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7th 6 Months > Tpc 432 > Flashcards

Tpc 432 Flashcards

1
Q

As you increase the pressure in the container you also increase the boiling temperature also know as…

A

Saturation temperature

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2
Q

What is Enthalpy of saturated vapor?

A

It is the sum of Enthalpy of saturated liquid and the Enthalpy of evaporation

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3
Q

Compressor Horsepower formula

A

Heat flow rate = 432 ( 1/42.4 )

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4
Q

When a suction line heat exchanger is used to subcool the refrigerant liquid, where is the cold vapor pulled from?

A

It is from the evaporator

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5
Q

Condensate sub cooling happens between the receiver and the…

A

Expansion valve

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6
Q

The ideal refrigerate should not be…

A

Flammable

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7
Q

What is the purpose of classifying refrigerants with CFC, HCFC, and HFC?

A

Its groups refrigerants based on their chemical structure

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8
Q

What is an important term related to refrigerant blends?

A

Temperature glide

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9
Q

Refrigerant safety ratings go from A1 ( safest ) to…

A

B3 ( least safe )

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10
Q

What is something you must never do while working around/with refrigerant?

A

Never apply an open flame

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11
Q

What does the Ozone do?

A

It forms a protective shield that absorbs damaging ultraviolet radiation from the sun

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12
Q

Why are CFC’s Chlorofluorocarbons dangerous?

A

They absorb infrared radiation in the same way that carbon dioxide and methane do

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13
Q

Recycling involves the use of portable equipment, on site in order to…

A

Recover and clean refrigerant

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14
Q

Recycled refrigerant must be used on what system?

A

The same system that the refrigerant was pulled from originally

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15
Q

What is a method to reduce vibrations in the refrigeration system?

A

Mufflers installed in the discharge lines near the compressor will help to dissipate vibrations

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16
Q

All refrigeration and air conditioning service technicians must be certified to what class?

A

Class 1 and class 2 and it is a epa written exam

17
Q

One of the main and final rules that the EPA enforces on the recycling and disposal of refrigeration is…

A

Reclaimer certification programs

18
Q

What is active vs passive refrigerant recovery system?

A

Active has a self contained compressor, and passive utilizes upon the compressor of the refrigerant equipment

19
Q

What certification is required for a technician to work on residential air conditioning?

A

Type II technician certification, ( high or very high pressure systems )

20
Q

Does the EPA require equipment certification programs to maintain records?

A

Yes

21
Q

What can filter-driers remove in refrigerant excluding moisture?

A

Filter-driers can also remove and neutralize acids in the system

22
Q

What is the difference between absorption-type desiccant and adsorption-type desiccant?

A

Absorption- removes moisture by chemical action
Adsorption- removes moisture mechanically

23
Q

If you place a filter-drier in a vertical position, where should the inlet be?

A

The inlet should be at the top and the outlet at the bottom so the refrigerant oil can not be trapped in the drier

24
Q

What is a critical part when selecting filter driers?

A

Filtration capabilities, smallest particle it will filter and how often it needs replacing

25
Q

What precautions should you observe when working with filter-driers?

A

Always wear safety goggles and gloves when working with refrigerants

26
Q

What can you use to pressurize a system
To check for leaks before adding refrigerants?

A

Pressure the system with nitrogen and run a soapy solution over the suspected leak points

27
Q

When installing gauges where do you install the high side line from the gauge manifold?

A

To the discharge service valve

28
Q

What is a visual indication of there being low refrigerant levels in the system?

A

Vapor bubbles in the sight glass

29
Q

How do you check to see if there is moisture in the system?

A

When the pressure in the system drops to 1000 microns, close the pump valve and stop the pump. If the vacuum gauge shows a rise in pressure there is moisture in the system

30
Q

What is the best method for adding a complete charge to a system?

A

The weight method

31
Q

What is miscibility?

A

Miscibility describes the ability of substances to mix, the miscibility of the oil and refrigerant is important at all temperatures

32
Q

What problems can occur when oil mixes with refrigerant?

A

Clogging of desiccants

33
Q

Where is an oil separator installed at?

A

This device is installed in the discharge line between the compressor and the condenser?

34
Q

What problems can occur at low temperatures with moisture in a refrigerant system?

A

Moisture can freeze and block the flow of refrigerant

35
Q

Should the compressor be running when you check the oil level in a refrigerant system?

A

No, it should be idle for at least ten minutes before you check the oil level

7th 6 Months (7 decks)

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