ASE A6 - Electrical / Electronics Practice Test

6. Two technicians are discussing a battery's state of charge. Technician A says a specific gravity of 1.225 at 80F indicates that a battery's state of charge is approximately 75%. Technician B says you can use a hydrometer to check battery state of charge on a maintenance free battery. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

a. A only Technician A is correct and Technician B is wrong because maintenance free batteries do not have openings to check the specific gravity of the electrolyte with a hydrometer.

15. Technician A says an aiming screen will work on any headlight design to aim the headlights. Technician B says mechanical aimers are used on HID (High Intensity Discharge) headlights. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

a. A only Technician A is correct because the aiming screen is the tool of choice due to the many different headlight designs used. Technician B is wrong because mechanical aimers are no longer used and were never used on HID headlights.

1. When using a DMM (Digital Multimeter) voltmeter function to check for a voltage drop, meter leads should be connected in which of the following ways? a. On the "positive" side of the circuit b. Across the component or circuit c. To any non-conductive material d. In series with the circuit

b. Across the component or circuit Voltage is always checked in parallel or across the device or circuit.

11. Technician A says a loose serpentine alternator drive belt could cause overcharging. Technician B says undersized wiring between the alternator and the battery could cause undercharging. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

b. B only Technician A is wrong because a slipping belt will cause undercharging. Technician B is correct because undersize wiring will cause undercharging due to higher resistance.

8. Two technicians are discussing testing a battery using an electronic conductance or continuity tester. Technician A says some of these testers can load test a battery. Technician B says you need to make sure that the ignition switch and all accessories are off. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

b. B only Technician A is wrong because this device cannot apply a load. It checks battery conductance.

16. Which of the following describes the MOST common type of electrical wiring used in instrument lighting? a. Aluminum stranded type b. Copper stranded type c. Twisted pair type d. Solid copper type

b. Copper stranded type Copper stranded type electrical wiring is the correct answer because the other types are not common.

3. When a Digital Multimeter (DMM) is used to measure DC voltage and is connected in parallel to the load device, which of the following defines the reading? a. Amperage reading b. Voltage drop c. Voltage spike d. Pulse width modulation

b. Voltage drop Based on Kirchhoff's Voltage Law: Sum of voltage drops in any circuit will equal source VOLTAGE or VOLTAGE applied to circuit.

14. Technician A says you aim HID (High Intensity Discharge) headlights on a level floor with an unloaded vehicle. Technician B says when aiming any headlights, you must follow the state inspection specifications. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

c. Both A and B Both statements are correct

12. Technician A says high-intensity discharge (HID) headlights are generally brighter and have a blue tint. Technician B says a defective turn signal bulb on one side can cause the turn signal on that side not to blink. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

c. Both A and B Both statements are correct.

9. Two technicians are discussing an alternator with zero output. Technician A says the field circuit may have an open circuit. Technician B says the fusible link may be open from the battery to the alternator. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B

c. Both A and B Both statements are correct.

4. Which of the following tools can be used to check the continuity of wires that carry digital signals? a. Megger Meter b. Analog meter c. Logic probe d. Voltmeter

c. Logic probe A logic probe is the only device that measures digital signals.

13. Which of the following is the LEAST likely cause of a dim headlight? a. Headlight connector corroded b. Damaged or broken headlight assembly c. Low alternator output d. High resistance in the headlight wiring

c. Low alternator output Low alternator output is the least likely cause. All of the other choices will cause a dim headlight.

10. This question is not like the ones above. It has the word LEAST. For this question, look for the choice that would LEAST LIKELY cause the described situation. Read the entire question carefully before choosing your answer. An alternator has low output and is being full-fielded to determine the cause. Which of the following is the LEAST likely result of full-fielding the alternator? a. High battery voltage level b. Battery gassing c. Low battery voltage level d. High alternator amperage output

c. Low battery voltage level Full fielding removes the regulator from controlling field current allowing the alternator to go to full output and is unlikely to produce a low battery voltage. This action normally produces high current and voltage. P (Power) = I (Current) x E (Voltage) and is least likely to occur.

7. When performing a load test on a battery, a technician finds that the battery voltage drops below specifications. Which of the following is the MOST likely action to perform? a. Recharge the battery and return it to service b. Recharge the battery and retest it c. Replace the battery d. Replace the voltage regulator

c. Replace the battery The battery was tested under load and failed.

17. What type of solder is required to repair the instrument panel wiring? a. Acid core b. 60/40 with no flux c. Rosin core d. 50/50 with acid paste flux

c. Rosin core Rosin core is the specified type of solder to use on any electrical repair to insure integrity.

19. If a fuel gauge reads full, which of the following is the MOST likely cause? a. A broken gauge b. Float stuck in the up position c. Wire to sending unit grounded d. An open fuse

c. Wire to sending unit grounded A wire to the sending unit being grounded is the most likely cause on most systems.

5. Using a DMM (Digital Multimeter), a fully charged 12 volt battery should indicate how much voltage on the open circuit voltage (OCV) test? a. 9.6 volts b. 4 volts per cell c. 1 volt per cell d. 12.6 volts

d. 12.6 volts The standard is 2.1 volts per cell and 2.1 times 6 is 12.6 volts.

18. A dash indicator warning lamp does not light when the key is in the ON or START positions. What should you check first? a. Sending unit b. Wiring c. Battery level d. Bulb

d. Bulb Checking the bulb is the quickest and easiest thing to do.

2. Which of the following is correct regarding a series circuit? a. Highest resistance has most current b. Lowest resistance has most current c. Lowest resistance has highest voltage drop d. Highest resistance has highest voltage drop

d. Highest resistance has highest voltage drop Based on Kirchhoff's Voltage Law: Voltage higher before resistance than after, which is the result of total applied voltage not equal at both ends of a single load circuit. Resistance in circuit opposes electron flow with resulting voltage loss applied to load. The Loss is voltage drop with the voltage lost/consumed as current moves through resistance. HIGHER Resistance, HIGHER DROP.