CIH-Health risk& hazard communication Questions and Answers Latest Updated 2023

CIH-Health risk& hazard communication Questions and Answers Latest Updated 2023 Blood and urine samples for lead analysis are ashed in order to: concentrate the lead./destroy interfering organics The concentration of carbon dioxide often associated with indoor air quality complaints: Greater than 1000 ppm A room ventilation system has been designed to provide 5 CFM of outdoor air/person. Which statement best describes the situation? The ventilation rate would be insufficient for most environments A carbon dioxide concentration of 1800 ppm is measured in an occupied office space. This is cause for concern because: concentrations in this range, while well below the PEL, indicate a shortage of fresh outside air being supplied to the work area. The ACGIH has established the TLV-TWA as that concentration for a conventional 8-hour workday and 40-hour workweek, to which it is believed that nearly all workers may be repeatedly exposed, day after day, without adverse effect. The general guidance is that this level can be exceeded when: only for up to 3 times the TLV-TWA for no more than a total of 30 minutes a day. HMIS labels contain which of the following information? Health, fire, reactivity, personal protective equipment The Accident Prevention Manual is published by which of these organizations? NSC(The Accident Prevention Manual is published by the National Safety Council.) What does a "3" in the health section of a HMIS label mean? Very hazardous to health - avoid all routes of exposure(The HMIS is the hazardous materials identification system commonly used to identify chemicals. The rating scale is 0-4, 0 being the least hazardous and 4 being the most hazardous. Materials are rated for reactivity, flammability, and health hazards.) The NFPA diamond has four classes of materials by position and color on the diamond. The classes are: The four classes of materials and colors on the National Fire Protection Association ( NFPA ) diamond are: Health hazard - blue Flammability - red Reactivity - yellow Specific hazards - white Employees potentially exposed to a substance not regulated by OSHA, must use a combination of work practices, engineering controls, and PPE to reduce exposure below published exposure levels. These published exposure levels are: OSHA 29 CFR 1910.120 defines published exposure levels as NIOSH Recommended Exposure Limits (RELS) and ACGIH Threshold Limit Values (TLV's). In the course of an eight hour work shift, a maintenance mechanic works TWICE in the vicinity of an operation where the measured carbon monoxide concentration in the air at his breathing zone level is fairly constant at 50 parts per million. The first time he works for 3 hours in the morning and the second, he works 2-1/2 hours in the afternoon. All the other times, he worked in areas of the plant where his exposure to carbon monoxide was essentially zero. What is his time-weighted average exposure to carbon monoxide? (3 hr 50 ppm + 2.5 hr 50 ppm + 2.5 hr * 0 ppm)/8= (150 + 125)/8= 34 ppm An instantaneous exposure excursion to ammonia ranging up to 250 ppm should : be considered an unacceptable event.(An excursion of this magnitude of 10 times the TLV-TWA for a fast acting irritant would be considered unacceptable even if it was for a shorter period of time than the 15 minute STEL of 35 ppm.) By legislative fiat, who has the responsibility for conducting educational programs to ensure an adequate supply of qualified safety and health professionals? NIOSH, in the Dept. of Health and Human Services, has in its charter the directive to train safety and health professionals to ensure an adequate supply. By legislative fiat, who trains employers and employees? This duty is contained in the OSHA act itself: PL 91-596,section 21c. Calculate a worker's daily 8 hour exposure to a solvent with a current TLV of 100 ppm if he spends 1 hour at an operation where the concentration is 250 ppm, 4 hours at 200 ppm, 3 hours at 100 ppm. ppm = ((1 * 250) + (4 * 200) + (3 * 100))/(1 + 4 + 3)= 169 ppmObtained from (T1 * C1 + T2 * C2 + T3 * C3)/(T1 + T2 + T3) = ppm. Where the "skin" notation follows a Substance TLV, it refers to all of the following, except: Exposure to skin irritants The following are true regarding the TLV's for simple asphyxiants, with the exception of: Employees should not be exposed above 5000 ppm. The following are true regarding Category A3-Animal Carcinogens, except that the: available epidemiological studies confirm a slight risk of cancer in exposed humans. Particle size-selective TLV's ( PSS-TLV's) are expressed in the following forms, with the exception of: Alveolar particulate mass Which of the following does not have a "skin" notation with its TLV? Xylene Simultaneous exposures to toluene and xylene are: Additive Carbon disulfide (TLV = 1 ppm) levels in a manufacturing operation were controlled near 0.5 ppm, but rose to 3.0 ppm for 5 minutes, once each hour during the workday. Is this acceptable according to ACGIH guidelines? No(The recommended excursion factor is three times the TLV for no more than a total of 30 minutes during a workday. In the example, the concentration of carbon disulfide rose to 3 times the TLV for 5 minutes, once each hour, or 8 times for a total of 40 minutes. This is not an acceptable exposure.) The assessment of adverse effects on health through biological functioning evaluation is which of the following? A.Environmental assessment Medical monitoring(The measuring of biological functioning and the comparison of such measurements to baseline data is medical monitoring. Pulmonary function testing is an example of medical monitoring.)