Spark Plug Quiz

What material is the ceramic insulator of a spark plug made from?

• Aluminum oxide

• Copper

• Steel

• Plastic

What is the purpose of the ribs on the ceramic insulator of a spark plug?

• To increase the surface area of the insulator to reduce flashover to ground

• To improve the spark plug's appearance

• To make the spark plug lighter

• To help in the installation of the spark plug

What are the four thread diameter sizes for spark plugs?

What happens if the spark plug temperature is too low?

• The plug may overheat

• The plug may cause engine knocking

• Carbon and combustion chamber deposits will not be burned off

• The plug may cause misfiring

What happens if the spark plug temperature is too high?

• The plug may overheat, damaging the electrodes

• The plug may cause engine knocking

• The plug may cause misfiring

• The plug may cause increased fuel consumption

What percentage of heat is absorbed by the intake stroke fresh air?

• 10%

• 20%

• 30%

• 40%

What percentage of heat is absorbed by the insulator and spark plug side walls?

• 10%

• 20%

• 30%

• 40%

What percentage of heat is absorbed by spark plug wires?

• 1%

• 2%

• 3%

• 4%

What is the consequence of incorrect spark plug reach?

• Improved fuel efficiency

• Engine running problems or spark plug damage

• Reduced emissions

• Increased horsepower

What type of spark plug has multiple ground electrodes?

• Resistor spark plugs

• Surface discharge plugs

• Multiple electrode plugs

• Cold spark plugs