Question

a pneumatic drill is commonly used ______.

• in areas where fumes is a problem
• to supply compressed air to de - burr pipes
• when there is no source of electricity
• for intricate detail work

Explanation:

• Analyze each option:
• Option 1: Pneumatic drills are not primarily used for noise - related areas (they can be noisy).
• Option 2: Pneumatic drills use compressed air to operate, not to supply air to pipes.
• Option 3: Pneumatic drills are powered by compressed air, so they can be used when there is no electricity source. This makes sense as they don't rely on electrical power.
• Option 4: Pneumatic drills are more for heavy - duty work rather than intricate detail work (tools for detail work are usually more precise and smaller - scale).

Answer:

C. when there is no source of electricity