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WorksheetsWeek 9 Cooling Systems Study Guide
Total questions: 25
Worksheet time: 13mins
A propylene glycol anti-freeze concentration of 60% volume produces a freeze point protection of __________.
19°F
-27°F
-76°F
-56°F
Which additive in coolant is the most effective at preventing cavitation?
Distilled water
Glycol
Nitrate
Silicate
The boiling point of water in a cooling system is increased by 1 degree Fahrenheit for every ________ increase in pressure.
4psi
3psi
2psi
1psi
What temperature will oil begin to oxidize and could even burn?
225°F (107°C)
250°F (121°C)
275°F (135°C)
290°F (143°C)
A water cooled EGR valve would do which of these to your cooling system?
Lower coolant temperatures because of expanding gasses causing adiabatic cooling
More soot in your cooling system, necessitating a water system filter
Put more stain on the cooling system since it has to cool down even more
A smaller cooling system capacity
Which of these would you use to make a cooling system that can handle more heat?
Larger water pump
Addition of cooling fans
Radiator cross sectional areas
All of these help to handle high heat loads
Which coolant is environmentally friendly?
Electrolyte
Propylene glycol
Ethylene glycol
None of these is correct
Why would you use distilled water in your cooling system over plain tap water?
distilled water has lots of minerals that can help with cooling
Distilled has no minerals in it.
Free, because distilled water comes from the tap
Distilled water has a higher boiling temp
Heavy duty and automotive diesels efficiency rely almost exclusively on which system?
The cooling system
The fuel injection system
The turbo
The DPF
What is the primary way that heavy duty diesels remove heat?
Air flow
A water and coolant mix
Exhaust
Oil
Which of these is true about the evolution of antifreeze?
Increase the cooling properties
Prevent coolant evaporation
Minimize corrosion and erosion while also being compatible with materials
Making coolant easier to find or purchase for your vehicle
What differentiates between the different types of coolant?
Cooling capacity
Resistance to gelling up
Whether its for a diesel or gasoline engine
The additive package
Which type of coolant is dyed green?
Type 1
Type 2
Type 3
Type 4
The thermostat is operated by which of these?
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 high acceleration, the pump and thermostat can see pressures as high as _____.
10 psi (69 kPa)
20 psi (138 kPa)
30 psi (207 kPa)
40 psi (276 kPa)
Which of these is true about water filters?
All diesel engines have water filters
Water filters remove rust and dissolved particles
Water filters remove excess glycol
Water filters are only used on systems with low pressure
A collapsed radiator upper hose is usually a sign of what?
Coolant leak
Radiator cap vacuum valve failure
Slipping water pump drive
Broken water pump impeller
What tool will tell you the freezing point of antifreeze?
Refractometer
Volt meter
Infrared sensor
Thermometer
Conventional coolant should be changed how often?
12 months
24 months
36 months
48 months
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
What tool would you use on a fan clutch to see if its working properly?
Digital tachometer
Optical tachometer
Speed sensor
All of these are correct
What type of cleaning agent would you use to clean a system of oil and fuel?
Mild acid type
Alkaline type
Caustic soda type
All of these are correct
Which of these are engine damaging deposits that maintenance and coolant type seek to remove?
Calcium deposits
Magnesium deposits
Both of these
Neither of these are harmful deposits in an engine cooling system
Early radiator caps simply stopped water from spilling over. What do modern caps do?
Increase coolant pressure
Allow water or air to re-enter the system when pressure drops
They perform both of these functions
Modern radiator caps don't do either of these functions
