[D2L] Midterm Flashcards
Who manages files and keep records on behalf of apprentices and employers.
AIT
Which department helps settle small issues between apprentices and their employers.
LAC (Local Apprenticeship Committee)
Which class of hazard are substances that cause skin and eye irritation, skin sensitization, dermatitis and chemical burns?
Chemical hazards
Refrigeration Mechanics will most commonly wear steel toed boots marks with the CSA Yellow Triangle
T or F
False (Green Triangle)
Which class of hazard are back injuries, repetitive strain injuries, strained muscles or fatigue?
Ergonomic hazards
What is one PPE that you will be 100% required to wear all all times as a refrigeration mechanic?
Safety boots
What is the definition of an employer?
a person who is self-employed in an occupation
Is your employer allowed to enforce stricter safety rules on their jobsite than OHS requires?
Yes
What is the safe recommended lifting angle for sling legs?
1) 30
2) 45
3) 60
4) Any angle between 30 and 60
60
What is the safety rigging factor for lifting workers?
10:1
Is the 10’ ladder in our class considered a step ladder?
Yes
At which point must a wire rope be replaced?
When surfaces are worn by 1/2 or more of their original diameter
When surfaces are worn by 1/3 or more of their original diameter
When the core is visible
When one strand is broken
When one strand is broken
A 24’ extension ladder used on a 20 foot tall building should be placed how far away from the base of the building?
3.33 feet
4 feet
5 feet
6 feet
5 feet
What color is for ordinary combustibles fire extinguisher?
Green triangle
What are the four steps of proper portable fire extinguisher use?
PASS
Pull the pin
Aim the extinguisher
Squeeze the handle
Sweep the extinguisher from side to side.
Who is responsible for providing workers with WHIMIS training?
The employee must obtain their own training
The union must provide the training
The employer must provide the training
The training institute must provide the training
The employer must provide the training
What is a compound gauge?
Allows reading of positive pressure and vacuum pressure
Phillips #2 Screwdriver is good for which screw sizes?
5-9
How is an open end wrench sized?
Distance across the opening
What is the grove in tube cutters for?
protect the cutters wheel from burrs
It is ok to use nitrogen without waiting, after it has been on its side
T or F
True
which filler material requires the lowest temp?
Soft Solder
Which requires no flux?
Silver Soldering
Which material is better for connecting dissimilar metals in a refrigeration system?
Silver Alloy
What should be done to the acetylene regulator when you are done brazing?
dial it all the way out
dial it all the way in
remove from the B tank
A and C
B and C
A and C
dial it all the way out
remove from the B tank
The formula for calculating the Fitting Allowance is
FA = Throw - Thread Engagement
How is Black Steel / Gas pipe is measured?
Nominal inside diameter
Where is iron pipe typically used?
Ammonia systems
What is brass made of?
Copper and Zinc
What color is type K copper pipe?
Green
What is a hygrometer used to measure?
moisture content
What is the purpose for the yellow hose used with a refrigeration gauge manifold set?
it is used for charging and evacuation refrigeration systems
What is the main disadvantage of copper?
high coefficient of expansion
Which type of copper pipe is annealed?
Soft drawn
How many threads should be left without Teflon tape when adding tape to threads?
all threads should be covered
What should be done to help ensure a good flare?
add oil to the pipe
stop before the tool bottoms out
add oil to the cone of the flaring tool
add oil to the cone of the flaring tool
When crimping wires to spade connectors in class do we use the “non” or “ins” section?
ins
Why should you avoid pulling on the wires and spade after crimping?
it may pull out the wire
it can break individual strands or the wire
the wire insulation can partially slide back
always pull the wires to test it
it can break individual strands or the wire
When making a cord which screw does the black wire go to?
Green
Which fitting has a hub at both ends?
Reducing coupling
What happens if you use too much flux?
it can cause corrosion
Acetylene Hoses are which colour?
Red
Cutting fluid for gas pipe threading is used for
keeping the tool cool
wearing gloves is an example of
engineering controls
administrative controls
PPE use
PPE use
According to OHS you must wear fall protection above
3m (10ft)
the piece you turn on a micrometer to prevent overtightening is the
Thimble
Anvil
Dial
Ratchet
Rachet
What type of copper can not be used as refrigeration copper?
Type M (plumbing)
What does ACR mean if it is stamped on copper pipe?
Air Conditioning and Refrigeration
You measure a piece of copper to bend, make a mark at 4” and put it in the mechanical benders. The end you measured from sticks out the right side. What point should line up with the Zero on the wheel?
90 or R??? (not sure)
What is another name for a vacuum gauge?
Micron gauge
Why did we pull down the system to 500 microns then turn off the vacuum pump and watch the microns on the gauge for a minute before adding to the system?
To tell if we pulled it into a deep enough vacuum
To prove the system doesn’t have a large leak
To test the vacuum pump check valve
To allow the deep vacuum to settle out
To prove the system doesn’t have a large leak
Before we remove gauges from a service valve we put it in which position?
Back seat
Front seat
Mid seat
Gauge seat
Back seat
