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HVAC UNIT 3 > REVIEW QUESTIONS > Flashcards

REVIEW QUESTIONS Flashcards

1
Q

Name three reasons why ice melts in an icebox

A

????

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2
Q

What is the approximate temperature for low temperature

A

0 to -10 f

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3
Q

What is the approximate temperature for medium temperature

A

35 to 45 f

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4
Q

What is the approximate temperature for high temperature

A

45f and up

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5
Q

One ton of refrigeration is

A

12,000 Btu/h

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6
Q

Describe briefly the basic refrigeration cycle

A

????

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7
Q

What is the relationship between pressure and the boiling point of liquids

A

Temperature/pressure

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8
Q

What is the function of the evaporator in a refrigeration or air conditioning system

A

Absorbs heat into the system

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9
Q

What does the compressor do in the refrigeration system?

A

It pumps heat through the system in the form of heat-laden refrigerant

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10
Q

Define a superheated vapor

A

??

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11
Q

Define the term subcooled liquid

A

??

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12
Q

What is meant by a saturated liquid and vapor

A

??

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13
Q

What is meant by desuperheating a vapor

A

Uy??

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14
Q

What happens to the refrigerant in the condenser

A

??

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15
Q

What happens to refrigerant heat in the condenser

A

??

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16
Q

The metering device?

A

??

17
Q

What is adiabatic expansion

A

?

18
Q

Describe flash gas, and tell how it affects system capacity

A

,??

19
Q

Quality means _______ when referring to a refrigerant

A

??

20
Q

Describe the difference between a reciprocating compressor and a rotary compressor

A

???

21
Q

cylinder color code for R-12

A

White

22
Q

cylinder color code for R-22

A

Green

23
Q

cylinder color code for R-502

A

Orchid

24
Q

cylinder color code for R-134a

A

Light blue

25
Q

cylinder color code for R-11

A

Orange

26
Q

cylinder color code for R-401A

A

Coral red

27
Q

cylinder color code for R-402B

A

Green brown

28
Q

cylinder color code for R-410A

A

Rose

29
Q

cylinder color code for R-404A

A

Orange

30
Q

cylinder color code for R-407C

A

Chocolate

31
Q

Define enthalpy

A

??

32
Q

Define net refrigeration effect as it applies to the refrigeration cycle

A

??

33
Q

Define flash gas

A

??

34
Q

Define temperature glide

A

??

35
Q

Define a zeotropic refrigerant blend

A

??

36
Q

Define a near-azeotropic refrigerant blend

A

??

HVAC UNIT 3 (2 decks)

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