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

Question 1

Where would a technician encounter freezing temperatures with liquid refrigerant?

Answer 1

When it is released into the atmosphere and it freezes

Question 2

At what temperature does Liquid R-22 boil at?

Answer 2

-41 degrees Fahrenheit

Question 3

Should a technician ever refill a refrigerant throwaway cylinder?

Answer 3

No

Question 4

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

Answer 4

The cylinder becomes a dangerous projectile

Question 5

Why must nitrogen be used with a regulator when charging?

Answer 5

The pressure in the cylinder is too great

Question 6

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

Answer 6

An explosion

Question 7

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

Answer 7

It will cause immediate frostbite

Question 8

What part of the body does electrical shock harm?

Answer 8

Heart

Question 9

What two types of injury are cause by electrical energy?

Answer 9

Shock and burn

Question 10

How can technicians prevent shock?

Answer 10

Using their meter and proper lockout procedures

Question 11

How can technicians prevent paint burning while ordering?

Answer 11

Using a non-combustible shield

Question 12

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

Answer 12

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

Question 13

How can heavy equipment be moved across a roof?

Answer 13

Rollers, Crane or a dolly

Question 14

How can refrigerant from a motor burnout be harmful?

Answer 14

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

Question 15

An example of a pressure vessel is

Answer 15

a cylinder containing refrigerant for a refrigeration system

?

Question 16

A fusible plug is made from

Answer 16

a material with a low melting temperature

Question 17

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?

Answer 17

True

Question 18

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

Answer 18

gloves and goggles

Question 19

oil must never be used around an _______ cylinder?

Answer 19

oxygen

Question 20

before using your voltmeter always

Answer 20

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

Question 21

Properly grounded power tools should be used _______

Answer 21

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.

Question 22

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

Answer 22

Related valves or Schrader ports are open

Question 23

Why must nitrogen be used with a regulator?

Answer 23

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

Question 24

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

Answer 24

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

Question 25

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

Answer 25

B3

Question 26

When a hermetic motor burns, while in use ______________

Answer 26

acids in the oil are produced

Question 27

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

Answer 27

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

Question 28

Electrical shock occurs when

Answer 28

a body becomes apart of an electrical circuit

Question 29

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

Answer 29

all of the above

Question 30

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

Answer 30

safety data sheets (SDS)

Question 31

OSHA is the national law that covers workplace safety.

Answer 31

True

Question 32

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

Answer 32

False

Question 33

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

Answer 33

False

Question 34

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

Answer 34

False

Question 35

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

Answer 35

False

Question 36

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

Answer 36

Class A1

Question 37

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

Answer 37

foreign-language translations

Question 38

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

Answer 38

pull, aim, squeeze, sweep

Question 39

Always use a pressure regulator when working with: a) acetylene b) nitrogen c) oxygen d) All of the above.

Answer 39

all of the above

Question 40

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

Answer 40

1/4

Question 41

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

Answer 41

False

Question 42

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

Answer 42

False

Question 43

You can safely use water to extinguish an electrical fire.

Answer 43

False

Question 44

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

Answer 44

True

Question 45

Respirators require periodic flow testing.

Answer 45

True