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Refrigeration Theory [Finalized!] > [ILM] 102I > Flashcards

[ILM] 102I Flashcards

1
Q

R-717 is

A

ammonia

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2
Q

R-744 is

A

carbon dioxide

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3
Q

R-764 is

A

sulphur dioxide

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4
Q

R-40 is

A

methyl chloride

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5
Q

R-290 is

A

propane

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6
Q

Azeotropes
Zeotropes

A

1 mixture
2+ mixtures

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7
Q

Chlorofluorocarbon (CFC)

A

contains chlorine and fluorine

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8
Q

Hydrochlorofluorocarbon (HCFC)

A

contains chlorin, fluorine and hydrogen

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9
Q

Hydrofluorocarbon (HFC)

A

contains fluorine and hydrogen

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10
Q

Zeotropic refrigerants are in the

A

400 series

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11
Q

Azeotropic refrigerants are in the

A

500 series

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12
Q

CFC refrigerants depletes the earth’s ozone layer, they are banned from use in new systems or in recharging old refrigerant systems

T or F

A

True

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13
Q

as of 2020, _____ cannot be used in recharging old refrigerant systems

A

HCFC refrigerants

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14
Q

Halocarbon refrigerants are non-flammable, but break down chemically in a flame

T or F

A

True

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15
Q

The Montreal Protocol, established in

A

1987, and provided phase-out schedules for ozone-depleting substances

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16
Q

Refrigeration oils

A

they use synthetic oils now and they are called polyolester oils

more expensive than mineral oils

17
Q

polyolester oil

A

highly hygroscopic, it has a significantly strong attraction for water

should not remain exposed to the atmosphere for more than 5 minutes

18
Q

Low toxicity (Class A)

A

is equal to and above 400 parts per million (ppm)

19
Q

High toxicity (Class B)

A

is equal to and below 399 part per million (ppm)

20
Q

Cylinder Type

R-134a
R-22
R-404A
R-410A
R-507
R-717 (ammonia)

A

Colour Code

Light sky blue
Light green
Orange
Rose
Blue green (teal)
Silver

21
Q

Refrigerant recovery cylinders have a

A

yellow top and gray body

cannot exceed 300lb

22
Q

Cylinders for flammable refrigerants have a red band on the top

T or F

A

True

23
Q

always transport and store cylinders in an upright & secure mode

A

True

24
Q

Never exceed the liquid water weight capacity by more than

A

80% at 70F
or
60% at 125F (max limit)

25
Q

the temperature inside service trucks can exceed 125F on summer days

A

True

26
Q

liquid recovery

A

The quickest method of recovery and it does not remove the vaporous refrigerant. Vapour removal method is necessary after the liquid removal

27
Q

vapour recovery

A

the slowest method of recovery

28
Q

A refrigeration system should contain at least 20lb of refrigerant for the push-pull recovery method to work effectively

A

True

29
Q

you must report leaks that exceed _____ to the Alberta Environment

A

10kg (22lb)

30
Q

Always replace the vacuum pump’s oil

A

prior to each evacuation

31
Q

connecting the vacuum pump to both the high and low sides of a system reduces the evacuation time

A

True

32
Q

There are _____ microns in an inch

A

760,000

Refrigeration Theory [Finalized!] (20 decks)

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