Question 1

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 2

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 port 
A) fan 
B) sending unit 
C) clutch 
D) exhaust port A

Question 3

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

Accepted Answer

A) True 
 B)False  True

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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. 
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.

Question 6

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 7

All automotive coolants are glycol based.

Accepted Answer

A) True 
 B)False

Question 8

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. 
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.

Question 9

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 clutch 
A) thermostat 
B) exhaust port 
C) vacuum valve 
D) fan clutch

Question 10

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 11

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 12

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

Question 13

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 14

Why are cooling systems pressurized?

Accepted Answer

Cooling systems are pressurize

Question 15

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 16

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 17

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

Accepted Answer

variable d

Question 18

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 connections 
A) Extended-life antifreeze 
B) Good pressure cap 
C) Spark plugs 
D) Tight connections

Question 19

What are the components of a liquid cooling system?

Accepted Answer

A liquid cooling system is mad

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 20: Cooling System Theory

What is the purpose of the radiator shroud?

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:

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

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

All of the following statements are true EXCEPT:

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

All automotive coolants are glycol based.

Which of the following is LEAST-Likely to occur?

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

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

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

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?

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

Why are cooling systems pressurized?

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?

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

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

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

What are the components of a liquid cooling system?

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

Introduction to the Automobile

Automotive Careers and Technician Certification

Shop Safety

Shop Management, Service Records, and Parts

Locating Service Information and Specifications

Measuring Tools and Systems

Hardware, Fasteners, Drills, and Thread Repair

Shop Tools

General Shop Equipment

Cleaning Equipment and Methods

Lifting Equipment and Air Compressors

Engine Lubrication

Underhood and Body Inspection Vehicle on Ground

Undercar Inspection and Service

Introduction to the Engine

Engine Classifications and Types

Engine Size and Measurements

Engine Upper End

Engine Lower End and Lubrication System Theory

Cooling System Service

Automotive Belts

Automotive Hoses

Automotive Plumbing: Tubing and Pipe

Basic Electrical System Theory and Repairs

Battery Fundamentals

Battery Service

Starting System Fundamentals

Starting System Service

Charging System Fundamentals

Charging System Service

Lighting and Wiring Fundamentals

Lighting and Wiring Service

Safety, Security, Comfort Systems, and Electrical Accessories

Heating and Air-Conditioning Fundamentals

Heating and Air-Conditioning Service

Ignition System Fundamentals

Ignition System Service

Petroleum Fuels and Alternative Fuel Technologies

Fuel System Fundamentals, Gasoline and Diesel

Fuel System Service

Intake and Exhaust Systemsturbochargers and Superchargers

Emission Control System Fundamentals, Gasoline and Diesel

Emission Control System Service

Electronics and Computer Systems Fundamentals

Electronics and Computer Systems Service

Advanced Emission and On-Board Diagnostics Obd

Diagnosing Engine Performance Problems

Diagnosing Engine Mechanical Problems

Engine Removal and Disassembly

Engine Sealing Gaskets, Fastener Torque

Engine Diagnosis and Service: Cylinder Head and Valve Train

Engine Diagnosis and Service: Block, Crankshaft, Bearings, and Lubrication System

Engine Diagnosis and Service: Piston, Piston Rings, Connecting Rod, Engine Balancing

Ordering Parts, Short and Long Blocks, Engine Assembly

Engine Installation, Break-In, and In-Chassis Repairs

Brake Fundamentals

Brake Service

Antilock Brakes, Traction, and Stability Control

Bearings, Seals, and Greases