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Of the following basic methods of controlling airborne contaminants, which would usually be considered the least acceptable
A) Continuous, enforced use of NIOSH-approved respirators
B) General exhaust ventilation
C) Isolation of the area where the contamination is generated
D) Local exhaust ventilation at the point of contaminant generation
Which of the following statements concerning respirator fit testing is true?
A) If a worker has had a quantitative fit test, qualitative fit testing is not needed as long as he or she continues to wear the same respirator.
B) Quantitative fit testing is less reliable than qualitative fit testing because it requires the use of special respirators equipped with sampling probes, rather than the actual respirator to be worn by the worker.
C) Quantitative and qualitative fit testing both require expensive, sophisticated equipment if they are to be performed properly.
D) The NIOSH-recommended approach to fit testing is to use quantitative fit testing during the respirator selection process, followed by periodic qualitative fit testing during actual respirator use.
A respirator is to be used to enter an enclosed space where the concentrations of oxygen and air contaminants are uncertain. Which of the following respirator types offers the minimum acceptable protection for this application?
A) A gas mask equipped with a back-mounted universal Type N canister.
B) A powered air-purifying respirator equipped with combination particle, vapor, and gas-removing cartridges.
C) A self-contained breathing apparatus operated in the demand mode.
D) A self-contained breathing apparatus operated in the pressure-demand mode Choose one of the above options and briefly explain your answer.
An organic vapor respirator has an assigned protection factor of 10. If the concentration of a particular organic vapor outside the respirator is 460 ppm, what is the nominal concentration inside the mask?
A) 46 ppm
B) 450 ppm
C) 470 ppm
D) 4600 ppm
The US EPA has developed Levels of Protections for Chemical Protective Clothing. One ensemble includes a Liquid-splash protective suit, Pressure-demand full-facepiece SCBA, Inner chemical resistant gloves, Chemical resistant safety boots, two-way radio, hard hat. This is an example of what level?
A) A
B) B
C) C
D) D

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University	National University of Singapore (NUS)
Subject	Fundamentals in Industrial Hygiene

Of the following basic methods of controlling airborne contaminants, which would usually be considered the least acceptable: Fundamentals in Industrial Hygiene Assignment, NUS, Singapore

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