ASE Electrical and Electronic Systems 2

Question 1

During cranking, a voltage drop test across the positive battery cable (battery post to starter terminal) should generally read no more than:

Accepted Answer

0.5 volt

Answer

Most manufacturers allow about 0.5 V maximum drop on the starter's positive cable circuit under load.

Question 2

After all modules go to sleep, what is a typical maximum acceptable key-off parasitic draw on most late-model vehicles?

Accepted Answer

About 50 mA or less

Answer

Most vehicles specify roughly 50 mA or less once modules have entered sleep mode.

Question 3

A 12-volt circuit has a total resistance of 4 ohms. How much current flows?

Accepted Answer

3 amps

Answer

Using Ohm's law, I = E / R, so 12 V / 4 Ω = 3 A.

Question 4

A voltmeter connected across an open switch in a 12-volt series lamp circuit will read:

Accepted Answer

Battery voltage (about 12 volts)

Answer

With no current flow, there is no drop across the lamp, so the full source voltage appears across the open.

Question 5

When a good silicon diode is tested with a DMM on the diode-check function, the expected readings are:

Accepted Answer

About 0.5–0.7 V one direction and OL in the other

Answer

A good diode conducts in one direction (about 0.5–0.7 V drop) and blocks in the other (OL).

ASE - Automotive Service Excellence Certified Tech Practice Test