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WorksheetsDiesel Engine Cooling Systems
Total questions: 12
Worksheet time: 12mins
Name
Class
Date
1.
With reference to Figure 13-6, the easiest way to locate the thermostat(s) on a current on-highway diesel engine is to locate the __________.
a)
Upper radiator hose
b)
Lower radiator hose
c)
Radiator fill hose
d)
Coolant fill line
2.
What percentage of cooling system breakdowns is due to poor maintenance?
a)
30%
b)
40%
c)
50%
d)
60%
3.
Technician A says cooling systems must provide for the expansion of coolant. Technician B says propylene glycol is considered toxic and coolant must not escape into the environment through overflow hoses. Who is correct?
a)
Technician A
b)
Technician B
c)
Both Tech A and B
d)
Neither Tech A or B
4.
Technician A says aeration is the condition in which excessive amounts of air or steam bubbles are dissolved in coolant, diminishing the coolant's effectiveness. Technician B says cooling systems must provide for de-aeration of coolant to prevent pumps and coolant passageways in the cylinder head from becoming air bound, or blocked by an accumulation of steam. Who is correct?
a)
Technician A
b)
Technician B
c)
Both Tech A and B
d)
Neither Tech A or B
5.
An environmentally friendly liquid coolant is __________.
a)
Electrolyte
b)
Propylene glycol
c)
Ethylene glycol
d)
None of these are correct.
6.
Optimum water to coolant mix is __________.
a)
60/40
b)
30/70
c)
50/50
d)
40/60
7.
Technician A says regular tap water is best for cooling systems. Technician B says a 50/50 mixture is optimal for removing heat and providing corrosion protection. Who is correct?
a)
Technician A
b)
Technician B
c)
Both Tech A and B
d)
Neither Tech A or B
8.
Technician A says a vacuum valve incorporated into the cap allows air or coolant to re-enter the cooling system when the pressure drops after the engine cools. Technician B says that when the cooling system is pressurized the pump operates much better than the 65% efficiency without pressure cap. Who is correct?
a)
Technician A
b)
Technician B
c)
Both Tech A and B
d)
Neither Tech A or B
9.
Which coolant hose clamp design has been determined to be used to minimize coolant loss?
a)
Double clamp
b)
Gear clamp
c)
Shrink tube clamp
d)
Constant torque spring clamp
10.
A coolant’s freeze point protection can be verified with a(n) __________.
a)
Refractometer
b)
Volt meter
c)
Infrared sensor
d)
Thermometer
11.
Which cleaning agent type is recommended to clean a cooling system contaminated with oil and fuel?
a)
Mild acid type
b)
Alkaline type
c)
Caustic soda type
d)
All are correct.
12.
Conventional engine coolant should be flushed and changed every __________ months.
a)
12
b)
24
c)
36
d)
48
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