Preread quiz, Pretest quiz, Unit 4 General safety questions, Flashcards
Where would a technician encounter freezing temperatures with liquid refrigerant?
When it is released into the atmosphere and it freezes
At what temperature does Liquid R-22 boil at?
-41 degrees Fahrenheit
Should a technician ever refill a refrigerant throwaway cylinder?
No
What happens to an oxygen or nitrogen cylinder if the valve is broken off?
The cylinder becomes a dangerous projectile
Why must nitrogen be used with a regulator when charging?
The pressure in the cylinder is too great
What can happen when oil is mixed with oxygen under pressure?
An explosion
Why should technicians not use their hands to stop liquid refrigerant from escaping?
It will cause immediate frostbite
What part of the body does electrical shock harm?
Heart
What two types of injury are cause by electrical energy?
Shock and burn
How can technicians prevent shock?
Using their meter and proper lockout procedures
How can technicians prevent paint burning while ordering?
Using a non-combustible shield
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
How can heavy equipment be moved across a roof?
Rollers, Crane or a dolly
How can refrigerant from a motor burnout be harmful?
the refrigerant becomes contaminated with the oil and becomes acidic which is hazardous to skin.
An example of a pressure vessel is
a cylinder containing refrigerant for a refrigeration system
?
A fusible plug is made from
a material with a low melting temperature
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
When transferring refrigerant from a cylinder to a refrigeration system, you should always wear:
gloves and goggles
oil must never be used around an _______ cylinder?
oxygen
before using your voltmeter always
set the range selector to a voltage higher than the one you will be reading.
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.
When soldering a replacement fitting in a refrigeration circuit, it is important that
Related valves or Schrader ports are open
Why must nitrogen be used with a regulator?
To reduce the very high pressure in the cylinder to a safer one
What letters do A,B,C mean on a fire extinguisher?
A - Trash, Paper, and wood fires
B - Burning liquids
C - Electrical equipment fires
What refrigerant safety group classification has the highest flammability and the highest toxicity?
B3
When a hermetic motor burns, while in use ______________
acids in the oil are produced
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.
Electrical shock occurs when
a body becomes apart of an electrical circuit
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
all of the above
OSHA’s Hazard Communication Standard (HCS) requires manufacturers and distributors to provide ____ for the chemicals they supply.
safety data sheets (SDS)
OSHA is the national law that covers workplace safety.
True
Keys used for electrical lockout must be kept near the lockout device so any worker can unlock the device in an emergency.
False
In an emergency situation, any type of fire extinguisher can be used on any type of fire.
False
A hard hat can be worn with the bill facing forward or backward.
False
A ladder can be placed on a scaffold as long as the scaffold wheels are locked.
False
Based on ASHRAE Standard 34, which refrigerant classification would indicate least toxicity?
Class A1
The Globally Harmonized System (GHS) includes the following standard label elements except ____.
foreign-language translations
When referring to the correct usage of a fire extinguisher, the letters P.A.S.S. stand for ____.
pull, aim, squeeze, sweep
Always use a pressure regulator when working with:
a) acetylene
b) nitrogen
c) oxygen
d) All of the above.
all of the above
When positioning an extension ladder, the base can be no farther from the wall than ____ the supported height.
1/4
Tagout is the practice of securing an electrical switch in an open position so a circuit cannot be energized while work is being performed.
False
A stationary refrigerant detector indicates when refrigerant is moving too slowly in a system.
False
You can safely use water to extinguish an electrical fire.
False
Asbestos insulation, which may be found in old installations, contains fibers that can cause cancer if inhaled.
True
Respirators require periodic flow testing.
True
