Automotive Service Modern Automotive Technology Study Guide for

Automotive Service 1. The term “air conditioning” generally means controlling the __________, and flow

Automotive Service 2. A ____________ system, and a __________system are used to provide a

Automotive Service 3. To learn refrigeration principles, the 3 states of matter, _____________, and

Automotive Service 4 -7. Heat always moves from ______ to ______ objects and is

Automotive Service 8. The ________________ (Btu) is the unit for measuring the quantity of

Automotive Service 9. ____________ & __________ generally refer to liquid changing into a vapor.

Automotive Service 10. ____________, the opposite of vaporization, is when a vapor changes back

Automotive Service 11. When pressure is applied to a substance, its ________ increases. (the

Automotive Service 12. ________ is the substance with a very low boiling point that

Automotive Service 13. Both R-____ and R-____ are found in automotive A/C systems. R-12

Automotive Service 14 -17. Refrigerant goes through four phases during the “refrigeration cycle”: C)

Automotive Service 18 -21. The four basic parts of the A/C system are the:

Automotive Service 22 -25. In addition to the 4 basic parts to accomplish the

Automotive Service 26. A/C’s 4 functions are to ________, ___________ and _________ the air.

Expansion Valve Coolant Recovery Reservoir Evaporator Accumulator Blower Motor Radiator Water Pump Heater Core

Automotive Service 27. VALVES, DUCTS, FLAPS, (moved by either vacuum motors or electric servos)

Automotive Service 28. The two major divisions of an A/C system are the _____

Automotive Service 29. The high pressure/high temperature side is under the HOOD, while the

Automotive Service 30. The A/C compressor is engaged and disengaged by an electromagnetic _____.

Automotive Service 31. A very pure, highly refined, high-viscosity refrigerant _______ circulates with refrigerant

Automotive Service 32. Special high-pressure (250 psi) refrigerant lines & _______ carry the R-12

Automotive Service 33. The condenser, located in front of the ________, transfers heat to

Automotive Service 34. The receiver-drier may be equipped with a ___________ to allow observation

Automotive Service 35. Compressors are actually piston pumps, similar to engines, and need a

Automotive Service 36. An ______ tube or an _________ Valve control R-134 a flow

Automotive Service 37. There are many types of switches used to control A/C operation,

Automotive Service 38. The heating system uses a small, radiator-like unit called the _______

Automotive Service 39. HVAC DUCTS & VENTS can be operated by ELECTRIC switches, mechanical

Automotive Service 40. Many vehicles now use a _________ compartment air filter known as

Automotive Service ASE-Type Questions [pages 1491 & 1492] Circle your choice for the correct

Slides: 47

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Automotive Service Modern Automotive Technology Study Guide for Chapter 75 Pages 1469 - 1492 Heating, Ventilation, & Air Conditioning 65 Points

Automotive Service 1. The term “air conditioning” generally means controlling the __________, and flow of air in the passenger compartment of a vehicle. Temperature, Humidity Temperature, Circulation Temperature, Direction

Automotive Service 2. A ____________ system, and a __________system are used to provide a comfortable passenger environment in all weather conditions. Refrigeration Heating Ventilation

Automotive Service 3. To learn refrigeration principles, the 3 states of matter, _____________, and ______ (vapor) must be understood. Also know that: heat is the controlling factor in the states of matter.

Automotive Service 4 -7. Heat always moves from ______ to ______ objects and is transferred in three ways: ______ is heat transfer through objects touching each other ______ is heat transfer caused by air moving past surrounding objects ______ is heat transfer commonly caused by infrared (invisible) waves From Hotter to Colder From More Heat Toward Less Heat

Automotive Service 8. The ________________ (Btu) is the unit for measuring the quantity of heat transfer from one object to another. Degrees are our method of measuring heat intensity. Bonus Thermal Unit British Thermal Unit Bahamas Thermal Unit

Automotive Service 9. ____________ & __________ generally refer to liquid changing into a vapor. Heat is absorbed to make this change. Absorbing heat boils refrigerant just like absorbing heat boils water in a kettle. Vaporization & Evaporation Vaporization & Condensation & Evaporation

Automotive Service 10. ____________, the opposite of vaporization, is when a vapor changes back into a liquid. Heat is given off when this change is made. Refrigeration Condensation Ventilation

Automotive Service 11. When pressure is applied to a substance, its ________ increases. (the inverse is true also) Temperature Volume Displacement

Automotive Service 12. ________ is the substance with a very low boiling point that exchanges heat (is the refrigeration medium) in an A/C system.

Automotive Service 13. Both R-____ and R-____ are found in automotive A/C systems. R-12 is a CFC & is being phased out. R-134 a is a HFC

Automotive Service 14 -17. Refrigerant goes through four phases during the “refrigeration cycle”: C) __________________ E) __________________ (vaporization) Blue = Low Pressure Red = High Pressure Condensation Expansion Compression Evaporation Start Here

Automotive Service 18 -21. The four basic parts of the A/C system are the: C) _________________________________ E) _________________________________

Automotive Service

Automotive Service 22 -25. In addition to the 4 basic parts to accomplish the basic refrigeration cycle, ___________ circulates through the system, a ______ (fan) is used to circulate air, (motor & squirrel cage fan) a _______-_______ or an _________ containing a desiccant, stores and removes moisture from the refrigerant and finally, some type of thermostatic switch cycles the compressor on & off to prevent evaporator freezing. Blower Refrigerant Receiver-Drier or Accumulator

Automotive Service

Automotive Service 26. A/C’s 4 functions are to ________, ___________ and _________ the air. Cool Dehumidify Clean Circulate

C. D. 4. F. E. 2. 3. 1. 5. A. B.

Expansion Valve Coolant Recovery Reservoir Evaporator Accumulator Blower Motor Radiator Water Pump Heater Core Cooling Fan Compressor Condenser

Automotive Service 27. VALVES, DUCTS, FLAPS, (moved by either vacuum motors or electric servos) & SWITCHES are used to direct the air flow under the dash.

Automotive Service 28. The two major divisions of an A/C system are the _____ side and the ____ side. High Side in the Engine Compartment Low Side in the Passenger Compartment

Automotive Service 29. The high pressure/high temperature side is under the HOOD, while the PASSENGER compartment is the area where the low pressure/low temperature side of the system operates.

Automotive Service 30. The A/C compressor is engaged and disengaged by an electromagnetic _____. Clutch Crutch Dutch

Automotive Service 31. A very pure, highly refined, high-viscosity refrigerant _______ circulates with refrigerant for lubrication. Water Coolant Oil

Automotive Service

Automotive Service 32. Special high-pressure (250 psi) refrigerant lines & _______ carry the R-12 or R-134 a through the system. Hoses

Automotive Service 33. The condenser, located in front of the ________, transfers heat to the outside, air. Headlights Radiator Back Seat

Automotive Service 34. The receiver-drier may be equipped with a ___________ to allow observation of refrigerant flow. It always has a desiccant inside to act as a drying agent, removing moisture from the refrigerant.

Automotive Service 35. Compressors are actually piston pumps, similar to engines, and need a _________ to quiet them. Muffler Radiator Balancer

Automotive Service 36. An ______ tube or an _________ Valve control R-134 a flow through the evaporator. Orifice Tube or Expansion Valve

Automotive Service

Automotive Service 37. There are many types of switches used to control A/C operation, both ______ & _______ pressure cutout switches as well as ambient temperature switches limit operation to prevent system damage. Low & High Crashing & Burning Freezing & Boiling

Automotive Service 38. The heating system uses a small, radiator-like unit called the _______ and the same squirrel cage fan & blower motor as the A/C system to circulate warm air through the passenger compartment. Heater Core Repeater Core Curriculum Core

Automotive Service 39. HVAC DUCTS & VENTS can be operated by ELECTRIC switches, mechanical LEVERS & CABLES, vacuum switches and motors or electronic control units like computers and sensors.

Automotive Service 40. Many vehicles now use a _________ compartment air filter known as a cabin air filter.

Automotive Service

Automotive Service ASE-Type Questions [pages 1491 & 1492] Circle your choice for the correct answer 1. A B C D AC theory 2. A B C D matter 3. A B C D conduction 4. A B C D heat transfer 5. A B C D evaporation 6. A B C D condensation 7. A B C D pressure 8. A B C D refrigerant

Automotive Service