ASE Electrical/Electronic Systems 2

Question 1

A voltage drop test across a closed switch reads 1.2 volts. What does this indicate?

Accepted Answer

Excessive resistance in the switch contacts

Answer

A voltage drop greater than about 0.1V across a closed switch indicates unwanted resistance from corroded or burnt contacts.

Question 2

Which instrument is best for measuring parasitic (key-off) battery drain?

Accepted Answer

Ammeter in series with the disconnected battery cable

Answer

An ammeter placed in series in the battery circuit measures the actual current drawn while the vehicle is off.

Question 3

A relay has terminals 85, 86, 87, and 30. Which two terminals are the control (coil) side?

Accepted Answer

85 and 86

Answer

Terminals 85 and 86 energize the relay coil, while 30 and 87 carry the switched load.

Question 4

Total resistance in a parallel circuit is always:

Accepted Answer

Less than the smallest individual resistor

Answer

Adding parallel paths gives current more routes, lowering total resistance below the smallest branch.

Question 5

An alternator's diodes are responsible for:

Accepted Answer

Converting AC voltage to DC

Answer

The diode rectifier bridge converts the stator's alternating current into direct current for the vehicle.

ASE Practice Test