BASIC ALTERNATOR & BATTERY ASSESSMENT II

1. Which one of these best describes function of the alternator?

• A. Electric generator that uses mechanical (engine) power to produce electricity
• B. Ammeter, voltmeter, or warning light that warns the driver about charge condition
• C. Wiring that connects the parts of the system.
• D. Large device that stores electricity for use later on

2. The alternator is a device for changing mechanical energy into _____ energy.

• A. potential
• B. chemical
• C. thermal
• D. electrical

3. Technician A believes that once an engine starts running, the engine crankshaft pulley powers the alternator to supply electricity to a car’s electrical systems. Technician B feels a battery is a car’s sole electrical supplier. Who is right?

• A. Technician A Only
• B. Technician B Only
• C. Both Technician A and B
• D. Neither A or B

4. Technician A says alternator rear bearings are frequently held in place with a small plate and screws. Technician B says alternator front bearings are usually press-fit. Who is right?

• A. Technician A Only
• B. Technician B Only
• C. Both Technician A and B
• D. Neither A or B

5. The alternator current must be _____ into direct current before entering the vehicle’s electrical system.

• A. forward biased
• B. reverse biased
• C. rectified
• D. Inverted

6. 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

7. 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

8. 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

9. 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

10. 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