310S Electrical and Electronic Systems 4

Question 1

A technician notices the battery warning light flickers at idle but goes off at higher RPM. What should be checked first?

Accepted Answer

The drive belt tension and alternator output at idle

Answer

The battery state of charge

Answer

The dashboard bulb socket for a loose connection

Answer

The fuse for the charging circuit

Question 2

What is the purpose of the diode trio in an alternator?

Accepted Answer

To supply DC current to the rotor field coil from the stator output

Answer

To convert AC to DC for the vehicle's electrical system

Answer

To protect the battery from overcharging

Answer

To regulate alternator speed

Question 3

What is the correct procedure for testing a fuse without removing it from the fuse box?

Accepted Answer

Use a test light or voltmeter to check for power on both sides of the fuse with the circuit energized

Answer

Visually inspect the element through the transparent housing

Answer

Shake the fuse and listen for rattling

Answer

Measure resistance across the fuse with the circuit off

Question 4

What causes alternator whine in the audio system?

Accepted Answer

AC ripple from a failing rectifier diode coupling into the audio signal wiring

Answer

A faulty radio antenna

Answer

Speakers that are too large for the amplifier

Answer

A worn drive belt squealing at high frequency

Question 5

A vehicle equipped with daytime running lights (DRLs) has one DRL that does not illuminate. The headlights work normally. What is the most likely cause?

Accepted Answer

A burned-out DRL bulb or LED unit

Answer

A blown headlight fuse

Answer

A faulty DRL module or relay controlling that specific circuit

Answer

A discharged battery

Question 6

What does a waveform with missing humps on an alternator AC ripple test indicate?

Accepted Answer

One or more failed rectifier diodes

Answer

A worn drive belt

Answer

A shorted rotor field coil

Answer

Normal three-phase output