CHST Confined Space Entry and Rescue 2

Question 1

Under OSHA definitions, 'engulfment' in a confined space refers to:

Accepted Answer

The surrounding and effective capture of a person by finely divided solids or liquid

Answer

An entrant becoming disoriented due to toxic atmospheric conditions

Answer

The collapse of a confined space wall or ceiling onto an entrant

Answer

A rapid drop in oxygen levels that incapacitates an entrant

Question 2

When a non-permit confined space must be reclassified as permit-required, which condition most commonly triggers this change?

Accepted Answer

Work activities inside the space create additional hazards such as welding fumes or oxygen displacement

Answer

The space has not been inspected for more than 6 months

Answer

More than two workers are required to enter simultaneously

Answer

The space is accessed after normal working hours

Question 3

Which type of forced ventilation is most effective for purging a confined space of vapors heavier than air?

Accepted Answer

Forced air supply directed near the bottom of the space

Answer

Natural ventilation through the top opening only

Answer

Forced air supply directed through the top of the space

Answer

Exhaust ventilation from the top of the space only

Question 4

What information is NOT required on an OSHA-compliant confined space entry permit?

Accepted Answer

The employer's general liability insurance policy number

Answer

Acceptable entry conditions and atmospheric test results

Answer

The hazards of the permit space and measures to eliminate or control them

Answer

Authorized entrants and the entry supervisor

Question 5

A hydrogen sulfide (H₂S) concentration of 300 ppm inside a confined space represents what condition?

Accepted Answer

An IDLH (Immediately Dangerous to Life or Health) condition

Answer

An acceptable level that requires increased monitoring

Answer

A level requiring use of air-purifying respirators

Answer

A level that requires ventilation but permits continued entry

Question 6

In confined space operations involving multiple employers on a construction site, what does OSHA require?

Accepted Answer

Employers must coordinate entry operations and share information about space hazards with each other

Answer

Only the controlling contractor's safety program applies to all workers

Answer

Each employer must establish a completely independent entry program with no coordination

Answer

The employer with the most workers assumes full safety responsibility

Question 7

What is the purpose of 'isolation' as a hazard control step in confined space entry?

Accepted Answer

To physically disconnect energy sources and block introduction of hazardous materials into the space

Answer

To prevent unauthorized workers from approaching the permit space perimeter

Answer

To establish visual barriers around the confined space for emergency access

Answer

To separate the confined space from adjacent work areas using barricade tape