regions regulations.
The amount of Labour time available in a repair department working day would be reduced by
A. Over staffing
B. good departmental house keeping
C. Work carried over from the previous day
D.jobs being completed in less than the target time.
One factor which increases the time allowed for a repair department job is:
A. Rusted and corroded threads
B. Technicians rest periods
C. Excessive overheads
D. Technicians awaiting equipment
6. The effect of under tensioning a camshaft drive belt is that the
A. Water pump bearing life will be reduced
B. Chain or cam belt may slip and cause internal engine damage
C. Camshaft drive gear may shear causing major engine damage
D. Belt and driveline will be under excessive strain and will wear prematurely
7. What is the purpose of the Pressure relief valve on a turbocharger
A. A thermostat
B. A map sensor
C. To govern idle speed
D to prevent over boost
8.
It is necessary to have a gap in a piston ring in order to
A. Reduce oil drainage
B. Allow for contraction
C. Allow for expansion
D. Reduce blow by.
If a compression test reading remains low after oil is poured into the cylinder, the most probable
A. Worn piston rings
B. Worn cylinder bores
C. Valves are not seated correctly
D. Worn valve guide bushes
The purpose of the piston oil control ring is to
A. prevent any oil adherence to the cylinder wall
B. Allow oil to pass the compression rings
C. Deliver the oil supply to the Gudgeon pin
D. Control lubrication
11. Which one of the following faults can be confirmed by use of a cylinder leakage tester?
A. Worn oil control rings
B. Head gasket leaking between adjacent cylinders
C. Leaking seals at the bottom of a wet liner engine
D. radiator matrix
12. The existence of oil emulsion in the coolant indicates.
A. Worn compression rings
B. worn oil control rings
C. Crankshaft oil seal leakage
D. Cylinder head gasket failure
13. One cause of excessive pressure in a liquid cooling. System on a running engine is
A. The coolant additive is beyond service life
B. Internal leaks from the cylinder head gasket
C. An air leak into cooling system
D. The coolant contaminated with oil
14. Which of the following would be measured when testing the output from a Hall effect trigger mechanism?
A. AC voltage
B. DC voltage
C. Variable resistance
D. Sine wave output
15. In an electronic ignition using a Hall effect vane switch, which of the following positions should be checked using a volt meter?
A. Zero and negative
B. Zero and earth
C. Earth and negative
D earth and positive
16. A high resistance in a primary winding of an ignition coil will result in a
A. Burnt out coil
B. Breakdown in the secondary circuit
C. Higher spark voltage
D. Reduction in the coil current
17. A reading of 0.00 Ohms is obtained on meter being used to test the primary winding of and ignition coil. This indicates that the coil is
A.is in a serviceable condition
B. Has an open circuit in the winding
C. Has a short circuit in the winding
D. Has a high resistance
18. The illustration shows a fuel pressure regulator, if the connection to the intake manifold becomes restricted the engine will
A. Overheat
B. Overcool
C. Run lean
D. Run rich
19. In an electronic fuel injection system direct measurement air mass flow differs from pressure sensor in because it detects.
A. Air temperature quickly and accurately
B. Air speed 50 times a second
C. Air mass flow 50 times a second
D. Air mass flow quickly and accurately
20. Electrical supply from the fuel pump relay may contain a bypass ballast resistor for use when cranking to
A. Ensure sufficient high supply voltage is maintained
B. Avoid current overload on the fuel pump
C. Ensure sufficient volt drop on cranking only
D. Avoid a voltage drop on the pump relay
21. In a petrol injection system, the greatest injector pulse time occurs during
A. Engine run
B. Idle speed
C. Maximum engine speed
D. maximum engine torque.
22. If the spring breaks in a fuel pressure regulator this will cause
A. Over cooling
A. Over cooling
B. Poor starting
C. high hydrocarbons
D. Increased injection timing
23. Black smoke from a diesel can be caused by
A. Under calibration
B. A faulty lift pump
C. Needle back leakage
D. Blocked injector spray holes
24. One piece of equipment used to identify a faulty injector on a diesel common rail injection system is a
A. Pyrometer
B. Pressure tester
C. Flow meter
D. Vacuum gauge
25. Black smoke issuing from a Diesel engine when running at full load only is most likely caused by an incorrectly adjusted
A. minimum
B. Maximum speed stop
C. Maximum fuel stop
D. Minimum fuel stop
26. In relation to diesel fuel the term cetane rating refers to the
A. Viscosity
B. Volatility
C. Ignition quality/ability to burn
D. the anti-waxing
27. Following adjustment to the phase angle of an in-line diesel injection pump, prior to the prior to rotating the camshaft it is essential to check the.
A. Calibration
B maximum fuel setting
C. Automatic advance operation
D plunger head clearance
28 an engine management control unit switch off the air conditioning system when the throttle is opened quickly in order to
A. Allow the cooling fans to cut in and maintain radiator temperature
B. Provide additional air supply from the air trunking to the manifold
C. Allow the compressor and system to depressurise
D. Cut off the compressor, allowing for maximum power output from the engine
29. What is the purpose of the wire marked X in the diagram
A. Link both sensors
A. Link both sensors
B. Prevent electromagnetic interference
C provide back up if the sensor fails
D. Provide an earth path for the
30. The temperature sensor fails on an engine management system fitted with a fixed range of substitute values for the sensor. The control unit will
A. Normal temperature signal
B. Cold temperature signal
C. High range speed signal
D. Low range speed signal
31. An engine would be prevented from running by failure of the
A. Barometric sensor
B. lambda sensor
C. Cooling system sensor
D crankshaft position sensor
32. on an NTC engine sensor what would happen if the sensor failed open circuit
A. Fast idle
B. Pre ignition
C. The engine would run too lean
D. The engine would run rich
