ASE Mechanical & Electrical Components 2

Question 1

A vehicle's battery reads 12.2 volts at rest. What is its approximate state of charge?

Accepted Answer

50%

Answer

A resting voltage of 12.2V corresponds to roughly a 50% state of charge.

Question 2

Which tool is best for measuring excessive resistance (voltage drop) in a starter cable?

Accepted Answer

Voltmeter set across the cable while cranking

Answer

A voltage-drop test uses a voltmeter across a circuit under load to reveal hidden resistance.

Question 3

A whining noise from the alternator that rises with engine speed most likely indicates:

Accepted Answer

Worn bearings

Answer

Worn alternator bearings produce a whine or growl that tracks engine RPM.

Question 4

What does a parasitic draw test measure?

Accepted Answer

Current drawn with the ignition off

Answer

A parasitic draw test checks for current leaking from the battery while everything is off.

Question 5

Which component converts the alternator's AC output into DC for the vehicle?

Accepted Answer

Rectifier diodes

Answer

The diode rectifier bridge converts the stator's AC into usable DC.

ASE Practice Test