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HVAC Safety Exam > Preread quiz, Pretest quiz, Unit 4 General safety questions, > Flashcards

Preread quiz, Pretest quiz, Unit 4 General safety questions, Flashcards

1
Q

Where would a technician encounter freezing temperatures with liquid refrigerant?

A

When it is released into the atmosphere and it freezes

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2
Q

At what temperature does Liquid R-22 boil at?

A

-41 degrees Fahrenheit

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3
Q

Should a technician ever refill a refrigerant throwaway cylinder?

A

No

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4
Q

What happens to an oxygen or nitrogen cylinder if the valve is broken off?

A

The cylinder becomes a dangerous projectile

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5
Q

Why must nitrogen be used with a regulator when charging?

A

The pressure in the cylinder is too great

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6
Q

What can happen when oil is mixed with oxygen under pressure?

A

An explosion

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7
Q

Why should technicians not use their hands to stop liquid refrigerant from escaping?

A

It will cause immediate frostbite

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8
Q

What part of the body does electrical shock harm?

A

Heart

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9
Q

What two types of injury are cause by electrical energy?

A

Shock and burn

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10
Q

How can technicians prevent shock?

A

Using their meter and proper lockout procedures

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11
Q

How can technicians prevent paint burning while ordering?

A

Using a non-combustible shield

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12
Q

What safety precaution should be taken before starting a large motor with the coupling disconnected?

A

Place all tools away from the coupling or pulley and stand aside

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13
Q

What is the third wire used for on a portable electric drill?

A

Ground wire

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14
Q

How can heavy equipment be moved across a roof?

A

Rollers, Crane or a dolly

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15
Q

What special precautions should be taken before using chemicals to clean an air-cooled condenser?

A

Read the entire label and follow the manufacturers directions.

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16
Q

How can refrigerant from a motor burnout be harmful?

A

the refrigerant becomes contaminated with the oil and becomes acidic which is hazardous to skin.

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17
Q

An example of a pressure vessel is

A

a cylinder containing refrigerant for a refrigeration system

?

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18
Q

A fusible plug is made from

A

a material with a low melting temperature

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19
Q

T or F? It is possible that your hand will suffer frostbite if it comes in contact with liquid R-22 when accidentally released into the atmosphere?

A

True

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20
Q

When transferring refrigerant from a cylinder to a refrigeration system, you should always wear:

A

gloves and goggles

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21
Q

oil must never be used around an _______ cylinder?

A

oxygen

22
Q

before using your voltmeter always

A

set the range selector to a voltage higher than the one you will be reading.

23
Q

Properly grounded power tools should be used _______

A

so that if the motor or other electrical part of the tool becomes shorted to the frame, the electrical current will follow the grounding circuit.

24
Q

A double-insulated electric drill

A

generally has a plastic case with the electrical connections and motor insulated within the tool.

25
Q

When soldering a replacement fitting in a refrigeration circuit, it is important that

A

Related valves or Schrader ports are open

26
Q

Why must nitrogen be used with a regulator?

A

To reduce the very high pressure in the cylinder to a safer one

27
Q

What letters do A,B,C mean on a fire extinguisher?

A

A - Trash, Paper, and wood fires
B - Burning liquids
C - Electrical equipment fires

28
Q

What refrigerant safety group classification has the highest flammability and the highest toxicity?

A

B3

29
Q

When a hermetic motor burns, while in use ______________

A

acids in the oil are produced

30
Q

Why must nitrogen be used only with a regulator when it is charged into a system?

A

The pressure in the cylinder is too great, and if connected to a system unregulated, a weak point in the system could burst.

31
Q

Electrical shock occurs when

A

a body becomes apart of an electrical circuit

32
Q

Before operating a power tool:

a) check the condition of the tool
b) ensure the extension is the correct size
c) put on the appropriate PPE
d) all of the above

A

all of the above

33
Q

OSHA’s Hazard Communication Standard (HCS) requires manufacturers and distributors to provide ____ for the chemicals they supply.

A

safety data sheets (SDS)

34
Q

OSHA is the national law that covers workplace safety.

A

True

35
Q

Keys used for electrical lockout must be kept near the lockout device so any worker can unlock the device in an emergency.

A

False

36
Q

In an emergency situation, any type of fire extinguisher can be used on any type of fire.

A

False

37
Q

A hard hat can be worn with the bill facing forward or backward.

A

False

38
Q

Facial hair can make a dust mask or respirator ineffective due to poor sealing.

A

True

39
Q

A ladder can be placed on a scaffold as long as the scaffold wheels are locked.

A

False

40
Q

Working in hot temperatures can cause your body to overheat.

A

True

41
Q

Based on ASHRAE Standard 34, which refrigerant classification would indicate least toxicity?

A

Class A1

42
Q

The Globally Harmonized System (GHS) includes the following standard label elements except ____.

A

foreign-language translations

43
Q

When referring to the correct usage of a fire extinguisher, the letters P.A.S.S. stand for ____.

A

pull, aim, squeeze, sweep

44
Q

Always use a pressure regulator when working with:

a) acetylene
b) nitrogen
c) oxygen
d) All of the above.

A

all of the above

45
Q

When positioning an extension ladder, the base can be no farther from the wall than ____ the supported height.

A

1/4

46
Q

Tagout is the practice of securing an electrical switch in an open position so a circuit cannot be energized while work is being performed.

A

False

47
Q

A stationary refrigerant detector indicates when refrigerant is moving too slowly in a system.

A

False

48
Q

You can safely use water to extinguish an electrical fire.

A

False

49
Q

Asbestos insulation, which may be found in old installations, contains fibers that can cause cancer if inhaled.

A

True

50
Q

Respirators require periodic flow testing.

A

True

HVAC Safety Exam (3 decks)

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