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HET4 A/C > HETP4 A/C REVIEW > Flashcards

HETP4 A/C REVIEW Flashcards

1
Q

What is considered to be the ideal temperature and humidity in the truck cab?

A

70 to 78°F

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2
Q

Heat moves from _________ to ________

A

Hot to cold

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3
Q

Three methods of heat movement

A

Conduction convection and radiation

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4
Q

How is intensity measured

A

Thermometer

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5
Q

How is heat quantity measured?

A

BTU or British thermal unit
&
Kilojoules

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6
Q

What are three states of matter?

A

Solid, liquid, vapour

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7
Q

Describe latent heat

A

The change of state but not temperature

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8
Q

What are saturation points? Where are the saturation point located in the A/C system?

A

Saturation points are the transition of vapour to liquid or vice versa in the condenser or evaporator

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9
Q

What is the boiling point of R134A?

A

Zero psi or 15.6°F

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10
Q

What is superheat?

A

Superheat is the amount of vapour in the evaporator it deals with the increase in temperature without a change in pressure

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11
Q

Explain sub cooling

A

It deals with the amount of liquid in the condenser as the liquid decreases in temperature without any change in pressure

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12
Q

What is the chemical name of 134A and what colour container should it come in?

A

Tetraflouroethane
HFC
LIGHT SKY BLUE CONTAINER

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13
Q

4 types of oils:

A

Mineral
Poly Ester (POE)
Polyalkylene glycol (PAG)
Polyalphaolefins (PAO)

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14
Q

Which oils do not mix?

A

Mineral and PAG

POE mixes with everything (that hoe)

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15
Q

List of the four events of an AC system

A

Expansion
Evaporation
Compression
Condensation

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16
Q

What are two vital functions of the compressor?

A

Functions as a pump by moving oils and refrigerant through the system and also functions as a pressure device to allow the cycles to complete themselves

17
Q

What is the purpose of the read valves AC compressor?

A

The separate below and the high side

HET4 A/C (3 decks)

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