Question 1

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

Accepted Answer

A) True 
 B)False  True

Question 2

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. Cylinder walls vibrate during combustion, breaking off the rust. The coolant carries the rust to other cooling system areas. Hard water forms mineral deposits. The resulting corrosion interferes with heat transfer even before the results of it plug the radiator and fill the waterjackets with sediment.

Question 3

All automotive coolants are glycol based.

Accepted Answer

A) True 
 B)False  True

Question 4

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

Accepted Answer

variable d

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

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 7

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 8

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 9

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 10

All of the following statements are true EXCEPT:

Accepted Answer

A)  the disadvantage of a belt-driven fan is that at higher speeds, when the fan is no longer required, it can rob the engine of horsepower. 
B)  a flex fan has blades with a flexible trailing edge and a rigid leading edge. 
C)  fan blades are made of aluminum, flexible plastic, or steel. 
D)  a fan clutch increases horsepower requirements. 
A)  the disadvantage of a belt-driven fan is that at higher speeds, when the fan is no longer required, it can rob the engine of horsepower. 
B)  a flex fan has blades with a flexible trailing edge and a rigid leading edge. 
C)  fan blades are made of aluminum, flexible plastic, or steel. 
D)  a fan clutch increases horsepower requirements.

Question 11

While discussing thermostats, Technician A says that the installation of a lower temperature rating thermostat will result in a cooler running engine. Technician B says that it will simply result in the engine operating temperature being lower during cooler weather. 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 12

What are the components of a liquid cooling system?

Accepted Answer

A liquid cooling system is mad

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

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 15

Technician A says that coolant is a 50/50 mixture of antifreeze and water. Technician B says the terms coolant and antifreeze are used interchangeably by their manufacturers.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 16

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

Question 17

The MOST-Likely indicator of a slow rise in temperature or a fast rise due to a stuck-closed thermostat is the:

Accepted Answer

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

Question 18

If a car has a(n) ____ fuel system, that system will not operate until its sensors have all reached a predetermined operating temperature.

Accepted Answer

A)  cross-flow 
B)  preignition 
C)  open loop 
D)  computer feedback 
A)  cross-flow 
B)  preignition 
C)  open loop 
D)  computer feedback

Question 19

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 20

What is the purpose of the radiator shroud?

Accepted Answer

The radiator shroud makes the

Exam 20: Cooling System Theory

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

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?

All automotive coolants are glycol based.

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

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

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

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

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

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

All of the following statements are true EXCEPT:

While discussing thermostats, Technician A says that the installation of a lower temperature rating thermostat will result in a cooler running engine. Technician B says that it will simply result in the engine operating temperature being lower during cooler weather. Who is correct?

What are the components of a liquid cooling system?

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

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

Technician A says that coolant is a 50/50 mixture of antifreeze and water. Technician B says the terms coolant and antifreeze are used interchangeably by their manufacturers.Who is correct?

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:

The MOST-Likely indicator of a slow rise in temperature or a fast rise due to a stuck-closed thermostat is the:

If a car has a(n) ____ fuel system, that system will not operate until its sensors have all reached a predetermined operating temperature.

Which of the following is LEAST-Likely to occur?

What is the purpose of the radiator shroud?

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 Car on Ground

Undercar Inspection and Service

Introduction to the Engine

Engine Classifications and Advanced Transportation Technologies

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

Fuels and Alternative Fuels

Fuel System Fundamentals

Fuel System Service

Intake and Exhaust Systems, Turbochargers and Superchargers

Emission Control System Fundamentals

Emission Control System Service

Electronics and Computer Systems Fundamentals

Electronics and Computer Systems Service

Advanced Emissions and On-Board Diagnostics Odb

Diagnosing Engine Performance Problems

Diagnosing Engine Mechanical Problems

Engine Removal and Disassembly

Engine Sealing, Gaskets, Fastener Torque

Engine Diagnosis and Service: Cylinder Head and Valvetrain

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

Brakes Service

Anti-Lock Brakes Traction and Stability Control

Bearings, Seals, and Greases