A full turn of a micrometer thimble will move the jaws apart by:
1 mm
0.01mm
0.50 mm
2.00 mm
Disc run-out is best measured with:
Feeler gauges
A mercer gauge
A micrometer
A dial test indicator
Camber angle is:-
The forward (positive) inclination of the swivel axis looking from the side.
The inclination of a wheel so the top is nearer the centre line of the car than the bottom.
The angle the car sits in relation to the road surface.
The drag of a cars steering wheel to the left because of road camber.
Caster angle is:-
The angle between the two steering arms (ie Ackerman angle)
The inclination (forward or backward) of the swivel axis looking from the side.
The tilt of the road wheels from the vertical
The angle of inclination of the king pin towards the bottom ball joint and diff.
The Ackerman principle is designed to:-
Give true rolling steering geometry when the car is cornering.
Give true rolling steering geometry when the car is driving straight.
Work on double wishbone geometry
Ensure the diff stays in the centre of the geometry configuration tangent.
A tyre wears in the centre only. A possible reason for this is:
The tracking is out on that side
The tyre is over inflated
The load rating is too high
It is the wrong diameter
Ohm’s Law says that
Power = Amps x Volts
Volts = Amps x Power
Volts = Watts x Amps
Amps = Volts x Resistance
A thermistor is a:
A resistor whose resistance changes with temperature
A type of thermometer
A de-mister for a thermostat
A heated rear window or mirror circuit
If a 4-stroke engine with a firing order of 1-3-4-2 is has No. 1 on compression stroke, what stroke will No. 4 cylinder be on now?
The Induction stroke
Compression
Power
Exhaust
If a vehicle has a gearbox ratio of 0.9 : 1 and a final drive ratio of 4 : 1, what is the overall ratio?
4.9 : 1
3.6 : 1
3.1 : 1
49 : 1
What type of sensor is often used for crankshaft position?
Hot wire
Inductive
Thermistor
Lambda
Which type of sensor will give a digital or square wave signal on an oscilloscope?
Inductive
Hall type
Thermistor
MAP
In a hydraulic system, if the slave piston has a greater diameter than the master cylinder, then:-
The force from slave will be amplified
The force from the slave cylinder will be diminished
The force will be the same, but the movement in the slave cylinder will be less
It makes no difference, as the pressure acts equally in all directions. (Pascals’ law)
Which of these could cause excessive valve clearances?
Worn lobe of the cam
High compression ratio
Thin (low viscosity) engine oil
Worn adjustment shim
A camshaft rotational speed is
Half crankshaft speed
Twice crankshaft speed
Same as crankshaft
Variable with the timing
A possible cause of blue smoke from an engine could be
Worn valve stem seals
Leaking rocker cover gasket
Broken or worn rear crank seal
Piston to bore clearance within tolerance
If you put a multi-meter set to 20V DC across the terminals of a switch with a poor internal connection, with the circuit on, what reading would you expect? (12v system)
12 v
0 v
Somewhere between 2 & 8 volts
0.2 Ω
A cylinder leakage test will help you to determine
The efficiency (fuel economy) of an engine
The compression ratio of the engine
The mechanical condition of engine
The volumetric efficiency of the engine
With what would measure the piston ring gap of an engine
A micrometer
A mercer gauge
A compression test
Feeler gauges
The viscosity of oil relates to:-
Its resistance to flow
The lubricating quality under pressure and temperature
Its suitability for either petrol or diesel engines
The level of detergents and other additives like anti-oxydents
A diesel exhaust smoke test, tests for what?
Opacity
Burning oil
C02
N0x
What might be the cause of excess black smoke from a turbo diesel exhaust?
Worn piston rings or bore?
Faulty turbo
EGR valve operating efficiently
All of the above
A modern common rail diesel can have fuel pressures up to
300psi
3000 bar
30 bar
300 bar
An MOT test will check a modern petrol vehicle for what emissions?
CO, CO2, H, H2O
CO, CO2 NOx, H2O
CO2, NOx, O2, HO2
CO, O2, HC, CO2
What is 100 bar in psi? (pounds per square inch)
14.5
145
1450
14500
On a CAN bus system, what is controlled by High Speed circuit?
Engine sensors, ECU, brake warning and lights, indicators.
ABS, SRS
Mirrors, HRW, Interior lights etc.
They all run at the same speed
How may CAN wiring be repaired?
Twist together the pair, solder and insulate preferably with shrink wrap
Cannot be repaired. Fit a new part loom
Keep the wires straight and use anti interference crimp connectors (Type EC 2007-4)
Specialist repair only using high carbon copper digital cable (co-axial) & connectors
A vehicle’s Castor data is given as 5 degrees 30’ ± 45’ . Which one of the following is not within that range?
6 degrees 10’
5 degrees 45’
4 degrees 40’
4 degrees 55’
A catalytic converter in a petrol engine exhaust contains special metals. Which of these do they contain?
Platinum, Mercury & Palladium
Gold, Silver & Rhodium
Rhodium, Palladium and Platinum
Gold, Frankincense & Myrrh
What is not a probable reason for a vehicle pulling to one side when driving?