CIH CIH Industrial Hygiene Sampling & Monitoring 2

Question 1

Which instrument is most commonly used for real-time measurement of particulate matter in workplace air?

Accepted Answer

Direct-reading aerosol photometer

Answer

Direct-reading aerosol photometers measure light scattering from airborne particles to provide instantaneous particle concentration readings.

Question 2

What particle size fraction is collected by an inhalable particulate matter sampler?

Accepted Answer

Particles up to 100 µm aerodynamic diameter

Answer

Inhalable particulate matter samplers collect particles up to approximately 100 µm that can be inhaled through the nose and mouth.

Question 3

The ACGIH threshold limit value (TLV-STEL) represents maximum exposure for what duration?

Accepted Answer

15 minutes

Answer

The TLV-STEL is a 15-minute short-term exposure limit that should not be exceeded during any part of the workday.

Question 4

What is the purpose of a blank sample in an industrial hygiene sampling campaign?

Accepted Answer

To detect contamination from media preparation or field handling

Answer

Field and media blanks detect background contamination introduced during manufacturing, shipping, or field handling of sampling media.

Question 5

Which pump flow rate is typically used for collecting respirable dust using a 10-mm Dorr-Oliver cyclone?

Accepted Answer

1.7 L/min

Answer

The 10-mm Dorr-Oliver nylon cyclone is operated at 1.7 L/min to achieve the respirable size-selective cut point per NIOSH methods.

CIH - Certified Industrial Hygienist Exam Practice Test