OHST Industrial Hygiene & Exposure Assessment 3

Question 1

According to the hierarchy of controls, which control method is considered most effective for eliminating chemical hazards?

Accepted Answer

Elimination or substitution of the hazard

Answer

Administrative controls such as job rotation

Answer

Personal protective equipment

Answer

Engineering controls such as local exhaust ventilation

Question 2

A local exhaust ventilation (LEV) system reduces worker exposure by:

Accepted Answer

Capturing contaminants at or near their source before they reach the breathing zone

Answer

Diluting contaminants with large volumes of fresh air throughout the workspace

Answer

Filtering and recirculating general room air throughout the facility

Answer

Increasing positive pressure to push contaminants toward building exhaust

Question 3

Which level of respiratory protection is considered the minimum for protection against nuisance dusts in an otherwise safe atmosphere?

Accepted Answer

N95 filtering facepiece respirator

Answer

Self-contained breathing apparatus (SCBA)

Answer

Powered air-purifying respirator (PAPR)

Answer

Full-face air-purifying respirator with combination cartridges

Question 4

OSHA requires employers to establish a written respiratory protection program when:

Accepted Answer

Any employee uses a respirator in the workplace

Answer

Airborne contaminants exceed IDLH levels only

Answer

Only supplied-air respirators are issued to employees

Answer

Employees voluntarily choose to wear any type of respirator

Question 5

What is the primary advantage of engineering controls over other control methods in industrial hygiene?

Accepted Answer

They reduce exposure without relying on worker behavior or compliance

Answer

They are always the least expensive option to implement

Answer

They can be implemented more rapidly than administrative controls

Answer

They eliminate the need for any worker training programs

Question 6

Under OSHA 29 CFR 1910.95, which elements must be included in a hearing conservation program?

Accepted Answer

Audiometric testing, training on hearing protection, and noise monitoring/controls

Answer

Area sampling, biological monitoring, and medical surveillance for all employees

Answer

Respiratory protection, hazard communication, and exposure recordkeeping

Answer

Ergonomic assessment, task rotation, and engineering redesign of equipment

Question 7

Job rotation as a control measure for chemical exposure is classified as which type of control?

Accepted Answer

Administrative control

Answer

Engineering control

Answer

Elimination control

Answer

Substitution control