Automotive Electrical Electronics AUTO 170 Practice Exam 2026 Complete 60 Questions

AUTOMOTIVE

ELECTRICAL

ELECTRONICS AUTO 170

PRACTICE EXAM 2026

COMPLETE 60 QUESTIONS

Question 1: A technician measures 12.4 V on the battery side of a loaded connector and 10.9 V on the load side. What does the 1.5 V di�erence most strongly indicate?

Choices:

1) An open circuit upstream of the connector 2) Excessive resistance at or near the connector 3) A short to ground after the load 4) Normal operation of a 12 V circuit

Correct Answer: Excessive resistance at or near the connector

Explanation: With current �owing, a 1.5 V drop across a connector is excessive and indicates unwanted resistance at the connector or its connections.Page 1

Question 2: A 12 V source is connected across a 4 ohm load. Ignoring wiring

resistance, how much current should �ow?

Choices:

1) 2 A

2) 3 A

3) 4 A

4) 48 A

Correct Answer: 3 A

Explanation: Ohm's law gives I = V/R = = 3 A.

Question 3: Two resistors of 6 ohms and 3 ohms are connected in parallel. What is the total circuit resistance?

Choices:

1) 2 ohms 2) 3 ohms 3) 4.5 ohms 4) 9 ohms

Correct Answer: 2 ohms

Explanation: For two parallel resistors, Rt = (R1 x R2)/(R1 + R2) = (6 x 3)/(6 + 3) = = 2 ohms.Page 2

Question 4: Before using the ohmmeter function of a DMM to check the resistance

of a component, what should the technician generally do?

Choices:

1) Keep the circuit powered so current can �ow 2) Disconnect power and isolate the component as required 3) Connect the meter in series with the battery 4) Set the meter to the highest DC amp range

Correct Answer: Disconnect power and isolate the component as required

Explanation: Resistance testing is normally performed with the circuit de-energized. Isolating the component prevents circuit voltage and parallel paths from producing unsafe or misleading readings.

Question 5: A parasitic draw test shows 0.080 A after all modules have entered

sleep mode. How much current is this in milliamps?

Choices:

1) 8 mA 2) 80 mA 3) 800 mA 4) 8000 mA

Correct Answer: 80 mA

Explanation: 0.080 A x 1000 = 80 mA.

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