ASE A6 Electrical Electronic Systems
Practice Exam 100 Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
Download Pdf
1. When performing a voltage drop test on a ground circuit, the multimeter
leads should be connected:
A. Between the battery positive terminal and the component ground
B. Between the component ground connection and a clean chassis ground
point
C. In series with the ground wire
D. Across the battery terminals
B. Between the component ground connection and a clean chassis ground
point
For a ground-side voltage drop test, connect the multimeter between the
component ground connection and a known good chassis ground. This
measures the voltage lost across the ground path. A reading above 0.1V
indicates excessive resistance.
2. A vehicle has a parasitic battery drain of 250 mA. The most likely cause is:
A. A shorted alternator diode
B. Normal memory draw from modules
C. A stuck relay or module not going to sleep
,D. A loose battery cable
C. A stuck relay or module not going to sleep
Normal parasitic draw is typically 20-50 mA. A reading of 250 mA indicates a
component is not "going to sleep" after the vehicle is turned off. Common
causes include stuck relays, faulty modules, or aftermarket accessories
staying on.
3. What is the maximum acceptable voltage drop across a single ground
connection in a 12V automotive circuit?
A. 0.01V
B. 0.1V
C. 0.5V
D. 1.0V
B. 0.1V
The industry standard maximum acceptable voltage drop for ground
connections is 0.1V (100mV). This ensures minimal resistance and proper
current flow. Higher readings indicate corroded or loose connections.
4. When using a digital multimeter to test continuity, the circuit should be:
A. Powered with battery voltage
B. Disconnected from power sources
C. Operating normally
D. Connected to a scan tool
B. Disconnected from power sources
Continuity testing must be performed on circuits disconnected from power
sources to prevent damage to the multimeter and to get accurate readings.
The meter sends a small test current through the circuit to check for complete
paths.
,5. An oscilloscope is the preferred diagnostic tool for:
A. Measuring battery voltage
B. Checking alternator output
C. Viewing rapidly changing signals and waveforms
D. Testing fuse continuity
C. Viewing rapidly changing signals and waveforms
An oscilloscope displays voltage over time, making it ideal for viewing rapidly
changing signals like crankshaft position sensor outputs, CAN bus
communication, and ignition patterns that a DVM cannot capture.
6. A technician replaces a blown fuse in the dome light circuit, and the
element in the fuse melts immediately. Technician A says if a dome light
keeps blowing fuses to check for a short to ground. Technician B says
excessive resistance in this circuit has increased current flow. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A or B
A. Technician A
When a circuit repeatedly blows a fuse, check for a short. Resistance
decreases current flow. Fuses protect automotive circuits from excessive
current.
7. All of the following are true about 12-volt maintenance-free battery
replacement EXCEPT:
A. Use a computer memory saver
, B. Remove the negative terminal first
C. Replace the positive terminal last
D. Use a battery terminal puller if the terminal is stuck to the post
C. Replace the positive terminal last
The negative terminal is the first off and the last on. Using a memory saver is
a great way to retain the memory in computer modules. If the terminal is
stuck to the post, don't pry at it and possibly damage the case. Use a battery
terminal puller instead.
8. All of the following are true statements about a fully charged lead acid
battery EXCEPT:
A. It acts as a capacitor smoothing current
B. It powers the accessories while the engine is running
C. The electrolyte has a specific gravity of 1.265
D. It powers the starter while the engine is cranking
B. It powers the accessories while the engine is running
This is an EXCEPT type question. Once the engine starts, the charging system
takes over and provides power for all accessories. Due to the nature of their
design, batteries act as capacitors, smoothing A/C current and alternator
ripple. The electrolyte of a good battery has a specific gravity of ~1.265. It
provides a high current above 100 amps to operate the starter motor.
9. With the engine running the voltage between pin 6 and ground measures
3.00 Vdc and the voltage between pin 14 and ground measures 2.00 Vdc.
Technician A says this is normal. Technician B says these readings indicate
crossed wires or shorted connector pins. Who is correct?
A. Technician A
B. Technician B
Practice Exam 100 Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
Download Pdf
1. When performing a voltage drop test on a ground circuit, the multimeter
leads should be connected:
A. Between the battery positive terminal and the component ground
B. Between the component ground connection and a clean chassis ground
point
C. In series with the ground wire
D. Across the battery terminals
B. Between the component ground connection and a clean chassis ground
point
For a ground-side voltage drop test, connect the multimeter between the
component ground connection and a known good chassis ground. This
measures the voltage lost across the ground path. A reading above 0.1V
indicates excessive resistance.
2. A vehicle has a parasitic battery drain of 250 mA. The most likely cause is:
A. A shorted alternator diode
B. Normal memory draw from modules
C. A stuck relay or module not going to sleep
,D. A loose battery cable
C. A stuck relay or module not going to sleep
Normal parasitic draw is typically 20-50 mA. A reading of 250 mA indicates a
component is not "going to sleep" after the vehicle is turned off. Common
causes include stuck relays, faulty modules, or aftermarket accessories
staying on.
3. What is the maximum acceptable voltage drop across a single ground
connection in a 12V automotive circuit?
A. 0.01V
B. 0.1V
C. 0.5V
D. 1.0V
B. 0.1V
The industry standard maximum acceptable voltage drop for ground
connections is 0.1V (100mV). This ensures minimal resistance and proper
current flow. Higher readings indicate corroded or loose connections.
4. When using a digital multimeter to test continuity, the circuit should be:
A. Powered with battery voltage
B. Disconnected from power sources
C. Operating normally
D. Connected to a scan tool
B. Disconnected from power sources
Continuity testing must be performed on circuits disconnected from power
sources to prevent damage to the multimeter and to get accurate readings.
The meter sends a small test current through the circuit to check for complete
paths.
,5. An oscilloscope is the preferred diagnostic tool for:
A. Measuring battery voltage
B. Checking alternator output
C. Viewing rapidly changing signals and waveforms
D. Testing fuse continuity
C. Viewing rapidly changing signals and waveforms
An oscilloscope displays voltage over time, making it ideal for viewing rapidly
changing signals like crankshaft position sensor outputs, CAN bus
communication, and ignition patterns that a DVM cannot capture.
6. A technician replaces a blown fuse in the dome light circuit, and the
element in the fuse melts immediately. Technician A says if a dome light
keeps blowing fuses to check for a short to ground. Technician B says
excessive resistance in this circuit has increased current flow. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A or B
A. Technician A
When a circuit repeatedly blows a fuse, check for a short. Resistance
decreases current flow. Fuses protect automotive circuits from excessive
current.
7. All of the following are true about 12-volt maintenance-free battery
replacement EXCEPT:
A. Use a computer memory saver
, B. Remove the negative terminal first
C. Replace the positive terminal last
D. Use a battery terminal puller if the terminal is stuck to the post
C. Replace the positive terminal last
The negative terminal is the first off and the last on. Using a memory saver is
a great way to retain the memory in computer modules. If the terminal is
stuck to the post, don't pry at it and possibly damage the case. Use a battery
terminal puller instead.
8. All of the following are true statements about a fully charged lead acid
battery EXCEPT:
A. It acts as a capacitor smoothing current
B. It powers the accessories while the engine is running
C. The electrolyte has a specific gravity of 1.265
D. It powers the starter while the engine is cranking
B. It powers the accessories while the engine is running
This is an EXCEPT type question. Once the engine starts, the charging system
takes over and provides power for all accessories. Due to the nature of their
design, batteries act as capacitors, smoothing A/C current and alternator
ripple. The electrolyte of a good battery has a specific gravity of ~1.265. It
provides a high current above 100 amps to operate the starter motor.
9. With the engine running the voltage between pin 6 and ground measures
3.00 Vdc and the voltage between pin 14 and ground measures 2.00 Vdc.
Technician A says this is normal. Technician B says these readings indicate
crossed wires or shorted connector pins. Who is correct?
A. Technician A
B. Technician B
