Flashcards in Preread quiz, Pretest quiz, Unit 4 General safety questions, Deck (50)
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?
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?
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?
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
What is the third wire used for on a portable electric drill?
How can heavy equipment be moved across a roof?
Rollers, Crane or a dolly
What special precautions should be taken before using chemicals to clean an air-cooled condenser?
Read the entire label and follow the manufacturers directions.
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?
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?
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.
A double-insulated electric drill
generally has a plastic case with the electrical connections and motor insulated within the tool.
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?
When a hermetic motor burns, while in use ______________
acids in the oil are produced