Exam (elaborations)
CHST EXAM QUESTIONS AND ANSWERS
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CHST EXAM QUESTIONS AND ANSWERS
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CHST EXAM ]The displacement of the atmosphere in a permit-required confined space by a non-
combustible gas to such an extent that the resulting atmosphere is non-combustible
is called:
1)Inerting.
2)Stabilizing.
3)Venting.
4)Forced gas venting. - ANSWER 1)Inerting.
Drivers of any size vehicle which transports hazardous materials that require
placarding must pass the pre-trip skills and written test to obtain a:
1) Class I license.
2) Class II license.
3) CDL.
4) 1 or 2 above - ANSWER 3) CDL.
A truck driver transporting hazardous material must know which of the following?
1) Rest stops
2) Emergency Fist Aid
3) Nature of cargo
4) CPR - ANSWER 3) Nature of cargo
Common job risk factors for the development of Cumulative Trauma Disorder (CTD)
include all of the following EXCEPT:
1) Excessive force
2) Abnormal postures
3) Mechanical compression
4) Repetition - ANSWER 4) Repetition
The definition of tensile strength on an object or of a material is:
1) The force which distorts it from its original shape.
2) The breaking strength when exposed to tensile force.
3) 1/4 of the sheer strength.
4) The sheer strength cubed. - ANSWER 2) The breaking strength when exposed to
tensile force.
Which part of the body is the main one involved in maintaining the body's heat
balance?
1) Lungs
2) Heart
3) Skin
4) Hair - ANSWER 3) Skin
Acetylene can be described as:
1) Colorless gas with slight garlic-like odor.
2) Pungent, irritating greenish-yellow gas.
3) Faint yellow liquid.
,4) White powder, chlorine-like odor. - ANSWER 1) Colorless gas with slight garlic-
like odor.
An instrument that detects a mixture of flammable vapors when air is passed over a
heated electric filament is called:
1) Wheatstone bridge.
2) Resistance bridge.
3) Combustible gas indicator.
4) Gas detector. - ANSWER 3) Combustible gas indicator.
If water weighs 8.34 lb/gal, what work is required to move 300 gallons of water from
a 400 ft. deep mine?
1) 1,000,200 ft-lbs
2) 1,000,400 ft-lbs
3) 1,000,600 ft-lbs
4) 1,000,800 ft-lbs - ANSWER 4) 1,000,800 ft-lbs
Use the formula:
W=F*D
Where:
W = Work, F = Force, D = Distance
W = (8.34 * 300)(400) = 1,000,800 ft-lbs.
At a distance of 5 miles, an office building has an angle of elevation of 2°. Find the
height of the building.
1) 922 ft
2) 561 ft
3) 434 ft
4) 4,340 ft - ANSWER 1) 922 ft
Use the formula for Tangent:
Tan 2 = Opp / Adj
Tan 2 = x / 26400
x = Tan 2 * 26400
x = 922
How long is a stay wire of a smokestack if at a distance of 80 feet from the base it
makes an angle of 65° with the ground?
1) 163
2) 16.3
3) 18.9
4) 189 - ANSWER 4) 189
Use the Cosine Law formula:
Cos 65° = Adj / Hyp
Cos 65° = 80 / x
x = 80 / .4226 x = 189.3 ft
,Which group of specially trained employees, who have been delegated by their
employer, are most qualified to respond to an emergency in which a drum of
hazardous substance has been ruptured?
1) Paramedics
2) Nurses
3) HAZMAT team
4) First aid team - ANSWER 3) HAZMAT team
If a SCBA is worn in an atmosphere that is immediately dangerous to life and health,
the employee must:
1) Wear a safety harness and lifeline.
2) Have a standby worker with a canister respirator.
3) Have an escape pack.
4) Not go into the area. - ANSWER 1) Wear a safety harness and lifeline.
What precaution should be taken during an electrical storm?
1) Stand by a tall tree.
2) Stand by a metal fence.
3) Seek shelter within a grounded metal building.
4) Seek shelter within a non-grounded non-metal building. - ANSWER 3) Seek
shelter within a grounded metal building.
Accidental contact with 60 hertz current of 5 to 25 milliamperes can cause which of
the following?
1) Death in most adults
2) Ventricular fibrillation
3) Harmless exposure
4) Paralysis - ANSWER 4) Paralysis
The major cause of fire-related deaths is attributed to:
1) Inhalation of smoke.
2) Seared lungs.
3) Carbon Monoxide.
4) Burn trauma. - ANSWER 3) Carbon Monoxide.
In the theory of fire extinguishment, all of the following are believed appropriate,
EXCEPT:
1) Extinguishment by cooling
2) Extinguishment by oxygen dilution
3) Extinguishment by fuel removal
4) Extinguishment by fire break - ANSWER 4) Extinguishment by fire break
What is the most critical period in Crisis Management?
1) First 24 hours
2) First week
3) First month
4) First year - ANSWER 1) First 24 hours
What type of emergencies would you expect to find at a TSD site?
1) Those involving hazardous substances
, 2) Those involving trash or rubbish
3) Those dealing with fire and similar life threatening conditions
4) Those involving gas cylinders - ANSWER 1) Those involving hazardous
substances
A command post established for managing a hazardous chemical spill should
contain at a minimum all of the following EXCEPT:
1) Two radios
2) Spill clean-up equipment
3) Phone
4) Facility MSDS's - ANSWER 2) Spill clean-up equipment
Of the following, which is most important in responding to a toluene spill?
1) Turn off all electrical equipment in the area.
2) Stop the leak.
3) Contain the spill.
4) Establish the hot zone and call the spill team. - ANSWER 1) Turn off all electrical
equipment in the area.
In the case of short term spills, in-place protection is used when?
1) Evacuating the public would cause lesser risks
2) Evacuating the public would cause greater risks
3) Is not recommended
4) Is not feasible of short term spills - ANSWER 2) Evacuating the public would
cause greater risks
The National Response Center (NRC) is operated by which of the following?
1) DOE
2) USCG
3) OSHA
4) SARA III - ANSWER 2) USCG
Any foreseeable act that places a rescuer in the same danger as an injured person
the rescuer is attempting to aid is considered negligence by the person who
committed the initial act. This principle is called:
1) Foreseeability.
2) Foreseeabililty applied to rescue.
3) Foreseeable for safety.
4) Inherent danger. - ANSWER 2) Foreseeabililty applied to rescue.
In the late 1980s and early 1990s, which vaccine was identified as important for
personnel at risk of exposure to bloodborne pathogens?
1) Tetanus
2) HIV
3) HBV
4) HAV - ANSWER 3) HBV
OSHA has developed a standard for Emergency Action Plans (29 CFR 1910.38) for
protection of employees during emergencies and Hazardous Waste Operations,
Emergency Response (29 CFR 1910.120) for responding to and addressing
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