section one work place safety tools & materials

Question 1

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

Answer 1

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

Question 2

degree of general cutting edge on a chisel

Answer 2

60-70 degree

Question 3

chisel use for cleaning up square keyways

Answer 3

cape chisel

Question 4

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

Answer 4

thousands of an inch

Question 5

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

Answer 5

A gib Head key is used.

Question 6

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

Answer 6

Class B

Question 7

properties of oxygen are

Answer 7

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

Question 8

o2 used in oxyacetylene system is what % of pure O2

Answer 8

99.5% pure O2

Question 9

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

Answer 9

false

Question 10

how much pressure dose an O2 cylinder take when filled

Answer 10

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

Question 11

true or false: the color of cylinder corresponds to content

Answer 11

false whims indicates content

Question 12

what way would you know if a tank is empty

Answer 12

mt written on tank

Question 13

when do you remove metal cap on cylinders

Answer 13

when cylinder is on cart & ready to use

Question 14

what threads would you see on O2 cylinder

Answer 14

r.h thread

Question 15

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

Answer 15

frangible disk

Question 16

what pressure will the frangible disk on O2 tank rupture

Answer 16

3200 psi

Question 17

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

Answer 17

true ( back seat O2 valve)

Question 18

what’s back seating on O2 tank

Answer 18

when valve is open all the way when in use

Question 19

at what pressure dose acetylene become unstable

Answer 19

15psi

Question 20

what are some properties of acetylene

Answer 20

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

Question 21

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

Answer 21

the gasses will collect in pockets & can be considered explosive

Question 22

why is acetone use when filling acetylene tank

Answer 22

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

Question 23

what is draw limit referring too on acetylene tank

Answer 23

the maximum amount of acetylene that can be take from acetone

Question 24

a cylinder must be emptied no faster than____?

Answer 24

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

Question 25

the maximum safe pressure for acetylene is ___

Answer 25

15psi

Question 26

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

Answer 26

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

Question 27

why is it so bad to draw acetone?

Answer 27

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

Question 28

why do they use porous filler on acetylene tanks?

Answer 28

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

Question 29

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

Answer 29

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

Question 30

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

Answer 30

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

Question 31

common locations for fusible plugs are:

Answer 31

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

Question 32

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

Answer 32

L.H threads would be used

Question 33

what 2 types of valves are commonly used?

Answer 33

1) recessed valve | 2) exposed valve

Question 34

what would the difference be between 2 valves used?

Answer 34

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

Question 35

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

Answer 35

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

Question 36

what would another name for propane be?

Answer 36

LPG, or liquid petroleum gas

Question 37

how much will a LPG tank be filled?

Answer 37

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

Question 38

what is recommended speed at witch to use hacksaw

Answer 38

40 to 50 strokes per min

Question 39

what is the boiling point for propane

Answer 39

-42.2*C

Question 40

is propane heavier or lighter than air?

Answer 40

propane is heavier

Question 41

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

Answer 41

270 times its volume in gas

Question 42

as outside temperatures lower what will happen to LPG?

Answer 42

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

Question 43

what is rang of flammability referring to?

Answer 43

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

Question 44

what rang of flammability will LPG burn?

Answer 44

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

Question 45

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

Answer 45

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

Question 46

is LPG toxic?

Answer 46

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

Question 47

what two way would a cylinder or tank be filled?

Answer 47

1) volume | 2) weight

Question 48

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

Answer 48

80% to allow the room for expansion

Question 49

what is the 2 purposes of a regulator?

Answer 49

1) maintain constant pressure as cylinders being used | 2) lower tank pressure to a working pressure

Question 50

what are the 4 different kinds of flames

Answer 50

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

Question 51

what flame do you look for when cutting or heating?

Answer 51

neutral flame

Question 52

what pressure to use when purging oxyacetylene systems?

Answer 52

5psi on both acetylene & O2

Question 53

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

Answer 53

400psi

Question 54

good tips to prevent flash backs

Answer 54

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

Question 55

what goggles should be used when using oxyacetylene?

Answer 55

#4 or #5

Question 56

what angle would you cut with a cutting torch?

Answer 56

inclined more for thinner materials