NIOSH 7400 Method Questions with 100 % correct answers

The current PEL (fibers/cc) is: - 0.1 TLV is a copyrighted trademark for threshold limit value. these health standards are published by which association, professional society, agency, etc? - ACGIH (association advancing occupational and industrial health) 7 fibers per square millimeter is associated with the - LOD (limit of detection) 100 fibers per square millimeter is associated with the - limit of quantitation, and minimum specified count range the minimum flow rate (L/min), for a 25 mm diameter filter, specified by OSHA and NIOSH is - 0.5 the maximum flow rate (L/min) specified by Method #7400 is - 16. (OSHA=2.5) T/F: the resistance of the filter media and filter holder influences the calibration of a rotameter - True T/F: When calibrating a personal sampler (entire sampling chain), only the sampling pump needs to be connected to the calibrator - False a personal sampling pump should be calibrated to an accuracy or precision of + and - 5% - Precision the typical sampling area (sq mm) of a 25 mm filter is - 385 mm squared T/F: the median is the most common value found in the data - False T/F: the mean + and - (1.965 "CV" mean) calculated two numbers which could, for quality-control purposes, be called the upper and lower control limits - TrueT/F: a systematic bias tends to shift the accuracy of the data - True T/F: this equation: Av-(1.965*STD dev) calculates a value that has a 95% probability the data will be less than - false! T/F: the coefficient of variation (CV) is another name for the relative standard deviation (RSD or Sr). It is calculated by multiplying the average by the standard deviation - False: you divide the std deviation by the mean the average + and - (1.965 x CV x Average) calculates: - 2-sided upper and lower 95% confidence limits the average -(1.645*S) calculates: - lower 1-sided by 95% confidence limit T/F: the absolute accuracy of an asbestos analysis can be determined - false in a normal distribution: - mean=median=mode T/F: although confidence limit and control limit both are abbreviated CL, at times they both can be the same value - true