Basic Automotive Electrical Cicuits
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What are the 5 basic electrical circuits fin automotive electrical systems? - CORRECT
ANSWER - 1. Charging circuit
2. Starting
3. Ignition
4. Lighting
5. Accessory
Which circuit supplies all of the electricity for a vehicle whenever the engine is running? -
CORRECT ANSWER - The charging circuit
What are the 4 basic parts of a charging circuit? - CORRECT ANSWER - 1. Batter
2. Alternator (generator)
3. Alternator Belt
4. Voltage regulator
What is the usual type of battery used in automotive equipment? - CORRECT ANSWER -
A lead-acid cell-type battery
How many batter elements are there in most automotive batteries? - CORRECT
ANSWER -6
What are the active materials which compose the charged negative and positive plates in each
battery cell compartment? - CORRECT ANSWER - Charged negative plates contain gray
colored porous or spongy lead (Pb); Charged positive plates contain chocolate-brown colored
lead peroxide PbO2
, What color of paint is used to mark a positive battery terminal? - CORRECT ANSWER -
Red
What is the composition of the electrolyte solution used in a fully charged battery? - CORRECT
ANSWER - 60% water and 40% sulfuric acid
What is the normal specific gravity of the electrolyte used in a fully charged lead-acid storage
batter? - CORRECT ANSWER - 1.28 (at 80F)
What is the unit of measurement for the capacity of a battery? - CORRECT ANSWER -
Ampere-hour
What is the cold-cranking rating of a car battery? - CORRECT ANSWER - It shows how
much current (in amperes) the battery can deliver for 30 seconds at 0 degrees F while a terminal
voltage for 7.2 volts is maintained
What are the 2 principal methods used for charging a battery? - CORRECT ANSWER -
The constant current method and the constant voltage method
What is the usual charging rate using the constant current charging method? - CORRECT
ANSWER - 1 ampere per positive cell
When mixing electrolyte, should the water be poured into the acid, or acid into water? -
CORRECT ANSWER - The acid is ALWAYS poured into the water slowly and gently:
Pouring water into sulfuric acid can cause an explosion or splattering
What type of water should be used to fill battery cells when the electrolyte level is low? -
CORRECT ANSWER - Distilled water only
What should battery terminals be coated with when reinstalling battery cables? - CORRECT
ANSWER - Petroleum or white grease, in order to keep acid fumes off of the connections
and thus prevent corrosion
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What are the 5 basic electrical circuits fin automotive electrical systems? - CORRECT
ANSWER - 1. Charging circuit
2. Starting
3. Ignition
4. Lighting
5. Accessory
Which circuit supplies all of the electricity for a vehicle whenever the engine is running? -
CORRECT ANSWER - The charging circuit
What are the 4 basic parts of a charging circuit? - CORRECT ANSWER - 1. Batter
2. Alternator (generator)
3. Alternator Belt
4. Voltage regulator
What is the usual type of battery used in automotive equipment? - CORRECT ANSWER -
A lead-acid cell-type battery
How many batter elements are there in most automotive batteries? - CORRECT
ANSWER -6
What are the active materials which compose the charged negative and positive plates in each
battery cell compartment? - CORRECT ANSWER - Charged negative plates contain gray
colored porous or spongy lead (Pb); Charged positive plates contain chocolate-brown colored
lead peroxide PbO2
, What color of paint is used to mark a positive battery terminal? - CORRECT ANSWER -
Red
What is the composition of the electrolyte solution used in a fully charged battery? - CORRECT
ANSWER - 60% water and 40% sulfuric acid
What is the normal specific gravity of the electrolyte used in a fully charged lead-acid storage
batter? - CORRECT ANSWER - 1.28 (at 80F)
What is the unit of measurement for the capacity of a battery? - CORRECT ANSWER -
Ampere-hour
What is the cold-cranking rating of a car battery? - CORRECT ANSWER - It shows how
much current (in amperes) the battery can deliver for 30 seconds at 0 degrees F while a terminal
voltage for 7.2 volts is maintained
What are the 2 principal methods used for charging a battery? - CORRECT ANSWER -
The constant current method and the constant voltage method
What is the usual charging rate using the constant current charging method? - CORRECT
ANSWER - 1 ampere per positive cell
When mixing electrolyte, should the water be poured into the acid, or acid into water? -
CORRECT ANSWER - The acid is ALWAYS poured into the water slowly and gently:
Pouring water into sulfuric acid can cause an explosion or splattering
What type of water should be used to fill battery cells when the electrolyte level is low? -
CORRECT ANSWER - Distilled water only
What should battery terminals be coated with when reinstalling battery cables? - CORRECT
ANSWER - Petroleum or white grease, in order to keep acid fumes off of the connections
and thus prevent corrosion
