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Millwright > Trade Science > Flashcards

Trade Science Flashcards

1
Q

What does a Class 3 Lever look like?

A

Fulcrum is at the end. Effort is in the center. Resistance is at the other end.

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2
Q

What is Newtons First Law?

A

A body at rest will stay at rest and a body in motion will remain in motion at the same speed and in the same direction unless acted on by some unbalanced force.

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3
Q

What is Newtons Second Law?

A

The size of a net force on an object is equal to the product of mass and acceleration of the object.

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4
Q

What is Newtons Third Law?

A

For every action there is an equal and opposite reaction.

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5
Q

What is a compound?

A

The product of two or more atoms that unite chemically. This creates a substance that has properties different from those of the combining elements.

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6
Q

What is a Atom?

A

A singular unit of an Element.

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7
Q

What is an Element?

A

Elements are materials only containing one type of Atom.

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8
Q

What are Cohesive Forces?

A

Like molecules having a strong attraction to one another.

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9
Q

What are Adhesive Forces?

A

The attraction of unlike molecules.

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10
Q

What is the Equation for Density?

A

Density = Mass/Volume

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11
Q

Define Tensile Strength

A

The ability of a material to resist being pulled apart by external forces.

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12
Q

Define Ductility

A

The ability of a material to stretch and maintain a new shape.

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13
Q

Define Malleability

A

The ability of a material to be permanently deformed by compressive forces.

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14
Q

Define Toughness

A

The ability of a material to withstand shock loads.

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15
Q

Define Hardness

A

A materials ability to resist a force that is trying to penetrate it.

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16
Q

What is the rule of thumb for expansion and contraction of steel?

A

For every 150F change in temp, each inch of diameter and length changes by 0.001 inches

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17
Q

Starting from Aluminum name all the Galvanic Series Metals.

A

Aluminum
Magnesium
Chromium Iron and Steel
Cast Iron
Cadmium
Nickel
Tin
Lead
Brass
Copper
Bronze
Copper-nickel
Silver
Platinum
Gold

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18
Q

Define Viscosity

A

A measure of a liquids resistance to flow.

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19
Q

The higher the viscosity of a fluid means what?

A

The greater it’s resistance to being poured.

20
Q

What are the common units for gas under pressure?

A
  • Pascal = Pa or Kilopascal = kPa
  • pounds force per square inch = lbf/in^2 Or psi
21
Q

What does psig stand for?

A

Pounds per square inch gauge

22
Q

What does psia stand for?

A

Pounds per square inch absolute

23
Q

What is ATM?

A

A unit used to describe the average pressure exerted by earths atmosphere at sea level.

24
Q

What is 1 ATM equal to in kPa? What about bar? What about psi?

A

1 ATM = 101.35 kPa = 1 bar = 14.7 psi

25
Q

What is the absolute temperature scale for Celsius?

A

Kelvin

26
Q

What is the absolute temperature scale for Fahrenheit?

A

Rankine

27
Q

What are the units used to measure heat?

A

Joules (J)
Kilojoules (kJ)
British Thermal Unit (Btu)

28
Q

What is a Btu?

A

Heat needed to change 1lb of water by 1 Fahrenheit

29
Q

What is 1 kilojoule equal to in Btu?

A

1 kJ = 0.948 Btu

30
Q

What is 1 joule equal to in Newton meters?

A

1 J = 1 N•m

31
Q

What are the three ways heat travels from one object to another?

A

Conduction, Convection, Radiation

32
Q

What is sfpm?

A

Surface feet per minute. The amount of distance taken with a rotating surface. Used in imperial.

33
Q

What is power?

A

The rate at which work is done. Work needs displacement.

34
Q

What is the equation for work?

A

W = F•d

Force times displacement

35
Q

What is 1 Watt equal to in joules/sec?

A

1W = 1 J/s

36
Q

What is 1 hp = in Watts

A

1 hp = 746 W

37
Q

What is 1 hp equal to in footpounds per second?

A

1 hp = 550 ft.lbf/s

38
Q

How do you calculate the Mechanical Advantage of a belt drive?

A

MA = driver diameter /drive diameter

39
Q

How to do you find Mechanical Advantage of a Chain or Gear Drive?

A

MA = # teeth on driven / # teeth on drive

40
Q

Finish this: if the driven element is larger than the drive element, the rpm of the driven shaft is _____ than the rpm of the driver.

A

Less

41
Q

Give the equation to find Mechanical Advantages of rpm of drive and driven elements.

A

Rpm drive x diameter drive = Rpm driven x diameter driven

42
Q

What is the distance of two adjacent threads on a screw called?

A

Pitch

43
Q

When a screw is turned on full rotation the screw travels a distance equivalent to _______.

A

The pitch

44
Q

What is the equation for electrical Power?

A

P = Voltage x Current

P = V x I

45
Q

What type of drill is often used in drilling concrete holes?

A

Carbide Twist Drills

Millwright (15 decks)

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