Diesel Cooling Systems TEST

A propylene glycol anti-freeze concentration of 60% volume produces a freeze point protection of __________.

• 19°F

• -27°F

• -76°F

• -56°F

The most significant additive that prevents cavitation is __________.

• Distilled water

• Glycol

• Nitrate

• Silicate

Every 1 psi increase in cooling system operating pressure will increase the cooling system’s boiling point by __________ºF.

• 1

• 2

• 3

• 4

At temperatures above __________, oil can quickly oxidize and even burn.

• 225°F (107°C)

• 250°F (121°C)

• 275°F (135°C)

• 290°F (143°C)

Technician A says cooled exhaust gas recirculation (EGR) places an even larger heat load on the cooling system. Technician B says

engine modifications to deal with the increased heat loads include larger water pumps, cooling fans, and radiator cross-sectional areas.

Who is correct?

• Tech A

• Tech B

• Both Techs

• Neither Tech

An environmentally friendly liquid coolant is __________.

• Electrolyte

• Propylene Glycol

• Ethylene Glycol

• None of these are correct

Distilled water is best used with coolant mix because it has __________.

• Lots of minerals

• No minerals

• No cost as it comes from the tap

• A higher boiling point

Which of the following statements about types of coolant is correct?

• Heavy-duty and automotive diesel engines depend almost exclusively on the efficiency of liquid cooling systems.

• Water, mixed with anti-freeze and other ingredients, is the primary coolant medium to absorb engine heat.

• Both of these

• Neither of these

Which of the following statements about anti-freeze formulation is correct?

• Development of anti-freeze formulation is an evolutionary process driven by the requirements to minimize corrosion and erosion in the cooling

  system and to ensure material compatibilities.

• The additive package essentially differentiates between the various types of coolants.

• Both of these

• Neither of these

What type of coolant is designated with the color green?

• Type 1

• Type 2

• Type 3

• Type 4