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CHST Exam Questions with Complete Answers
NOT considered a significant factor in determining the outcome of an electrocution event? - ANSWER 29 CFR 1910.1001, the allowable eight-hour exposure limit concentration to asbestos fibers is not to exceed which of the following? - ANSWER 0.1 fiber per cm 29 CFR 1910.25-1910.27, the maximum length a single ladder or a single section of ladder may be is __________. - ANSWER 30 feet Which of the following is NOT stipulated as a hazardous waste material attribute to which the U.S. Environmental Protection Agency extends a designated waste code (e.g., #D001), as per 40 CFR 261, Subpart C? a. Toxicity b. Corrosivity c. Mutagenicity d. Ignitability - ANSWER Ignitability At what minimum frequency must electrical-insulating gloves be tested to ensure they adequately protect workers against electrical shock? - ANSWER 6 month intervals The most useful tool that CHSTs can potentially use for evaluating system safety levels at smallerscale worksites is a(n): a. Failure modes and - ANSWER JSA If 25 or more employees are to be working underground at the same time, which of the following safety procedure(s) must be in effect? - ANSWER Two separate, independent telephone lines to the underground must be active and operational. If a five-foot deep trench is dug in clay material, what angle must the trench wall not exceed? - ANSWER 53 degrees
"Lifting index" (LI) is calculated by? - ANSWER dividing the load weight by the recommended weight limit (RWL) "Flash point" is most accurately defined as? - ANSWER the lowest temperature at which a flammable liquid can form an ignitable mixture in air. what does a mobile-crane operator need to be aware of in order to ensure a safe lift? - ANSWER - Whether outriggers are ended or retracted
- angel of the boom
- if tires are inflated
- ensure the crane is level
- extended outriggers are supported To what part of the body does a body harness typically NOT distribute any significant fall-arrest force? - ANSWER lower back "Recommended weight limit" (RWL) is most accurately defined as? - ANSWER the weight that healthy workers could lift for up to eight hours without causing musculoskeletal injuries The Heinrich "incident to injury ratio" model states that for every 330 accidents, _______ result in no injuries, _______ cause minor injuries, and _______ cause(s) major injuries. - ANSWER 300:29:1. "three E's of safety"? - ANSWER engineering, education, enforcment Total case incident rate (TCIR) is calculated via which of the following? - ANSWER the number of OSHA-recordable injury cases in a year per hundred full-time employees Which type of incident usually accounts for the highest fatality rate in the construction industry? - ANSWER Falls
29 CFR 1910.242, the compressed-air pressure limit for cleaning operations shall not exceed ________ pounds per square inch. - ANSWER 30 psi Anchor points for personal fall arrests should be capable of holding __________ pounds per person - ANSWER 5000 Cranes and derricks must be clear of power lines by at least _____ feet for voltages up to _____ kV - ANSWER 10 feet for voltages up to 50 kV and 10 feet plus 0.4 inch for each kV over 50. The ISO 14001 environmental management system is built upon which model? - ANSWER plan- do-check-act model Combustible liquids that are not stored within the confines of a "designated" outside storage area must: - ANSWER completely surrounded by a curb structure or enclosure that is at least six inches in height. Per OSHA's 29 CFR 1904.6 (Recordkeeping Standard), for how long must a document such as the OSHA 300 Log be retained? - ANSWER five years following the end of the calendar year that the records cover. The OSHAS 18000 series of occupational health and safety management system standards have the overarching goal of: - ANSWER proactively identify and respond to risk before an accident or incident occurs. A cut-off wheel that has a diameter in the range of 6-12 inches can cut a material with a maximum thickness of: - ANSWER ¼ inch. Per OSHA 29 CFR 1910.1025, the action level for lead (Pb) exposure is 30 micrograms per cubic meter of air, averaged over an eight-hour period. What is the permissible exposure limit? - ANSWER 50 micrograms per cubic meter of air, averaged over eight hours
The construction health & safety technician can best identify potential workplace hazards via: - ANSWER conduct of a rigorous worksite analysis What type of OSHA violation can result in a fine of up to $250,000 if an employee death occurs?
- ANSWER Willful Violation acceleration of gravity constant? - ANSWER 32.2 ft/sec 2 "floor-hole" is dimensionally defined as: - ANSWER a (measurable) hole with a range between 1 and 12 inches. ASTM D 120-09 requires that rubber-insulating gloves for use in live electrical work exceeding ______ must be ______. - ANSWER 50 volts, type 1 NOT an example of "point-of-operation" guarding? - ANSWER Ring guards At a construction worksite, what is NOT a system or device that is typically employed for limiting falls? - ANSWER Pitons and safety cables the use of fall-protection equipment must be used when a construction worker is at least _______ above the ground. - ANSWER 6 ft During a rigging inspection, if the thrat opening of a hook has increased in excess of ______ percent of the original throat opening, it should be replaced. - ANSWER 15 What is the definition of an "on-scene coordinator"? - ANSWER the individual who is in charge of coordinating various agencies and departments to ensure that all needs are responded to during and after an event.
Routinely scheduled inspections are an integral part of an effective occupational health and safety system. As such, the frequency of inspections must be aligned with the ___________ posed by an operation, in conjunction with ____________. - ANSWER degree of risk Which of the following procedures is NOT typically regarded as a safeguard against machine and tool accidents? - ANSWER Ensuring proper lockout and tagout protocol while machines or tools are being used "Variance" is thus calculated - ANSWER the square of the standard deviation of that population Which of the following substances would be appropriate for extinguishing a fire caused by flammable liquids? a. Halon b. Water c. Hydrogen peroxide d. Dry powder - ANSWER via the use of halon gas. Halon is also effective on electrical fires When developing a maintenance checklist, which of the following should be consulted most heavily in determining what items need to be checked and at what frequency? a. ANSI/ASTM standards b. Manufacturer specifications and product literature c. System procedures d. ASME recommended maintenance schedules - ANSWER manufacturer's specifications and product literature A "lagging" indicator is best defined or exemplified by? - ANSWER a metric or occurrence that has transpired after a workplace injury has occurred what is NOT a type of ionizing radiation? - ANSWER Microwaves reducing the risk of tripping hazards? - ANSWER Avoiding changes in elevation that consist of one or two steps
At a construction site, which of the following ionizing radiation sources could a worker most likely be exposed to? - ANSWER Radium and radon within earthen materials To effectively follow up on and correct audit findings, subject items should be appropriately organized into which of the following categorization groupings? - ANSWER Nonconformances - areas of concern - opportunities for improvement According to the "Human Factors Theory of Accident Causation," accidents are primarily caused by human error resulting from which of the following groupings? - ANSWER Overload - inappropriate response - inappropriate activities Besides keeping body parts and clothing away from hazardous machine components, what is the other PRIMARY function of machine guards? - ANSWER To prevent flying debris from striking people Risk is best defined as the multiplicative product of which of the following? - ANSWER Probability × consequence "Book value" is best defined as which of the following? - ANSWER Purchase price minus depreciation What are the four crucial elements for implementing a successful personal- protectiveequipment program? - ANSWER Selection, management, use, maintenance "latency period"? - ANSWER the amount of time between a hazardous exposure and the observable health effects due to that exposure An "asphyxiant" is best defined as? - ANSWER a material that displaces oxygen in air, thus interfering with normal breathing and sufficient oxygen transport in the bloodstream
Which of the following logs does NOT typically fall under the realm of "design documentation" for a construction project? - ANSWER Purchase order logs NOT beneficial for enhancing construction ergonomics? - ANSWER Dolly aligners What are the two primary U.S.-national accrediting agencies responsible for overseeing organizations that offer crane operator certification programs? - ANSWER ANSI and NCCA Which specific OSHA regulation addresses "Construction Worker Safety Training and Education"? - ANSWER 29 CFR 1926. Which of the following is NOT designated as a prime carcinogen per OSHA 29 CFR 1910.1003? - ANSWER Ammonium hydroxide General construction worksite (plant) areas and shops shall be illuminated at an intensity of no less than: - ANSWER 10 foot-candles Which of the following tools or resources is NOT specifically ascribed to within the realm of chemical hazard communication protocol, as per OSHA 1910.1200? - ANSWER NIOSH's REL compendium Safety-toe footwear for construction employees shall meet the requirements and specifications stated within: - ANSWER American National Standard for Men's Safety-Toe Footwear, Z41.1- 1967 Protective certified headwear (hardhats, helmets) must be worn in any construction area that entails hazards from direct impacts, falling objects, flying objects, burns, and ________________. - ANSWER Electrical shock Construction employees working over or near water, where the danger of drowning exists, shall be provided with: - ANSWER U.S. Coast Guard-approved life jackets or buoyant work vests
A "Type-A" rated fire extinguisher is effective against which type of fire? - ANSWER Flammable liquids Per OSHA 29 CFR 1926.555, which of the following is NOT a mandated requirement for conveyors used at a construction worksite? - ANSWER If the conveyor operator station is at a remote point, a stop switch for the conveyor motor shall not be provided at the motor location. Employees engaged in site-clearing activities shall be protected from the hazards of ___________ - ANSWER Irritant and toxic plants Which of the following is NOT a typical "shoring" technique used for trenching and excavating?
- ANSWER Base-mounted shoring construction tools or machines is NOT considered "high-risk"? - ANSWER Conveyor NOT a type of concrete or concrete-related operation used in the construction industry? - ANSWER Rubber cement requirement for a masonry-project "limited access zone"? - ANSWER The zone shall be equal to the height of the wall to be (re)constructed plus four feet, and shall run the entire length of the wall. Which type of soil does NOT have a low compressive strength? - ANSWER Clay loam What is the most frequently occurring injury resulting from electric shock? - ANSWER Burns Which of the following measures or techniques would NOT be considered effective against controlling static electricity? - ANSWER Ionic dampening
NOT an example of a compressed-air (pneumatic) tool used on a construction site? - ANSWER Brazing torch NOT a type of ventilation-measurement equipment? - ANSWER Damper hydrocouplings NOT an official OSHA violation category? - ANSWER Mitigation violation The term "TLV," in regard to hazardous chemical exposure, stands for which of the following? - ANSWER Threshold limit value A basic multimeter can be used to measure which of the following electrical parameters? - ANSWER Voltage, current, and resistance NOT a typical option used for the delivery of safety training? - ANSWER
