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HVAC HAC 101 Final Summer 2025

Total questions: 55

Worksheet time: 36mins

Name
Class
Date
1.

What component exists in an orifice tube system and NOT a TXV system?

a)

Accumulator

b)

Differential

c)

Dryer

d)

Desiccant Pack

e)

Exhaust Filter

2.

Vaccum

a)

Raises the boiling point of a liquid

b)

Lowers the boiling point of a liquid

c)

Is created in the TXV

d)

Is created in the Condenser

3.

BTU:

(a)  

4.

InHg:

(a)  

5.

If water boils at 212 F.... What would the boiling point be under 31 PSI of pressure?

a)

296 F

b)

299 F

c)

305 F

d)

293 F

e)

292 F

6.

Another unit of measuring pressure besides Psi:

a)

Joules

b)

Kilopascals

c)

BTUs

d)

Calories

e)

GPM

7.

A substance used as a drying agent:

(a)  

8.

Customer states: AC not blowing cold. Gauges read 0 pressure on Both High and Low Side. What should be done next?

a)

Check Fuses

b)

Check Power and Ground at Compressor

c)

Vacuum and Leak Test

d)

Replace Valves

e)

Replace Valve Caps

9.

Compressor is cycling on and off. There is pressure in both High and Low side. What should be done next?

a)

Recover Refrigerant then Charge the right amount of Refrigerant

b)

Replace valves

c)

Replace Compressor

d)

Check Fuses

e)

Vacuum

10.

The correct name of the Valve Core:

a)

Poppet Valve

b)

Piston Valve

c)

Zerk Valve

d)

Schrader Valve

e)

Stem Fitting

11.

Compressor not engaging. Gauges showing pressure at 60 psi on both High and Low side. Fuses check out as good. What should be done next?

a)

Check Power and ground at Compressor

b)

Recover

c)

Charge .5 pound

d)

Charge 1.5 pounds

e)

Vaccum and Leak Test

12.

Low pressure liquid enters the evap and it exits as a:

a)

High Pressure Gas

b)

High pressure liquid

c)

Low pressure gas

d)

Low pressure liquid

13.

What are the two units of pressure measurement used in HVAC?

a)

Kpi/Joules

b)

Psi/Kpa

c)

Kpa/Calories

d)

BTU/Psi

e)

Psi/InHg

14.

Please Spell out CFC:

(a)  

15.

Customer states: AC only blowing cold when driving at high speeds. A likely cause might be...

a)

Bad Condenser Fan

b)

Low Refrigerant

c)

Compressor Inop

d)

Evap Drain Clogged

e)

None of the Above

16.

The ______ is the energy required to increase the temperature of one gram of water by one degree Celsius

a)

Joule

b)

Calorie

c)

Kelvin

d)

Kilopascal

e)

Yuengling

17.

The 609 license ensures that the technician knows how to repair the automotive air-conditioning systems.

a)

True

b)

False

18.

The ______ of the refrigerant system is designed to allow easy transformation of the refrigerant from a liquid to a gas.

a)

High side

b)

Low side

c)

Medium side

d)

None of the above

19.

The amount of heat required to raise the temperature of 1 pound of water at 32°F (0°C) and at atmospheric pressure by 1°F would be:

a)

1 kelvin.

b)

1 Btu.

c)

1 joule.

d)

1 rankine.

20.

_____, a member of the CFC family of gases, was the first common refrigerant to be used in an automotive air-conditioner.

a)

Hydrogen oxide

b)

Tetrafluoroethene

c)

Dichlorodifluoromethane

d)

Pentafluoro ethane

21.

The fixed orifice tube in an A/C system is a metering device that forces a high-pressure:

a)

gas into a low-pressure gas.

b)

gas into a low-pressure liquid.

c)

liquid into a low-pressure liquid.

d)

liquid into a low-pressure gas.

22.

What is the chemical name for R12?:

(a)  

23.

Quarter Turn shut off valve do?

a)

Manage the flow of coolant

b)

For florescent dye and UV lamp

c)

Electronic Leak Detector

d)

For the electrical system

e)

Regulate the flow of refrigerant

24.

What is the Low side pressure range with an ambient temp 57 degrees F?

a)

49-123 psi

b)

120-171 psi

c)

25-30 psi

d)

28-43 psi

25.

What is one of the relay terminals is the relay 12 Volt Battery Constant??

a)

30

b)

87

c)

85

d)

86

e)

54

26.

Which 2 terminals on the relay need to be contacted by the 9 volt battery to energize the coil?

a)

87 & 86

b)

87 & 30

c)

85 & 30

d)

85 & 86

e)

86 & 30

27.

The lubricant used with HFC-134a is;

a)

Mineral oil

b)

PAG or POE (ester) oil

c)

alkylbenzene oil

d)

whale oil

28.

PAG oil:

a)

Poly Alkylene Glycol

b)

Pre Acidic Glycerin

c)

Poly Alcohol Glycol

d)

Poly Alcohol Glycerin

29.

In the event of a large release of refrigerant in a confined area, IMMEDIATELY VACATE AND _______ the area

a)

Ventilate

b)

Humidify

c)

Detoxify

d)

Disenfect

e)

Haul Butt Out-Of

30.

. The EPA requires that a refillable refrigerant cylinder MUST NOT BE FILLED ABOVE ___% of its capacity by weight

a)

80

b)

90

c)

75

d)

85

31.

Some charging equipment as well as manifold gauges may have metric displays. A kilogram is equal to ___ pounds.

a)

3.0

b)

1.5

c)

3.5

d)

2.2

e)

2.5

32.

Tech A says HFO-1234yf is more flammable than R134a. Tech B says R134a isnt flammable at all. Who is correct?

a)

Tech A

b)

Tech B

c)

Both A and B

d)

Neither A nor B

33.

CO2 can be used as a refrigerant. Its refrigerant nomenclature (name) is:

a)

R202

b)

R744

c)

R152a

d)

1234yf

34.

The _______ plug can be manipulated using a jumper wire to initiate the compressor clutch to energize.

a)

High Side Pressure Switch

b)

Low Side Pressure Switch

c)

Compressor Relay

d)

Trinary Switch

e)

Sun Sensor

35.

The Trinary switch not only controls the compressor clutch ______ but also the _____

a)

Low Side Turn-On, Blower Motor Speed

b)

High Side Cut-Off, TXV orifice actuation

c)

High Side Cut-Off, Condenser Fan

d)

High Side Cut-Off, Compressor Relay Circuit

e)

Low Side Turn-On, Condenser Fan

36.

How many wires are in a trinary switch plug?

a)

1

b)

2

c)

3

d)

4

e)

None

37.

Which component in an automotive HVAC system is responsible for removing heat from the refrigerant and releasing heat to the outside?

a)

Expansion Valve

b)

Evap

c)

Condenser

d)

Compressor

38.

What does PAG stand for

(a)  

39.

The high pressure tubing near the compressor is usually _____

a)

Hot

b)

Expensive

c)

Fragile

d)

Flexible

e)

Crimped

40.

What kind of lubricating oil does R12 utilize?

a)

Castor Oil

b)

Mineral Oil

c)

Baby Oil

d)

5w40

e)

Extra Virgin Olive Oil

41.

The binary switch is on the HIGH side:

a)

False

b)

True

42.

The two wires on the binary switch are source voltage and compressor cutoff:

a)

True

b)

False

43.

Which component is responsible for reducing the pressure of the refrigerant before entering the evap?

a)

TXV

b)

Condenser

c)

Orifice Tube

d)

Accumulator

e)

Blend Door

44.

Match the following

a)

1.

Compressor

b)

2.

Cabin Filter

c)

3.

Blower Motor

d)

4.

Control Panel

e)

5.

Crying Jimmy Kimmel

45.

Match the following

a)

1.

Dryer

b)

2.

Accumulator

c)

3.

1234 Refrigerant

d)

4.

134a

e)

5.

Actuator

46.

Match the following

a)

1.

Schrader

b)

2.

Zerk

c)

3.

Quarter Turn Valve

d)

4.

Line Release Tool

e)

5.

Valve Core Tool

47.

In (a)   , Willis Carrier invented and patented the first electric air conditioner.

48.

Heat transfer can occur through conduction, (a)   , and radiation.

49.

Air doors are controlled by cables, ______, or electric servos.

a)

Linkages

b)

Magnets

c)

Rheostats

d)

Vacuum Servos

e)

Magic

50.

_____ ______ determine the rate of airflow out of the vents.

a)

Blower motors

b)

Electric Servos

c)

Magnetos

d)

Resistors

e)

Jazz Hands

51.

(a)   microns equal 1 inch of vacuum.

52.

_____ _____ refers to a pulsing current flow (duty cycle) that controls a blower motor’s speed. It provides an infinite number of speeds within its design limitations.

a)

Voltage Rectifying

b)

Pulse Width Modulation

c)

Load Bridging

d)

Binary Switching

e)

Alternating Current

53.

In some vehicles, the highest blower motor speed receives ______ from a dedicated fan relay.

a)

Surge Protection

b)

Ground

c)

a Full 12 Volts

d)

a Power Boost

e)

a Rectified Signal

54.

A _______ is a three-wire sensor that signals the position of doors to the A/C ECU.

a)

Rheostat

b)

Potentiometer

c)

Thermistor

d)

Servo

e)

Piezoresistor

55.

Fundamentals of Automotive Technology , Third Edition was written by:

(a)  

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