EGSA Battery and Starting Systems

Question 1

What does the Cold Cranking Ampere (CCA) rating of a battery indicate?

Accepted Answer

The current the battery can deliver for 30 seconds at 0°F while maintaining at least 7.2V

Answer

The battery's capacity in amp-hours at 77°F

Answer

The maximum charging current the battery can accept

Answer

The battery's reserve capacity at 25 amps discharge

Question 2

What is the correct specific gravity reading for a fully charged lead-acid battery cell at 77°F (25°C)?

Accepted Answer

1.265 to 1.285

Answer

1.100 to 1.150

Answer

1.175 to 1.200

Answer

1.300 to 1.350

Question 3

What is the primary purpose of a battery equalizing charge?

Accepted Answer

To balance cell voltages and reverse sulfation in flooded lead-acid batteries

Answer

To quickly charge a deeply discharged battery

Answer

To reduce battery temperature during high-load operation

Answer

To test battery capacity under full load conditions

Question 4

When two 12V, 100 Ah batteries are connected in series, what is the resulting voltage and capacity?

Accepted Answer

24V, 100 Ah

Answer

12V, 200 Ah

Answer

24V, 200 Ah

Answer

12V, 100 Ah

Question 5

Which type of starting motor is most commonly used on diesel generator sets due to its high torque at low speeds?

Accepted Answer

Series-wound DC motor

Answer

Permanent magnet motor

Answer

Shunt-wound DC motor

Answer

Compound-wound AC motor

Question 6

What is the recommended float voltage for a 12V sealed valve-regulated lead-acid (VRLA) battery?

Accepted Answer

13.5 to 13.8V

Answer

11.8 to 12.0V

Answer

12.6 to 12.8V

Answer

14.4 to 14.7V

Question 7

What is the function of a battery disconnect switch on a standby generator set?

Accepted Answer

To isolate the battery from the DC system for maintenance or to prevent parasitic drain

Answer

To regulate the charging voltage from the alternator

Answer

To control the rate of discharge during engine cranking

Answer

To synchronize battery voltage with the AC output of the generator