Bert
"The Basher"
"The Basher"
An air-sampling instrument’s ______________ refers to the delay between exposing the air inlet to a contaminated atmosphere and obtaining an accurate reading.
a. Specificity
b. Interference
c. Calibration
d. Response time
d. Response time
The Confined Spaces in Construction standard, unlike the General Industry standard, requires that a confined space:
a. Be continuously monitored for atmospheric hazards
b. Be tested or monitored as often as necessary to characterize atmospheric hazards
c. Have an established monitoring baseline in place for each space
d. Be periodically monitored for atmospheric hazards
a. Be continuously monitored for atmospheric hazards
Detector tubes can render valid gas and vapor readings to help assess the characteristics of atmospheres in confined spaces. The tube readings may be more useful than readings from a 4-gas monitor because:
a. Detector tube methods have very low sampling error rates compared to electrochemical gas sensors
b. Detector tubes have unlimited shelf life, therefore readings will be more reliable than gas sensors, which may degrade over time
c. Detector tube methods do not require calibration of the device, and are therefore more precise than gas sensors
d. Detector tubes offer greater specificity to many contaminants than do electrochemical or broad range sensors
d. Detector tubes offer greater specificity to many contaminants than do electrochemical or broad range sensors
The combustible gas sensor (% LEL) in a typical 4-gas monitor:
a. May be used to detect a wide range of flammable gases and vapors
b. May be used to detect airborne combustible dusts and mists
c. Effectively detects high flashpoint combustible liquids
d. Does not require the presence of oxygen in order to detect flammable gas
a. May be used to detect a wide range of flammable gases and vapors
When using a typical 4-gas meter (equipped with sensors for O2, LEL, H2S, and CO) in a confined space, which chemical would remain undetected by the gas specific sensors and the broad range sensors as the specific contaminant concentration increases (All four sensors remain at “normal” readings throughout sampling)?
a. Diesel fuel
b. Carbon dioxide
c. Argon
d. Methane
a. Diesel fuel
According to both General Industry and Construction PRCS standards and policies regarding atmospheric testing of a space for a current entry, under “alternate” entry procedures, OSHA will accept, at a minimum:
a. “Alarm only” devices to be considered acceptable direct reading instruments for initial (pre-entry) or periodic (assurance) testing
b. Historical atmospheric testing that was conducted continuously during previous permit space entries
c. “Safe for entry” level of 50 percent for the level of flammable or toxic substances that would constitute a hazardous atmosphere
d. Air testing that shows the composition of the atmosphere to which employees are exposed and are not to be considered exposure records under 1910.1020
c. “Safe for entry” level of 50 percent for the level of flammable or toxic substances that would constitute a hazardous atmosphere
An employer causes _____________ when a confined space is 20 feet deep with two openings at the top, and the employer provides only 3 feet of ducting from the face of the blower into one of the openings.
a. Short circuiting
b. The chimney effect
c. Friction losses
d. Cross contamination
a. Short circuiting
An employer has a blower connected to 25 feet of ducting. He places the duct around an opening, creating a 90 degree bend in the ducting. The employer has:
a. Violated the laws of ventilation
b. Decreased the amount of air the fan can move
c. Increased the flow of air to the space
d. Decreased the flow of air to the space
d. Decreased the flow of air to the space
Based on established ventilation principles and worker safety, the choice to use local exhaust ventilation (suction) rather than supplied air (blowing) would be most effective when:
a. Only one employee is entering the space
b. The space is very hot
c. The space is very large
d. The entrant is welding
d. The entrant is welding
Given the ventilation equation Q = VA, which of the following answers best describes how you could alter the duct to increase the air velocity?
a. Increase the diameter of the duct
b. Increase the surface roughness within the duct
c. Decrease the diameter of the duct
d. Increase the length of the duct
c. Decrease the diameter of the duct
The process of removing a permit space from service and completely protecting against the release of energy and material into the space is known as:
a. Verification
b. Inerting
c. Isolation
d. Certification
c. Isolation
The Effective Blower Capacity of a fan used for ventilating confined spaces specifically relates to:
a. The blower’s capacity to transport large particulates effectively from point to point
b. The time it should take for the blower to purge a space
c. The fan’s adjusted airflow capacity for a set of given duct angles and duct lengths
d. The rated fan capacity under harsh conditions of extreme temperature and humidity
c. The fan’s adjusted airflow capacity for a set of given duct angles and duct lengths
The most effective method for ventilating point sources of air contaminants in confined spaces is:
a. Forced air dilution ventilation
b. Natural ventilation
c. Local exhaust ventilation
d. Purge ventilation
c. Local exhaust ventilation
Which standards mandate entry under continuous forced air ventilation?
a. 1910.146(c)(4) and 1926.1203 (d), “Written permit space program”
b. 1910.146(c)(5) and 1926.1203 (e), “Alternate procedures”
c. 1910.146(c)(7) and 1926.1203 (g), “Reclassification”
d. 1910.146(d)(5) and 1926.1204 (e), “Evaluate space conditions”
b. 1910.146(c)(5) and 1926.1203 (e), “Alternate procedures”
The OSHA’s definition of a confined space in general industry includes:
a. Being more than 3.5 feet deep
b. One way in/one way out
c. Not designed for continuous employee occupancy
d. Has natural ventilation
c. Not designed for continuous employee occupancy
The atmosphere in a room contains 50 ppm methylene chloride (PEL = 25ppm), the room is approximately 20 x 10 feet square and 10 feet tall, contains one standard 80” tall doorway, and is not considered designed for continuous human occupancy. An employee enters the room without a permit. Does 1910.146 appear to be violated?
a. Yes, because methylene chloride is an acute hazard
b. No, because the room is large enough to bodily enter
c. Yes, because the room is permit-required
d. No, because the room is not a confined space
d. No, because the room is not a confined space
Of the following, which most likely would be considered a non-permit space?
a. Sewer manhole
b. Hazardous waste collection tank
c. Railroad tank car
d. Dropped ceiling
d. Dropped ceiling
Which one of the following conditions would require a confined space to be classified as apermit-required confined space?
a. The only hazard is the presence of 220-volt electrical lines encased within metal conduit
b. The only hazard is exposure to an acute toxin above its Permissible Exposure Limit, and which also impairs the ability to self-rescue
c. The only hazard is airborne asbestos (known carcinogen) exposure above the Permissible Exposure Limit
d. A fall from height, with the fall hazard being the only hazard in the space
b. The only hazard is exposure to an acute toxin above its Permissible Exposure Limit, and which also impairs the ability to self-rescue
Of the following chemical substances, which one is both a simple asphyxiant and a flammable gas?
a. Argon (Ar)
b. Methane (CH4)
c. Hydrogen sulfide (H2S)
d. Carbon dioxide (CO2)
b. Methane (CH4)
Which of the following would be considered a Permit-Required Confined Spaces (PRCS) per 1910.146?
a. A twenty gallon methylene chloride reactor vessel
b. An overhead crane cab which moves over a steel blast furnace
c. An eight foot deep excavation to construct new sanitary sewer piping
d. A 2000 gallon caustic soda tank with a 20” manway for inspection
d. A 2000 gallon caustic soda tank with a 20” manway for inspection