HV03 Electrical Test 1

What is the most common use of LED lighting in modern heavy commercial vehicles?

• Side marker light

• Front driving lights

• Headlight low beams

• Front fog lights

How is the compressor clutch engaged on the air conditioning compressor?

• Using permanent magnets

• Mechanically using gears

• Using a solenoid

• Electromagnetically

What type of starter is shown in the picture?

• Inertia

• One way

• Dual voltage

• Pre-engaged

What is the signal from the alternator terminal ‘W’ normally used for?

• It provides a tachometer signal

• It supplies a dashboard voltmeter

• It provides a secondary speedometer signal

• It signals the dashboard to extinguish the charging light

Many modern heavy vehicle engines use gear reduction starter motors because:

• They are lighter, rotate faster, have lower cranking torque and higher current draw

• They are cheaper, rotate slower, have lower cranking torque and higher current draw

• They are lighter, rotate faster, have higher cranking torque and lower current draw

• They are cheaper, rotate slower, have higher cranking torque and lower current draw

When testing an electrical circuit for volt drop and current flow:

• The voltmeter and the ammeter should both be connected in series with the circuit

• The ammeter should be connected in parallel and the voltmeter in series with the circuit

• The voltmeter should be connected in parallel and the ammeter in series with the circuit

• The voltmeter and the ammeter should be connected in parallel with the circuit

When replacing quartz halogen bulbs in vehicle headlamps:

• You must not touch the reflective surface of the headlamp

• You must not touch the glass portion of the lens

• Nearside and offside bulbs should be changed at the same time

• You must not touch the glass portion of the bulb

The diagram shows three resistors. If the resistor R1 is 1 ohm, R2 is 0.5 ohm and R3 is 15 ohm, what is the reading on the ammeter (A) when the switch is closed?

• 4 volt

• 0.25 amps

• 36 amps

• 4 amps

What do the letters CAN stand for in relation to vehicle electrics/electronics?

• Controller Area Network

• Central area Network

• Control All Networks

• Cabin Area Network

The relative density of the electrolyte in a fully charged lead acid battery is approximately:

• 1380

• 1440

• 1280

• 1540