Module - Oxy-Fuel Equipment & Procedures Part B Flashcards Preview

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Flashcards in Module - Oxy-Fuel Equipment & Procedures Part B Deck (19):
1

Flat-faced fittings, found on some acetylene regulator stems, must be installed with a:
a) bull-nosed washer.
b) red brass washer.
c) yellow brass washer.
d) fibre washer.

d) fibre washer.

2

One use of a carburizing flame is:
a) flame cutting.
b) hard surfacing.
c) brazing of copper and its alloys.
d) searing of ground surfaces on cast iron.

b) hard surfacing.

3

A strongly oxidizing flame is used for:
a) silver brazing.
b) fusion welding of low-carbon steels.
c) searing of ground surfaces on cast iron.
d) aluminum brazing.

c) searing of ground surfaces on cast iron.

4

The area on a torch susceptible to backfires is the:
a) tip and mixer.
b) regulators and hoses.
c) needle valves.
d) handle.

a) tip and mixer.

5

One cause of a flashback in oxyacetylene equipment is:
a) loose or faulty seat connections between the tip and torch handle.
b) a hot tip.
c) too little gas speed.
d) grossly unequal pressures.

d) grossly unequal pressures.

6

In oxyacetylene cutting, the pressure at the regulators is relevant to:
a) the tip size and thickness of the metal to be cut.
b) balanced pressures and the size of tip.
c) the type of work material.
d) ferrous or non-ferrous metals.

a) the tip size and thickness of the metal to be cut.

7

When using an oxyacetylene torch for cutting, the cutting tip is:
a) always at 90º to the work material.
b) inclined more for thin material.
c) inclined more for thick material.
d) always at 90º to the work for thin material.

b) inclined more for thin material.

8

In silver brazing the filler metal fills the joint by:
a) fusion to the base metal.
b) liquidus and solidus reaction.
c) the grain structure opening up and tinning taking place.
d) capillary attraction.

d) capillary attraction.

9

To produce a high-strength joint with silver brazing the joint clearances should be:
a) 0.010 to 0.030 inch.
b) 0.100 to 0.300 inch.
c) 0.001 to 0.005 inch.
d) 0.100 to 0.500 inch.

c) 0.001 to 0.005 inch.

10

One of the principal functions of flux for silver brazing is to:
a) promote oxidization during heating.
b) absorb and remove oxides.
c) promote fusion between the base and filler metals.
d) help the braze welding process.

b) absorb and remove oxides.

11

The correct temperature is reached for braze welding when the grain structure opens up and:
a) tinning or amalgamation takes place.
b) the base metal starts to melt.
c) the base metal turns cherry red.
d) capillary attraction takes place.

a) tinning or amalgamation takes place.

12

A recommended type of joint to be used for braze welding is:
a) a square butt joint.
b) a close-fitting telescopic joint.
c) a joint having 0.005 to 0.010 inch clearance.
d) a 90º bevelled edge joint with the sharp edges removed.

d) a 90º bevelled edge joint with the sharp edges removed.

13

The type of flame used for braze welding of cast iron is:
a) oxidizing.
b) neutral to slightly oxidizing.
c) carburizing.
d) strongly oxidizing.

b) neutral to slightly oxidizing.

14

Propane gas:
a) is heavier than air.
b) in its normal state has a strong odour.
c) is lighter than air.
d) expands when changed to a liquid 270 times its volume.

a) is heavier than air.

15

Propane cylinders:
a) must be stored inside a building in a cool location.
b) must be filled to 95% of their volume.
c) must be stored in a cool place, never inside a building.
d) must be inspected once every five years.

c) must be stored in a cool place, never inside a building.

16

A thermocouple:
a) registers the temperature.
b) is constructed of two dissimilar metals that, when heated, discharge a small electrical current.
c) is mounted on a wall or stand on the outside of the heat-treating furnace.
d) does not get hot.

b) is constructed of two dissimilar metals that, when heated, discharge a small electrical current.

17

What two methods are there for piercing holes?

a) Travelling torch method
b) Still torch method

18

Contour cutting uses what angle of tip inclination?

Contour cutting uses a very small amount of inclinations, if any at all.

19

What are drag or lag lines?

Drag of lag lines are lines on the side of the work piece caused by the oxygen jet stream which can be used to determine the correct speed of travel.