EXAM - Tunnel - Part 1

What is a tunnel?

• An artificial underground passage open at both ends

• A natural underground cave

• An artificial structure above ground

• A ventilation system

Which of the following is NOT a common purpose for tunnels?

• Highways

• Railways

• Sewerage

• Skyscraper foundations

When can tunnel work begin?

• Immediately after excavation starts

• After submission of the approved safety program

• Before safety provisions are followed

• After ventilation is installed

What must each underground employee carry?

• Water bottle

• Metal ID tag

• Handheld GPS

• Fire extinguisher

Which lighting standard is applicable in tunnel work?

• ANSI/IES RP-7

• IS 456

• ASTM D2487

• IRC 37

What type of lighting should be used within 50 ft of explosive areas?

• Fixed lighting

• Portable lighting

• Incandescent lighting

• Neon lighting

What type of electrical transformers are allowed underground?

• Oil-filled transformers

• Dry-type transformers

• Gas-insulated transformers

• Liquid-cooled transformers

What is the minimum distance for grounding conductive parts in tunnels?

• Every 500 ft

• Every 1,000 ft

• Every 1,500 ft

• Every 2,000 ft

How many self-rescuers are required underground?

• One for every five workers

• One per person

• One per rescue crew

• One per group of 10 workers

For a site with ≥25 workers underground, how many rescue crews are required?

• One crew of 5 members

• Two crews of 5 members each

• One crew of 10 members

• No dedicated crew required