Vehicle Systems Quiz

In a multiplexed vehicle wiring system:

• a data bus carries signals to and from remote control units

• each unit uses a separate relay

• the supply voltage is very high

• more wire is required than conventional systems

Which of the following is the correct procedure to follow if a petrol fire occurs on a vehicle?

• try to extinguish the fire with an air line

• extinguish the flames with a CO2 extinguisher

• quickly try to find your workshop supervisor

• quickly drive the vehicle out of the workshop

One advantage of a vehicle fitted with EPAS over a vehicle fitted with hydraulic power steering is:

• improved fuel economy

• no torque sensing required

• reduced steering rack ratio

• less steering effort

Under heavy braking juddering is felt through the vehicle. The most likely cause of brake judder would be:

• excessive disc run-out

• wheel balance

• seized caliper piston

• badly worn brake linings

A coil spring is subjected to three forces during normal operation. These forces are:

• compressive, tensile and torsional

• shear, bending and compressive

• compressive, shear and torsional

• tensile, compressive and shear

When a vehicle is cornering and the front tyre pressures are under inflated, the vehicle will have a tendency to:

• wander to the offside

• neutral steer

• oversteer

• understeer

One property of brake fluid is that it is hygroscopic. What does this mean?

• its boiling point is lowered

• it makes it incompressible

• it lubricates the brake seals

• it easily absorbs moisture

As part of the MOT test, which of the following is checked on the ABS system?

• skid test

• modulator functionality

• warning lamp operation

• the ABS system is not part of the MOT test

In relation to the legal requirements affecting companies, what is the meaning of the abbreviation 'EPA'?

• Extreme Pressure Act

• Environmental Pressure Act

• Environmental Protection Act

• Employees Protection Act

When the steered wheels of a vehicle self-align, this is defined as the:

• measure of a tendency of a force to produce torsion and rotation when a wheel is accelerated

• force multiplied by the inclination of the road wheel relative to the vertical axis

• force which causes the wheel tyre assembly to return to the straight ahead position after a turn

• force which causes the wheel tyre assembly to deviate from the straight ahead position