Question

15 multiple choice 1 point
what is the purpose of oil control rings?
to scrape oil off of cylinder walls and return it to to the crankcase
to lubricate and clean the camshaft(s)
to lubricate and cool wrist pins
to lubricate cylinder walls
16 multiple choice 1 point
what is the purpose of glow plugs in diesel engine?
to maintain a consistent engine temperature
to ignite the fuel/ air mixture
to maintain a consistent oil temperature
to heat the cylinder head to aid in cold start igniton

Explanation:

• Question 15: Oil control rings are designed to scrape oil off the cylinder walls and return it to the crankcase. This helps in maintaining proper lubrication levels and preventing excessive oil consumption.
• Question 16: Glow plugs in a diesel engine are used to heat the cylinder head. This aids in cold - start ignition as diesel engines rely on compression heating, and glow plugs provide an additional heat source when starting from cold.

Answer:

1. To scrape oil off of cylinder walls and return it to to the crankcase
2. to heat the cylinder head to aid in cold start igniton