Question

an automotive engine that running at too high of a temperature will have which of these?
○ high thermal inefficiency
○ excessive oil consumption
○ poor cooling system circulation
○ high oxides of carbon

question 10
pressurizing the automotive cooling system results in ______.
○ reduced engine temperature
○ increased coolant boiling point
○ reduced coolant boiling point
○ increased coolant warm up rate

question 11
if a cooling system operates at too cool of a temperature, the engine will ______.
○ pre-ignite or detonate
○ produce higher emissions
○ produce more torque
○ have more efficiency

Explanation:

First Question (Automotive Engine High Temperature)

To determine the effect of an automotive engine running at too high a temperature:

• High thermal inefficiency: While high temp can affect efficiency, it's not the direct typical effect.
• Excessive oil consumption: High engine temp can cause oil to break down or seals to leak, leading to excess oil use.
• Poor cooling system circulation: This is a cause of high temp, not an effect.
• High oxides of carbon: Related to combustion, not direct temp effect.

So the correct option is Excessive oil consumption.

For pressurizing an automotive cooling system:

• Reduced engine temp: Pressurization doesn’t directly reduce temp; it improves cooling efficiency.
• Increased coolant boiling point: Pressure and boiling point are related (higher pressure → higher boiling point, by physics principles like vapor pressure).
• Reduced coolant boiling point: Opposite of physics principles.
• Increased coolant warm up rate: Pressurization doesn’t affect warm - up rate.

Thus, pressurizing increases the coolant’s boiling point.

For a cooling system operating too cool:

• Pre - Ignite or detonate: More likely with high temp, not low.
• Produce higher emissions: A cool engine doesn’t burn fuel efficiently, leading to incomplete combustion and higher emissions.
• Produce more torque: Torque is related to engine design/load, not cooling temp.
• Have more efficiency: Cool engines are less efficient (inefficient combustion).

So the engine produces higher emissions.

Answer:

B. Excessive oil consumption (assuming options are labeled A - D as per typical MCQ; adjust identifier if needed)

Question 10 (Pressurizing Cooling System)