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WorksheetsDiesel Cooling Systems TEST
Total questions: 20
Worksheet time: 10mins
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
Thermostat operational movement is controlled by a(n) __________.
Engine control module
Electrical temp sensor
Mechanical wax pellet
Dingle valve
Technician A says engine fans are designed to increase the airflow across the radiator, which improves the efficiency of heat removal from coolant.
Technician B says to reduce the parasitic loss of power from the engine, which is often more than 15 horsepower (hp) (11 kilowatts [kW]) on some
heavy-duty fans, a fan drive mechanism is used to decouple the fan from the engine when airflow is not required. Who is correct?
Tech A
Tech B
Both Techs
Neither Tech
Under fast acceleration, internal engine block pressures between the pump and thermostat can reach as high as ___________.
10psi
20psi
30psi
40psi
Technician A says all diesel engines are equipped with water filters. Technician B says water filters can remove sediment, rust and, dissolved particles
that can cause abrasive damage to the cooling system. Who is correct?
Tech A
Tech B
Both Techs
Neither Tech
A radiator cap vacuum valve failure is generally associated with a __________.
Coolant leak
Collapsed upper radiator hose
Collapsed lower radiator hose
Slipping water pump drive
A coolant’s freeze point protection can be verified with a(n) __________.
Refractometer
Volt meter
Infrared sensor
Thermometer
Conventional engine coolant should be flushed and changed every __________ months.
12
24
36
48
Technician A says that defective air operated switches and valves can be misdiagnosed as cracked cylinder head. Technician B says that a defective air
compressor can be misdiagnosed as cracked cylinder head. Who is correct?
Tech A
Tech B
Both Techs
Neither Tech
Which is the recommended tool to verify a thermostatic fan clutch is operating properly?
Digital tachometer
Optical tachometer
Speed sensor
All of these are correct
Which cleaning agent type is recommended to clean a cooling system contaminated with oil and fuel?
Mild acid type
Alkaline type
Caustic soda type
All of these are correct
