Question 1

The part that is MOST-Likely to draw air through the radiator when the vehicle is not moving fast enough to provide enough air circulation is the:

Accepted Answer

A)  fan
B)  sending unit
C)  clutch
D)  exhaust portE) A) and B)
F) B) and C) A

Question 2

Technician A says that the most common type of coolant is a 50/50 mixture of antifreeze and water. Technician B says that, depending on its intended use, engine coolant can be a combination of any mixture of water and/or other fluids. Who is correct?

Accepted Answer

A)  A only
B)  B only
C)  Both A and B
D)  Neither A nor BE) B) and C)
F) A) and D)

Question 3

Which of the following is LEAST-Likely to occur?

Accepted Answer

A)  Pure ethylene glycol freezing at 150F.
B)  Pure ethylene glycol boiling at 3300F.
C)  Factory radiator fill being about 50% water and 50% coolant.
D)  A 70% concentration of ethylene glycol freezing at -850F.E) B) and C)
F) A) and B)

Question 4

Which of the following is LEAST-Likely to help control cavitation?

Accepted Answer

A)  Extended-life antifreeze
B)  Good pressure cap
C)  Spark plugs
D)  Tight connectionsE) B) and D)
F) C) and D)

Question 5

Pure water has 1.4 times the heat-carrying ability of pure ethylene glycol, so water would be the best coolant to use if the only consideration in selection of a coolant was its ability to carry off heat. What are its other limitations?

Accepted Answer

It forms rust on iron engine parts. Cyli...

Question 6

Coolant exits from the bottom of the radiator after it is cooled.

Accepted Answer

A) True 
 B)False

Question 7

There are two types of wax pellet thermostats commonly used in pressurized cooling systems: the diaphragm and the ____________________ actuator.

Accepted Answer

The answer of There are two types of wax pellet...

Question 8

Provide three reasons why the thermostat should allow the coolant to quickly reach and maintain a high enough temperature.

Accepted Answer

1. Its oil becomes thinner. Thinner oil ...

Question 9

What are the components of a liquid cooling system?

Accepted Answer

A liquid cooling system is mad...

Question 10

A constant pressure cap has no spring on the vacuum valve.

Accepted Answer

A) True 
 B)False

Question 11

What is the purpose of the radiator shroud?

Accepted Answer

The radiator shroud makes the fan far more effective at pulling air through the radiator. If the fan shroud is damaged or missing, the vehicle could overheat in traffic.

Question 12

Centrifugal pumps are ____________________, which means that their output changes with speed.

Accepted Answer

variable d...

Question 13

Blowby, which is exhaust gas that escapes past the rings during combustion, increases when the engine is hot.

Accepted Answer

A) True 
 B)False

Question 14

Each pound of pressure on the coolant raises its boiling point by about 3°F.

Accepted Answer

A) True 
 B)False  True

Question 15

The ____________________ thermostats used in automobiles have an expansive wax compound that expands at a predictable rate to open the valve in the thermostat.

Accepted Answer

The answer of The ____________________ thermostats used in automobiles have...

Question 16

All automotive coolants are glycol based.

Accepted Answer

A) True 
 B)False

Question 17

A car with an automatic transmission usually has a(n) ____________________ in the radiator.

Accepted Answer

The answer of A car with an automatic transmission usually...

Question 18

The ____ is usually located where the coolant leaves the top of the block, just below the upper radiator hose.

Accepted Answer

A)  thermostat
B)  exhaust port
C)  vacuum valve
D)  fan clutchE) A) and D)
F) B) and C)

Question 19

All of the following statements are true EXCEPT:

Accepted Answer

A)  sludge in the oil will increase if the engine is running at too cold a temperature for too long.
B)  sludge is a mixture of moisture, by-products of combustion, and water.
C)  high emissions and poor fuel economy result when an engine does not reach operating temperature.
D)  when an engine is warm, the thermostat is always open fully.E) All of the above
F) C) and D)

Question 20

Why are cooling systems pressurized?

Accepted Answer

Cooling systems are pressurize...

Exam 20: Cooling System Theory

The part that is MOST-Likely to draw air through the radiator when the vehicle is not moving fast enough to provide enough air circulation is the:

Correct AnswerverifiedA

Technician A says that the most common type of coolant is a 50/50 mixture of antifreeze and water. Technician B says that, depending on its intended use, engine coolant can be a combination of any mixture of water and/or other fluids. Who is correct?

Correct AnswerverifiedShow Answer

Which of the following is LEAST-Likely to occur?

Correct AnswerverifiedShow Answer

Which of the following is LEAST-Likely to help control cavitation?

Correct AnswerverifiedShow Answer

Pure water has 1.4 times the heat-carrying ability of pure ethylene glycol, so water would be the best coolant to use if the only consideration in selection of a coolant was its ability to carry off heat. What are its other limitations?

Correct AnswerverifiedIt forms rust on iron engine parts. Cyli...View AnswerShow Answer

Coolant exits from the bottom of the radiator after it is cooled.

Correct AnswerverifiedShow Answer

There are two types of wax pellet thermostats commonly used in pressurized cooling systems: the diaphragm and the ____________________ actuator.

Correct AnswerverifiedShow Answer

Provide three reasons why the thermostat should allow the coolant to quickly reach and maintain a high enough temperature.

Correct Answerverified1. Its oil becomes thinner. Thinner oil ...View AnswerShow Answer

What are the components of a liquid cooling system?

Correct AnswerverifiedA liquid cooling system is mad...View AnswerShow Answer

A constant pressure cap has no spring on the vacuum valve.

Correct AnswerverifiedShow Answer

What is the purpose of the radiator shroud?

Correct AnswerverifiedThe radiator shroud makes the fan far more effective at pulling air through the radiator. If the fan shroud is damaged or missing, the vehicle could overheat in traffic.

Centrifugal pumps are ____________________, which means that their output changes with speed.

Correct Answerverifiedvariable d...View AnswerShow Answer

Blowby, which is exhaust gas that escapes past the rings during combustion, increases when the engine is hot.

Correct AnswerverifiedShow Answer

Each pound of pressure on the coolant raises its boiling point by about 3°F.

Correct AnswerverifiedTrue

The ____________________ thermostats used in automobiles have an expansive wax compound that expands at a predictable rate to open the valve in the thermostat.

Correct AnswerverifiedShow Answer

All automotive coolants are glycol based.

Correct AnswerverifiedShow Answer

A car with an automatic transmission usually has a(n) ____________________ in the radiator.

Correct AnswerverifiedShow Answer

The ____ is usually located where the coolant leaves the top of the block, just below the upper radiator hose.

Correct AnswerverifiedShow Answer

All of the following statements are true EXCEPT:

Correct AnswerverifiedShow Answer

Why are cooling systems pressurized?

Correct AnswerverifiedCooling systems are pressurize...View AnswerShow Answer

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It forms rust on iron engine parts. Cyli...
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1. Its oil becomes thinner. Thinner oil ...
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A liquid cooling system is mad...
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The radiator shroud makes the fan far more effective at pulling air through the radiator. If the fan shroud is damaged or missing, the vehicle could overheat in traffic.

Correct Answer
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variable d...
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True

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Cooling systems are pressurize...
View Answer