CARO Emergency Response and Safety 2

Question 1

What is the IDLH (Immediately Dangerous to Life or Health) concentration for ammonia established by NIOSH?

Accepted Answer

300 ppm

Answer

NIOSH lists 300 ppm as the IDLH concentration for ammonia.

Question 2

What is the OSHA permissible exposure limit (PEL) for ammonia as an 8-hour time-weighted average?

Accepted Answer

50 ppm

Answer

OSHA 29 CFR 1910.1000 sets the ammonia PEL at 50 ppm TWA.

Question 3

An operator gets liquid ammonia splashed in the eyes. What is the correct first-aid action?

Accepted Answer

Flush with clean water for at least 15 minutes

Answer

Immediate, continuous flushing with water for at least 15 minutes is the standard first aid for ammonia eye exposure.

Question 4

Because anhydrous ammonia vapor is lighter than air, where would a leak typically accumulate in an enclosed machinery room?

Accepted Answer

Near the ceiling

Answer

Ammonia vapor has a density of about 0.6 relative to air, so it rises toward the ceiling.

Question 5

Where should the emergency shutdown switch for a refrigeration machinery room be located?

Accepted Answer

Outside the machinery room, near the principal entrance

Answer

Codes require the emergency stop to be outside the machinery room so it can be activated without entering a contaminated area.

CARO - Certified Assistant Refrigeration Operator Practice Test