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

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

Flashcards in Preread quiz, Pretest quiz, Unit 4 General safety questions, Deck (50)
Loading flashcards...
1

Where would a technician encounter freezing temperatures with liquid refrigerant?

When it is released into the atmosphere and it freezes

2

At what temperature does Liquid R-22 boil at?

-41 degrees Fahrenheit

3

Should a technician ever refill a refrigerant throwaway cylinder?

No

4

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

The cylinder becomes a dangerous projectile

5

Why must nitrogen be used with a regulator when charging?

The pressure in the cylinder is too great

6

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

An explosion

7

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

It will cause immediate frostbite

8

What part of the body does electrical shock harm?

Heart

9

What two types of injury are cause by electrical energy?

Shock and burn

10

How can technicians prevent shock?

Using their meter and proper lockout procedures

11

How can technicians prevent paint burning while ordering?

Using a non-combustible shield

12

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

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

13

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

Ground wire

14

How can heavy equipment be moved across a roof?

Rollers, Crane or a dolly

15

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

Read the entire label and follow the manufacturers directions.

16

How can refrigerant from a motor burnout be harmful?

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

17

An example of a pressure vessel is

a cylinder containing refrigerant for a refrigeration system
?

18

A fusible plug is made from

a material with a low melting temperature

19

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?

True

20

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

gloves and goggles

21

oil must never be used around an _______ cylinder?

oxygen

22

before using your voltmeter always

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

23

Properly grounded power tools should be used _______

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

A double-insulated electric drill

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

25

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

Related valves or Schrader ports are open

26

Why must nitrogen be used with a regulator?

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

27

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

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

28

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

B3

29

When a hermetic motor burns, while in use ______________

acids in the oil are produced

30

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

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