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Plumbing/Gasfitting Period 1 (CND) > Math & Science Period 1 (CND) > Flashcards

Math & Science Period 1 (CND) Flashcards

1
Q

Anything that has mass and occupies space?

A

Matter

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2
Q

A substance that cannot be chemically reduced any further?

A

Element

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3
Q

A substance that has indefinite shape, indefinite volume & definite mass?

A

Gas

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4
Q

What kind of change is lead melting?

A

Physical change

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5
Q

Separation of water into hydrogen & oxygen is what type of change?

A

Chemical change

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6
Q

Liquid dishwashing detergent could be classified as ?

A

Adhesive

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7
Q

1 cu/ft of water = to_____LBS

A

62.4lbs

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8
Q

1 cu/ft = to _____ imp gal

A

6.24 imp gal

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9
Q

1 cu/ft = to _____ US gal

A

7.5 US gal

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10
Q

1 US gal water = to _____ LBS

A

8.33 LBS

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11
Q

1 Imp gal of water = to ____ lbs

A

10 lbs

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12
Q

Mercury in a glass tube could be classified as?

A

Cohesive or convex

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13
Q

The molecular attraction of the molecules to each other at the surface of the liquid is called?

A

Surface tension

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14
Q

The flow of solder into a joint is the result of ?

A

adhesion & capillary attraction

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15
Q

2 factors that affect the state in which matter exists?

A

Pressure & temp.

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16
Q

Relative density of mercury?

A

13.6

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17
Q

relative density of propane gas?

A

1.5

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18
Q

1ft2 = to _______ in2

A

144 in2

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19
Q

1ft3 = to _______ ft3

A

1728ft3

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20
Q

13,6 times heavier than water?

A

Mercury

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21
Q

Density of air?

A

.076lb/ft3 or 1.29kg/m3

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22
Q

1 boiler HP - to _______BTU

A

33,475 BTU

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23
Q

Relative density of water & air?

A

1 for water & 1 for air

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24
Q

The attraction between the same molecules?

A

Cohesion

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25
Q

The attraction between different molecules?

A

Adhesion

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26
Q

The ability of a liquid to rise or drop in small tubes inserted into the liquid?

A

Capillary Action

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27
Q

A column of 1” in height exerts a pressure of ?

A

.578 oz/in2

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28
Q

What is the formula for calculating the amount of material expands or contracts?

A

Length of Change= Original length x Coefficient of expansion x delta T

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29
Q

Correct definition of temperature is “ A measurement of…..”?

A

Molecular movement

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30
Q

You will not have _______ flow if you do not ream the pipe.

A

laminar flow

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31
Q

The relationship of the mass of a substance to its volume.

A

Density

32
Q

The relationship between different substances?

A

relative density

33
Q

Correct definition of heat is?

A

a quantity of energy

34
Q

The amount of heat required to rise the temp. of one unit of mass one degree?

A

Specific heat capacity

35
Q

Correct definition of latent heat is “Heat that causes a….”?

A

Change in state

36
Q

Formula for converting C* to F*

A

F* = (1.8 x C*) + 32

37
Q

Formula for converting F* to C*

A

C* = (F - 32) / 1.8

38
Q

The standard unit (SI) for length is?

A

Metre (m)

39
Q

The standard unit (SI) for volume is?

A

Cubic Metre (m3)

40
Q

The standard unit (SI) for mass is?

A

Kilogram (kg)

41
Q

The standard unit (SI0 for pressure, stress, & vacuum is?

A

Pascal (Pa)

42
Q

The standard unit (SI) for force is?

A

Newton (N)

43
Q

The standard unit (SI0 for energy is?

A

Joule (J)

44
Q

The numerator is ?

A

The top number on a fraction

45
Q

The denominator is?

A

The bottom number on a fraction

46
Q

To convert cubic feet to imperial gallons?

A

Multiply 6.24imp gal/ft3

47
Q

To convert cubic feet to US gallons?

A

Multiply 7.5 US gal/ft3

48
Q

Specific heat capacity of ice/steam?

A

.5 BTU’s or 2kj

49
Q

Latent heat of vaporization/condensation?

A

970 BTU’s or 2257KJ

50
Q

Latent heat of fusion/solidification?

A

144 BTU’s or 335KJ

51
Q

True or False: Heat energy always flows from the hotter object to the cooler object?

A

True

52
Q

Water is most dense at?

A

4C or 39F

53
Q

Heat that causes a change in temp. .only?

A

Sensible heat

54
Q

Specific heat capacity of water?

A

1 BTU or 4.2KJ

55
Q

3 common states of matter?

A

Solid, Liquid or Gas

56
Q

Heat that causes a change of state, not temp?

A

Latent Heat

57
Q

Latent heat of propane?

A

154 BTU/lb or 356 KJ/Kg

58
Q

The smallest unit of an element that can still retain its properties?

A

Atom

59
Q

Made up of molecules that contain two or more different kinds of atoms chemically joined?

A

Compound

60
Q

Combination of different molecules but are not chemically combined?

A

Mixtures

61
Q

Inch of water in height, the pressure increases to?

A

.0361 psi

62
Q

Foot of water in height, the pressure increases to?

A

.433 psi

63
Q

Metre of height, the pressure increases to ?

A

9.81 kpa

64
Q

Inch of mercury in height, the pressure increases to?

A

.491 psi

65
Q

Atmospheric pressure is considered to be?

A

14.7 psia, 29.92” Hg, 101kpa or 750 mm Hg

66
Q

Definition of pressure?

A

The force divided by the area

67
Q

Definition of Force

A

The Amount of push or pull exerted over the entire area

68
Q

Will not bend without breaking?

A

Brittle

69
Q

Maybe stretched or drawn to shape?

A

Ductile

70
Q

Can be beaten, rolled or squeezed to shape?

A

Malleable

71
Q

What happens to the volume of water as it nears the freezing point?

A

expands slightly

72
Q

Correct definition of coefficient of linear expansion?

A

The amount a material will expand for every degree of temperature change.

73
Q

Why do most solids and liquids expand when heated?

A

Molecules move faster and take up more space.

74
Q

Insulation on piping prevents what type of heat transfer?

A

Mainly prevents heat losses due to conduction.

75
Q

Which of the following is not a method of heat transfer?

1) radiation from the sun
2) radiation from a large rock
3) conduction to face cloth soaked in hot water
4) convection in a heated steel bar

A

Convection in a heated steel bar.

Plumbing/Gasfitting Period 1 (CND) (6 decks)

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