CHST Study Guide Questions with
All Correct Answers Latest 2024-
2025 Update
What elements on the periodic table belongs in the halogen group? - Answer ✔ F-
Fluorine, Cl-Chlorine, Br-Bromine, I-Iodine
During the planning stages of a Construction Health & Safety Training Program which of
the following is the most important consideration? - Answer ✔ Training Objectives
Training on Industrial Hygiene sampling practice often includes the use of various
detector tubes. What is the largest source of error when using colorimetric sampling
devices? - Answer ✔ Interference from other contaminants
Is exchanging colorimetric tubes from different manufacturers allowed? - Answer ✔ No
What is MSHA? - Answer ✔ Mine Safety and Health Administration
According to the MSHA, Every new underground miner shall receive no less than _____
hours of _______________ training. - Answer ✔ 40, prescribed
Many safety management training classes provide detailed instruction on the
establishment of safety and health committees. What would not be considered a duty of
a central safety committee? - Answer ✔ Approved purchase requests for safety
equipment
Many safety management training classes provide detailed instruction on the
establishment of safety and health committees. What would be considered a duties of a
central safety committee? - Answer ✔ Review design of new plant equipment,
investigate hazardous conditions, and guide and direct safety efforts
What compound is usually found in transformers, capacitors, and fluorescent light
ballasts? - Answer ✔ Polychlorinated Biphyenyl (PCBs)
Level A is the highest level of PPE in a hazardous condition, what does it consist of? -
Answer ✔ Fully-encapsualting and chemical resistance, and SCBA
,Level D is the lowest level of PPE in a hazardous condition, what does it consist of? -
Answer ✔ Overalls, safety boots, safety glasses or goggles, and no respiratory
protection required
According to ANSI Z89.1-1997 specifications for helmets (hardhats) to protect
employees from impact of falling objects and from high voltage electrical shock. Which
Class is rated for high voltage protection? - Answer ✔ Class E (Electrical)
According to ANSI Z89.1-1997 specifications for helmets (hardhats) to protect
employees from impact of falling objects and from high voltage electrical shock. Which
Class is rated for low voltage protection? - Answer ✔ Class G (General)
According to ANSI Z89.1-1997 specifications for helmets (hardhats) to protect
employees from impact of falling objects and from high voltage electrical shock. Which
Class is rated for no voltage protection? - Answer ✔ Class C (Conductive)
What is used to drop on a hardhat during a test? - Answer ✔ 2.2 lbs pointed steel
penetrator, with 60 degrees, dropped from a simulated free-fall of height of 8 feet
What does Halon 1301 consist of? - Answer ✔ 1 Carbon, 3 Fluorine, No Chlorine, and 1
Bromine
According to OSHA at what depth must a trench be shored or cut to the angle of
repose? - Answer ✔ 5 Feet or more
What regulation requires you to have a ladder, in an excavation that are 4 feet or more,
no more than 25 feet of lateral travel for workers? - Answer ✔ 1926.651
SCBA used as emergency or rescue equipment must be inspected on what frequency?
- Answer ✔ Monthly
The body temperature rises rapidly, hot dry-skin, severe headache, visual disturbances,
rapid temperature rise, and loss of consciousness. These are symptoms of what? -
Answer ✔ Heatstroke
What radiation is considered a external hazard, but can be internal if exposed to the
eye? - Answer ✔ Alpha Radiation
According to OSHA 1910.95, if variation in noise levels are occurring at a rate more
often than once per second, the noise is considered ____________. - Answer ✔
Continuous
What is the formula for WBGT? - Answer ✔ 0.7(WB) + 0.2(GT) + 0.1(DB)
,What is the formula for WBGT for indoor settings? - Answer ✔ 0.7(WB) + 0.3(GT)
According to OSHA what is the definition of a Competent Person? - Answer ✔ The
Person who is capable of identifying existing and predictable hazards in the
surroundings or working conditions which is unsanitary, hazardous, or dangerous to
employees, and who has authorization to take prompt corrective measures to eliminate
them.
According to 1926.502(b), the guardrail systems shall be how tall from walking working
surfaces? - Answer ✔ 42", plus or minus 3"
According to 1926.502(b), how far shall intermediate members such as balusters be
apart? - Answer ✔ No more than 19" (48cm)
According to 1926.502(b), how much force shall guardrail withstand? - Answer ✔ 200lbs
(890N)
What is the primary reason for accident investigation? - Answer ✔ To determine the
facts surrounding the event
A beam that is safely loaded with a concentrated weight of 4000lbs will be able to carry
how much weight equally distributed the entire length of the beam? - Answer ✔ 8000lbs,
a beam that is safety loaded can carry up to two times its weight
What is the safety range for oxygen? - Answer ✔ 21.5%-19.5%
According to ANSI/ASC Z49.1, How long should fire watch stay back? - Answer ✔ 30
Minutes
What is OSHA 1910.147? - Answer ✔ Energy Control Program
A 1000 pound load is lifted with a 2-leg bridle sling whose legs are at a 30 deg angle
with the load. The stress on each leg of the sling is: - Answer ✔ SIN A = a/c, a=1000/2
SIN A = 500/SIN30 = 1000
In welding what does GTAW means? - Answer ✔ Gas Tungsten Arc-Welding
Sound pressure levels are measured in? - Answer ✔ Microbars or 1 Dyne/cm square
What is required for most rubber gloves, while working on high voltage conductors? -
Answer ✔ Leather Outer Glove
, When placing a ladder, the base of the ladder should be placed away from the building
approximately _______ of the vertical distance from the ground to the point of contact
with the wall. - Answer ✔ 1/4
Direct reading instruments can be very useful, because it can detect just about every
chemical you can encounter. What is the one common aliment do these instrument
encounter? - Answer ✔ Interference by other contaminants
According to NFPA 30 and 321, Basic Classification of Flammable and Combustible
Liquid, What class has no boiling point but has a flash point below 100 F? - Answer ✔
Class I
According to NFPA 30 and 321, Basic Classification of Flammable and Combustible
Liquid, What class has a boiling point below 100 F but has a flash point below 73 F? -
Answer ✔ Class IA
According to NFPA 30 and 321, Basic Classification of Flammable and Combustible
Liquid, What class has a boiling point at or above 100 F but has a flash point below 73
F? - Answer ✔ Class IB
According to NFPA 30 and 321, Basic Classification of Flammable and Combustible
Liquid, What class has no boiling point but has a flash point at or above 73 F below 100
F? - Answer ✔ Class IC
According to NFPA 30 and 321, Basic Classification of Flammable and Combustible
Liquid, What class has no boiling point but has a flash point at or above 100 F and
below 140F? - Answer ✔ Class II
According to NFPA 30 and 321, Basic Classification of Flammable and Combustible
Liquid, What class has no boiling point but has a flash point at or above 140F? - Answer
✔ Class III
According to NFPA 30 and 321, Basic Classification of Flammable and Combustible
Liquid, What class has no boiling point but has a flash point at or above 140F and below
200? - Answer ✔ Class IIIA
According to NFPA 30 and 321, Basic Classification of Flammable and Combustible
Liquid, What class has no boiling point but has a flash point at or above 200 F? -
Answer ✔ Class IIIB
A CHST is involved in a monitoring operation within an equipment repair area and is
using a CO direct reading instrument. It has been reading 35 ppm for 4 hours, suddenly
without any changes in condition in the general area. Then the reading increases to 65
ppm for 5 minutes, whats your next step? - Answer ✔ Stop and re-calibrate instrument
