November

Air Quality: The primary source of SO2 (sulfur dioxide) is:

Workplace Hazards: A degreasing system in which the solvent is heated via steam or electricity would typically be present in:

General Sciences: What is the approximate specific volume (ft³ per pound of air) for a location with the following conditions T = 70⁰F and P = 22.77" Hg?

IH Instruments: What detector is often used in a combustible gas indicator to determine the oxygen percent?

Diseases & Conditions: Pruritis is a condition describing:

Risk Assessment: One of the steps involved in performing a risk assessment includes:

Toxicology: The rate of absorption for chemicals is usually highest based on the hazard being:

IH sampling: Which of the following is/are important properties when describing silica gel sorbent media?

General Sciences: Bernoulli’s Law describes the relationship between:

General IH: Determine the 8-hour Time Weighted Average (TWA) given the following: 2 hours of exposure @ 350 ppm, 4 hours of exposure @ 200 ppm, 2 hours of exposure @ 50 ppm

Ventilation: Consider the following: A hood with a volumetric flow rate of 1500 cfm and an area of 1” x 72”. What is the face velocity?

Toxicology: The amount of a chemical in the air that kills 50% of the subject population is the:

Workplace Hazards: An employee working in a water treatment facility with the following symptoms may have been exposed to which of the following: Upper respiratory irritation, Eye irritation, Choking, Edema

Radiation: Given a reading of 200 mr/hour at 6 feet, what would be the reading at a distance of 20 feet assuming a point source?

Heat Stress: If a worker experiences the following: Metabolic rate = +200 watt, Radiant heat transfer rate = +160 watt, Convective heat transfer rate = -20 watt, Other transfers = negligible. How much evaporative cooling is needed to maintain thermal balance?

IH Sampling: When using a passive diffusion monitor, monitoring begins when:

General Sciences: Convert the following: 20 ppm of Carbon Disulfide (MW = 76.14) to mg/m³ at NTP (25⁰ C, 1 atm)

Toxicology: Formaldehyde is classified as a/an:

Indoor Air Quality: Relative humidity is dependent on:

Noise: What is the sound pressure level for a sound with a pressure of 3.45 dynes/cm²?

Ventilation: What is the effective ventilation rate (Q’) and the actual ventilation rate (Q) required to maintain the vapor concentration at the TLV if methyl isopropyl ketone is being evaporated from a tank at a rate of 1.0 pints every hour assuming the following? TLV = 200 ppm, MW = 86.14, SG = 0.81, K = 2

General IH: Which of the following filtration devices only removes the smallest particle size?

Ventilation: Which of the following is correct, regarding air pressure:

General Sciences: Estimate the density correction factor for air at T = 100˚F at 2,000 ft. above sea level (BP = 27.80” Hg)

Ventilation: For a given duct upstream of the fan with the following conditions, determine the approximate air velocity: TP = 1” w.g., SP = 2” w.g., d = 0.88

Epidemiology Which of the following terms describes the number of existing cases of a disease in a worker population at a specified time?

Radiation: Microwave ovens (household variety) operate at what frequency range?

Illumination: Eyes are most sensitive to what color region?

Heat Stress: Which of the following terms describes the process of heating the air which in turn heats the skin?

General IH: Air sampling accuracy is typically ________ of the true value:

Noise: What is the cumulative resultant noise exposure (approximately) for three machines with the following noise ratings (hint: use the shortcut method)?

1. 89 dB
2. 92 dB
3. 99 dB

Ventilation: What is the terminal settling velocity of a metal fume with a diameter of 1.0 µm and specific gravity value of 6.9?

IH Management Which motivation theory is represented by “the average worker seeks to accept responsibility and view work as a natural process?”

PPE Which term describes “the flow of chemicals via diffusion through a material?”