Automotive Electrical Quiz Questions And Answers

Reviewed by Matt Balanda
Matt Balanda, BS, Science |
Physics Expert
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Matt graduated with a Master's in Educational Leadership for Faith-Based Schools from California Baptist University and a Bachelor's of Science in Aerospace Engineering and Mathematics from the University of Arizona. A devoted leader, transitioned from Aerospace Engineering to inspire students. As the High School Vice-Principal and a skilled Physics teacher at Calvary Chapel Christian School, his passion is nurturing a love for learning and deepening students' connection with God, fostering a transformative educational journey.
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Are you interested in an automotive electrical quiz? Have you got a passion for cars and a distinct knowledge of the ins and outs of these automobiles and the specific conditions required to keep them running smoothly every day? Take the following quiz, and you might find yourself with the knowledge to someday become an auto electrician! What is the process being undertaken, from putting your key into the ignition to taking off on the open road? Let’s see if you can tell us!

• 1.

You have to remove a bolt with a 1/2" head, but you only have metric sockets. If we believe 1" is equal to 25.4mm, tell us the size socket which will most effectively remove the bolt?

• A.

10mm

• B.

12mm

• C.

13mm

• D.

14mm

• E.

15mm

C. 13mm
Explanation
The bolt has a 1/2" head, which is equivalent to 12.7mm. Since the closest metric socket size to 12.7mm is 13mm, the 13mm socket will most effectively remove the bolt.

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• 2.

When a 12V lead acid battery is discharged, what is the end state of the electrolyte (liquid)?

• A.

Sulfuric acid (H2SO4)

• B.

Water (H20)

• C.

Hydrochloric acid (HCl)

• D.

B. Water (H20)
Explanation
When a 12V lead acid battery is discharged, the end state of the electrolyte (liquid) is water (H20). During the discharge process, the chemical reaction within the battery converts the sulfuric acid (H2SO4) in the electrolyte into water (H20) and lead sulfate (PbSO4). This is a reversible reaction, and when the battery is charged again, the lead sulfate is converted back into sulfuric acid, replenishing the electrolyte. Therefore, at the end of the discharge process, the electrolyte consists mainly of water.

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• 3.

This spanner is known as a _________ spanner

• A.

Open-end

• B.

Double ring

• C.

Combination

• D.

Crowsfoot

C. Combination
Explanation
A combination spanner is a type of spanner that has open-end jaws on one end and a ring or socket on the other end. It is called a combination spanner because it combines the features of both an open-end spanner and a ring spanner. This allows it to be used for different types of nuts and bolts, making it a versatile tool.

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• 4.

You have to remove a bolt with a 1/5" head, but you only have metric sockets. If we believe 1" is equal to 25.4mm, tell us the size socket which will most effectively remove the bolt?

• A.

10mm

• B.

12mm

• C.

13mm

• D.

None of these

D. None of these
Explanation
None of these options will effectively remove the bolt. Since the bolt has a 1/5" head, we need a socket size that is slightly larger than 1/5" in order to fit properly. Converting 1/5" to metric, we get approximately 5.08mm. Therefore, the closest socket size that will most effectively remove the bolt is 5.5mm, which is not listed as an option.

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• 5.

There are 2 x 100W driving lights attached to a vehicle. If they draw somewhat 8.3A, when switched on, tell us what voltage the vehicle is. Ohm's Law: Voltage = Load / Current

• A.

6V

• B.

12V

• C.

24V

• D.

48V

C. 24V
Explanation
The correct answer is 24V. According to Ohm's Law, voltage is equal to the load divided by the current. In this case, the load is 200W (2 x 100W) and the current is 8.3A. By substituting these values into the formula, we can calculate the voltage. Therefore, 200W / 8.3A = 24V.

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• 6.

You are broken down at night with a flat rear tire. In the frustration of fitting the spare, you kick all 4 wheel nuts into the scrub on the side of the road and lose them. What is the easiest way to get going quickly?

• A.

Call the dealer, get 4 new wheel nuts sent out the following morning.

• B.

Phone for a tow truck, hoping they can tow the car backwards.

• C.

Take 1 wheel nut off the other 3 wheels. Now they all have 3 wheel nuts.

• D.

Take 2 wheel nuts off the other back wheel. Now both rear's have 2 wheel nuts.

C. Take 1 wheel nut off the other 3 wheels. Now they all have 3 wheel nuts.
Explanation
The easiest way to get going quickly in this situation is to take 1 wheel nut off the other 3 wheels. By doing this, all the wheels will still have 3 wheel nuts, which is the minimum requirement for safe driving. This solution allows the person to continue their journey without having to wait for new wheel nuts or a tow truck.

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• 7.

What's larger is the diameter? (in inches)

• A.

3/8"

• B.

3/16"

• C.

3/4"

• D.

3/2"

D. 3/2"
Explanation
Among the given options, the largest diameter, measured in inches, is 3/2 inches (3/2"). This means that the size of the circular object with a 3/2-inch diameter is bigger compared to the objects with the other specified diameters, which are 3/8", 3/16", and 3/4". In this context, "diameter" refers to the measurement across the center of a circle or circular object, representing its width.

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• 8.

A 48V forklift battery has individual 2V cells. There are how many cells?

• A.

12

• B.

18

• C.

24

• D.

48

C. 24
Explanation
Since each individual cell has a voltage of 2V, to achieve a total voltage of 48V for the forklift battery, there must be 24 cells. This is because 2V multiplied by 24 cells equals 48V.

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• 9.

What type of screwdriver is this?

• A.

• B.

• C.

• D.

B. Phillips (Cross) head
Explanation
The correct answer is Phillips (Cross) head. This type of screwdriver is characterized by a cross-shaped head with a single slot in each arm of the cross. It is designed to be used with Phillips head screws, which have a corresponding cross-shaped recess. The Phillips head screwdriver is commonly used in many applications, particularly in woodworking and construction, as it provides better torque transfer and reduces the risk of cam-out compared to flathead screwdrivers.

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• 10.

If AC is Alternating Current, then DC is

• A.

Delivery Current

• B.

Direct Current

• C.

Diverted Current

• D.

Delta Current

B. Direct Current
Explanation
The correct answer is Direct Current because it is the opposite of Alternating Current (AC). Direct Current is the flow of electric charge in one direction only, while Alternating Current changes direction periodically. Therefore, DC is the appropriate term to describe the type of current that flows continuously in a single direction.

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Matt Balanda |BS, Science |
Physics Expert
Matt graduated with a Master's in Educational Leadership for Faith-Based Schools from California Baptist University and a Bachelor's of Science in Aerospace Engineering and Mathematics from the University of Arizona. A devoted leader, transitioned from Aerospace Engineering to inspire students. As the High School Vice-Principal and a skilled Physics teacher at Calvary Chapel Christian School, his passion is nurturing a love for learning and deepening students' connection with God, fostering a transformative educational journey.

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• Feb 09, 2024
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• Feb 14, 2009
Quiz Created by
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