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Prepare and connect refrigerant tubing and fittings > refridgeration > Flashcards

refridgeration Flashcards

1
Q

What is Cupro nickel?

A

An alloy containing 75% copper and 25% nickel

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2
Q

What is a non ferrous meatl?

A

Is which does not contain iron.

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3
Q

What is a ferrous metal?

A

Contains Iron

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4
Q

What does ammonia have a affinity for?

A

water

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5
Q

What is Electrolysis?

A

A reaction causing separation of elements from metals such as ores. contact with salt water.

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6
Q

what are the properties of cupro nickel when in contact with salt water?

A

Has a neutral electrode potential to salt water and has a high resistance to saltwater corrosion.

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7
Q

What is bronze highly resistant to?

A

salt water corrosion

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8
Q

What does Annealed copper mean?

A

To adding heat to restore its malleability.

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9
Q

What is the melting point of silver solder?

A

600 - 900 degrees

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10
Q

What is the temp of the oxy flame?

A

3200

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11
Q

What are silver brazing alloys composed of?

A

Phosphorous, tin and silver

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12
Q

Brown tip%?
blue tip%?
Yellow tip%?

A

brown = 15
blue= 45
yellow = 2

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13
Q

What is b lue tip for?

A

to weld 2 dissimilar metals such as copper to steel

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14
Q

What are dissimilar metals?

A

2 metals the contact in a corrosive invironment and when wetted with water accelerates the Corrosion rate.

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15
Q

What is a flash back arrestor?

A

TO prevent flame receding back through the torch then into the bottle.

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16
Q

What does oxidizing mean?
what does carburizing mean?
what does neutral mean?

A

Excessive oxygen
Excessive acetylene
Perfect mix

17
Q

What code of practice is purging under?

A

As/Nz c.o.p 2007

18
Q

Where are service valves located on the system?

A

Comp, receivers, inline piping.

19
Q

Front seat the service valve?

A

no refrigerant flow through valve. only to component.

20
Q

Back seat the service valve?

A

No Refrigerant flow to service valve. full flow through valve.

21
Q
A

Prepare and connect refrigerant tubing and fittings (1 decks)

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