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heavy equipment tech > section one work place safety tools & materials > Flashcards

section one work place safety tools & materials Flashcards

1
Q

list 4 angles of importance & amount on sharpened point of drill bit

A

1) cutting edge or point angle 59degree
2) included angle 118degree
3) lip clearance 12-15degree
4) dead center angle 120- 130 degree

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2
Q

degree of general cutting edge on a chisel

A

60-70 degree

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3
Q

chisel use for cleaning up square keyways

A

cape chisel

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4
Q

Graduations on imperial dial indicators are in how much of an inch?

A

thousands of an inch

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5
Q

When heavy loads are transmitted between the shaft and the pulley what kind of key is used?

A

A gib Head key is used.

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6
Q

Which of the following types of portable fire extinguishers is classified as the best type of extinguisher to use on a diesel fuel fire?

A

Class B

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7
Q

properties of oxygen are

A

colorless, tasteless, greatly speeds up combustion. (if oil or grease is exposed to pure o2 under pressure, it can explode without flame or spark

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8
Q

o2 used in oxyacetylene system is what % of pure O2

A

99.5% pure O2

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9
Q

true or false: when a cylinder runs out of gas, you must leave cylinder open

A

false

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10
Q

how much pressure dose an O2 cylinder take when filled

A

2175psi or 15000kpa at room temp or 21*C

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11
Q

true or false: the color of cylinder corresponds to content

A

false whims indicates content

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12
Q

what way would you know if a tank is empty

A

mt written on tank

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13
Q

when do you remove metal cap on cylinders

A

when cylinder is on cart & ready to use

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14
Q

what threads would you see on O2 cylinder

A

r.h thread

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15
Q

what safety component is used on a O2 tank if there would be a fire, or if exposed to high pressure

A

frangible disk

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16
Q

what pressure will the frangible disk on O2 tank rupture

A

3200 psi

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17
Q

true or false: when opening an O2 tank you want to open valve all the way

A

true ( back seat O2 valve)

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18
Q

what’s back seating on O2 tank

A

when valve is open all the way when in use

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19
Q

at what pressure dose acetylene become unstable

A

15psi

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20
Q

what are some properties of acetylene

A

colorless with a garlic like odor & can be smelled at concentration of 1%

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21
Q

acetylene is the same weight as air, what can this cause?

A

the gasses will collect in pockets & can be considered explosive

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22
Q

why is acetone use when filling acetylene tank

A

acetylene tank is filled with 40% acetone. acetylene is mixed with acetone for storing past 15psi

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23
Q

what is draw limit referring too on acetylene tank

A

the maximum amount of acetylene that can be take from acetone

24
Q

a cylinder must be emptied no faster than____?

A

a cylinder must be emptied no faster than 1/7th of capacity per hour or less than 7 hours

25
Q

the maximum safe pressure for acetylene is ___

A

15psi

26
Q

how will you be able to tell when acetone is being drawn?

A

the flame will be cooler & with pale blue color with orange flecks in flame

27
Q

why is it so bad to draw acetone?

A

the acetone being solvent will cause damage to tips, plastics, rubber parts of regulator, hoses & torch assembly

28
Q

why do they use porous filler on acetylene tanks?

A

the porous filler is used to mix the acetylene & acetone together for safe storage

29
Q

what safety component is used on a acetylene tank if there would be a fire, or if exposed to high pressure?

A

fusible metal plug that will melt out at 100*C & allowed a controlled release

30
Q

true or false: you can exceed draw limit if torch tip is too big

A

true, if tank is too small and torch tip is too big, you can easily exceed draw limits, see manufacture for consumption spec

31
Q

common locations for fusible plugs are:

A

1) on concave bottom of the cylinder
2) a filled passage on the back side if the cylinder valve
3) on the reinforcing collar or neck ring
4) the shoulders of the cylinder

32
Q

what kind of threads would you see on an acetylene cylinder?

A

L.H threads would be used

33
Q

what 2 types of valves are commonly used?

A

1) recessed valve

2) exposed valve

34
Q

what would the difference be between 2 valves used?

A

1) recessed valve dose not need metal cap for storage or transportation & uses t-wrench
2) exposed valve needs the use of metal cap for storage & transportation

35
Q

when opening valve on acetylene cylinder, how much do you need to open valve

A

just enough flow for heating & cutting, usually one turn this way in event of a fire can turn tank off quickly

36
Q

what would another name for propane be?

A

LPG, or liquid petroleum gas

37
Q

how much will a LPG tank be filled?

A

a LPG tank will never be filled more than 80% of max volume

38
Q

what is recommended speed at witch to use hacksaw

A

40 to 50 strokes per min

39
Q

what is the boiling point for propane

A

-42.2*C

40
Q

is propane heavier or lighter than air?

A

propane is heavier

41
Q

liquid propane when exposed to atmospheric pressures will expand ____ times its volume in gas

A

270 times its volume in gas

42
Q

as outside temperatures lower what will happen to LPG?

A

vapor pressures will lower as temps lower till -42*C then there will be no vapor pressure in cylinder

43
Q

what is rang of flammability referring to?

A

rang of flammability is referring to the rang of fuel/air mixtures through witch fuel will burn

44
Q

what rang of flammability will LPG burn?

A

LPG will burn if gas in air is between 2.4%-9.5%

45
Q

true or false: LPG will still burn if range of flammability excides 9.5%?

A

true, the outer edges of the main body of gas will still be able to ignite & burn & will cause air movement mixing gasses further

46
Q

is LPG toxic?

A

no, but can still be deadly by displace oxygen in blood stream. large amounts will cause asphyxiation

47
Q

what two way would a cylinder or tank be filled?

A

1) volume

2) weight

48
Q

what level is the maximum level must a cylinder be filled?

A

80% to allow the room for expansion

49
Q

what is the 2 purposes of a regulator?

A

1) maintain constant pressure as cylinders being used

2) lower tank pressure to a working pressure

50
Q

what are the 4 different kinds of flames

A

1)carbonizing flame
2) neutral flame
3) oxidizing flame
$) acetylene flame

51
Q

what flame do you look for when cutting or heating?

A

neutral flame

52
Q

what pressure to use when purging oxyacetylene systems?

A

5psi on both acetylene & O2

53
Q

what is minim burst pressure of hose to be used on oxyacetylene

A

400psi

54
Q

good tips to prevent flash backs

A

1) purge each hose individually
2) install 1 way check valves
3) adhere to recommended set-ups & procedures
4) keep equipment in good repair
5) balance gas pressures when heating

55
Q

what goggles should be used when using oxyacetylene?

A

4 or #5

56
Q

what angle would you cut with a cutting torch?

A

inclined more for thinner materials

heavy equipment tech (2 decks)

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