Study Guide 3 Flashcards
Which of the following is the best definition of response time as it applies to detection devices?
The period between beginning measurement and obtaining a reading
Detector tubes are used to:
Measure the concentration of know gases, vapors, and unknown hydrocarbons
Alpha & beta radiation survey meters usually display readings in:
Counts per minute
On a combustible gas indicator with a reading in % LEL, the reading indicates 0-100% of:
The lower explosive limit
The most common calibration gases for combustible gas indicators are:
Methane, pentane
Which of the following is true of direct read-out instruments?
Direct read-out instruments provide measurements in real time
Which of the following instruments should you use in a flammable atmosphere?
Instruments marked “intrinsically safe” or “UL or FM”
Which of the following is the best definition of relative response as it applies to detection devices?
The instrument’s reading compared to the calibration gas
If you are monitoring a gas with an LEL of 2% and your combustible gas indicator reads 50% LEL, what is the
actual percentage of gas in the atmosphere?
1%
An atmosphere is assumed to be oxygen-enriched if concentrations of oxygen are greater than:
23.5%
Vapor-protective clothing for hazardous chemical emergency response is described in:
NFPA 1991
Chemical protective clothing is specifically designed to:
Prevent or limit skin exposure
The process by which a chemical moves through a material by molecular means is called:
Permeation
Which type of respirator should be worn in emergency response?
Positive pressure self contained breathing apparatus
Which of the following organizations assigns protection factors to respirators?
NIOSH
The longest approved air line for supplied air respirators is:
300 feet
Support function garments should never be used for:
Emergency response
Liquid splash-protective clothing for hazardous chemical emergency response is described in:
NFPA 1992
Break though time refers to the time it takes for a chemical to:
Permeate protective clothing
Which type of resistance data is most valuable when using vapor-protective clothing?
Permeation
When must a decontamination area be set up?
Before personnel enter the Hot Zone
In emergency decontamination, which of the following is a primary concern?
Prevent severe injury.
If contaminants are corrosive, skin and mucous membranes must be flushed with:
Large amounts of water
Non-soluble contaminants should be removed from the skin with:
Liquid soap and water
Although other factors are involved, protective clothing is more likely to be permeated if:
The chemical is highly concentrated
