Mixed Deck — All CHST Topics Flashcards

Fissured soil discovered during excavation typically indicates what type of soil classification?

Answer: Type B or C depending on other factors

Fissured soil is excluded from Type A classification and may be Type B or Type C depending on its other properties and conditions.

Under OSHA 1926.59 (Hazard Communication for construction), which of the following is a required element of a GHS-compliant chemical label?

Answer: Signal word ('Danger' or 'Warning'), hazard pictograms, hazard statements, precautionary statements, product identifier, and supplier information

GHS labels under OSHA's HazCom standard must include: product identifier, signal word, hazard pictograms, hazard statements, precautionary statements, and supplier information including name and address.

A competent person inspects a personal fall arrest system after an employee experiences a fall. What action is required?

Answer: The system must be removed from service immediately

OSHA 1926.502(d)(21) requires that fall arrest equipment subjected to impact loading be immediately removed from service.

Which of the following types of PPE is best for shielding the eyes from dust in a construction environment?

Answer: Safety goggles

Safety glasses don't offer as much protection from airborne eye threats such dust as goggles that seal with the forehead and temples. They can offer protection from projectiles that are launched into the air if they are approved for impact protection.

In order to achieve a safe lift, which of the following does a mobile crane operator NOT need to be aware of?

Answer: The width of the jib

A crane operator must be informed of the crane's capabilities and limitations in order to ensure a safe lift. Outriggers should always be used, and they should be placed on solid, level ground. How much of the crane's maximum rated load it can lift without tipping over will depend on the boom's angle. Finally, to lessen the chance of tipping, the tires must be fully filled.

What must be done before excavation work begins near underground utilities under OSHA 1926.651(b)(3)?

Answer: Contact utility companies and use detection equipment to determine the location of underground utilities

OSHA 1926.651(b)(3) requires that the approximate location of underground utilities be determined before opening an excavation, using utility notification systems (811 call), records, and detection equipment.

Under 29 CFR 1926.150, a fire extinguisher rated not less than 2A must be provided for each how many square feet of protected building area?

Answer: 3,000 sq ft

29 CFR 1926.150(c)(1)(i) requires one 2A-rated extinguisher per 3,000 square feet of the protected building area.

What is the purpose of a muster point in a construction site emergency plan?

Answer: A designated assembly area where workers gather after evacuation for headcount

A muster point is a predetermined assembly area where evacuated workers gather so supervisors can conduct a headcount and confirm everyone is accounted for.

Which instrument is used to measure a worker's personal noise dose over the course of a full work shift?

Answer: Noise dosimeter

A noise dosimeter is worn by the worker and integrates variable noise exposures over the entire shift to calculate a percent dose or TWA. A sound level meter gives instantaneous readings at a fixed point. An octave band analyzer characterizes frequency content for engineering control design. A vibration meter measures vibration, not sound.

Which condition would cause an excavation previously classified as Type A soil to be reclassified?

Answer: Previously disturbed soil is discovered beneath the surface

Previously disturbed soil cannot be classified as Type A; its prior disturbance reduces cohesion and stability.

Which class of fire extinguisher is specifically designed to fight fires involving energized electrical equipment on a construction site?

Answer: Class C

Class C extinguishers use non-conductive agents and are rated for energized electrical equipment fires.

A scaffold board breaks under a worker's weight but the worker grabs a guardrail and is uninjured. This is an example of what type of event, and why should it be investigated?

Answer: A near miss — it should be investigated because it reveals a hazard that, with a slight difference in circumstances, could have caused serious injury

A near miss is an unplanned event that did not result in injury but had the potential to do so. Investigating near misses allows hazard correction before a serious injury occurs.

When conducting a confined space entry on a construction site, which atmospheric condition requires immediate evacuation?

Answer: Oxygen level below 19.5% or above 23.5%

An oxygen-deficient atmosphere below 19.5% or oxygen-enriched atmosphere above 23.5% both represent immediately dangerous conditions requiring evacuation.

Which type of fire extinguisher is appropriate for Class C (energized electrical equipment) fires?

Answer: CO2 or dry chemical extinguisher

CO2 and dry chemical extinguishers are non-conductive and rated for Class C electrical fires; water-based extinguishers conduct electricity and are dangerous.

A CHST is pressured by a project manager to sign off on a scaffold inspection knowing the scaffold does not meet OSHA standards. According to BCSP's Code of Ethics, the CHST should:

Answer: Refuse to certify the scaffold and report the deficiency through appropriate channels

BCSP's Code of Ethics requires certificants to hold worker safety paramount above employer directives. Signing an inaccurate safety certification is both an ethical violation and potential legal liability. The CHST must refuse, document the deficiency, and escalate through appropriate channels (management, OSHA if necessary).

When using a chemical that has a flash point of 73°F (23°C) and a boiling point above 95°F (35°C), it is classified as a:

Answer: Flammable liquid (Category 2)

Under GHS/HazCom 2012, a flammable liquid with a flash point ≥23°C and ≤60°C and a boiling point >35°C is classified as Category 2 flammable liquid.

Which of the following DOES NOT play a key role in figuring out how an electrocution event may affect a worker?

Answer: The amount of electrically resistant material present in work boots and work gloves

The amount of current that flows through the body, the amount of time that a person is exposed to the current, and the precise direction the current follows all play a role in how an electrocution occurrence turns out.

Under OSHA 29 CFR 1926.1204, which of the following is a required duty of the entry supervisor for a permit-required confined space?

Answer: Verify that all conditions specified by the permit have been met before authorizing entry

The entry supervisor must verify that all permit conditions are met and sign the permit to authorize entry before any worker enters the space.

Hole covers used for fall protection on walking/working surfaces must be capable of supporting how much weight?

Answer: The maximum intended load and be secured against displacement

OSHA 1926.502(i)(3) requires covers to support at least twice the weight of employees, equipment, and materials and be secured to prevent displacement.

Which type of glove material provides the BEST protection against ketone solvents commonly found on construction sites?

Answer: Butyl rubber

Butyl rubber gloves offer superior resistance to ketones and other polar solvents, outperforming latex, natural rubber, and PVC for these chemicals.