CHST ACTUAL EXAM QUESTIONS
AND CORRECT DETAILED
ANSWERS WITH RATIONALES
(VERIFIED ANSWERS) ALREADY
GRADED A+ NEWEST VERSION
Which of the following is considered to be only an internal radiation hazard?
A) Alpha
B) Beta
C) Gamma or X-Ray
D) Neutron - We selected answer A because:
Alpha radiation is non-penetrating and is not considered an external hazard because of
the protection provided by the outer layer of skin. Note - in this instance the eyes are
considered an internal exposure.
If variations in noise levels are occurring at a rate more often than once per second, the
noise is considered under OSHA's noise standard.
A) Impulse
B) Impact
C) Continuous
D) A and B above - We selected answer C because:
If the occurrence of the sound is greater than once per second the sound is considered
to be continuous and should be measured as continuous sound. Ref. OSHA 29
CFR1910.95
Which of the following heat stress indicators is most commonly used in the Health &
Safety field?
A) Effective Temperature
B) Belding Hatch Stress Index
C) Wet Bulb Globe Thermometer Index
D) Skin Wetness - We selected answer C because:
The most commonly used heat stress index is the National Institute for Occupational
Safety and Health (NIOSH) Wet Bulb Globe Thermometer Index (WBGT).
,Calculate the WBGT index from the following information. Outdoor globe temperature of
98°F, wet-bulb temperature of 90°F, dry-bulb temperature 94°F.
A) 92°F
B) 94°F
C) 96°F
D) 1.1 - We selected answer A because:
WBGT = 0.7 WB + 0.2 GT + 0.1 DB WBGT = (0.7 x 90) + (0.2 x 98) + (0.1 x 94)
WBGT = 63 + 19.6 + 9.4 WBGT = 92° F
Calculate the WBGT index from the following information. Indoor globe temperature of
91°F, wet-bulb temperature of 87°F.
A) 92°F
B) 88°F
C) 86°F
D) 91°F - We selected answer B because:
WBGT = 0.7 WB + 0.3 GT WBGT = (0.7 x 87) + (0.3 x 91)
WBGT — 60.9 + 27.3
WBGT = 88.2° F
What characterizes a Class II, Division 2 location (according to the National Electrical
Code)?
A) A location where flammable or combustible vapors may be present in sufficient
quantities to be hazardous
B) A location where combustible dust is normally present in sufficient quantities to be
hazardous
C) A location where flammable or combustible vapors are not normally present, but
might be due to abnormal or periodic operations
D) A location where combustible dust is not normally present but might be due to
abnormal or periodic operations - We selected answer D because:
Class II, Division 2 locations are those in which combustible dust is not normally present
but might be due to abnormal or periodic operations. During those times, sufficient dust
may be present in the air to produce explosive or ignitable mixtures. A Class II, Division
2 location is an area normally free of dust, but due to some incident, dust may be
introduced. Mechanical breakdown of a valve or a break in a pipe are examples of
conditions that would require an area to be classified as Division 2.
Lift trucks and manufacturing and information technology equipment are potential
ignition sources that could cause a dust explosion or deflagration. What should SH&E
professionals consider when evaluating ignition sources?
A) Electrical machines
B) Dust producing processes
C) Class IV forklifts
D) Several ignition sources - we selected answer D because:
,Several ignition sources can cause a dust explosion or deflagration. Primary sources of
ignition include electrical; sparking from tramp metals or broken equipment pieces; heat
from bearings, belts and misaligned buckets; improperly prepared maintenance and hot
work operations; forklifts and vehicles; and natural causes, such as lightning. One of the
first considerations is to identify the electrical classification of the area or room volume.
NFPA70, the National Electrical Code (NEC), Chapter 5, Special Occupancies,
addresses hazardous locations. It defines the classification of several special
occupancies, such as flammable liquids, gases and vapors; combustible dusts; and
other materials. It is meant to integrate with other NFPA standards that more fully
address the particular occupancy. For electrical issues, the NEC defines what electrical
devices are permitted in a given area. The definitions located in section 500.2 are
important to know when addressing special occupancies. This section defines terms
such as dust ignition-proof, dusttight, and purged and pressurized.
During a forklift operation at your site you observe the back of a rough terrain forklift tip
as a heavy load is being lifted. Which of the following is the proper course of action?
A) Add extra counter weight to stabilize the operation
B) Do not continue with this lift
C) Add air to the load side tires
D) Tip the mast back once the load is lifted - We selected answer B because:
A forktruck should never be operated with an overload. This condition removes weight
from the steering wheels, which affects the control of the machine. Never add
counterweight because it can seriously overload the forks, tires, axles, chains etc.
Personal protective equipment is very important during welding and cutting operations.
Which of the following statements is most correct concerning the proper shade of filter
lens to use during welding and cutting operations?
a. generally it is best to pick up a #2 lens (dark) and work up, this allows compensation
for individual differences.
b. heavy gas cutting would require a number 6 to 8 shade lens
c. heavy gas cutting would require a number 14 to 16 shade lens
d. as a rule of thumb, it is generally best to start with a lens that gives a clear view of the
weld zone and then move up. - We selected answer B because:
Proper eye protection is among the most important safety precautions welders and
metal cutters can take. The proper shade protection is very important to guard against
the damage caused by UV and IR radiation created during these operations. The table
shown here was taken directly from the OSHA standards. Additional information is
contained in ANSFASC Z49.1-88.
Which of the following fire fighting agents has proven to be the most effective in
combating Class B fires?
A) Foam, CO2. Dry Powder
B) AFFF, Halon, Dry Chemical
, C) Halon, Water, Dry Chemical
D) Foam, CO2. Dry Chemical - We selected answer D because:
the most effective agents for Class B fires involving flammable liquids are Foam, CO2.
and Dry Chemical.
Complete the following statement. A bench grinder should have the tool rest adjusted to
within inch of the wheel, and the tongue guard should be adjusted to within inch of the
wheel.
A) 1/2 inch - 1/2 inch
B) 1/4 inch - 1/8 inch
C) 1/8 inch'- 1/4 inch
D) 1/16 inch - 1/4 inch - We selected answer C because:
According to the National Safety Council's "Accident Prevention Manual for Industrial
Operations." Tool rests should be adjusted to not more than 1/8
inch from the grinding wheel, tongue
guards should be adjusted to 1/4 inch.
According to the OSHA standards, which of the following statements is most correct
concerning the use of power-operated tools in a construction environment?
A) Powder-actuated tools must be tested for defects in accordance with manufacturer's
recommendations weekly, the test must be recorded and available for inspection
B) Airless spray guns above 100 psi must be equipped with a manual safety for
operator safety
C) Compressed air must be reduced to 30 psi for concrete form cleaning
D) Compressed air hoses with a one half inch inside diameter or greater must have a
safety device at the source of supply air to reduce pressure in the event of hose failure -
We selected answer D because:
Selection "A" is incorrect because OSHA requires powder-actuated tools to be
inspected each day before loading (1926.302). Selection "B" should read 1000 psi to be
accurate. Selection "C" is not correct because OSHA exempts concrete form cleaning
from the 30 psi limitation.
The following code is found on your safety shoes, what does the "FI/75" indicate?
ANSI Z41 PT 91 FF75 C/75 MT/75 Cd 1 EH
PR
A) female with an impact rating of 75 ft-lbs
B) fire resistant with an impact rating of 75 ft-lbs
C) flame proof with an impact rating of 75 ft-lbs
D) size in metrics - We selected answer A because:
The protective identification ANSI code will be legible (printed, stitched, etc.) on one
shoe of each pair. The following is an example of an ANSI code on a piece of protective
footwear:
ANSI Z41 PT 91 FI/75 C/75 MT/75 Cd 1 EH
