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Air Con > F-Gas 2 > Flashcards

F-Gas 2 Flashcards

1
Q

SI Unit of Standard measurement mass is?

A

Kilograms

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2
Q

SI Unit for measuring density is?

A

Kg/m3

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3
Q

Force in Newtons can be calculated by?

A

Mass x Acceleration

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4
Q

The function of the evaporator is to?

A

Convert refrigerant at low pressure saturated mixture to superheated vapour

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5
Q

If a refrigerant is superheated then it is a?

A

Vapour above its saturation temperature

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6
Q

A Refrigerant that is a zeotropic blend will?

A

separate in the evaporate

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7
Q

A Frozen food cabinet is to be kept at -20C, the evaporating temperature would be?

A

-30C

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8
Q

A Liquid line sightglass is continuously showing bubbles, this would mean

A

Shortage of refrigerant

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9
Q

The gas that is most damaging to the ozone layer is?

A

Chlorine

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10
Q

Which of these gases are not covered by the Kyoto protocol?

A

Hydrocarbons (HCs)

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11
Q

Under f-gas regulations a system containing 5 or more tonnes CO2-eq of HFC Refrigerant must be?

A

Leak test every 12 months and a record kept.

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12
Q

The amount of liquid refrigerant a liquid receiver should be able to hold is?

A

More than the total charge of the system

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13
Q

The types of valves that potentially leak the most would be?

A

Line tap valves

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14
Q

The type of compressor that has potentially the highest risk of leakage is?

A

An Open type

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15
Q

The component in the system that rejects heat from the refrigerant into the ambient air is?

A

The condenser

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16
Q

If the internal tubing of a condenser got blocked the outcome would be?

A

High pressure build up in the discharge line

17
Q

The ozone depleting substances (ODS) Regulations will make it illegal to?

A

use HCFC’s after 2015

18
Q

When should a system with 5 tonnes of co2 eq and an LDS and without an LDS be leak checked?

A

12 months with and 24 months without

19
Q

When should a system with 50 tonnes of co2 eq and an LDS and without an LDS be leak checked?

A

6 months without and 12 months with

20
Q

When should a system with 500 tonnes of co2 eq and an LDS and without an LDS be leak checked?

A

Has to have an LDS and 6 months with one.

21
Q

Suction line filter drier should be located just upstream of the?

A

Compressor inlet

22
Q

TXV Valve maintains the pressure difference between what?

A

The condenser and the evaporator

23
Q

The condenser changes refrigerant from a what to a what?

A

a high pressure vapour to a high pressure liquid

24
Q

What refrigeration has the highest ODP?

A

CFC (Chlorofluorocarbon)

25
Q

Recovered refrigerant is stored in what bottle?

A

Grey with Yellow top

26
Q

The liquid line connects the what to the what?

A

Condenser to the expansion device

27
Q

An open drive compressor is most likely to develop a refrigerant leak where?

A

In the shaft seal

28
Q

The main function of the condenser is to?

A

Remove heat from the refrigerant

29
Q

The suction accumulator helps prevent flood back when?

A

An evaporator fan is not running

30
Q

Temperature differential across a filter drier indicates what?

A

A Restricted filter drier

31
Q

Reduced heat transfer through the coil would indicate what?

A

An oil-logged evaporator

32
Q

Zeotropes R number is?

A

R400

33
Q

Azeotropes R number is?

A

R500

34
Q

ODS Regulations made it illegal to use what after 2015?

A

HCFC’s

35
Q

If the internal tubing of a condenser got blocked the outcome would be?

A

High pressure build up in the discharge line

36
Q

Pressure =

A

Force / Area

37
Q

Density =

A

Mass / Volume

38
Q

Force =

A

Mass x Acceleration

39
Q

How to stop evaporating pressure from dropping?

A

Keep coil and air filter clean

Air Con (2 decks)

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