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HVAC 1005 & 1010 > Final > Flashcards

Final Flashcards

(100 cards)

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1
Q

Condensing is the change in state from a gas/vapor to a _________

A

Liquid

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2
Q

The ____________ gauge reads pressures above and below atmospheric pressure

A

Compound

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3
Q

Name the three types of heat transfer

A

Convection, conduction, and radiation

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4
Q

Define latent heat

A

Heat required to change a state of matter

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5
Q

A refrigeration compressor is designed to pump _________

A

Gas/vapor

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6
Q

What is it called when a solid changes to a vapor, bypassing the liquid state?

A

Sublimation

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7
Q

If changing water from 32F to 196F is it necessary to add latent heat

A

No

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8
Q

Name the three states in which most elements and compounds may exist

A

Solid, liquid, gas

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9
Q

Name the four components of the refrigeration system

A

Compressor, condenser, meter device, evaporator

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10
Q

When R-502 is at 248 PSIG, at what temperature will it begin to condense

A

111F (use PT Chart)

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11
Q

Convert 60C to Fahrenheit

A

140F = (1.8 x 60C) + 32

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12
Q

How many BTUs are in one ton of refrigeration

A

12,000

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13
Q

When an evaporator using R-12 is boiling the refrigerant at 26F, what is the suction pressure?

A

25 (use PT chart)

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14
Q

Sublimation is the changing of state from a solid to a liquid

A

False

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15
Q

By controlling the pressure on a liquid; different boiling temperature may be obtained

A

True

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16
Q

The specific heat of water is 0.5 BTUs

A

False

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17
Q

Heat is a form of energy

A

True

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18
Q

Copper will conduct heat better than glass

A

True

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19
Q

Heat transfer will take place between two objects of the same temperature

A

False

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20
Q

Magnetism is not a form of energy

A

False

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21
Q

Heat transfer is always from warm to cool

A

True

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22
Q

If the temperature of a refrigerant rises then the pressure will decrease, thus, it is inversely proportional

A

False

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23
Q

All liquids boil at the same temperature when under the same pressure

A

False

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24
Q

The formula to calculate BTUs is:
Q = specific heat x latent heat + temperature difference x weight

A

False

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25
For every pressure applied to a liquid, there is a definite corresponding temperature at which it will boil or condense
True
26
Approximately how many inches of mercury (manifold gauge) are equal to standard atmospheric PSIG pressure at sea level
29.92
27
Approximately how many inches of mercury is a perfect vacuum
30
28
What are the two most common refrigerants used in residential air conditioning
R22 and R410A
29
The amount of heat in BTUs required to raise the temperature of a substance one degree Fahrenheit is
Specific heat
30
Water, ice, and steam are an example of
The states of matter
31
The heat required to melt one pound of ice at 32F to water at 32F equals
144 BTUs
32
Zero gauge pressure corresponds to an absolute pressure reading of
14.696 psia
33
Which component is considered the “heart” of the refrigeration system
Compressor
34
Heat, being a form of energy, cannot be
Destroyed
35
Condensing is the change in state from gas/vapor to a
Liquid
36
What is the proper condensing temperature for R22 that has a pressure of 226 PSIG
110 (PT chart)
37
The unit for measuring the quantity of heat is called the
BTU
38
How many BTUs per hour are equivalent to one ton of refrigeration
12,000
39
Ice will begin to melt when it’s sensible temperature rises above
0C
40
The heat used to change a liquid to a gas is called the latent heat of
Vaporization
41
What an evaporator using R12 is boiling the refrigerant at 26F, what is the suction pressure
25.4 psig (PT chart)
42
All liquids boil at the same temperature when under the same pressure
False
43
Heat transfer is always from warm to cool
True
44
Hidden heat in refrigeration work is referred to as
Latent heat
45
How many watts are in 1 kilowatt
1000
46
Hidden heat is referred to as
Latent heat
47
This component rejects heat in a refrigeration system
Condenser
48
What color is a 30 pound cylinder of R22 refrigerant
Green
49
The Fahrenheit scale is based on boiling water having a sea level temperature of
212F
50
This gauge reads pressure above and below atmospheric pressure
Compound
51
The heat required to melt one pound of ice at 32F to water at 32F equals BTUs
144
52
The instrument used to measure the level or intensity of heat is called a
Thermometer
53
The amount of heat in BTUs required to raise the temperature of one pound of a substance one degree Fahrenheit is defined as
Specific heat
54
Magnetism is not a form of energy
False
55
Absolute zero on a Fahrenheit scale equals
-460
56
This substance takes up space and has weight
Matter
57
Which of the following causes a change in the state of a substance
Latent heat
58
A thermometer is used to measure
Sensible heat
59
Absolute zero on the Fahrenheit scale equals ______F
-460
60
Zero gauge pressure corresponds to an absolute pressure reading of
14.696 psia
61
Heat is a form of energy
True
62
Refrigerants should be operated at a temperature _______ their critical temperature
Below
63
What agency do the letters EPA stand for
Environmental protection agency
64
How many BTUs of heat per pound of water are required to vaporize 212F water
970
65
Convert 75F to centigrade
23.88C = .555 x (F -32)
66
How many BTUs of heat per pound of water are required to vaporize the water
970
67
What color is a 30 pound cylinder of R410A refrigerant
Pink
68
A liquid boils when its temperature is sufficiently raised or its pressure is sufficiently
Lowered
69
When R502 is at 248 psig, at what temperature will it begin to condense
110F (PT chart)
70
This substance takes up space and has weight
Matter
71
For every pressure applied to a liquid, there is a definite corresponding temperature at which it will boil or condense
True
72
What color is a refrigerant recovery cylinder
Yellow/gray
73
Heat transfer will take place between two objects of the same temperature
False
74
Absolute zero on the Celsius scale equals ______C
-273
75
Given two objects of the same size, the one that is ____ will absorb more radiant heat
Painted black
76
The instrument used to measure the level or intensity of heat is called a
Thermometer
77
The Fahrenheit scale is based on boiling water having a sea level temperature of
212
78
This component absorbs heat in a refrigeration system
Evaporator
79
Absolute zero on the Celsius scale equals
-273
80
What approximate temperature does brazing take place at
1200F
81
Name the three types of heat transfer
Conduction, convection, radiation
82
A thermometer is used to measure
Sensible heat
83
Heat, being a form of energy, cannot be
Destroyed
84
A refrigeration compressor is designed to pump
Vapor
85
This component absorbs heat in a refrigeration system
Evaporator
86
By controlling the pressure on a liquid, different boiling temperatures may be obtained
True
87
The unit for measuring the quantity of heat is called the
BTU
88
Ice will begin to melt when its sensible temperature rises above
32F
89
Which of the following causes a change in state of a substance
Latent heat
90
Convert 60C to Fahrenheit
140F = (1.8 x C) + 32
91
The measure of energy content of a substance
Enthalpy
92
Fluids which absorb heat and change state
Refrigerants
93
288,000 BTU/24 hrs
One ton of refrigeration
94
The amount of heat required to raise the temperature of one pound of water one degree Fahrenheit
British thermal unit
95
Measures pressures above and below atmospheric
Compound gauge
96
A substances mass per unit of volume
Density
97
The surrounding temperature of a motor
Ambient
98
Also called relative density
Specific gravity
99
Radiation, conduction, and convection
Methods of heat
100
A form of energy
Heat

HVAC 1005 & 1010 (12 decks)

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