Oxyfuel Equipment Review Activity

Question 1

Acetylene is explosive in air concentrations of ______

Answer 1

anywhere between 2.5% to 80%

Question 2

Acetylene under pressure greater than _______ is unstable.

Answer 2

15psi

Question 3

A flame rich in acetylene is called __________

Answer 3

carbonizing flame

Question 4

A fuel gas connector nut has _____ and is a left hand thread.

Answer 4

has a groove cut around it for identification

Question 5

A regulator malfunction that occurs when the valve on the high-pressure side of the regulator does not seat properly is called _______

Answer 5

creep

Question 6

A reverse flow check valves allows a gas to flow _______

Answer 6

in one direction only.

Question 7

A screeching sound from the tip indicates _____

Answer 7

burnback

Question 8

Backfire, burnbacks, and flashback; which is the most serious?

Answer 8

flashback

Question 9

Bull nosed fittings are found on _____

Answer 9

oxygen regulators

Question 10

cones being a paler blue indicate _____

Answer 10

oxidizing flame

Question 11

Flashback arrestors can be installed _________

Answer 11

at either the torch end of the regulator end.

Question 12

Flashback arrestors prevent ______

Answer 12

flames from the travelling in gases back from the torch handle to the regulator.

Question 13

Hoses for fuel gas coloured ______

Answer 13

red

Question 14

In acetylene gas pipeline systems or in splicing hose never use _________

Answer 14

copper tubing

Question 15

Liquid detergents should not be used to check for leaks on a oxy-acetylene set up because they _________

Answer 15

petroleum-based product and has ammonia

Question 16

_____ must always be considered a potential danger as it readily supports combustion and might react violently with some materials.

Answer 16

oxygen

Question 17

Never _____ regulators or torch parts

Answer 17

oil

Question 18

once the gas has passed through the master regulator in an acetylene manifold system the pressure in the open lines must not exceed _____

Answer 18

15 psi 103kpa

Question 19

Oxygen cylinders are ___ drawn.

Answer 19

hot

Question 20

Oxygen cylinder valves shout be ____ while in use.

Answer 20

opened fully