Vehicle Electrics

Module 2

Test your knowledge

Try answering the following questions:

1) What is the main advantage of an oscilloscope 

    compared to a digital multi meter?

    A) It has a higher sample rate and can display

         high frequency electrical signals.

    B) It has a lower sample rate and can accurately

         display high frequency electrical signals.

    C) It has a lower sample rate that can detect low

         wattage signals.

    D) It has a higher sample rate that can

         automatically detect the voltage scale of the

         signal.

2) What is the function of the integrated control

    module connected to a window regulator motor

    as indicated by the red arrow in the picture

    below?

Window regulator motor with integrated

                  control module

    A) It recognises the end travel positions of the

         motor.

    B) It enables the motor to operate at different

         speeds.

    C) It provides additional window regulator system

         functionality.

    D) It eliminates the need for a window regulator

         switch.

3) What voltage would you expect to see at the

    earth terminal of a negatively switched 12 volt

    actuator with the ignition switched on and the

    actuator de energized?

    A) 12 volts continuous voltage.

    B) 0 volts continuous voltage.

    C) 0-12 volts pulsing voltage.

    D) Maximum 300mV.

4) What is the significance of the voltage supplied

    to an inductive pulse generator when the 

    ignition is switched on?

    A) To enable circuit monitoring of the sensor and

         associated wiring.

    B) The voltage energizes the winding of the

         inductive pulse generator.

    C) The voltage is not significant.

    D) To enable the sensor to generate a signal

         voltage at low RPM.

5) What fault would be indicated by a voltage

    reading of 4.98 volts measured on the sensor

    ground wire of an engine coolant temperature

    sensor with the engine at operating

    temperature? 

    A) This is the approximate expected voltage

         signal from the sensor with the engine at

         operating temperature.

    B) The voltage indicates that the sensor itself has

         failed open circuit.

    C) The voltage indicates that the sensor has failed

         in a low resistive state.

    D) The voltage indicates an open circuit on the

         sensor ground circuit.

6) If an actuator is energized for 5 ms and then     de energized for 15 ms, what is its % duty cycle?     A) 50%.     B) 25%.     C) 20%.     D) 15%. 7) Which of the following statements describes     the operation of a Hall effect sensor?     A) It is an inductive type switch that produces a          sinusoidal wave form.     B) It is an electro magnetic switch that produces a          positively triggered square wave signal.     C) It is a semi conductive switch that produces a          signal by switching a voltage to ground.     D) It induces current flow in a winding to produce          a sinusoidal wave form. 8) The illustration below shows a voltage divider circuit      used for the steering wheel multi function controls      of a vehicle's audio system. Which switch, when      pressed, will create the lowest resistance through       the circuit from terminal X to terminal Y?     Steering wheel multi function controls     A) SRC (switch 3).     B) NXT (switch 6)     C) SEEK << (switch 5).     D) VOL - (switch 1).

Further information

Did you know the answers? Would you like to know more? To book a place on the next available course and find out, contact: AK Training Telephone: 00 44 (0) 1908 579309 Mobile: 07968 842274 Click here to send e-mail Course dates and venues 2008 Go to Electrics Module 2 course page

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