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RACM > REF UNITS 1 to 2 > Flashcards

REF UNITS 1 to 2 Flashcards

1
Q

(1.1) What is the boiling point of water in Fahrenheit?

A

212F

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2
Q

(1.2) What is the difference between heat and temperature?

A

heat is the energy applied to the material to raise its temperature.

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3
Q

(1.2) What is atmospheric pressure at sea level in psi?

A

14.696 Psi(a)

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4
Q

(1.2) Define absolute zero

A

the temperature where no heat is present (-460 F or 0 R).

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5
Q

(1.2) How do you convert Celsius to Fahrenheit?

A

Fahrenheit = (Celsius X 1.8) + 32

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6
Q

(1.2) How do you convert Fahrenheit to Celsius?

A

Celsius = (Fahrenheit - 32) ÷ 1.8

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7
Q

(1.2) How do you convert Fahrenheit to Rankine?

A

Add 460

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8
Q

(1.2) How do you convert Celsius to Kelvin?

A

Add 273

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9
Q

(1.3) What does the first law of thermodynamics state?

A

matter can neither be created nor destroyed.

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10
Q

(1.3) What does 1 BTU represent?

A

The amount of heat energy required to raise the temperature of 1 pound of water by 1 degree Fahrenheit.

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11
Q

(1.3) How are heating and air conditioning systems rated?

A

In BTUs/hr

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12
Q

(1.4) Define heat transfer by conduction

A

heat energy traveling from molecule to molecule in the same substance (like heating a copper pipe).

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13
Q

(1.5) Define heat transfer by Convection

A

heat energy applied to a fluid (like air or water) which heats surrounding objects.

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14
Q

(1.5) Define natural convection

A

The natural rise ad movement of heated air.

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15
Q

(1.6) How much are you heated if you stand double the distance away from a heat source?

A

a 4th of the heat experienced at the square root distance of where you are now.

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16
Q

(1.6) What is the only transfer of heat that can occur through a vacuum?

A

Radiation.

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17
Q

(1.7) What is the specific heat for water

A

1BTU/lb/F

18
Q

(1.7) What is the specific heat of ice?

A

0.5BTU/lb/F

19
Q

(1.7) What is the specific heat of steam?

A

0.5BTU/lb/F

20
Q

(1.7) What is the specific heat of air?

A

0.24BTU/lb/F

21
Q

(1.8) Define latent heat

A

The heat added to a substance that changes it’s state, but not its temperature

22
Q

(1.8) What is the latent heat of fusion? (for water)

A

144BTU/lb

23
Q

(1.8) What is the latent heat of vaporization/condensation (for water)?

A

970BTU/lb

24
Q

(1.9) Define specific heat

A

the heat energy required to raise the temperature of 1 pound of a substance by 1 degree Fahrenheit

25
Q

(1.12) What is atmospheric pressure also known as?

A

standard condition

26
Q

(1.12) What tool uses mercury to measure atmospheric pressure?

A

a barmometer

27
Q

(1.12) How many inches of mercury is atmospheric pressure at 70F?

A

29.92 inches

28
Q

(1.12) How many inches of mercury does one psi equal?

A

2.036 Hg

29
Q

(1.13) What does gauge manifold use to measure pressure?

A

bourdon tube

30
Q

(2.2) Define mass

A

the property of matter that responds to gravitational attraction

31
Q

(2.2) Define Weight

A

the downward force that an object applies when at rest.

32
Q

(2.3) How is density measured?

A

lb/ft³

33
Q

(2.3) What is the density of water?

A

62.4lb/ft³

34
Q

(2.4) Define specific gravity

A

the density of a substance as a ratio compared to the density of water (expressed as a unitless number).

35
Q

(2.5) Define specific volume

A

The inverse of density. The space occupied per 1 pound of the substance.

36
Q

(2.6) What does Boyle’s law state?

A

P1 X V1 = P2 X V2

37
Q

(2.6) What does Charles’ law state?

A

P1 ÷ T1 = P2 ÷ T2

38
Q

(2.6) What is the name of the gas law that combines Boyle’s law and Charles’ law?

A

General Law of Perfect Gases

39
Q

(2.6) What does Dalton’s law state?

A

P1 + P2 = P3

40
Q

(2.12) How is work calculated and expressed?

A

work (ft-lb) = force (lbs) X distance (ft)

41
Q

(2.13) How is horsepower measured?

A

amount of work done/min. 1 HP = 33,000 ft-lb/min

42
Q

(2.14) How many watts is equal to 1HP?

A

746

RACM (23 decks)

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