What is the effect of mixing oil and compressed oxygen

A. an oxidizing flame

B. equal oxygen and acetylene pressure

C. explosion or fire

D. regulators will not squeak

The threads on an oxygen-adjusting screw should

A. be costed with nozzle dip

B. be coated with talcum powder

C. be oiled occasionally

D. never be oiled

When moving a compressed gas cylinder, a steel safety cap should be in place

A. to prevent damage to the flow meter

B. to prevent damage to the threads

C. to prevent damage to the valve

D. because the valves are very expensive

When arc welding between 100 and 200 amps, which filter lens is generally used

A. No. 4

B. No. 6

C. No. 10

D. either dark green or black

When arc welding, protective clothing should be worn by welders to protect them from

A. heat

B. arc rays

C. spatter

D. all of the above

Watching the arc with unprotected eyes is likely to cause a condition known as

A. arc flash

B. hot flash

C. red eye

D. blindness

An oxygen cylinder valve should be opened all the way to

A. equalize the acetylene pressure

B. insure a full flow of oxygen

C. prevent leakage around the valve

D. reduce condensation in the regulator

Acetylene becomes dangerous if used beyond

A. 15 psi

B. 5 psi

C. 3 psi

D. the oxygen working pressure

Before connecting a regulator to a cylinder

A. be sure the cylinder valves are closed tightly

B. check to see whether there is a gas leakage

C. crack the cylinder valve to blow out dirt from the outlet nozzle

D. clean the cover glass over the gauges

To prevent damage to a regulator

A. allow the gas to flow rapidly from the cylinder to the working pressure gauge

B. be sure the threads are free of dust

C. fully release the pressure-adjusting screw before opening the cylinder valve

D. turn the adjusting screw very slowly

When opening an acetylene cylinder, the valve should NEVER be opened

A. at a high rate of speed

B. more than one and one-half turns

C. more than five turns

D. less than five turns

To ensure safety in storing acetylene, the cylinder is

A. equipped with a special nozzle

B. filled with a limited amount of gas

C. made of seamless steel

D. packed with a porous material saturated with acetone

Oxygen pressure in a cylinder varies due to temperature. For safety, each cylinder is equipped with a/an

A. safety nozzle

B. protector cap

C. quick-action valve

D. burst disk

Safety glasses should be worn

A. when grinding

B. when welding

C. when chipping slag

D. at all times

The proper type of fire extinguisher to use on an electrical fire is

A. Type A

B. Type B

C. Type C

D. Type D

The minimum recommended distance that oxygen cylinders should be stored from flammable
materials is ______ feet

A. 5

B. 10

C. 16

D. 20

Welding machines are rated according to the

A. voltage output

B. watts per hour

C. duty cycle

D. ampere rating input

Arc welding helmets and shielding lens protect face and eyes from rays

A. argon

B. white light

C. laser

D. ultra-violet or infrared

A cover lens is used in a welding helmet to

A. act as s safety lens when grinding metal

B. aid vision when welding

C. retard ultra-violet rays

D. protect the filter lens

The only lubricant to use on an oxygen or acetylene regulator is

A. light oil

B. silicon base lubricant

C. vacuum grease

D. none at all