WCL Safety Standards & Regulations 3

Question 1

What shade number is recommended by ANSI Z49.1 for the filter lens when using shielded metal arc welding (SMAW) at 200–250 amps?

Accepted Answer

Shade 12

Answer

ANSI Z49.1 recommends shade 12 for SMAW operations in the 200–250 amp range.

Question 2

Which class of fire extinguisher is most appropriate for an electrical fire that ignites near welding equipment?

Accepted Answer

Class C

Answer

Class C extinguishers use non-conductive agents suitable for energized electrical equipment fires.

Question 3

Under Cal/OSHA, when must a confined space entry permit be obtained before a welder enters a tank to perform repairs?

Accepted Answer

When the space has any potential for hazardous atmosphere, engulfment, or entrapment

Answer

A permit-required confined space entry permit is mandated whenever any of the three hazard conditions (hazardous atmosphere, engulfment, or entrapment) may exist.

Question 4

Which personal protective equipment (PPE) is specifically required to protect against UV and IR radiation produced by the welding arc?

Accepted Answer

Welding helmet with appropriate filter lens

Answer

A welding helmet with an appropriate shade filter lens is required to block both UV and IR radiation from the arc.

Question 5

What is the primary purpose of the ventilation requirement in AWS D1.1 for welding in enclosed spaces?

Accepted Answer

To dilute and remove welding fumes and shielding gases below hazardous levels

Answer

Ventilation in enclosed spaces is required to dilute welding fumes and prevent oxygen displacement to safe levels for workers.

(WCL) Welding Certification Los Angeles Practice Test

(WCL) Welding Certification Los Angeles Practice Test

WCL Safety Standards & Regulations 3