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Refrigeration > Test Study > Flashcards

Test Study Flashcards

1
Q

Name three types of metering devices.

A
  1. Capillary tube
  2. Thermostatic expansion valve
  3. Automatic expansion valve
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2
Q

If the contamination from a burned out compressor reaches the new compressor, the new compressor
will probably:

A

Burn out

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3
Q

What are the three main functions of a TXV:

A

a. Provide a constant amount of evaporator superheat
b. Keep the entire evaporator full of regrigerant
c. Prevent floodback of refrigerant to the compressor
d. ALL OF THE ABOVE

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4
Q

Air can enter a refigeration system in what three ways:

A

A. through leaks
b. poor charging procedures
C. poor recovery procedures

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5
Q

What will be the effect on a refrigeration system if too small a diameter of tubing is used for the capillary control?

A

The evaporator will starve

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6
Q

Oil removed from a system should be handled carefully because?

A

It can cause skin burns

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7
Q

Name two devices used to detect refrigerant leaks in a system.

A

a. Ultraviolet detection
b. Halide torch leak
c. Electronic leak detector

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8
Q

Can a refrigerant be reused after a burnout?

A

No

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9
Q

Why is it necessary to have superheat in a refrigeration system?

A

To ensure refrigerant is in a vapor state

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10
Q

What does the term TEWI mean:

A

Total Equivelant Warming Impact

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11
Q

What does the term CAA stand for:

A

Clean air act

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12
Q

How many classes is the CAA divided into:

A

2

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13
Q

Section 608 of the CAA prohibits individuals from knowingly doing what.

A

Knowingly venting off refrigerants into the atmosphere

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14
Q

The EPA has established a mandatory technician certification program, which has how many tipes or certifications?

A

4

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15
Q

According to the EPA equipment used for the recovery and recycling of refrigerant must be equipment with what:

A

Low-loss fittings

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16
Q

Name the four stages of refrigeration cycle:

A
  1. Expansion
  2. Evaporation
  3. Compression
  4. Condensation
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17
Q

The heat energy that causes a liquid refrigerant to change to a vapor at a constant saturation temperature for a given pressure, is called :

A

Latent heat

18
Q

_________Is the pressure at which the refrigerant changes state from a vapor to a liquid.

A

Condensing pressure

19
Q

__________ is the pressure at which the refrigerant changes state from a liquid to a vapor.

A

Evaporating pressure

20
Q

The _________ function is to circulate refrigerant.

A

Compressor’s

21
Q

What is the function of the discharge line?

A

To carry high pressure superheated vapor from the compressor discharge valve to the entarce of the condenser

22
Q

What does the receiver do in a refrigeration system?

A

Acts as a surge tank

23
Q

What does the liquid line do in the refrigeration system?

A

Transports high pressure subcooled liquid to the metering device

24
Q

The metering device is a restriction that separates the high pressure side from the________ side in a refrigeration system.

A

Low side

25
Q

The metering device meters liquid refrigerant from the liquid line to the.

A

Evaporator

26
Q

Superheat on the systems low side can be divided into two types, what are they?

A

Evaporator superheat, total compressor superheat

27
Q

What does the TXV control?

A

Evaporator superheat

28
Q

Name four situations that can cause low evaporator loads.

A
  1. Evaporator fan motor not operating
  2. Iced up or dirty coil
  3. Defrost circuit malfunction causing coil icing
  4. End of the refrigeration cycle
  5. Low air flow across evaporator coil
  6. Low refrigerant charge
29
Q

Flooding is when liquid refrigerant enters the compressor while the compressor is running? T/F

A

True

30
Q

Name two reasons why slugeine might occurina refrigeration system.

A
  1. Bad TXV
  2. Low load
  3. Dirty evaporator
  4. overcharge
31
Q

Subcooling always refers to a liquid at a temperature __________ its saturation temperature for a given pressure.

A

Below

32
Q

The evaporator, like the condenser, acts as a

A

Heat exchanger

33
Q

The suction line transports low pressure superheated vapor from the evaporator to the

A

Compressor

34
Q

If a capillary tube system is overcharged, it will back up the excess liquid in the condenser, causing high head pressures. T/F

A

True

35
Q

Why is it important to install a filter drier before the capillary tube?

A

Catch foreign objects

36
Q

What is the color code for R-11 refrigerant?

A

Orange

37
Q

What is the color code for R-12 refrigerant?

A

Yellow

38
Q

What is the color code for R-134a refrigerant?

A

Blue

39
Q

Air and _________ are detrimental to a refrigeration system.

A

Moisture

40
Q

New and replacement compressors are shipped with a dry nitrogen charge that must be remotes and then________before using.

A

Evacuated

Refrigeration (1 decks)

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