Automotive Mechanics 1, 1st Edition By May – Test Bank

Chapter 11 Testbank Key

1. Name seven components that make up a basic liquid cooling system.
– radiator
– water pump
– water-jackets
– radiator hoses
– thermostat
– fan
– coolant.

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Medium
Section: Basic cooling system

2. (p. ) What are the three methods of heat transfer?
Conduction, convection and radiation.

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Easy
Section: Heat transfer

3. (p. ) Name two functions of a coolant.
A coolant:
– protects against corrosion
– acts as an antifreeze.

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Easy
Section: Coolant

4. (p. ) The cooling system not only removes heat, but is responsible for keeping the engine as cool as possible.
FALSE

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Medium
Section: Basic cooling system

5. (p. ) The difference between heat and temperature is heat is energy and temperature is the intensity of it.
TRUE

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Medium
Section: Heat and temperature

6. (p. ) Generally, when heated, substances will contract.
FALSE

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Easy
Section: Heat and temperature

7. (p. ) The transfer of heat by the movement of molecules that become less dense and move upwards is known as conduction.
FALSE

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Medium
Section: Heat transfer

8. (p. )
Where does the coolant flow within the cooling system while the thermostat is closed?

A.
Coolant bypasses the heater core.

B.
Coolant circulates within the radiator only.

C.
Coolant flows reversed through the engine and radiator.

D.
Coolant circulates within the engine only.

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Medium
Section: Liquid-cooling systems

9. (p. ) A fan shroud is designed to:
A. protect the technician’s hands
B. increase the fan’s efficiency
C. protect the engine from dust and dirt
D. increase fan speed

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Medium
Section: Cooling system problems

10. (p. ) The purpose of variable speed fans is to:
A. conserve energy
B. change speed according to engine speed
C. maintain thermal efficiency
D. increase cooling speed

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Medium
Section: Cooling-system components

11. A bi-metal or bi-metallic spring is:
A. a metal spring for closing the thermostat
B. a special type of coil spring
C. a spring consisting of a bicarbonate compound
D. a spring made of two different metals

Competency: AURTTC3003 Diagnose and repair cooling systems
Difficulty: Hard
Section: Cooling-system components

12. (p. ) What is the purpose of the thermostat?
A. To vary fluid flow dependent on temperature.
B. To control the required flow through the radiator.
C.
All of the options given here are correct.

D. To allow decreased engine warm-up time.

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Hard
Section: Cooling-system components

13. Additional liquid-to-liquid heat exchangers are fitted within the radiator most commonly:
A. for power steering requirements
B. for engine oil requirements
C. for automatic transmissions
D. for turbochargers

Competency: AURTTC3003 Diagnose and repair cooling systems
Difficulty: Medium
Section: Radiator assembly

14. (p. ) In a cross-flow radiator, fluid flow is from:
A. diagonally
B. bottom to top
C. one side to the other
D. top to bottom

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Easy
Section: Radiator assembly

15. (p. ) Coolant boiling point is raised because of the:
A. thermostat
B. radiator cap vacuum valve
C. increased pressure within the system
D. raised temperature of the coolant

Competency: AURTTC2001 Inspect and service cooling systems
Difficulty: Hard
Section: Radiator pressure cap and reservoir

16. (p. ) What is the function of the radiator cap?
A. It prevents excessive pressure.
B. All of the options given here are correct.
C. It allows recovery of fluid when cooling.
D. It prevents a negative pressure in the cooling system.