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HVAC Semester 1-2 District Review Quiz

Total questions: 77

Worksheet time: 1hrs 29mins

Name
Class
Date
1.

Which organization develops nationally recognized HVAC certifications such as EPA Section 608?

a)

OSHA

b)

ACCA

c)

ESCO

d)

ASHRAE

2.

The primary purpose of safety training in HVACR is to:

a)

Increase job speed

b)

Reduce equipment damage

c)

Prevent personal injury and property damage

d)

Improve customer satisfaction

3.

Which type of fire extinguisher is most appropriate for an electrical fire?

a)

Class A

b)

Class B

c)

Class C

d)

Class D

4.

Why is CPR training important for HVAC technicians?

a)

Required for refrigerant handling

b)

Respond to medical emergencies on job sites

c)

Needed for electrical troubleshooting

5.

What is the FIRST step in a professional HVAC service call?

a)

Replace faulty components

b)

Gather tools

c)

Identify the customer’s complaint

d)

Check refrigerant pressures

6.

The basic refrigeration cycle consists of which four major components?

a)

Compressor, evaporator, condenser, expansion device

b)

Compressor, accumulator, receiver, condenser

c)

Evaporator, blower motor, thermostat, condenser

d)

Compressor, drier, suction line, evaporator

7.

The primary function of the compressor is to:

a)

Absorb heat

b)

Condense refrigerant

c)

Increase refrigerant pressure and temperature

d)

Control refrigerant flow

8.

Which component absorbs heat from the conditioned space?

a)

Condenser

b)

Evaporator

c)

Compressor

d)

Expansion valve

9.

What happens to refrigerant pressure as it passes through the metering device?

(a)  

10.

Which refrigerant safety classification indicates low toxicity and no flame propagation?

a)

A. A1

b)

B. A2L

c)

C. B1

d)

D. B2

11.

Which tool is used to measure system pressures?

a)

Micrometer

b)

Manifold gauge set

c)

Vacuum pump

d)

Leak detector

12.

Which instrument is used to evacuate air and moisture from a refrigeration system?

a)

Recovery machine

b)

Manifold gauges

c)

Vacuum pump

d)

Charging scale

13.

Why must moisture be removed from a refrigeration system?

a)

Reduces compressor speed

b)

Improves airflow

c)

Causes acid and damage

d)

Increases pressure

14.

Which tool is designed to bend copper tubing without kinking?

a)

Pipe wrench

b)

Tubing cutter

c)

Tubing bender

d)

Flaring tool

15.

Soft copper tubing is commonly joined using:

a)

Threading

b)

Welding

c)

Brazing

d)

Compression fittings only

16.

Voltage is best described as:

a)

Flow of electrons

b)

Electrical resistance

c)

Electrical pressure

d)

Electrical power

17.

Which unit measures electrical current?

a)

Volts

b)

Ohms

c)

Watts

d)

Amps

18.

Ohm’s Law states that:

a)

P=VI

b)

V=IR

c)

R=P/V

19.

Which tool measures voltage, current, and resistance?

a)

Clamp meter only

b)

Megohmmeter

c)

Multimeter

d)

Continuity tester

20.

What is the purpose of grounding equipment?

a)

Improve performance

b)

Reduce power use

c)

Safe path for fault current

d)

Increase voltage

21.

Electric motors convert:

a)

Thermal to mechanical

b)

Electrical to mechanical

c)

Chemical to electrical

d)

Mechanical to electrical

22.

Which motor is common in residential HVAC blowers?

a)

DC generator

b)

Universal motor

c)

Single-phase induction motor

d)

Stepper motor

23.

A thermostat functions primarily as a:

a)

Power supply

b)

Control device

c)

Temperature control device

24.

Most important practice before servicing equipment?

a)

Wearing gloves

b)

Lockout/tagout

c)

Insulated tools

d)

Check airflow

25.

Which component rejects heat outdoors?

a)

Evaporator

b)

Compressor

c)

Condenser

d)

Expansion valve

26.

Heat exchangers function by:

a)

Storing refrigerant

b)

Transferring heat

c)

Increasing resistance

d)

Regulating flow

27.

Which compressor type is common in residential AC?

a)

Centrifugal

b)

Screw

c)

Scroll

d)

Diesel reciprocating

28.

Electrical troubleshooting should begin with:

a)

Replace control board

b)

Review wiring diagram

c)

Check refrigerant

d)

Reset thermostat

29.

A blown fuse usually indicates:

a)

Normal operation

b)

Low refrigerant

c)

Electrical fault

d)

Improper airflow

30.

Why is electrical safety critical?

a)

Low voltage systems

b)

Risk of injury or death

c)

Tools are expensive

d)

Rare grounding

31.
A raingauge should be preferably fixed
a)
Near the building
b)
Under the tree
c)
In an open space
d)
In a closed space
32.

       System water supply tank heating systems without a supervised low temperature alarm connected to a constantly attended location shall be inspected ________ during the heating season.

a)

daily

b)

weekly

c)

monthly

d)

quarterly

33.

Label all parts of the Refrigeration cycle.

a)

Evaporator

b)

Compressor

c)

Metering device

d)

Condenser

e)

Discharge line

f)

Liquid line

g)

Expansion line

h)

Suction line

1
2
3
4
5
6
7
8
1)
2)
3)
4)
5)
6)
7)
8)
34.

When working the POS you should wear your gloves.

a)

False

b)

True

35.

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

36.

The system has lost all Refrigerant, But the leak test passed. What should be done next?

a)

Replace Valves

b)

Check Fuses

c)

Vacuum

d)

Charge

e)

Recover

37.

Compressor came on for a few seconds then shut off when the High Side pressure got Too High. What could be a possible cause?

a)

Clog in the Expansion Valve

b)

Bad Expansion Valve stuck in the Closed position

c)

Bad Receiver/Dryer resulting in desiccant pellets clogging the High side line.

d)

All of the Above

e)

None of the Above

38.

HFC:

a)

Hydrofluorocarbon

b)

Hyperflexcompatible

c)

Hexifluidcarbon

d)

Hyrdofreoncompatible

e)

Hypofluidcombustible

39.

The correct name of the Valve Core:

a)

Poppet Valve

b)

Piston Valve

c)

Zerk Valve

d)

Schrader Valve

e)

Stem Fitting

40.

CFC:

a)

Chlorofluidcarbon

b)

Chlorofluorocarbon

c)

CarolinaFriedChicken

d)

Carbonfluorocarbide

41.

What is Frequency?

4 lines
42.

What can form if water or water vapor is left in the system?

a)

hydrocarbon

b)

hydrochloric and hydrofluoric acid

c)

ester-based oil

d)

hydrogen

43.

What happens when a low pressure system exceeds 10 psig and the rupture disk opens?

a)

The system vents refrigerant

b)

The system leaks oil

c)

The moisture in the system is released

d)

Nothing

44.

When pressurizing a low pressure appliance for the purpose of leak detection DO NOT exceed ____.

a)

25 psig

b)

17 psig

c)

10 psig

d)

30 psig

45.

How many splices are allowed in a run of coaxial video surveillance cabling according to industry standard?

a)

Two

b)

Five

c)

Three

d)

Four

46.

What can happen when a low pressure appliance has a leak at a fitting or gasket?

a)

Water can spill from the system

b)

Air and moisture can enter the system

c)

refrigerant can leak from the system

d)

The fitting or gasket can corrode and may need to be replaced

47.

Recovered refrigerant that is contaminated must be recovered into:


a)

A tank with other types of refrigerant in it

b)

The same tank as the refrigerant that isn't contaminated

c)

A separate tank

48.

What are heat stroke symptoms?

4 lines
49.

What problems are you having with your HVAC Unit?

a)

Open-ended

b)

Closed-ended

50.

     Hydrants are required to be flow tested at least (a)   .

51.
The area of a bathroom shall not be less than 
a)
2.0 sq.m
b)
2.5 sq.m
c)
1.5 sq.m
d)
1.0 sq.m
52.

If walkin temperature is 47 F its an extreme violation in OER

a)

True

b)

False

53.

Some toxins are naturally associated with

a)

Chemical Hazards

b)

Certain plants, mushrooms, and seafood.

c)

Physical hazards

d)

HACCP

54.

What is the definition of a Type II appliance?

a)

high pressure appliance containing more than 5 lbs of refrigerant

b)

A high pressure appliance containing less than 5 lbs of refrigerant

c)

A low pressure appliance containing more than 5 lbs of refrigerant

d)

An appliance containing less that 5 lbs of refrigerant

55.

HFC: Stands for Hyper flex compatible

a)

Hydrofluorocarbon

b)

Hyperflexcompatible

c)

Hexifluidcarbon

d)

Hyrdofreoncompatible

e)

Hypofluidcombustible

56.
Question Image

Match the state of refrigerant.

a)

Liquid/high/high

1.

Liquid line

b)

Liquid/low/low

2.

Expansion line

c)

Vapor/high/high

3.

Discharge line

d)

Vapor/low/low

4.

Suction line

57.

Where does Super heat start?

a)

2

b)

4

c)

8

d)

6

58.

Where does desuper heating begin?

a)

5

b)

3

c)

4

d)

6

59.

Where does Sub cooling start?

a)

4

b)

3

c)

6

d)

7

60.

Customer states: AC not blowing cold. Gauges read 450 pressure on Both High and Low Side. What should be done next?

a)

Check condenser coil for restricted airflow

b)

Check Condenser for proper operation

c)

Vacuum and Leak Test

d)

Check pressure switches

e)

Replace Valve Caps

61.

Compressor came on for a few seconds then shut off when the High Side pressure got Too High. What could be a possible cause?

a)

Clog in the Expansion Valve

b)

Bad Expansion Valve stuck in the Closed position

c)

Bad Receiver/Dryer resulting in desiccant pellets clogging the High side line.

d)

All of the Above

e)

None of the Above

62.

The correct name of the Valve Core:

a)

Poppet Valve

b)

Piston Valve

c)

Zerk Valve

d)

Schrader Valve

e)

Stem Fitting

63.

CFC: Stands for Carbon fluoro carbide

a)

Chlorofluidcarbon

b)

Chlorofluorocarbon

c)

CarolinaFriedChicken

d)

Carbonfluorocarbide

64.

A CFC Refrigerant:

a)

R134a

b)

R-12

c)

R1234yf

d)

All of the Above

65.

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

66.

Tech A says: The high side line is larger in diameter than the Low side line. Tech B says: The low side service port is larger than the High side service port. Who is correct?

a)

Tech A

b)

Tech B

c)

Both Tech A and B

d)

Neither A nor B

67.

What is the median annual salary for an HVAC technician?

a)

$51,670

b)

$47,610

c)

$29,460

d)

$27,560

68.

Cooling system is designed to transfer ________. 

a)
energy
b)
cold
c)
sound
d)
heat
69.

What should be done if a purge unit that is operating excessively?

a)

evaluate the refrigerant charge

b)

pressurize the unit and leak test

c)

check voltage to the purge unit

d)

clean the units water tubes

70.

__________ are heat exchanger to transfer heat of coolant to the atmosphere

a)
Fans
b)
Heaters
c)
Radiators
d)
Thermometers
71.

–If an excessive amount of bubbles are dissolved in coolant it becomes aerated and reduces its ability to __________ _____________.

a)
transfer heat
b)
increase pressure
c)
improve efficiency
d)
prevent corrosion
72.

What problems are you having with your HVAC Unit?

a)

Open-ended

b)

Closed-ended

73.

The thermostat that controls the auxiliary electric heat according to the outdoor temperature is called the;

a)

Auxiliary Temperature Control

b)

Outdoor Auxiliary Thermostat

c)

Outdoor Ambient Thermostat

d)

Hold In Thermostat

74.

•Visual Inspection

–A thorough inspection includes checking: _______________ ______________,coolant level, ____________ _______________ leaks, ______________ ___ _____________ .

(Mark all that apply)

a)

coolant condition,

b)

white exhaust

c)

purple smoke

d)

bubbles in coolant

e)

congestion of tubes

75.

At what temperature is an outdoor ambient thermostat normally set?

a)

At 32 degrees Fahrenheit

b)

Slightly above the initial balance point

c)

The same as the indoor thermostat

d)

15 degrees above the initial balance point.

76.

Where does the purge unit take its suction from?

a)

The lowest point of the system

b)

The top of the condenser

c)

The bottom of the condenser

d)

The evaporator charging valve

77.

A high efficiency heat pump system designed to function form high to low ambient conditions below 10 degrees fahrenheit, may have

a)

Two outdoor coils with each one incorporating a dual stage compressor.

b)

Two indoor coils with parallel metering devices.

c)

An auxiliary heat exchanger injected with an ethylene glycol solution.

d)

Two compressors which operate in series.

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