Vehicle Electrics

Module 1

A sound knowledge of electrical principles and circuit testing techniques is essential for carrying out successful fault finding of modern vehicle electrical systems. If you are unsure as to whether Vehicle electrics module 1 is a course for you, try answering the following basic questions:

1) On a wiring diagram, what symbol is usually

     used to identify a component with an

     integrated control circuit?

    A) A capacitor.

    B) A variable resistor.

    C) A diode.

    D) A transistor.

2) What is the typical current rating across the

    normally closed (NC) contacts of a 5 pin twin

    pole switching ISO micro relay?

   A) 40 Amps.

   B) 70 Amps

   C) 15 Amps.

   D) 20 Amps.

3) Which of the following open circuit voltage test

    readings taken across the battery terminals 

    indicates an approximate battery state of

    charge of 50%?

    A) 12.2 Volts

    B) 12.4 Volts

    C) 10.5 Volts

    D) 12.7 Volts

4) On a wiring diagram, which electrical circuit

    group is represented by DIN number 53?

    A) Headlamps and side lamps circuit.
    B) Windscreen wipers.
    C) Brake lamps and high level brake lamp.
    D) Indicators and hazard warning lamps.

5) Which of the following statements is not true

    regarding testing a battery using a digital

    battery analyser?

    A) The digital battery analyser tests the battery’s 

         state of charge and also its ability to deliver a 

         heavy current.

    B) The digital battery analyser tests the electrical

         conductance of the battery cell plate material.

    C) The battery state of charge must be at least

         75% before carrying out a test using a digital

         battery analyser.

    D) The digital battery analyser gives an almost 

         instantaneous test result and does not

         overload the battery.

6) In an electrical circuit, what is the normal

    maximum acceptable voltage that should be

    present on the earth wire if the circuit is in good

    condition and functioning normally?

    A) Maximum 300mV.

    B) Maximum 0.030V.

    C) Maximum 0.5 Volts.

    D) Maximum 1 Volt.

7) How is the regulator energized on an alternator

    with digital field monitoring?

    A) It receives a voltage supply at terminal 61 via 

         the charge warning indicator lamp when the

         ignition is switched on.

    B) It receives a voltage supply at terminal 30 via 

         the charge warning indicator lamp when the  

         ignition is switched on. 

    C) It receives a voltage supply from the engine

         ECM when the ignition is switched on.

    D) It is energized via a pulsed earth from the

         engine ECM when the ignition is switched on.

8) Which of the following ‘DIN’ numbers is correct for      the relay terminal indicated by the arrow in the      diagram below A) 30               B) 87a               C) 87b               D) 86 9) What is the advantage of using the manual ranging     mode of a digital multi meter to select measurement     scales?     A) It allows the meter to automatically select the best          measurement scale.     B) The user can select the most appropriate          measurement scale.     C) In manual ranging mode, the multi meter becomes          more sensitive.     D) Manual ranging mode changes the default setting          of the multi meter. 10) Which of the following statements best describes        the benefits of using a ‘smart’ battery charger?     A) A smart battery charger will restore a heavily          sulphated battery to its full state of charge in about          30 - 60 minutes.     B) A smart battery charger will recharge a discharged          battery regardless of the battery’s condition at the          time of charging.     C) A smart battery charger can recover a sulphated           battery without damaging the battery by pulsing the            charge input to the battery.     D) A smart battery charger can monitor the battery state          of charge during the charging process and adjust              the charge rate accordingly.

Contact

Did you know the answers? Would you like to know more? To book a place on the next available course and find out, contact: Tony Kitchen MIMI (AK Training) Telephone: 01908 579309 Mobile: 07968 842274 Click here to send e-mail Mobile e-mail: tony.ak@blackberry.orange.co.uk Course dates and venues Click here to go back to Vehicle electrical fault finding techniques page

Motor Industry Professional

Technical Services