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Term 1: Charging, Evac & Measuring > Modern Chapter 10 - Quiz > Flashcards

Modern Chapter 10 - Quiz Flashcards

1
Q

Refrigerant ____ is the process of removing refrigerant from a system and storing it in a cylinder.

recovery

reclaiming

restoring

recycling

A

recovery

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2
Q

Which type of refrigerant cylinder is gray on the bottom and yellow on the top?

Service.

Storage.

Recovery.

Disposable.

A

recovery

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3
Q

A Bourdon tube ____ as pressure inside it increases.

closes

straightens

opens

bends

A

straightens

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4
Q

If the valve stem is turned counterclockwise as far as possible, the service valve is in the ____ position.

back seated

front seated

cracked open

None of the above.

A

backseated

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5
Q

What percentage of moisture and particulates must be removed from reclaimed refrigerants?

50%

75%

90%

100%

A

100%

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6
Q

Vacuum pump oil turns ____ when it is contaminated by water.

green and pale

white and foamy

brown and thick

black and runny

A

white and foamy

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7
Q

Halogens cause the torch of a flame to turn ____ when they are brought into contact with heated copper.

green

red

blue

white

A

green

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8
Q

Which type of gauge is designed to read pressure values on a single continuous scale and be used on the high side of a system?

Compound gauge.

Vacuum gauge.

Low-side gauge.

High-pressure gauge.

A

high-pressure gauge

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9
Q

A gauge should not be exposed to pressure greater than ____ of its full-scale range for more than a few minutes.

40%

50%

60%

75%

A

75%

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10
Q

Drawing an extremely low pressure in a refrigeration system is necessary to remove ____ from the system.

leaks

moisture

light

heat

A

moisture

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11
Q

A suction service valve connects to the suction line and directly onto the ____.

accumulator outlet

compressor at its inlet

liquid receiver outlet

suction-line filter-drier

A

compressor at its inlet

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12
Q

All refrigerant cylinders should be secured with ____ when they are being transported.

a chain

tightly packed bubble wrap

corrugated cardboard sheets

large sacks of flour

A

a chain

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13
Q

When using a digital charging scale, a technician must know the ____ weight of a cylinder, which is its weight when it is empty.

tare

valve

seat

empty

A

tare

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14
Q

Each time a recovery/recycling machine is used, the filter-drier should be changed.

True
False
A

true

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15
Q

Electronic leak detectors can only be used to detect CFCs.

True
False
A

false

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16
Q

Disposable cylinders are designed to be used for refrigerant recovery.

True
False
A

false

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17
Q

Refrigerant must be recovered from a leaking system before repairs can be performed.

True
False
A

true

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18
Q

Refrigerant is reclaimed on the job site.

True
False
A

false

19
Q

A gauge that reads absolute pressure should be adjusted depending on the elevation.

True
False
A

false

20
Q

The pressure of a perfect vacuum is 29.92 in. Hg.

True
False
A

true

21
Q

Both valves need to be closed on a gauge manifold in order to evacuate a system.

True
False
A

false

22
Q

Recovery cylinders are often equipped with two valves: one for vapor and one for liquid.

True
False
A

true

23
Q

A decrease in temperature can cause the pressure in a cylinder to increase.

True
False
A

false

24
Q

Service valves are front seated for normal system operation.

True
False
A

False

25
Q

The compound gauge measures pressure both above and below atmospheric pressure.

True
False
A

True

26
Q

Background noise can sometimes produce a false alarm in an electronic leak detector.

True
False
A

false

27
Q

Fluorescent leak detectors require the use of a halogen light.

True
False
A

false

28
Q

The most common method used to gain access to small hermetic systems or those without access ports is using a piercing valve.

True
False
A

True

29
Q

What is the highest possible vacuum that a vacuum pump can pull called?

A

Ultimate vacuum

30
Q

What is made of a metal with a low melting point?

A

fusible plug

31
Q

A single instrument that can measure multiple variables and provide some troubleshooting capabilities

A

refrigeration system analyzer

32
Q

What is charged into a system to detect leaks?

A

refrigerant dye

33
Q

The speed at which gas may be pumped through a vacuum pump?

A

free air displacement

34
Q

Used to remove moisture by evacuating a system?

A

vacuum pump

35
Q

Used to read pressure above and below atmospheric pressure

A

compound gauge

36
Q

Consists of both a compound gauge and a high pressure gauge

A

gauge manifold

37
Q

Should be removed from an access port to evacuate a system

A

valve core

38
Q

Valve located at the inlet to the liquid line

A

liquid receiver service valve

39
Q

Why is it dangerous to fill a refrigerant cylinder beyond its recommended capacity?

A

when temp rises the press rises and risks explosion

40
Q

Explain the purpose of the center port in between the high and low sides of a gauge manifold?

A

the hose you connect to a ref cylinder, recovery machine, or vacuum pump

41
Q

List the advantages and disadvantages of using bubble solutions to check for leaks?

A

low cost and easy although large leaks may not register

42
Q

How are oil contaminants in refrigerant reduced by recovery machines?

A

processes refrigerant through filter-driers and uses distillation to separate oil from ref

43
Q

What is the difference between a service port and an access port?

A

An access port does not have a service valve

Term 1: Charging, Evac & Measuring (6 decks)

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