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Occupational Skin Diseases and Hygiene Discussion
QUESTION 1 1. Anthrax (cutaneous) is a skin disorder still found among U.S. tannery workers. True False QUESTION 2 1. For control of hazardous atmospheres in the worker’s breathing zone, the best form of ventilation is: A. General 2. B. Dilution Local exhaust None of the above C. D. QUESTION 3 1. For OSHA regulatory compliance, sound exposures are determined: A. By 2. dosimeters with a 5 dB exchange rate and 80 dB threshold B. With a type II, A-weighted, slow meter response survey meter With a type I, B-weighted, fast meter response precision meter Both A and B C. D. QUESTION 4 1. The cardinal rule of local exhaust system design is to design the enclosure or hood to enclose as much of the process as possible. True False QUESTION 5 1. This method of analysis of airborne contaminants is used primarily for organic vapors: A. Atomic 2. absorption B. Inductively coupled plasma emission spectroscopy gas chromatography followed by mass spectroscopy D. gravimetric, or simply determining the difference in weight of the collection media before and after sampling C. QUESTION 6 1. A sound pressure of 1.0 N/m 2 [Q ref = 0.00002 N/m 2] is a sound pressure level (Lp) of: A. 50,000 2. N/m2 B. C. D. 90.0 N/m2 93.9 dB 97.5 dB QUESTION 7 1. Natural ventilation is an accepted form of building ventilation used in certain occupancies in certain geographic locales. True False QUESTION 8 1. According to the American Society of Heating, Refrigeration, and Air conditioning Engineers (ASHRAE), the definition of acceptable indoor air quality is: A. Air 2. that comes entirely from outside the building B. Air which 80% of the people exposed will not express dissatisfaction Air with less than 5,000 ppm carbon dioxide Both A and C All of the above C. D. E. QUESTION 9 1. The sampling train order for calibration of a solid sorbent tube is (airflow: ->): A. Calibrator 2. -> sampling tube -> sampling pump B. Tube -> sampling pump -> calibrator Pump -> calibrator -> tube Pump -> tube -> calibrator C. D. QUESTION 10 1. Hearing loss related to noise alone results from: A. Prolonged 2. exposure to high sound pressures, typically greater than 85db-A B. Damaged hair cells in the cochlea Age Both A and B only C. D. QUESTION 11 1. The skin is the largest human organ, weighing in at about 20 Kg for a typical male of average height and weight True False QUESTION 12 1. If the OSHA PEL for continuous noise is 90 dB for 8 hours, and the exchange rate is 5 dB, indicate the allowable exposure for 1 hour. A. 100 2. dB B. 90 dB 105 dB 110 dB C. D. QUESTION 13 1. To function as a local exhaust system, the system design must include which elements? A. Enclosure 2. and low/no flow alarm B. Air filtration of exhaust Enclosure, duct, fan, motor, exhaust stack All of the above C. D. QUESTION 14 1. Permanent threshold shift (PTS), or hearing loss, attributable to age alone: A. Noise 2. induced hearing loss B. Conductive Sensorineural + conductive Presbycusis All of the above C. D. E. QUESTION 15 1. Dermatoses of occupational etiology result from which of the following? A. Mechanical 2. damage B. Chemical agents Biological agents Ultraviolet radiation All of the above C. D. E. QUESTION 16 1. Particulate sampling for the respirable dust fraction of an aerosol may be conducted with: A. An 2. SKC aluminum cyclone and appropriate filter cassette B. A nylon cyclone and appropriate filter cassette Charcoal, silica gel, XAD-2, or Tenax adsorbents Both A and B C. D. QUESTION 17 1. The typical US resident spends this amount of time indoors: A. 99% 2. B. 90% 80% 75% C. D. QUESTION 18 1. Indicate the sum for the following equation: 100 dB + 104 dB=? A. 102 2. dB B. 104 dB 106 dB 108 dB C. D. QUESTION 19 1. Ambient carbon dioxide levels of about 5,000 ppm are typical indoors. True False QUESTION 20 1. If an air bubble requires 28 seconds to go from the zero (“0”) mark of a calibration burette to the 100 milliliter mark, the flow rate (“Q”) of the sampling train is: A. 3.57 2. ml/sec B. 214 ml/min 0.214 liters per minute All of the above C. D. QUESTION 21 1. If you need to find out how to sample for airborne concentrations of “dimethyl death”, you would: A. Consult 2. the NIOSH Manual of Analytical Methods B. Call OSHA for instructions Read the material safety data sheet for “dimethyl death” Find the proper procedure in just about any textbook on IH sampling C. D. QUESTION 22 1. If an employee’s dosimeter indicates the total noise dose received is 100%, and he worked 4 hours to receive that dose, what was his time weighted average exposure? A. 200 2. B. 95 dB Somewhere between 96-101 dB 105 dB C. D. QUESTION 23 1. Hearing loss can be categorized as: A. Conductive 2. B. Sensorineural A, B, or both simultaneously None of the above C. D. QUESTION 24 1. The ventilation equation “Q = V x A” stands for “flow = velocity times area”. It is also known as: A. The 2. total pressure equation B. The dilution ventilation equation The continuity of airflow equation The universal flow equation C. D. QUESTION 25 1. Dry S-traps, roofing jobs, and user processes are all: A. Construction 2. activities related to indoor air quality B. Management slang for poor hygiene by employees Causes of indoor air quality issues Causes of moisture intrusion into building spaces C. D. QUESTION 26 1. This type of sample represents the instantaneous concentration of air in the place sampled, when the sample was collected. A. Short 2. Term Exposure Limit B. Grab sample Diffusion badge sampler result Charcoal glass tube result if collected for about 8 hours C. D. QUESTION 27 1. Chemicals are the most frequent cause of which of these conditions? A. Allergic 2. contact dermatitis B. Irritant contact dermatitis Chloracne C. D. All of the above QUESTION 28 1. This device measures ventilation pressures in the units of “inches of water” A. A2.pilot tube and manometer B. A hotwire thermoanenometer A vane axial fan None of the above C. D. QUESTION 29 1. Technique used by the IH to make an accurate in-duct average velocity measurement: A. Pitot 2. tube and manometer B. Face velocity measurement Pitot tube traverse Total pressure – velocity pressure = static pressure C. D. QUESTION 30 1. Two punch machines are operating next to each other. One machine has a measured noise level of 89 dB, and the other 89. If an employee spends an 8 hour shift working between the two machines (assume no noise controls, muffs, plugs, etc.), is the worker overexposed to noise? A. No, 2. up to and including 90 dB is allowed and that’s her exposure B. Yes, she is exposed to more than 90 dB No, the 89 dB reduces total exposure below the allowed limit Can’t tell. Octave Band Analysis would be required C. D. QUESTION 31 1. Given a 12 inch square exhaust system duct, with a velocity pressure reading of 1 inch water gauge, what is the flow through this duct? A. 12.cubic foot per minute B. 1 foot per minute 1 cubic meter per minute 4005 cubic feet per minute C. D. QUESTION 32 1. The OSHA PEL for this substance is weird, because unlike all other dusts and particulates, you actually have to calculate the allowable limit based on the percent silica in a bulk sample of the dust. A. Silica 2. B. C. D. Asbestos Talc and Limestone All of the above …
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