Chassis Systems Quiz 1

How does an ABS system detect that a wheel is about to lock?

• sensing a sudden drop in AC voltage from the wheel sensor

• sensing the deceleration force

• sensing a sudden drop in DC voltage from the wheel sensor

• sensing a sudden drop in speed from the vehicle tachograph

When measuring the current consumption of an ABS electro-pneumatic solenoid, it is important that:

• the ohm meter must be connected in parallel

• the ohm meter must be connected in series

• the ammeter must be connected in parallel

• the ammeter must be connected in series

During hard braking an insecure load in the boot of a light vehicle will slide forward due to:

• gravitational force

• normal force

• inertia force

• centrifugal force

Which of the following checks would determine the serviceability of an ABS sensor in situ?

• connect a volt meter across the sensor pins, the voltage should read 5v

• an ABS sensor cannot be tested in situ

• connect an oscilloscope across the output pins and spin the wheel

• connect an ammeter across the sensor pins, reading should be 20 amps

The diagram represents a waveform from an ABS inductive wheel speed sensor. As the wheel speed increases the:

• voltage increases and the frequency stays the same

• voltage remains the same and the frequency remains the same

• voltage remains the same and the frequency increases

• voltage increases and the frequency increases

Using the above diagram, which of the following would increase the voltage?

• decrease the sensor air gap

• increasing the sensor input voltage

• decreasing the sensor input voltage

• increasing the sensor air gap

Which of the following diagnostic tools is best suited to measure the output from a light vehicle ABS sensor?

• a DC volt meter

• an ohmmeter

• a dynamometer

• an oscilloscope

The output voltage from an inductive wheel speed sensor can be measured by:

• a voltmeter set to 10 – 100 volts AC

• a voltmeter set to 0 – 10 volts AC

• a voltmeter set to 10 – 100 volts DC

• a voltmeter set to 0 – 10 volts DC

What type of trace would you expect to see on an oscilloscope when testing a hall effect sensor?

• a variable frequency

• a square wave

• a sine wave

• a cosine wave

When discussing the coefficient of friction, it can be said that:

• the coefficient of static friction is higher than the coefficient of dynamic friction

• the coefficient of friction remains constant whether the surfaces are moving or static

• the coefficient of dynamic friction is higher than the coefficient of static friction

• the coefficient of static friction is lower than the coefficient of dynamic friction