Lecture 4

Question 1

basic principles of Industrial Hygiene

Answer 1

1. anticipate hazards
2. recognize hazards
3. evaluate hazards
4. control hazards

Question 2

time-weighted average concentration equation

Answer 2

TWA = 1/8 * integral of C (t)

Question 3

principles of ventilation:

Answer 3

1. dilute the contaminant below the target concentration
2. remove the contaminant before workers are exposed

Question 4

2 types of ventilation system

Answer 4

1. positive pressure ventilation
2. negative pressure ventilation

Question 5

fans located at the exhaust end of the system, pulling air out. this ensures that leaks in the system draw air in from the workplace rather than expel contaminated air from the ducts into the workplace

Answer 5

negative pressure ventilation

Question 7

the most common example of local ventilation

Answer 7

hood

Question 8

a device that either completely encloses the source of contaminant and/or moves the air in such a fashion as to carry the contaminant to an exhaust device

Answer 8

hood

Question 9

always exposes the worker but in amounts diluted by fresh air

Answer 9

dilution ventilation

Question 10

airflow prevents worker exposure

Answer 10

hood ventilation

Question 11

always requires more airflow than local ventilation; operating expenses can be substantial

Answer 11

dilution ventilation