[D2L] Midterm

Question 1

Who manages files and keep records on behalf of apprentices and employers.

Answer 1

AIT

Question 2

Which department helps settle small issues between apprentices and their employers.

Answer 2

LAC (Local Apprenticeship Committee)

Question 3

Which class of hazard are substances that cause skin and eye irritation, skin sensitization, dermatitis and chemical burns?

Answer 3

Chemical hazards

Question 4

Refrigeration Mechanics will most commonly wear steel toed boots marks with the CSA Yellow Triangle

T or F

Answer 4

False (Green Triangle)

Question 5

Which class of hazard are back injuries, repetitive strain injuries, strained muscles or fatigue?

Answer 5

Ergonomic hazards

Question 6

What is one PPE that you will be 100% required to wear all all times as a refrigeration mechanic?

Answer 6

Safety boots

Question 7

What is the definition of an employer?

Answer 7

a person who is self-employed in an occupation

Question 8

Is your employer allowed to enforce stricter safety rules on their jobsite than OHS requires?

Answer 8

Yes

Question 9

What is the safe recommended lifting angle for sling legs?

1) 30
2) 45
3) 60
4) Any angle between 30 and 60

Answer 9

60

Question 10

What is the safety rigging factor for lifting workers?

Answer 10

10:1

Question 11

Is the 10’ ladder in our class considered a step ladder?

Answer 11

Yes

Question 12

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

Answer 12

When one strand is broken

Question 13

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

Answer 13

5 feet

Question 14

What color is for ordinary combustibles fire extinguisher?

Answer 14

Green triangle

Question 15

What are the four steps of proper portable fire extinguisher use?

Answer 15

PASS

Pull the pin
Aim the extinguisher
Squeeze the handle
Sweep the extinguisher from side to side.

Question 16

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

Answer 16

The employer must provide the training

Question 17

What is a compound gauge?

Answer 17

Allows reading of positive pressure and vacuum pressure

Question 18

Phillips #2 Screwdriver is good for which screw sizes?

Answer 18

5-9

Question 19

How is an open end wrench sized?

Answer 19

Distance across the opening

Question 20

What is the grove in tube cutters for?

Answer 20

protect the cutters wheel from burrs

Question 21

It is ok to use nitrogen without waiting, after it has been on its side

T or F

Answer 21

True

Question 22

which filler material requires the lowest temp?

Answer 22

Soft Solder

Question 23

Which requires no flux?

Answer 23

Silver Soldering

Question 24

Which material is better for connecting dissimilar metals in a refrigeration system?

Answer 24

Silver Alloy

Question 25

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

Answer 25

A and C dial it all the way out remove from the B tank

Question 26

The formula for calculating the Fitting Allowance is

Answer 26

FA = Throw - Thread Engagement

Question 27

How is Black Steel / Gas pipe is measured?

Answer 27

Nominal inside diameter

Question 28

Where is iron pipe typically used?

Answer 28

Ammonia systems

Question 29

What is brass made of?

Answer 29

Copper and Zinc

Question 30

What color is type K copper pipe?

Answer 30

Green

Question 31

What is a hygrometer used to measure?

Answer 31

moisture content

Question 32

What is the purpose for the yellow hose used with a refrigeration gauge manifold set?

Answer 32

it is used for charging and evacuation refrigeration systems

Question 33

What is the main disadvantage of copper?

Answer 33

high coefficient of expansion

Question 34

Which type of copper pipe is annealed?

Answer 34

Soft drawn

Question 35

How many threads should be left without Teflon tape when adding tape to threads?

Answer 35

all threads should be covered

Question 36

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

Answer 36

add oil to the cone of the flaring tool

Question 37

When crimping wires to spade connectors in class do we use the "non" or "ins" section?

Answer 37

ins

Question 38

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

Answer 38

it can break individual strands or the wire

Question 39

When making a cord which screw does the black wire go to?

Answer 39

Green

Question 40

Which fitting has a hub at both ends?

Answer 40

Reducing coupling

Question 41

What happens if you use too much flux?

Answer 41

it can cause corrosion

Question 42

Acetylene Hoses are which colour?

Answer 42

Red

Question 43

Cutting fluid for gas pipe threading is used for

Answer 43

keeping the tool cool

Question 44

wearing gloves is an example of engineering controls administrative controls PPE use

Answer 44

PPE use

Question 45

According to OHS you must wear fall protection above

Answer 45

3m (10ft)

Question 46

the piece you turn on a micrometer to prevent overtightening is the Thimble Anvil Dial Ratchet

Answer 46

Rachet

Question 47

What type of copper can not be used as refrigeration copper?

Answer 47

Type M (plumbing)

Question 47

What does ACR mean if it is stamped on copper pipe?

Answer 47

Air Conditioning and Refrigeration

Question 48

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?

Answer 48

90 or R??? (not sure)

Question 49

What is another name for a vacuum gauge?

Answer 49

Micron gauge

Question 50

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

Answer 50

To prove the system doesn't have a large leak

Question 51

Before we remove gauges from a service valve we put it in which position? Back seat Front seat Mid seat Gauge seat

Answer 51

Back seat